Nos publications
Isaac, Carole; Confalonieri, Giorgia; Nouali, Habiba; Paillaud, Jean-Louis; Arletti, Rossella; Daou, Jean T; Ryzhikov, Andrey Unusual high-pressure intrusion-extrusion behavior of electrolyte solutions in Mu-26, a pure silica zeolite of topology STF Article de journal Microporous and Mesoporous Materials, 298 , p. 110047, 2020. @article{Isaac2020, title = {Unusual high-pressure intrusion-extrusion behavior of electrolyte solutions in Mu-26, a pure silica zeolite of topology STF}, author = { Carole Isaac and Giorgia Confalonieri and Habiba Nouali and Jean-Louis Paillaud and Rossella Arletti and T. Jean Daou and Andrey Ryzhikov}, doi = {10.1016/j.micromeso.2020.110047}, year = {2020}, date = {2020-05-01}, journal = {Microporous and Mesoporous Materials}, volume = {298}, pages = {110047}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Platek, Anetta; Nita, Cristina; Ghimbeu, Camelia Matei; Frackowiak, Elzbieta; Fic, Krzysztof Electrochemical capacitors operating in aqueous electrolyte with volumetric characteristics improved by sustainable templating of electrode materials Article de journal Electrochimica Acta, 338 , p. 135788, 2020. @article{Platek2020, title = {Electrochemical capacitors operating in aqueous electrolyte with volumetric characteristics improved by sustainable templating of electrode materials}, author = { Anetta Platek and Cristina Nita and Camelia Matei Ghimbeu and Elzbieta Frackowiak and Krzysztof Fic}, doi = {10.1016/j.electacta.2020.135788}, year = {2020}, date = {2020-04-01}, journal = {Electrochimica Acta}, volume = {338}, pages = {135788}, abstract = {Soft- and salt-templating methods have been combined to obtain highly microporous carbon materials with mesopores in the narrow pore size range. Phenolic resin was used as a carbon source, and rubidium and caesium chloride were used as salt-templates, giving a well-developed microporosity with a high specific surface area, whereas a sacrificial triblock polymer Pluronic F-127 (soft-template) induced the mesopores of essential importance for fast access of the electrode surface area for the electrolytic solution. The combination of a high specific surface area (up to 2556 m(2) g(-1)) with a suitable pore size (0.77-0.88 nm) resulted in an excellent performance of the electrochemical capacitor. High specific energies of 16.7 Wh.kg(-1) at 300 W kg(-1) of specific power have been achieved for a CsCl-T-based high-voltage (1.5 V) device with a 0.5 mol.L-1 Li2SO4 electrolytic solution. The improved rate handling was allowed to maintain 10 Wh.kg(-1) of specific energy at 4 kW kg(-1) of specific power. In contrast to the other carbons with well-developed porosities, the material density obtained allowed our device to reach competitive, remarkably higher volumetric characteristics. (C) 2020 The Authors. Published by Elsevier Ltd.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Soft- and salt-templating methods have been combined to obtain highly microporous carbon materials with mesopores in the narrow pore size range. Phenolic resin was used as a carbon source, and rubidium and caesium chloride were used as salt-templates, giving a well-developed microporosity with a high specific surface area, whereas a sacrificial triblock polymer Pluronic F-127 (soft-template) induced the mesopores of essential importance for fast access of the electrode surface area for the electrolytic solution. The combination of a high specific surface area (up to 2556 m(2) g(-1)) with a suitable pore size (0.77-0.88 nm) resulted in an excellent performance of the electrochemical capacitor. High specific energies of 16.7 Wh.kg(-1) at 300 W kg(-1) of specific power have been achieved for a CsCl-T-based high-voltage (1.5 V) device with a 0.5 mol.L-1 Li2SO4 electrolytic solution. The improved rate handling was allowed to maintain 10 Wh.kg(-1) of specific energy at 4 kW kg(-1) of specific power. In contrast to the other carbons with well-developed porosities, the material density obtained allowed our device to reach competitive, remarkably higher volumetric characteristics. (C) 2020 The Authors. Published by Elsevier Ltd. |
Dietlin, Celine; Trinh, Thanh Tam; Schweizer, Stephane; Graff, Bernadette; Morlet-Savary, Fabrice; Noirot, Pierre-Antoine; Lalevee, Jacques New Phosphine Oxides as High Performance Near- UV Type I Photoinitiators of Radical Polymerization. Article de journal Molecules (Basel, Switzerland), 25 (7), 2020. @article{Dietlin2020, title = {New Phosphine Oxides as High Performance Near- UV Type I Photoinitiators of Radical Polymerization.}, author = { Celine Dietlin and Thanh Tam Trinh and Stephane Schweizer and Bernadette Graff and Fabrice Morlet-Savary and Pierre-Antoine Noirot and Jacques Lalevee}, doi = {10.3390/molecules25071671}, year = {2020}, date = {2020-04-01}, journal = {Molecules (Basel, Switzerland)}, volume = {25}, number = {7}, abstract = {Carbazole structures are of high interest in photopolymerization due to their enhanced light absorption properties in the near-UV or even visible ranges. Therefore, type I photoinitiators combining the carbazole chromophore to the well-established phosphine-oxides were proposed and studied in this article. The aim of this article was to propose type I photoinitiators that can be more reactive than benchmark phosphine oxides, which are among the more reactive type I photoinitiators for a UV or near-UV light emitting diodes (LED) irradiation. Two molecules were synthesized and their UV-visible light absorption properties as well as the quantum yields of photolysis and photopolymerization performances were measured. Remarkably, the associated absorption was enhanced in the 350-410 nm range compared to benchmark phosphine oxides, and one compound was found to be more reactive in photopolymerization than the commercial photoinitiator TPO-L for an irradiation at 395 nm.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Carbazole structures are of high interest in photopolymerization due to their enhanced light absorption properties in the near-UV or even visible ranges. Therefore, type I photoinitiators combining the carbazole chromophore to the well-established phosphine-oxides were proposed and studied in this article. The aim of this article was to propose type I photoinitiators that can be more reactive than benchmark phosphine oxides, which are among the more reactive type I photoinitiators for a UV or near-UV light emitting diodes (LED) irradiation. Two molecules were synthesized and their UV-visible light absorption properties as well as the quantum yields of photolysis and photopolymerization performances were measured. Remarkably, the associated absorption was enhanced in the 350-410 nm range compared to benchmark phosphine oxides, and one compound was found to be more reactive in photopolymerization than the commercial photoinitiator TPO-L for an irradiation at 395 nm. |
Bellanger, Xavier; Schneider, Raphael; Dezanet, Clement; Arroua, Boussad; Balan, Lavinia; Billard, Patrick; Merlin, Christophe Zn2+ leakage and photo-induced reactive oxidative species do not explain the full toxicity of ZnO core Quantum Dots. Article de journal Journal of hazardous materials, 396 , p. 122616–122616, 2020. @article{Bellanger2020, title = {Zn2+ leakage and photo-induced reactive oxidative species do not explain the full toxicity of ZnO core Quantum Dots.}, author = { Xavier Bellanger and Raphael Schneider and Clement Dezanet and Boussad Arroua and Lavinia Balan and Patrick Billard and Christophe Merlin}, doi = {10.1016/j.jhazmat.2020.122616}, year = {2020}, date = {2020-04-01}, journal = {Journal of hazardous materials}, volume = {396}, pages = {122616--122616}, abstract = {Metal oxide nanoparticles (NPs), and among them metal oxides Quantum Dots (QDs), exhibit a multifactorial toxicity combining metal leaching, oxidative stress and possibly direct deleterious interactions, the relative contribution of each varying according to the NP composition and surface chemistry. Their wide use in public and industrial domains requires a good understanding and even a good control of their toxicity. To address this question, we engineered ZnO QDs with different surface chemistries, expecting that they would exhibit different photo-induced reactivities and possibly different levels of interaction with biological materials. No photo-induced toxicity could be detected on whole bacterial cell toxicity assays, indicating that ROS-dependent damages, albeit real, are hidden behind a stronger source of toxicity, which was comforted by the fact that the different ZnO QDs displayed the same level of cell toxicity. However, using in vitro DNA damage assays based on quantitative PCR, significant photo-induced reactivity could be measured precisely, showing that different NPs exhibiting similar inhibitory effects on whole bacteria could differ dramatically in terms of ROS-generated damages on biomolecules. We propose that direct interactions between NPs and bacterial cell surfaces prime over any kind of intracellular damages to explain the ZnO QDs toxicity on whole bacterial cells.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Metal oxide nanoparticles (NPs), and among them metal oxides Quantum Dots (QDs), exhibit a multifactorial toxicity combining metal leaching, oxidative stress and possibly direct deleterious interactions, the relative contribution of each varying according to the NP composition and surface chemistry. Their wide use in public and industrial domains requires a good understanding and even a good control of their toxicity. To address this question, we engineered ZnO QDs with different surface chemistries, expecting that they would exhibit different photo-induced reactivities and possibly different levels of interaction with biological materials. No photo-induced toxicity could be detected on whole bacterial cell toxicity assays, indicating that ROS-dependent damages, albeit real, are hidden behind a stronger source of toxicity, which was comforted by the fact that the different ZnO QDs displayed the same level of cell toxicity. However, using in vitro DNA damage assays based on quantitative PCR, significant photo-induced reactivity could be measured precisely, showing that different NPs exhibiting similar inhibitory effects on whole bacteria could differ dramatically in terms of ROS-generated damages on biomolecules. We propose that direct interactions between NPs and bacterial cell surfaces prime over any kind of intracellular damages to explain the ZnO QDs toxicity on whole bacterial cells. |
Le, Cuong Minh Quoc; Schmutz, Marc; Chemtob, Abraham Ab Initio Batch Emulsion Thiol-Ene Photopolymerization Article de journal Macromolecules, 53 (7), p. 2369–2379, 2020. @article{Le2020a, title = {Ab Initio Batch Emulsion Thiol-Ene Photopolymerization}, author = { Cuong Minh Quoc Le and Marc Schmutz and Abraham Chemtob}, doi = {10.1021/acs.macromol.0c00265}, year = {2020}, date = {2020-04-01}, journal = {Macromolecules}, volume = {53}, number = {7}, pages = {2369--2379}, abstract = {Very few step polymer latexes have been produced by aqueous emulsion polymerization and never with a clear picture of the operating mechanism. Therefore, finding new means to expand this widely used process industrially beyond chain radical polymerization is highly desirable. Herein, we report the successful photo-initiated thiolene radical polyaddition of an emulsion based on two bifunctional monomers diallyl phthalate and 2,2-(ethylenedioxy)diethanedithiol. After 20 min of irradiation (lambda(max) = 385 nm, 3.7 mW cm(-2)), polymerization resulted in a conversion above 99%, a coagulum-free poly(thioether) latex with a solid content of 10 wt %, a number-average molecular weight of 14 kDa, and an average particle diameter of 60 nm. Reaction kinetics, particle size distribution, and molecular weight progress have been studied in detail. To clarify the mechanism dictating particle formation, the number of particles per unit volume of water has been determined depending on reaction time and surfactant and initiator concentration. The nucleation mode is found to depart significantly from conventional chain radical emulsion polymerization. Polymer particle formation mainly proceeds through the precipitation of oligo-radicals (homogeneous nucleation) even when the concentration of the surfactant exceeds its critical micelle concentration. The end of nucleation (interval I) occurs until a monomer conversion of about 95%. The dispersion's solid content can reach as high as 40%, and the molecular weights remain reasonable (>4 kDa) even if the functional groups are stoichiometrically imbalanced. In contrast to conventional thermally induced polymerization, temporal control is demonstrated through sequential "on"/"off' cycles, and tuning of molecular weights is achieved by precise energetic dosage of radiation. This new step photopolymerization in emulsion thus opens an avenue for the synthesis of linear polysulfide latexes without high energy homogenization and at low irradiance.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Very few step polymer latexes have been produced by aqueous emulsion polymerization and never with a clear picture of the operating mechanism. Therefore, finding new means to expand this widely used process industrially beyond chain radical polymerization is highly desirable. Herein, we report the successful photo-initiated thiolene radical polyaddition of an emulsion based on two bifunctional monomers diallyl phthalate and 2,2-(ethylenedioxy)diethanedithiol. After 20 min of irradiation (lambda(max) = 385 nm, 3.7 mW cm(-2)), polymerization resulted in a conversion above 99%, a coagulum-free poly(thioether) latex with a solid content of 10 wt %, a number-average molecular weight of 14 kDa, and an average particle diameter of 60 nm. Reaction kinetics, particle size distribution, and molecular weight progress have been studied in detail. To clarify the mechanism dictating particle formation, the number of particles per unit volume of water has been determined depending on reaction time and surfactant and initiator concentration. The nucleation mode is found to depart significantly from conventional chain radical emulsion polymerization. Polymer particle formation mainly proceeds through the precipitation of oligo-radicals (homogeneous nucleation) even when the concentration of the surfactant exceeds its critical micelle concentration. The end of nucleation (interval I) occurs until a monomer conversion of about 95%. The dispersion's solid content can reach as high as 40%, and the molecular weights remain reasonable (>4 kDa) even if the functional groups are stoichiometrically imbalanced. In contrast to conventional thermally induced polymerization, temporal control is demonstrated through sequential "on"/"off' cycles, and tuning of molecular weights is achieved by precise energetic dosage of radiation. This new step photopolymerization in emulsion thus opens an avenue for the synthesis of linear polysulfide latexes without high energy homogenization and at low irradiance. |
Montes, M L; Barraque, F; Fuentes, Bursztyn A L; Taylor, M A; Mercader, R C; Miehe-Brendle, J; Sanchez, Torres R M Effect of synthetic beidellite structural characteristics on the properties of beidellite/Fe oxides magnetic composites as Sr and Cs adsorbent materials Article de journal Materials Chemistry and Physics, 245 , p. 122760, 2020. @article{Montes2020, title = {Effect of synthetic beidellite structural characteristics on the properties of beidellite/Fe oxides magnetic composites as Sr and Cs adsorbent materials}, author = { M. L. Montes and F. Barraque and A. L. Bursztyn Fuentes and M. A. Taylor and R. C. Mercader and J. Miehe-Brendle and R. M. Torres Sanchez}, doi = {10.1016/j.matchemphys.2020.122760}, year = {2020}, date = {2020-04-01}, journal = {Materials Chemistry and Physics}, volume = {245}, pages = {122760}, abstract = {To design more efficient and versatile sorbent materials for wastewater treatment three magnetic beidellite composites with different cation exchange capacity and total specific surface area have been synthetized, characterized and used as Cs+ and Sr2+ sorbents. Total loaded Fe concentration and its distribution on the magnetic composites seems to be related to the total specific surface area. The higher saturation magnetization, 13.7 +/- 0.7 Am-2/kg, was achieved for the sample with the higher total specific surface area. The main magnetic phases after the synthesis are magnetite and maghemite, whose particle size ranged between 28 and 114 nm, respectively. The Cs+ and Sr2+ sorption capacities of raw and magnetic beidellite composites were similar. The sorption takes place at two different sorption sites of the beidellite composites: the external surface, as indicated by zeta potential changes, and the interlayer space, as revealed by diffraction patterns.}, keywords = {}, pubstate = {published}, tppubtype = {article} } To design more efficient and versatile sorbent materials for wastewater treatment three magnetic beidellite composites with different cation exchange capacity and total specific surface area have been synthetized, characterized and used as Cs+ and Sr2+ sorbents. Total loaded Fe concentration and its distribution on the magnetic composites seems to be related to the total specific surface area. The higher saturation magnetization, 13.7 +/- 0.7 Am-2/kg, was achieved for the sample with the higher total specific surface area. The main magnetic phases after the synthesis are magnetite and maghemite, whose particle size ranged between 28 and 114 nm, respectively. The Cs+ and Sr2+ sorption capacities of raw and magnetic beidellite composites were similar. The sorption takes place at two different sorption sites of the beidellite composites: the external surface, as indicated by zeta potential changes, and the interlayer space, as revealed by diffraction patterns. |
Ahmad, Nur Hidayahni; Daou, Jean T; Maireles-Torres, Pedro; Zaarour, Moussa; Mintova, Svetlana; Ling, Tau-Chuan; Ng, Eng-Poh Morphological effects on catalytic performance of LTL zeolites in acylation of 2-methylfuran enhanced by non-microwave instant heating Article de journal Materials Chemistry and Physics, 244 , p. 122688, 2020. @article{Ahmad2020, title = {Morphological effects on catalytic performance of LTL zeolites in acylation of 2-methylfuran enhanced by non-microwave instant heating}, author = { Nur Hidayahni Ahmad and T. Jean Daou and Pedro Maireles-Torres and Moussa Zaarour and Svetlana Mintova and Tau-Chuan Ling and Eng-Poh Ng}, doi = {10.1016/j.matchemphys.2020.122688}, year = {2020}, date = {2020-04-01}, journal = {Materials Chemistry and Physics}, volume = {244}, pages = {122688}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Kiener, Julien; Girleanu, Maria; Ersen, Ovidiu; Parmentier, Julien Direct Insight into the Confinement Effect of WS2 Nanostructures in an Ordered Carbon Matrix Article de journal Crystal Growth & Design, 20 (3), p. 2004–2013, 2020. @article{Kiener2020, title = {Direct Insight into the Confinement Effect of WS2 Nanostructures in an Ordered Carbon Matrix}, author = { Julien Kiener and Maria Girleanu and Ovidiu Ersen and Julien Parmentier}, doi = {10.1021/acs.cgd.9b01662}, year = {2020}, date = {2020-03-01}, journal = {Crystal Growth & Design}, volume = {20}, number = {3}, pages = {2004--2013}, abstract = {A new growth mechanism of WS2 nanostructures with well-defined shapes (nanocages or nanotubes), induced by a confinement effect in a mesoporous structure, is reported. As evidenced by high resolution electron microscopy, the growth of these peculiar structures is governed by a restructuration mechanism that occurs in an ordered mesoporous carbon matrix with a nanometric pore size via a one-pot synthesis method (soft-template process) in which W-based clusters are initially dispersed in the carbon walls. During a thermal treatment carried in an Ar/H2S gas mixture and a carbonaceous reductive atmosphere, small WS2 nanolayers stacked and shaped as nanoribbons are produced in a first step within the mesopores at 350 degrees C. In the second step, at higher sulfidation temperature, a solid/gas growth mechanism occurs in which H2S and W gaseous species (originating from the W clusters) decompose and react on initially formed WS2 nanoribbon seeds. That leads to a spatially restricted growth with the progressive formation of curved WS2 nanolayers characterized by ellipsoidal-based shapes characteristic of the inorganic fullerenes (at 550 degrees C) and finally to cylindrical shapes similar to the typical structures observed for most of inorganic nanotubes (at 750 degrees C).}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new growth mechanism of WS2 nanostructures with well-defined shapes (nanocages or nanotubes), induced by a confinement effect in a mesoporous structure, is reported. As evidenced by high resolution electron microscopy, the growth of these peculiar structures is governed by a restructuration mechanism that occurs in an ordered mesoporous carbon matrix with a nanometric pore size via a one-pot synthesis method (soft-template process) in which W-based clusters are initially dispersed in the carbon walls. During a thermal treatment carried in an Ar/H2S gas mixture and a carbonaceous reductive atmosphere, small WS2 nanolayers stacked and shaped as nanoribbons are produced in a first step within the mesopores at 350 degrees C. In the second step, at higher sulfidation temperature, a solid/gas growth mechanism occurs in which H2S and W gaseous species (originating from the W clusters) decompose and react on initially formed WS2 nanoribbon seeds. That leads to a spatially restricted growth with the progressive formation of curved WS2 nanolayers characterized by ellipsoidal-based shapes characteristic of the inorganic fullerenes (at 550 degrees C) and finally to cylindrical shapes similar to the typical structures observed for most of inorganic nanotubes (at 750 degrees C). |
Pichavant, Loic; Lacroix-Desmazes, Patrick; Chemtob, Abraham; Pinaud, Julien; Heroguez, Valerie Polynorbornene latex synthesis by UV-triggered Ring-Opening Metathesis Polymerization in miniemulsion Article de journal Polymer, 190 , p. 122200, 2020. @article{Pichavant2020, title = {Polynorbornene latex synthesis by UV-triggered Ring-Opening Metathesis Polymerization in miniemulsion}, author = { Loic Pichavant and Patrick Lacroix-Desmazes and Abraham Chemtob and Julien Pinaud and Valerie Heroguez}, doi = {10.1016/j.polymer.2020.122200}, year = {2020}, date = {2020-03-01}, journal = {Polymer}, volume = {190}, pages = {122200}, abstract = {An innovative route based on a novel photo-latent ROMP initiator has been explored to synthesize polynorbornene latex particles in miniemulsion. Operation conditions were strongly improved by the use of an annular LED photo-reactor, increasing the uniformity of radiation distribution and enabling to control atmosphere and stirring throughout irradiation. Several parameters (droplet size, irradiance, pre-catalyst structure) were studied in order to improve the monomer conversion profiles, which eventually led to the production of latex with high norbornene conversion (>90%) and 10% solids content. Particular attention was paid to the polymer microstructure, which was found to be highly dependent on the type of initiation mechanism.}, keywords = {}, pubstate = {published}, tppubtype = {article} } An innovative route based on a novel photo-latent ROMP initiator has been explored to synthesize polynorbornene latex particles in miniemulsion. Operation conditions were strongly improved by the use of an annular LED photo-reactor, increasing the uniformity of radiation distribution and enabling to control atmosphere and stirring throughout irradiation. Several parameters (droplet size, irradiance, pre-catalyst structure) were studied in order to improve the monomer conversion profiles, which eventually led to the production of latex with high norbornene conversion (>90%) and 10% solids content. Particular attention was paid to the polymer microstructure, which was found to be highly dependent on the type of initiation mechanism. |
Aloulou, Wala; Aloulou, Hajer; Jadda, Amane; Chakraborty, Sudip; Amar, Raja Ben Euro-mediterranean Journal for Environmental Integration, 5 (1), p. 10, 2020. @article{Aloulou2020, title = {Characterization of an asymmetric ultrafiltration membrane prepared from TiO2-smectite nanocomposites doped with commercial TiO2 and its application to the treatment of textile wastewater}, author = { Wala Aloulou and Hajer Aloulou and Amane Jadda and Sudip Chakraborty and Raja Ben Amar}, doi = {10.1007/s41207-020-0145-6}, year = {2020}, date = {2020-03-01}, journal = {Euro-mediterranean Journal for Environmental Integration}, volume = {5}, number = {1}, pages = {10}, abstract = {Inexpensive ultrafiltration ceramic membranes were prepared using three nanoparticle powders created by mixing synthetic TiO2-smectite nanocomposites with commercial TiO2 in various ratios: 95:5 (generating type 1 nanoparticle powder, "NP1"), 85:15 (type 2 nanoparticle powder, "NP2"), and 70:30 (type 3 nanoparticle powder, "NP3"). For each membrane, the active layer that performed the ultrafiltration was deposited on a previously prepared silty marl support ("M") in a layer-by-layer approach using a suspension of the nanoparticles in polyvinyl alcohol solution (PVA) and water. The morphologies and properties of the membranes obtained after sintering at 950 degrees C for 3 h were characterized by BET and SEM. It was observed that the active layers of the three membranes (NP1/M, NP2/M, and NP3/M) were homogeneously structured, exhibited no cracks, and had average pore diameters of 22.5 nm, 16 nm, and 5 nm, respectively. Water permeabilities ranged from 2100 L h(-1) m(-2) bar for the support before layer deposition to 181 L h(-1) m(-2) bar for the NP3/M membrane, which indicates that the latter membrane can be used for ultrafiltration. The performance of the NP3/M membrane was then investigated by studying pure water permeation through the membrane and by using NP3/M to filter pretreated and nonpretreated textile wastewaters. The results showed that ultrafiltration through NP3/M led to significant decreases in the turbidity, color, and chemical oxygen demand (COD) of the wastewaters, while the permeate flux was maintained at an acceptable level. Thus, the NP3/M ultrafiltration membrane developed in this work could be used for the remediation of industrial effluents.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Inexpensive ultrafiltration ceramic membranes were prepared using three nanoparticle powders created by mixing synthetic TiO2-smectite nanocomposites with commercial TiO2 in various ratios: 95:5 (generating type 1 nanoparticle powder, "NP1"), 85:15 (type 2 nanoparticle powder, "NP2"), and 70:30 (type 3 nanoparticle powder, "NP3"). For each membrane, the active layer that performed the ultrafiltration was deposited on a previously prepared silty marl support ("M") in a layer-by-layer approach using a suspension of the nanoparticles in polyvinyl alcohol solution (PVA) and water. The morphologies and properties of the membranes obtained after sintering at 950 degrees C for 3 h were characterized by BET and SEM. It was observed that the active layers of the three membranes (NP1/M, NP2/M, and NP3/M) were homogeneously structured, exhibited no cracks, and had average pore diameters of 22.5 nm, 16 nm, and 5 nm, respectively. Water permeabilities ranged from 2100 L h(-1) m(-2) bar for the support before layer deposition to 181 L h(-1) m(-2) bar for the NP3/M membrane, which indicates that the latter membrane can be used for ultrafiltration. The performance of the NP3/M membrane was then investigated by studying pure water permeation through the membrane and by using NP3/M to filter pretreated and nonpretreated textile wastewaters. The results showed that ultrafiltration through NP3/M led to significant decreases in the turbidity, color, and chemical oxygen demand (COD) of the wastewaters, while the permeate flux was maintained at an acceptable level. Thus, the NP3/M ultrafiltration membrane developed in this work could be used for the remediation of industrial effluents. |
Wang, Dengxia; Arar, Ahmad; Garra, Patxi; Graff, Bernadette; Lalevee, Jacques Charge Transfer Complexes based on Various Amines as Dual Thermal and Photochemical Polymerization Initiators: A Powerful Tool for the Access to Composites Article de journal Journal of Polymer Science, 58 (6), p. 811–823, 2020. @article{Wang2020b, title = {Charge Transfer Complexes based on Various Amines as Dual Thermal and Photochemical Polymerization Initiators: A Powerful Tool for the Access to Composites}, author = { Dengxia Wang and Ahmad Arar and Patxi Garra and Bernadette Graff and Jacques Lalevee}, doi = {10.1002/pol.20190248}, year = {2020}, date = {2020-03-01}, journal = {Journal of Polymer Science}, volume = {58}, number = {6}, pages = {811--823}, abstract = {Exploiting highly efficient, environmentally friendly, and economic CTCs (Charger Transfer Complexes) as photo/thermal dual initiators is a huge pursuit of materials practitioners and innovators. To investigate and find out series amines as donors in CTCs, RT-FTIR (Real-Time Fourier Transform Infrared Spectroscopy) was employed to examine the photo initiating efficiency of CTCs based on amines donors and DSC (Differential Scanning Calorimeter) was used to test their thermal initiating ability. The formation of CTCs was investigated and confirmed by molecular orbital (MO) calculations and UV-Vis experimental study. Structure/reactivity/efficiency relationships will be proposed on the base of more than 10 new amine donors. At last, composites based on glass fibers and carbon fibers were fabricated by photo curing and/or photo/thermal dual curing method, which showed excellent mechanical performance in DMA (Dynamic Mechanical Analysis) characterization. This work paves the path toward flexible photo/thermal dual initiators able to react on demand thanks to orthogonal stimuli (light or heat with the same initiating system). It will naturally find use in time and spatially resolved composites manufacturing (were classical simple photoinitiating or thermal systems are inefficient). (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 811-823}, keywords = {}, pubstate = {published}, tppubtype = {article} } Exploiting highly efficient, environmentally friendly, and economic CTCs (Charger Transfer Complexes) as photo/thermal dual initiators is a huge pursuit of materials practitioners and innovators. To investigate and find out series amines as donors in CTCs, RT-FTIR (Real-Time Fourier Transform Infrared Spectroscopy) was employed to examine the photo initiating efficiency of CTCs based on amines donors and DSC (Differential Scanning Calorimeter) was used to test their thermal initiating ability. The formation of CTCs was investigated and confirmed by molecular orbital (MO) calculations and UV-Vis experimental study. Structure/reactivity/efficiency relationships will be proposed on the base of more than 10 new amine donors. At last, composites based on glass fibers and carbon fibers were fabricated by photo curing and/or photo/thermal dual curing method, which showed excellent mechanical performance in DMA (Dynamic Mechanical Analysis) characterization. This work paves the path toward flexible photo/thermal dual initiators able to react on demand thanks to orthogonal stimuli (light or heat with the same initiating system). It will naturally find use in time and spatially resolved composites manufacturing (were classical simple photoinitiating or thermal systems are inefficient). (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 811-823 |
Beda, Adrian; Villevieille, Claire; Taberna, Pierre-Louis; Simon, Patrice; Ghimbeu, Camelia Matei Self-supported binder-free hard carbon electrodes for sodium-ion batteries: insights into their sodium storage mechanisms Article de journal Journal of Materials Chemistry A, 8 (11), p. 5558–5571, 2020. @article{Beda2020, title = {Self-supported binder-free hard carbon electrodes for sodium-ion batteries: insights into their sodium storage mechanisms}, author = { Adrian Beda and Claire Villevieille and Pierre-Louis Taberna and Patrice Simon and Camelia Matei Ghimbeu}, doi = {10.1039/c9ta13189b}, year = {2020}, date = {2020-03-01}, journal = {Journal of Materials Chemistry A}, volume = {8}, number = {11}, pages = {5558--5571}, abstract = {Hard carbons are some of the most promising negative electrode materials for sodium-ion batteries (NIBs). In contrast to most of the published studies employing powder-like electrodes containing binders, additives and solvents, we report herein an innovative way to prepare binder-free electrodes by simple impregnation of cellulose and cotton filter papers with a phenolic resin solution. The latter enables improvement of the poor mechanical properties and thermal stability observed for pristine hard carbon self-standing electrodes (SSEs) along with the carbon yield. A high reversible specific capacity and long-term stability were observed for cellulose compared to those of cotton-based SSEs in NIBs, i.e., 240 mA h g(-1)vs. 140 mA h g(-1), respectively, for a C/10 rate and high mass loading (similar to 5.2 mg cm(-2)). This could be ascribed to the larger number of defects on cellulose than on cotton as quantified by temperature programmed desorption coupled with mass-spectrometry (TPD-MS), the structure and porosity being similar for both materials. Furthermore, the addition of a conductive sputter coating on the cellulose SSE surface improved the reversible specific capacity (to similar to 300 mA h g(-1)) and initial coulombic efficiency (ICE) (to 85%). Operando X-ray diffraction (XRD) was performed to provide additional insights into the Na storage mechanisms. Although no shift was noticed for the graphite (002) diffraction peak, clear evidence of sodium intercalation was observed in the plateau region with the appearance of a new diffraction peak (similar to 28.0 degrees 2 theta) likely associated with a sodium intercalation compound. Consequently, the sloping region could be related to the Na+ adsorption on hard carbon defects and pores.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Hard carbons are some of the most promising negative electrode materials for sodium-ion batteries (NIBs). In contrast to most of the published studies employing powder-like electrodes containing binders, additives and solvents, we report herein an innovative way to prepare binder-free electrodes by simple impregnation of cellulose and cotton filter papers with a phenolic resin solution. The latter enables improvement of the poor mechanical properties and thermal stability observed for pristine hard carbon self-standing electrodes (SSEs) along with the carbon yield. A high reversible specific capacity and long-term stability were observed for cellulose compared to those of cotton-based SSEs in NIBs, i.e., 240 mA h g(-1)vs. 140 mA h g(-1), respectively, for a C/10 rate and high mass loading (similar to 5.2 mg cm(-2)). This could be ascribed to the larger number of defects on cellulose than on cotton as quantified by temperature programmed desorption coupled with mass-spectrometry (TPD-MS), the structure and porosity being similar for both materials. Furthermore, the addition of a conductive sputter coating on the cellulose SSE surface improved the reversible specific capacity (to similar to 300 mA h g(-1)) and initial coulombic efficiency (ICE) (to 85%). Operando X-ray diffraction (XRD) was performed to provide additional insights into the Na storage mechanisms. Although no shift was noticed for the graphite (002) diffraction peak, clear evidence of sodium intercalation was observed in the plateau region with the appearance of a new diffraction peak (similar to 28.0 degrees 2 theta) likely associated with a sodium intercalation compound. Consequently, the sloping region could be related to the Na+ adsorption on hard carbon defects and pores. |
Keith, Andrew N; Vatankhah-Varnosfaderani, Mohammad; Clair, Charles; Fahimipour, Farahnaz; Dashtimoghadam, Erfan; Lallam, Abdelaziz; Sztucki, Michael; Ivanov, Dimitri A; Liang, Heyi; Dobrynin, Andrey V; Sheiko, Sergei S Bottlebrush Bridge between Soft Gels and Firm Tissues Article de journal Acs Central Science, 6 (3), p. 413–419, 2020. @article{Keith2020, title = {Bottlebrush Bridge between Soft Gels and Firm Tissues}, author = { Andrew N. Keith and Mohammad Vatankhah-Varnosfaderani and Charles Clair and Farahnaz Fahimipour and Erfan Dashtimoghadam and Abdelaziz Lallam and Michael Sztucki and Dimitri A. Ivanov and Heyi Liang and Andrey V Dobrynin and Sergei S. Sheiko}, doi = {10.1021/acscentsci.9b01216}, year = {2020}, date = {2020-03-01}, journal = {Acs Central Science}, volume = {6}, number = {3}, pages = {413--419}, abstract = {Softness and firmness are seemingly incompatible traits that synergize to create the unique soft-yet-firm tactility of living tissues pursued in soft robotics, wearable electronics, and plastic surgery. This dichotomy is particularly pronounced in tissues such as fat that are known to be both ultrasoft and ultrafirm. However, synthetically replicating this mechanical response remains elusive since ubiquitously employed soft gels are unable to concurrently reproduce tissue firmness. We have addressed the tissue challenge through the self-assembly of linear-bottlebrush-linear (LBL) block copolymers into thermoplastic elastomers. This hybrid molecular architecture delivers a hierarchical network organization with a cascade of deformation mechanisms responsible for initially low moduli followed by intense strain-stiffening. By bridging the firmness gap between gels and tissues, we have replicated the mechanics of fat, fetal membrane, spinal cord, and brain tissues. These solvent-free, nonleachable, and tissue-mimetic elastomers also show enhanced biocompatibility as demonstrated by cell proliferation studies, all of which are vital for the safety and longevity of future biomedical devices.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Softness and firmness are seemingly incompatible traits that synergize to create the unique soft-yet-firm tactility of living tissues pursued in soft robotics, wearable electronics, and plastic surgery. This dichotomy is particularly pronounced in tissues such as fat that are known to be both ultrasoft and ultrafirm. However, synthetically replicating this mechanical response remains elusive since ubiquitously employed soft gels are unable to concurrently reproduce tissue firmness. We have addressed the tissue challenge through the self-assembly of linear-bottlebrush-linear (LBL) block copolymers into thermoplastic elastomers. This hybrid molecular architecture delivers a hierarchical network organization with a cascade of deformation mechanisms responsible for initially low moduli followed by intense strain-stiffening. By bridging the firmness gap between gels and tissues, we have replicated the mechanics of fat, fetal membrane, spinal cord, and brain tissues. These solvent-free, nonleachable, and tissue-mimetic elastomers also show enhanced biocompatibility as demonstrated by cell proliferation studies, all of which are vital for the safety and longevity of future biomedical devices. |
Stock, F; Antoni, F; Aubel, D; Hajjar-Garreau, S; Muller, D Pure carbon conductive transparent electrodes synthetized by a full laser deposition and annealing process Article de journal Applied Surface Science, 505 , p. 144505, 2020. @article{Stock2020, title = {Pure carbon conductive transparent electrodes synthetized by a full laser deposition and annealing process}, author = { F. Stock and F. Antoni and D. Aubel and S. Hajjar-Garreau and D. Muller}, doi = {10.1016/j.apsusc.2019.144505}, year = {2020}, date = {2020-03-01}, journal = {Applied Surface Science}, volume = {505}, pages = {144505}, abstract = {One of the biggest challenge that face optoelectronic and photovoltaic devices is the necessity to provide a reliable alternative to transparent conducing oxide (TCO) like Indium Thin Oxide (ITO). We recently published a study proposing a method to produce transparent conducive electrodes only based on carbon materials. In a first step, we use the Pulsed Laser Deposition (PLD) to produce high performance DLC. Those thin films own very interesting properties in kindship with diamond, like high transparency in the visible range, chemical inertness and biocompatibility. In addition, the DLC is a perfect electrical insulator and presents a relative high opacity in ultra-violet (UV). This particularity has a great interest to perform, in a second step, UV laser annealing over the DLC surface. The aim is to break the existing diamond bindings (sp(3) hybridization) on the surface and allow atoms being reorganized in graphitic bindings (sp(2) hybridization). We demonstrate that the increase of atomic graphitic bindings leads to a valuable surface conductivity. According to optimized annealing parameters, the surface conductivity reaches values comparable to ITO. We also show that the laser treatments only sparsely affects the DLC transparency. Moreover, this full laser-based process remains compatible with the standard microelectronic technological steps.}, keywords = {}, pubstate = {published}, tppubtype = {article} } One of the biggest challenge that face optoelectronic and photovoltaic devices is the necessity to provide a reliable alternative to transparent conducing oxide (TCO) like Indium Thin Oxide (ITO). We recently published a study proposing a method to produce transparent conducive electrodes only based on carbon materials. In a first step, we use the Pulsed Laser Deposition (PLD) to produce high performance DLC. Those thin films own very interesting properties in kindship with diamond, like high transparency in the visible range, chemical inertness and biocompatibility. In addition, the DLC is a perfect electrical insulator and presents a relative high opacity in ultra-violet (UV). This particularity has a great interest to perform, in a second step, UV laser annealing over the DLC surface. The aim is to break the existing diamond bindings (sp(3) hybridization) on the surface and allow atoms being reorganized in graphitic bindings (sp(2) hybridization). We demonstrate that the increase of atomic graphitic bindings leads to a valuable surface conductivity. According to optimized annealing parameters, the surface conductivity reaches values comparable to ITO. We also show that the laser treatments only sparsely affects the DLC transparency. Moreover, this full laser-based process remains compatible with the standard microelectronic technological steps. |
Fawaz, Elyssa G; Salam, Darine A; Daou, Jean T Esterification of linoleic acid using HZSM-5 zeolites with different Si/Al ratios Article de journal Microporous and Mesoporous Materials, 294 , p. 109855, 2020. @article{Fawaz2020, title = {Esterification of linoleic acid using HZSM-5 zeolites with different Si/Al ratios}, author = { Elyssa G. Fawaz and Darine A. Salam and T. Jean Daou}, doi = {10.1016/j.micromeso.2019.109855}, year = {2020}, date = {2020-03-01}, journal = {Microporous and Mesoporous Materials}, volume = {294}, pages = {109855}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Le, Nghia Huu; Hajjar-Garreau, Samar; Bonne, Magali; Megías-Sayago, Cristina; î, Beno; Lebeau, Bénédicte; Balan, Lavinia Photo-induced generation of size controlled Au nanoparticles on pure siliceous ordered mesoporous silica for catalytic applications Article de journal Microporous and Mesoporous Materials, 295 , p. 109952, 2020. @article{Le2020b, title = {Photo-induced generation of size controlled Au nanoparticles on pure siliceous ordered mesoporous silica for catalytic applications}, author = { Nghia Huu Le and Samar Hajjar-Garreau and Magali Bonne and Cristina Megías-Sayago and Beno{î}t Louis and Bénédicte Lebeau and Lavinia Balan}, doi = {10.1016/j.micromeso.2019.109952}, year = {2020}, date = {2020-03-01}, journal = {Microporous and Mesoporous Materials}, volume = {295}, pages = {109952}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Berger, M; Dorge, S; Nouali, H; Habermacher, D; Fiani, E; Vierling, M; Moliere, M; Brilhac, J F; Patarin, J Desulfurization process: understanding of the behaviour of the CuO/SBA-15 type SOx adsorbent in the presence of NO/NO2 and CO/CO2 flue gas environmental pollutants Article de journal Chemical Engineering Journal, 384 , p. 123318, 2020. @article{Berger2020c, title = {Desulfurization process: understanding of the behaviour of the CuO/SBA-15 type SOx adsorbent in the presence of NO/NO2 and CO/CO2 flue gas environmental pollutants}, author = {M Berger and S Dorge and H Nouali and D Habermacher and E Fiani and M Vierling and M Moliere and J F Brilhac and J Patarin}, doi = {10.1016/j.cej.2019.123318}, year = {2020}, date = {2020-03-01}, journal = {Chemical Engineering Journal}, volume = {384}, pages = {123318}, abstract = {SOx (i.e. SO2 and SO3) compounds are known to be a major source of atmospheric pollution and to be responsible of adverse effects on the human health and on the environment. To reduce the SOx emissions, numerous abatement technologies were developed and applied. Nowadays, the most attractive one seems to be the process that use a regenerable SOx adsorbent. In this respect, a CuO (15 wt.%)/SBA-15 regenerable type SOx adsorbent has been developed. Under standard conditions (a gaseous mixture of N-2, SO2 and O-2), the adsorbent exhibits a stable adsorption capacity around 50 mg(SO2)/g(ads) along 10 cycles at 400 degrees C (for a 75 ppm of SO 2 exhaust concentration). The main aim of this work is to study the impact of various regulated pollutants such as CO, CO 2 , NO and NO2 on the SO2 adsorption capacity of the CuO (15 wt.%)/SBA-15 adsorbent. In the presence of CO and CO2, the SO2 adsorption performance of the CuO/SBA adsorbent is similar to the one observed under standard conditions. On the other hand, under NO and NO2 atmosphere, the dynamic and total adsorption capacities of the adsorbent are enhanced up to 25% and no deactivation occurs along the cycles. The increase may be related with the synergetic effect between NO2 and SO2 towards the sulphate formation. The CuO/SBA-15 adsorbent before and after multicycle SO2 adsorption in the presence of regulated pollutants and regeneration under 0.5 vol.% of H-2 have been characterized by XRD and N-2 physisorption. No significant structural and textural change is observed compared to the CuO/SBA-SO2 adsorbent.}, keywords = {}, pubstate = {published}, tppubtype = {article} } SOx (i.e. SO2 and SO3) compounds are known to be a major source of atmospheric pollution and to be responsible of adverse effects on the human health and on the environment. To reduce the SOx emissions, numerous abatement technologies were developed and applied. Nowadays, the most attractive one seems to be the process that use a regenerable SOx adsorbent. In this respect, a CuO (15 wt.%)/SBA-15 regenerable type SOx adsorbent has been developed. Under standard conditions (a gaseous mixture of N-2, SO2 and O-2), the adsorbent exhibits a stable adsorption capacity around 50 mg(SO2)/g(ads) along 10 cycles at 400 degrees C (for a 75 ppm of SO 2 exhaust concentration). The main aim of this work is to study the impact of various regulated pollutants such as CO, CO 2 , NO and NO2 on the SO2 adsorption capacity of the CuO (15 wt.%)/SBA-15 adsorbent. In the presence of CO and CO2, the SO2 adsorption performance of the CuO/SBA adsorbent is similar to the one observed under standard conditions. On the other hand, under NO and NO2 atmosphere, the dynamic and total adsorption capacities of the adsorbent are enhanced up to 25% and no deactivation occurs along the cycles. The increase may be related with the synergetic effect between NO2 and SO2 towards the sulphate formation. The CuO/SBA-15 adsorbent before and after multicycle SO2 adsorption in the presence of regulated pollutants and regeneration under 0.5 vol.% of H-2 have been characterized by XRD and N-2 physisorption. No significant structural and textural change is observed compared to the CuO/SBA-SO2 adsorbent. |
Surajarusarn, Budsaraporn; Hajjar-Garreau, Samar; Schrodj, Gautier; Mougin, Karine; Amornsakchai, Taweechai Comparative study of pineapple leaf microfiber and aramid fiber reinforced natural rubbers using dynamic mechanical analysis Article de journal Polymer Testing, 82 , p. 106289, 2020. @article{Surajarusarn2020, title = {Comparative study of pineapple leaf microfiber and aramid fiber reinforced natural rubbers using dynamic mechanical analysis}, author = { Budsaraporn Surajarusarn and Samar Hajjar-Garreau and Gautier Schrodj and Karine Mougin and Taweechai Amornsakchai}, doi = {10.1016/j.polymertesting.2019.106289}, year = {2020}, date = {2020-02-01}, journal = {Polymer Testing}, volume = {82}, pages = {106289}, abstract = {Natural fiber is often considered inadequate for high performance reinforcement of polymer matrix composites. However, some natural fibers have relatively high mechanical properties with modulus close to that of high-performance synthetic fibers. Since the reinforcing efficiency of a short fiber is determined not only by the fiber modulus, but also by other physical properties such as the length to diameter ratio. Here it is shown, for the first time, that pineapple leaf fiber, whose modulus is somewhat lower than that of aramid fiber, can be used to reinforce natural rubber more effectively than aramid fiber. The situation was achieved by breaking down the fiber bundles into the constituent microfibers to gain very high aspect ratio. Comparisons were made at fiber contents of 2, 5 and 10 parts (by weight) per hundred of rubber (phr) using dynamic mechanical analysis over a range of temperature. The results reveals that at temperature below the glass transition of the matrix rubber and low fiber contents of 2 and 5 phrs, aramid fiber displays slightly better reinforcement efficiency. At high temperatures of 25 and 60 degrees C and high fiber content of 10 phr, pineapple leaf microfiber clearly displays higher reinforcement efficiency than does aramid fiber. Surface modification of the fiber by silane treatment provides a slight improvement in reinforcing efficiency.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Natural fiber is often considered inadequate for high performance reinforcement of polymer matrix composites. However, some natural fibers have relatively high mechanical properties with modulus close to that of high-performance synthetic fibers. Since the reinforcing efficiency of a short fiber is determined not only by the fiber modulus, but also by other physical properties such as the length to diameter ratio. Here it is shown, for the first time, that pineapple leaf fiber, whose modulus is somewhat lower than that of aramid fiber, can be used to reinforce natural rubber more effectively than aramid fiber. The situation was achieved by breaking down the fiber bundles into the constituent microfibers to gain very high aspect ratio. Comparisons were made at fiber contents of 2, 5 and 10 parts (by weight) per hundred of rubber (phr) using dynamic mechanical analysis over a range of temperature. The results reveals that at temperature below the glass transition of the matrix rubber and low fiber contents of 2 and 5 phrs, aramid fiber displays slightly better reinforcement efficiency. At high temperatures of 25 and 60 degrees C and high fiber content of 10 phr, pineapple leaf microfiber clearly displays higher reinforcement efficiency than does aramid fiber. Surface modification of the fiber by silane treatment provides a slight improvement in reinforcing efficiency. |
Hamcerencu, Mihaela; Desbrieres, Jacques; Pop, Marcel; Riess, Gerard Thermo-sensitive gellan maleate/N-isopropylacrylamide hydrogels: initial "in vitro" and "in vivo" evaluation as ocular inserts Article de journal Polymer Bulletin, 77 (2), p. 741–755, 2020. @article{Hamcerencu2020, title = {Thermo-sensitive gellan maleate/N-isopropylacrylamide hydrogels: initial "in vitro" and "in vivo" evaluation as ocular inserts}, author = { Mihaela Hamcerencu and Jacques Desbrieres and Marcel Pop and Gerard Riess}, doi = {10.1007/s00289-019-02772-5}, year = {2020}, date = {2020-02-01}, journal = {Polymer Bulletin}, volume = {77}, number = {2}, pages = {741--755}, abstract = {Hydrogels are among the most used polymer-drug systems, polysaccharide-based materials presenting many advantages to be used for controlled release applications. Gellan maleate/NIPAm hydrogels are hydrophilic swelling matrixes that were originally developed for biomedical applications as controlled release dosage forms. The purpose of this study is to explore the ability of gellan maleate/NIPAm thermoreversible hydrogels for ophthalmic applications as ocular inserts. Studied hydrogels were synthesized by free radical grafting/polymerization of unsaturated esters (gellan maleate) with N-isopropylacrylamide (NIPAm) and N,N '-methylenebisacrylamide as cross-linker. They are evaluated for swelling degree, in vitro inclusion and release of drugs (adrenaline and chloramphenicol) and in vivo biocompatibility. The hydrogel is shown to be a temperature-responsive material with a LCST close to 36 degrees C. The swelling properties and the release of biologically active compounds occur when polymer conformation changes determining phase transition at LCST. Gellan-based hydrogels present reproducible responses to alternation between ambient temperature and human body one. The stability and biocompatibility were evaluated in vitro and in vivo. Tissue response to implantation of hydrogel was determined by histological analysis (haematoxylin-eosin-methylene blue and periodic acid-Schiff). A thin fibrous capsule was observed around the implanted hydrogels. No necrosis, calcification and acute inflammatory reaction were noted. Successful preliminary results were obtained for ophthalmic applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Hydrogels are among the most used polymer-drug systems, polysaccharide-based materials presenting many advantages to be used for controlled release applications. Gellan maleate/NIPAm hydrogels are hydrophilic swelling matrixes that were originally developed for biomedical applications as controlled release dosage forms. The purpose of this study is to explore the ability of gellan maleate/NIPAm thermoreversible hydrogels for ophthalmic applications as ocular inserts. Studied hydrogels were synthesized by free radical grafting/polymerization of unsaturated esters (gellan maleate) with N-isopropylacrylamide (NIPAm) and N,N '-methylenebisacrylamide as cross-linker. They are evaluated for swelling degree, in vitro inclusion and release of drugs (adrenaline and chloramphenicol) and in vivo biocompatibility. The hydrogel is shown to be a temperature-responsive material with a LCST close to 36 degrees C. The swelling properties and the release of biologically active compounds occur when polymer conformation changes determining phase transition at LCST. Gellan-based hydrogels present reproducible responses to alternation between ambient temperature and human body one. The stability and biocompatibility were evaluated in vitro and in vivo. Tissue response to implantation of hydrogel was determined by histological analysis (haematoxylin-eosin-methylene blue and periodic acid-Schiff). A thin fibrous capsule was observed around the implanted hydrogels. No necrosis, calcification and acute inflammatory reaction were noted. Successful preliminary results were obtained for ophthalmic applications. |
Tahraoui, Zakaria; Nouali, Habiba; Marichal, Claire; Forler, Patrice; Klein, Julien; Daou, Jean T Influence of the Compensating Cation Nature on the Water Adsorption Properties of Zeolites Article de journal Molecules, 25 (4), p. 944, 2020. @article{Tahraoui2020a, title = {Influence of the Compensating Cation Nature on the Water Adsorption Properties of Zeolites}, author = { Zakaria Tahraoui and Habiba Nouali and Claire Marichal and Patrice Forler and Julien Klein and T. Jean Daou}, doi = {10.3390/molecules25040944}, year = {2020}, date = {2020-02-01}, journal = {Molecules}, volume = {25}, number = {4}, pages = {944}, publisher = {MDPI AG}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2020 |
Isaac, Carole; Confalonieri, Giorgia; Nouali, Habiba; Paillaud, Jean-Louis; Arletti, Rossella; Daou, Jean T; Ryzhikov, Andrey Unusual high-pressure intrusion-extrusion behavior of electrolyte solutions in Mu-26, a pure silica zeolite of topology STF (Article de journal) Microporous and Mesoporous Materials, 298 , p. 110047, 2020. @article{Isaac2020, title = {Unusual high-pressure intrusion-extrusion behavior of electrolyte solutions in Mu-26, a pure silica zeolite of topology STF}, author = { Carole Isaac and Giorgia Confalonieri and Habiba Nouali and Jean-Louis Paillaud and Rossella Arletti and T. Jean Daou and Andrey Ryzhikov}, doi = {10.1016/j.micromeso.2020.110047}, year = {2020}, date = {2020-05-01}, journal = {Microporous and Mesoporous Materials}, volume = {298}, pages = {110047}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Platek, Anetta; Nita, Cristina; Ghimbeu, Camelia Matei; Frackowiak, Elzbieta; Fic, Krzysztof Electrochemical capacitors operating in aqueous electrolyte with volumetric characteristics improved by sustainable templating of electrode materials (Article de journal) Electrochimica Acta, 338 , p. 135788, 2020. @article{Platek2020, title = {Electrochemical capacitors operating in aqueous electrolyte with volumetric characteristics improved by sustainable templating of electrode materials}, author = { Anetta Platek and Cristina Nita and Camelia Matei Ghimbeu and Elzbieta Frackowiak and Krzysztof Fic}, doi = {10.1016/j.electacta.2020.135788}, year = {2020}, date = {2020-04-01}, journal = {Electrochimica Acta}, volume = {338}, pages = {135788}, abstract = {Soft- and salt-templating methods have been combined to obtain highly microporous carbon materials with mesopores in the narrow pore size range. Phenolic resin was used as a carbon source, and rubidium and caesium chloride were used as salt-templates, giving a well-developed microporosity with a high specific surface area, whereas a sacrificial triblock polymer Pluronic F-127 (soft-template) induced the mesopores of essential importance for fast access of the electrode surface area for the electrolytic solution. The combination of a high specific surface area (up to 2556 m(2) g(-1)) with a suitable pore size (0.77-0.88 nm) resulted in an excellent performance of the electrochemical capacitor. High specific energies of 16.7 Wh.kg(-1) at 300 W kg(-1) of specific power have been achieved for a CsCl-T-based high-voltage (1.5 V) device with a 0.5 mol.L-1 Li2SO4 electrolytic solution. The improved rate handling was allowed to maintain 10 Wh.kg(-1) of specific energy at 4 kW kg(-1) of specific power. In contrast to the other carbons with well-developed porosities, the material density obtained allowed our device to reach competitive, remarkably higher volumetric characteristics. (C) 2020 The Authors. Published by Elsevier Ltd.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Soft- and salt-templating methods have been combined to obtain highly microporous carbon materials with mesopores in the narrow pore size range. Phenolic resin was used as a carbon source, and rubidium and caesium chloride were used as salt-templates, giving a well-developed microporosity with a high specific surface area, whereas a sacrificial triblock polymer Pluronic F-127 (soft-template) induced the mesopores of essential importance for fast access of the electrode surface area for the electrolytic solution. The combination of a high specific surface area (up to 2556 m(2) g(-1)) with a suitable pore size (0.77-0.88 nm) resulted in an excellent performance of the electrochemical capacitor. High specific energies of 16.7 Wh.kg(-1) at 300 W kg(-1) of specific power have been achieved for a CsCl-T-based high-voltage (1.5 V) device with a 0.5 mol.L-1 Li2SO4 electrolytic solution. The improved rate handling was allowed to maintain 10 Wh.kg(-1) of specific energy at 4 kW kg(-1) of specific power. In contrast to the other carbons with well-developed porosities, the material density obtained allowed our device to reach competitive, remarkably higher volumetric characteristics. (C) 2020 The Authors. Published by Elsevier Ltd. |
Dietlin, Celine; Trinh, Thanh Tam; Schweizer, Stephane; Graff, Bernadette; Morlet-Savary, Fabrice; Noirot, Pierre-Antoine; Lalevee, Jacques New Phosphine Oxides as High Performance Near- UV Type I Photoinitiators of Radical Polymerization. (Article de journal) Molecules (Basel, Switzerland), 25 (7), 2020. @article{Dietlin2020, title = {New Phosphine Oxides as High Performance Near- UV Type I Photoinitiators of Radical Polymerization.}, author = { Celine Dietlin and Thanh Tam Trinh and Stephane Schweizer and Bernadette Graff and Fabrice Morlet-Savary and Pierre-Antoine Noirot and Jacques Lalevee}, doi = {10.3390/molecules25071671}, year = {2020}, date = {2020-04-01}, journal = {Molecules (Basel, Switzerland)}, volume = {25}, number = {7}, abstract = {Carbazole structures are of high interest in photopolymerization due to their enhanced light absorption properties in the near-UV or even visible ranges. Therefore, type I photoinitiators combining the carbazole chromophore to the well-established phosphine-oxides were proposed and studied in this article. The aim of this article was to propose type I photoinitiators that can be more reactive than benchmark phosphine oxides, which are among the more reactive type I photoinitiators for a UV or near-UV light emitting diodes (LED) irradiation. Two molecules were synthesized and their UV-visible light absorption properties as well as the quantum yields of photolysis and photopolymerization performances were measured. Remarkably, the associated absorption was enhanced in the 350-410 nm range compared to benchmark phosphine oxides, and one compound was found to be more reactive in photopolymerization than the commercial photoinitiator TPO-L for an irradiation at 395 nm.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Carbazole structures are of high interest in photopolymerization due to their enhanced light absorption properties in the near-UV or even visible ranges. Therefore, type I photoinitiators combining the carbazole chromophore to the well-established phosphine-oxides were proposed and studied in this article. The aim of this article was to propose type I photoinitiators that can be more reactive than benchmark phosphine oxides, which are among the more reactive type I photoinitiators for a UV or near-UV light emitting diodes (LED) irradiation. Two molecules were synthesized and their UV-visible light absorption properties as well as the quantum yields of photolysis and photopolymerization performances were measured. Remarkably, the associated absorption was enhanced in the 350-410 nm range compared to benchmark phosphine oxides, and one compound was found to be more reactive in photopolymerization than the commercial photoinitiator TPO-L for an irradiation at 395 nm. |
Bellanger, Xavier; Schneider, Raphael; Dezanet, Clement; Arroua, Boussad; Balan, Lavinia; Billard, Patrick; Merlin, Christophe Zn2+ leakage and photo-induced reactive oxidative species do not explain the full toxicity of ZnO core Quantum Dots. (Article de journal) Journal of hazardous materials, 396 , p. 122616–122616, 2020. @article{Bellanger2020, title = {Zn2+ leakage and photo-induced reactive oxidative species do not explain the full toxicity of ZnO core Quantum Dots.}, author = { Xavier Bellanger and Raphael Schneider and Clement Dezanet and Boussad Arroua and Lavinia Balan and Patrick Billard and Christophe Merlin}, doi = {10.1016/j.jhazmat.2020.122616}, year = {2020}, date = {2020-04-01}, journal = {Journal of hazardous materials}, volume = {396}, pages = {122616--122616}, abstract = {Metal oxide nanoparticles (NPs), and among them metal oxides Quantum Dots (QDs), exhibit a multifactorial toxicity combining metal leaching, oxidative stress and possibly direct deleterious interactions, the relative contribution of each varying according to the NP composition and surface chemistry. Their wide use in public and industrial domains requires a good understanding and even a good control of their toxicity. To address this question, we engineered ZnO QDs with different surface chemistries, expecting that they would exhibit different photo-induced reactivities and possibly different levels of interaction with biological materials. No photo-induced toxicity could be detected on whole bacterial cell toxicity assays, indicating that ROS-dependent damages, albeit real, are hidden behind a stronger source of toxicity, which was comforted by the fact that the different ZnO QDs displayed the same level of cell toxicity. However, using in vitro DNA damage assays based on quantitative PCR, significant photo-induced reactivity could be measured precisely, showing that different NPs exhibiting similar inhibitory effects on whole bacteria could differ dramatically in terms of ROS-generated damages on biomolecules. We propose that direct interactions between NPs and bacterial cell surfaces prime over any kind of intracellular damages to explain the ZnO QDs toxicity on whole bacterial cells.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Metal oxide nanoparticles (NPs), and among them metal oxides Quantum Dots (QDs), exhibit a multifactorial toxicity combining metal leaching, oxidative stress and possibly direct deleterious interactions, the relative contribution of each varying according to the NP composition and surface chemistry. Their wide use in public and industrial domains requires a good understanding and even a good control of their toxicity. To address this question, we engineered ZnO QDs with different surface chemistries, expecting that they would exhibit different photo-induced reactivities and possibly different levels of interaction with biological materials. No photo-induced toxicity could be detected on whole bacterial cell toxicity assays, indicating that ROS-dependent damages, albeit real, are hidden behind a stronger source of toxicity, which was comforted by the fact that the different ZnO QDs displayed the same level of cell toxicity. However, using in vitro DNA damage assays based on quantitative PCR, significant photo-induced reactivity could be measured precisely, showing that different NPs exhibiting similar inhibitory effects on whole bacteria could differ dramatically in terms of ROS-generated damages on biomolecules. We propose that direct interactions between NPs and bacterial cell surfaces prime over any kind of intracellular damages to explain the ZnO QDs toxicity on whole bacterial cells. |
Le, Cuong Minh Quoc; Schmutz, Marc; Chemtob, Abraham Ab Initio Batch Emulsion Thiol-Ene Photopolymerization (Article de journal) Macromolecules, 53 (7), p. 2369–2379, 2020. @article{Le2020a, title = {Ab Initio Batch Emulsion Thiol-Ene Photopolymerization}, author = { Cuong Minh Quoc Le and Marc Schmutz and Abraham Chemtob}, doi = {10.1021/acs.macromol.0c00265}, year = {2020}, date = {2020-04-01}, journal = {Macromolecules}, volume = {53}, number = {7}, pages = {2369--2379}, abstract = {Very few step polymer latexes have been produced by aqueous emulsion polymerization and never with a clear picture of the operating mechanism. Therefore, finding new means to expand this widely used process industrially beyond chain radical polymerization is highly desirable. Herein, we report the successful photo-initiated thiolene radical polyaddition of an emulsion based on two bifunctional monomers diallyl phthalate and 2,2-(ethylenedioxy)diethanedithiol. After 20 min of irradiation (lambda(max) = 385 nm, 3.7 mW cm(-2)), polymerization resulted in a conversion above 99%, a coagulum-free poly(thioether) latex with a solid content of 10 wt %, a number-average molecular weight of 14 kDa, and an average particle diameter of 60 nm. Reaction kinetics, particle size distribution, and molecular weight progress have been studied in detail. To clarify the mechanism dictating particle formation, the number of particles per unit volume of water has been determined depending on reaction time and surfactant and initiator concentration. The nucleation mode is found to depart significantly from conventional chain radical emulsion polymerization. Polymer particle formation mainly proceeds through the precipitation of oligo-radicals (homogeneous nucleation) even when the concentration of the surfactant exceeds its critical micelle concentration. The end of nucleation (interval I) occurs until a monomer conversion of about 95%. The dispersion's solid content can reach as high as 40%, and the molecular weights remain reasonable (>4 kDa) even if the functional groups are stoichiometrically imbalanced. In contrast to conventional thermally induced polymerization, temporal control is demonstrated through sequential "on"/"off' cycles, and tuning of molecular weights is achieved by precise energetic dosage of radiation. This new step photopolymerization in emulsion thus opens an avenue for the synthesis of linear polysulfide latexes without high energy homogenization and at low irradiance.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Very few step polymer latexes have been produced by aqueous emulsion polymerization and never with a clear picture of the operating mechanism. Therefore, finding new means to expand this widely used process industrially beyond chain radical polymerization is highly desirable. Herein, we report the successful photo-initiated thiolene radical polyaddition of an emulsion based on two bifunctional monomers diallyl phthalate and 2,2-(ethylenedioxy)diethanedithiol. After 20 min of irradiation (lambda(max) = 385 nm, 3.7 mW cm(-2)), polymerization resulted in a conversion above 99%, a coagulum-free poly(thioether) latex with a solid content of 10 wt %, a number-average molecular weight of 14 kDa, and an average particle diameter of 60 nm. Reaction kinetics, particle size distribution, and molecular weight progress have been studied in detail. To clarify the mechanism dictating particle formation, the number of particles per unit volume of water has been determined depending on reaction time and surfactant and initiator concentration. The nucleation mode is found to depart significantly from conventional chain radical emulsion polymerization. Polymer particle formation mainly proceeds through the precipitation of oligo-radicals (homogeneous nucleation) even when the concentration of the surfactant exceeds its critical micelle concentration. The end of nucleation (interval I) occurs until a monomer conversion of about 95%. The dispersion's solid content can reach as high as 40%, and the molecular weights remain reasonable (>4 kDa) even if the functional groups are stoichiometrically imbalanced. In contrast to conventional thermally induced polymerization, temporal control is demonstrated through sequential "on"/"off' cycles, and tuning of molecular weights is achieved by precise energetic dosage of radiation. This new step photopolymerization in emulsion thus opens an avenue for the synthesis of linear polysulfide latexes without high energy homogenization and at low irradiance. |
Montes, M L; Barraque, F; Fuentes, Bursztyn A L; Taylor, M A; Mercader, R C; Miehe-Brendle, J; Sanchez, Torres R M Effect of synthetic beidellite structural characteristics on the properties of beidellite/Fe oxides magnetic composites as Sr and Cs adsorbent materials (Article de journal) Materials Chemistry and Physics, 245 , p. 122760, 2020. @article{Montes2020, title = {Effect of synthetic beidellite structural characteristics on the properties of beidellite/Fe oxides magnetic composites as Sr and Cs adsorbent materials}, author = { M. L. Montes and F. Barraque and A. L. Bursztyn Fuentes and M. A. Taylor and R. C. Mercader and J. Miehe-Brendle and R. M. Torres Sanchez}, doi = {10.1016/j.matchemphys.2020.122760}, year = {2020}, date = {2020-04-01}, journal = {Materials Chemistry and Physics}, volume = {245}, pages = {122760}, abstract = {To design more efficient and versatile sorbent materials for wastewater treatment three magnetic beidellite composites with different cation exchange capacity and total specific surface area have been synthetized, characterized and used as Cs+ and Sr2+ sorbents. Total loaded Fe concentration and its distribution on the magnetic composites seems to be related to the total specific surface area. The higher saturation magnetization, 13.7 +/- 0.7 Am-2/kg, was achieved for the sample with the higher total specific surface area. The main magnetic phases after the synthesis are magnetite and maghemite, whose particle size ranged between 28 and 114 nm, respectively. The Cs+ and Sr2+ sorption capacities of raw and magnetic beidellite composites were similar. The sorption takes place at two different sorption sites of the beidellite composites: the external surface, as indicated by zeta potential changes, and the interlayer space, as revealed by diffraction patterns.}, keywords = {}, pubstate = {published}, tppubtype = {article} } To design more efficient and versatile sorbent materials for wastewater treatment three magnetic beidellite composites with different cation exchange capacity and total specific surface area have been synthetized, characterized and used as Cs+ and Sr2+ sorbents. Total loaded Fe concentration and its distribution on the magnetic composites seems to be related to the total specific surface area. The higher saturation magnetization, 13.7 +/- 0.7 Am-2/kg, was achieved for the sample with the higher total specific surface area. The main magnetic phases after the synthesis are magnetite and maghemite, whose particle size ranged between 28 and 114 nm, respectively. The Cs+ and Sr2+ sorption capacities of raw and magnetic beidellite composites were similar. The sorption takes place at two different sorption sites of the beidellite composites: the external surface, as indicated by zeta potential changes, and the interlayer space, as revealed by diffraction patterns. |
Ahmad, Nur Hidayahni; Daou, Jean T; Maireles-Torres, Pedro; Zaarour, Moussa; Mintova, Svetlana; Ling, Tau-Chuan; Ng, Eng-Poh Morphological effects on catalytic performance of LTL zeolites in acylation of 2-methylfuran enhanced by non-microwave instant heating (Article de journal) Materials Chemistry and Physics, 244 , p. 122688, 2020. @article{Ahmad2020, title = {Morphological effects on catalytic performance of LTL zeolites in acylation of 2-methylfuran enhanced by non-microwave instant heating}, author = { Nur Hidayahni Ahmad and T. Jean Daou and Pedro Maireles-Torres and Moussa Zaarour and Svetlana Mintova and Tau-Chuan Ling and Eng-Poh Ng}, doi = {10.1016/j.matchemphys.2020.122688}, year = {2020}, date = {2020-04-01}, journal = {Materials Chemistry and Physics}, volume = {244}, pages = {122688}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Kiener, Julien; Girleanu, Maria; Ersen, Ovidiu; Parmentier, Julien Direct Insight into the Confinement Effect of WS2 Nanostructures in an Ordered Carbon Matrix (Article de journal) Crystal Growth & Design, 20 (3), p. 2004–2013, 2020. @article{Kiener2020, title = {Direct Insight into the Confinement Effect of WS2 Nanostructures in an Ordered Carbon Matrix}, author = { Julien Kiener and Maria Girleanu and Ovidiu Ersen and Julien Parmentier}, doi = {10.1021/acs.cgd.9b01662}, year = {2020}, date = {2020-03-01}, journal = {Crystal Growth & Design}, volume = {20}, number = {3}, pages = {2004--2013}, abstract = {A new growth mechanism of WS2 nanostructures with well-defined shapes (nanocages or nanotubes), induced by a confinement effect in a mesoporous structure, is reported. As evidenced by high resolution electron microscopy, the growth of these peculiar structures is governed by a restructuration mechanism that occurs in an ordered mesoporous carbon matrix with a nanometric pore size via a one-pot synthesis method (soft-template process) in which W-based clusters are initially dispersed in the carbon walls. During a thermal treatment carried in an Ar/H2S gas mixture and a carbonaceous reductive atmosphere, small WS2 nanolayers stacked and shaped as nanoribbons are produced in a first step within the mesopores at 350 degrees C. In the second step, at higher sulfidation temperature, a solid/gas growth mechanism occurs in which H2S and W gaseous species (originating from the W clusters) decompose and react on initially formed WS2 nanoribbon seeds. That leads to a spatially restricted growth with the progressive formation of curved WS2 nanolayers characterized by ellipsoidal-based shapes characteristic of the inorganic fullerenes (at 550 degrees C) and finally to cylindrical shapes similar to the typical structures observed for most of inorganic nanotubes (at 750 degrees C).}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new growth mechanism of WS2 nanostructures with well-defined shapes (nanocages or nanotubes), induced by a confinement effect in a mesoporous structure, is reported. As evidenced by high resolution electron microscopy, the growth of these peculiar structures is governed by a restructuration mechanism that occurs in an ordered mesoporous carbon matrix with a nanometric pore size via a one-pot synthesis method (soft-template process) in which W-based clusters are initially dispersed in the carbon walls. During a thermal treatment carried in an Ar/H2S gas mixture and a carbonaceous reductive atmosphere, small WS2 nanolayers stacked and shaped as nanoribbons are produced in a first step within the mesopores at 350 degrees C. In the second step, at higher sulfidation temperature, a solid/gas growth mechanism occurs in which H2S and W gaseous species (originating from the W clusters) decompose and react on initially formed WS2 nanoribbon seeds. That leads to a spatially restricted growth with the progressive formation of curved WS2 nanolayers characterized by ellipsoidal-based shapes characteristic of the inorganic fullerenes (at 550 degrees C) and finally to cylindrical shapes similar to the typical structures observed for most of inorganic nanotubes (at 750 degrees C). |
Pichavant, Loic; Lacroix-Desmazes, Patrick; Chemtob, Abraham; Pinaud, Julien; Heroguez, Valerie Polynorbornene latex synthesis by UV-triggered Ring-Opening Metathesis Polymerization in miniemulsion (Article de journal) Polymer, 190 , p. 122200, 2020. @article{Pichavant2020, title = {Polynorbornene latex synthesis by UV-triggered Ring-Opening Metathesis Polymerization in miniemulsion}, author = { Loic Pichavant and Patrick Lacroix-Desmazes and Abraham Chemtob and Julien Pinaud and Valerie Heroguez}, doi = {10.1016/j.polymer.2020.122200}, year = {2020}, date = {2020-03-01}, journal = {Polymer}, volume = {190}, pages = {122200}, abstract = {An innovative route based on a novel photo-latent ROMP initiator has been explored to synthesize polynorbornene latex particles in miniemulsion. Operation conditions were strongly improved by the use of an annular LED photo-reactor, increasing the uniformity of radiation distribution and enabling to control atmosphere and stirring throughout irradiation. Several parameters (droplet size, irradiance, pre-catalyst structure) were studied in order to improve the monomer conversion profiles, which eventually led to the production of latex with high norbornene conversion (>90%) and 10% solids content. Particular attention was paid to the polymer microstructure, which was found to be highly dependent on the type of initiation mechanism.}, keywords = {}, pubstate = {published}, tppubtype = {article} } An innovative route based on a novel photo-latent ROMP initiator has been explored to synthesize polynorbornene latex particles in miniemulsion. Operation conditions were strongly improved by the use of an annular LED photo-reactor, increasing the uniformity of radiation distribution and enabling to control atmosphere and stirring throughout irradiation. Several parameters (droplet size, irradiance, pre-catalyst structure) were studied in order to improve the monomer conversion profiles, which eventually led to the production of latex with high norbornene conversion (>90%) and 10% solids content. Particular attention was paid to the polymer microstructure, which was found to be highly dependent on the type of initiation mechanism. |
Aloulou, Wala; Aloulou, Hajer; Jadda, Amane; Chakraborty, Sudip; Amar, Raja Ben Characterization of an asymmetric ultrafiltration membrane prepared from TiO2-smectite nanocomposites doped with commercial TiO2 and its application to the treatment of textile wastewater (Article de journal) Euro-mediterranean Journal for Environmental Integration, 5 (1), p. 10, 2020. @article{Aloulou2020, title = {Characterization of an asymmetric ultrafiltration membrane prepared from TiO2-smectite nanocomposites doped with commercial TiO2 and its application to the treatment of textile wastewater}, author = { Wala Aloulou and Hajer Aloulou and Amane Jadda and Sudip Chakraborty and Raja Ben Amar}, doi = {10.1007/s41207-020-0145-6}, year = {2020}, date = {2020-03-01}, journal = {Euro-mediterranean Journal for Environmental Integration}, volume = {5}, number = {1}, pages = {10}, abstract = {Inexpensive ultrafiltration ceramic membranes were prepared using three nanoparticle powders created by mixing synthetic TiO2-smectite nanocomposites with commercial TiO2 in various ratios: 95:5 (generating type 1 nanoparticle powder, "NP1"), 85:15 (type 2 nanoparticle powder, "NP2"), and 70:30 (type 3 nanoparticle powder, "NP3"). For each membrane, the active layer that performed the ultrafiltration was deposited on a previously prepared silty marl support ("M") in a layer-by-layer approach using a suspension of the nanoparticles in polyvinyl alcohol solution (PVA) and water. The morphologies and properties of the membranes obtained after sintering at 950 degrees C for 3 h were characterized by BET and SEM. It was observed that the active layers of the three membranes (NP1/M, NP2/M, and NP3/M) were homogeneously structured, exhibited no cracks, and had average pore diameters of 22.5 nm, 16 nm, and 5 nm, respectively. Water permeabilities ranged from 2100 L h(-1) m(-2) bar for the support before layer deposition to 181 L h(-1) m(-2) bar for the NP3/M membrane, which indicates that the latter membrane can be used for ultrafiltration. The performance of the NP3/M membrane was then investigated by studying pure water permeation through the membrane and by using NP3/M to filter pretreated and nonpretreated textile wastewaters. The results showed that ultrafiltration through NP3/M led to significant decreases in the turbidity, color, and chemical oxygen demand (COD) of the wastewaters, while the permeate flux was maintained at an acceptable level. Thus, the NP3/M ultrafiltration membrane developed in this work could be used for the remediation of industrial effluents.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Inexpensive ultrafiltration ceramic membranes were prepared using three nanoparticle powders created by mixing synthetic TiO2-smectite nanocomposites with commercial TiO2 in various ratios: 95:5 (generating type 1 nanoparticle powder, "NP1"), 85:15 (type 2 nanoparticle powder, "NP2"), and 70:30 (type 3 nanoparticle powder, "NP3"). For each membrane, the active layer that performed the ultrafiltration was deposited on a previously prepared silty marl support ("M") in a layer-by-layer approach using a suspension of the nanoparticles in polyvinyl alcohol solution (PVA) and water. The morphologies and properties of the membranes obtained after sintering at 950 degrees C for 3 h were characterized by BET and SEM. It was observed that the active layers of the three membranes (NP1/M, NP2/M, and NP3/M) were homogeneously structured, exhibited no cracks, and had average pore diameters of 22.5 nm, 16 nm, and 5 nm, respectively. Water permeabilities ranged from 2100 L h(-1) m(-2) bar for the support before layer deposition to 181 L h(-1) m(-2) bar for the NP3/M membrane, which indicates that the latter membrane can be used for ultrafiltration. The performance of the NP3/M membrane was then investigated by studying pure water permeation through the membrane and by using NP3/M to filter pretreated and nonpretreated textile wastewaters. The results showed that ultrafiltration through NP3/M led to significant decreases in the turbidity, color, and chemical oxygen demand (COD) of the wastewaters, while the permeate flux was maintained at an acceptable level. Thus, the NP3/M ultrafiltration membrane developed in this work could be used for the remediation of industrial effluents. |
Wang, Dengxia; Arar, Ahmad; Garra, Patxi; Graff, Bernadette; Lalevee, Jacques Charge Transfer Complexes based on Various Amines as Dual Thermal and Photochemical Polymerization Initiators: A Powerful Tool for the Access to Composites (Article de journal) Journal of Polymer Science, 58 (6), p. 811–823, 2020. @article{Wang2020b, title = {Charge Transfer Complexes based on Various Amines as Dual Thermal and Photochemical Polymerization Initiators: A Powerful Tool for the Access to Composites}, author = { Dengxia Wang and Ahmad Arar and Patxi Garra and Bernadette Graff and Jacques Lalevee}, doi = {10.1002/pol.20190248}, year = {2020}, date = {2020-03-01}, journal = {Journal of Polymer Science}, volume = {58}, number = {6}, pages = {811--823}, abstract = {Exploiting highly efficient, environmentally friendly, and economic CTCs (Charger Transfer Complexes) as photo/thermal dual initiators is a huge pursuit of materials practitioners and innovators. To investigate and find out series amines as donors in CTCs, RT-FTIR (Real-Time Fourier Transform Infrared Spectroscopy) was employed to examine the photo initiating efficiency of CTCs based on amines donors and DSC (Differential Scanning Calorimeter) was used to test their thermal initiating ability. The formation of CTCs was investigated and confirmed by molecular orbital (MO) calculations and UV-Vis experimental study. Structure/reactivity/efficiency relationships will be proposed on the base of more than 10 new amine donors. At last, composites based on glass fibers and carbon fibers were fabricated by photo curing and/or photo/thermal dual curing method, which showed excellent mechanical performance in DMA (Dynamic Mechanical Analysis) characterization. This work paves the path toward flexible photo/thermal dual initiators able to react on demand thanks to orthogonal stimuli (light or heat with the same initiating system). It will naturally find use in time and spatially resolved composites manufacturing (were classical simple photoinitiating or thermal systems are inefficient). (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 811-823}, keywords = {}, pubstate = {published}, tppubtype = {article} } Exploiting highly efficient, environmentally friendly, and economic CTCs (Charger Transfer Complexes) as photo/thermal dual initiators is a huge pursuit of materials practitioners and innovators. To investigate and find out series amines as donors in CTCs, RT-FTIR (Real-Time Fourier Transform Infrared Spectroscopy) was employed to examine the photo initiating efficiency of CTCs based on amines donors and DSC (Differential Scanning Calorimeter) was used to test their thermal initiating ability. The formation of CTCs was investigated and confirmed by molecular orbital (MO) calculations and UV-Vis experimental study. Structure/reactivity/efficiency relationships will be proposed on the base of more than 10 new amine donors. At last, composites based on glass fibers and carbon fibers were fabricated by photo curing and/or photo/thermal dual curing method, which showed excellent mechanical performance in DMA (Dynamic Mechanical Analysis) characterization. This work paves the path toward flexible photo/thermal dual initiators able to react on demand thanks to orthogonal stimuli (light or heat with the same initiating system). It will naturally find use in time and spatially resolved composites manufacturing (were classical simple photoinitiating or thermal systems are inefficient). (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 811-823 |
Beda, Adrian; Villevieille, Claire; Taberna, Pierre-Louis; Simon, Patrice; Ghimbeu, Camelia Matei Self-supported binder-free hard carbon electrodes for sodium-ion batteries: insights into their sodium storage mechanisms (Article de journal) Journal of Materials Chemistry A, 8 (11), p. 5558–5571, 2020. @article{Beda2020, title = {Self-supported binder-free hard carbon electrodes for sodium-ion batteries: insights into their sodium storage mechanisms}, author = { Adrian Beda and Claire Villevieille and Pierre-Louis Taberna and Patrice Simon and Camelia Matei Ghimbeu}, doi = {10.1039/c9ta13189b}, year = {2020}, date = {2020-03-01}, journal = {Journal of Materials Chemistry A}, volume = {8}, number = {11}, pages = {5558--5571}, abstract = {Hard carbons are some of the most promising negative electrode materials for sodium-ion batteries (NIBs). In contrast to most of the published studies employing powder-like electrodes containing binders, additives and solvents, we report herein an innovative way to prepare binder-free electrodes by simple impregnation of cellulose and cotton filter papers with a phenolic resin solution. The latter enables improvement of the poor mechanical properties and thermal stability observed for pristine hard carbon self-standing electrodes (SSEs) along with the carbon yield. A high reversible specific capacity and long-term stability were observed for cellulose compared to those of cotton-based SSEs in NIBs, i.e., 240 mA h g(-1)vs. 140 mA h g(-1), respectively, for a C/10 rate and high mass loading (similar to 5.2 mg cm(-2)). This could be ascribed to the larger number of defects on cellulose than on cotton as quantified by temperature programmed desorption coupled with mass-spectrometry (TPD-MS), the structure and porosity being similar for both materials. Furthermore, the addition of a conductive sputter coating on the cellulose SSE surface improved the reversible specific capacity (to similar to 300 mA h g(-1)) and initial coulombic efficiency (ICE) (to 85%). Operando X-ray diffraction (XRD) was performed to provide additional insights into the Na storage mechanisms. Although no shift was noticed for the graphite (002) diffraction peak, clear evidence of sodium intercalation was observed in the plateau region with the appearance of a new diffraction peak (similar to 28.0 degrees 2 theta) likely associated with a sodium intercalation compound. Consequently, the sloping region could be related to the Na+ adsorption on hard carbon defects and pores.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Hard carbons are some of the most promising negative electrode materials for sodium-ion batteries (NIBs). In contrast to most of the published studies employing powder-like electrodes containing binders, additives and solvents, we report herein an innovative way to prepare binder-free electrodes by simple impregnation of cellulose and cotton filter papers with a phenolic resin solution. The latter enables improvement of the poor mechanical properties and thermal stability observed for pristine hard carbon self-standing electrodes (SSEs) along with the carbon yield. A high reversible specific capacity and long-term stability were observed for cellulose compared to those of cotton-based SSEs in NIBs, i.e., 240 mA h g(-1)vs. 140 mA h g(-1), respectively, for a C/10 rate and high mass loading (similar to 5.2 mg cm(-2)). This could be ascribed to the larger number of defects on cellulose than on cotton as quantified by temperature programmed desorption coupled with mass-spectrometry (TPD-MS), the structure and porosity being similar for both materials. Furthermore, the addition of a conductive sputter coating on the cellulose SSE surface improved the reversible specific capacity (to similar to 300 mA h g(-1)) and initial coulombic efficiency (ICE) (to 85%). Operando X-ray diffraction (XRD) was performed to provide additional insights into the Na storage mechanisms. Although no shift was noticed for the graphite (002) diffraction peak, clear evidence of sodium intercalation was observed in the plateau region with the appearance of a new diffraction peak (similar to 28.0 degrees 2 theta) likely associated with a sodium intercalation compound. Consequently, the sloping region could be related to the Na+ adsorption on hard carbon defects and pores. |
Keith, Andrew N; Vatankhah-Varnosfaderani, Mohammad; Clair, Charles; Fahimipour, Farahnaz; Dashtimoghadam, Erfan; Lallam, Abdelaziz; Sztucki, Michael; Ivanov, Dimitri A; Liang, Heyi; Dobrynin, Andrey V; Sheiko, Sergei S Bottlebrush Bridge between Soft Gels and Firm Tissues (Article de journal) Acs Central Science, 6 (3), p. 413–419, 2020. @article{Keith2020, title = {Bottlebrush Bridge between Soft Gels and Firm Tissues}, author = { Andrew N. Keith and Mohammad Vatankhah-Varnosfaderani and Charles Clair and Farahnaz Fahimipour and Erfan Dashtimoghadam and Abdelaziz Lallam and Michael Sztucki and Dimitri A. Ivanov and Heyi Liang and Andrey V Dobrynin and Sergei S. Sheiko}, doi = {10.1021/acscentsci.9b01216}, year = {2020}, date = {2020-03-01}, journal = {Acs Central Science}, volume = {6}, number = {3}, pages = {413--419}, abstract = {Softness and firmness are seemingly incompatible traits that synergize to create the unique soft-yet-firm tactility of living tissues pursued in soft robotics, wearable electronics, and plastic surgery. This dichotomy is particularly pronounced in tissues such as fat that are known to be both ultrasoft and ultrafirm. However, synthetically replicating this mechanical response remains elusive since ubiquitously employed soft gels are unable to concurrently reproduce tissue firmness. We have addressed the tissue challenge through the self-assembly of linear-bottlebrush-linear (LBL) block copolymers into thermoplastic elastomers. This hybrid molecular architecture delivers a hierarchical network organization with a cascade of deformation mechanisms responsible for initially low moduli followed by intense strain-stiffening. By bridging the firmness gap between gels and tissues, we have replicated the mechanics of fat, fetal membrane, spinal cord, and brain tissues. These solvent-free, nonleachable, and tissue-mimetic elastomers also show enhanced biocompatibility as demonstrated by cell proliferation studies, all of which are vital for the safety and longevity of future biomedical devices.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Softness and firmness are seemingly incompatible traits that synergize to create the unique soft-yet-firm tactility of living tissues pursued in soft robotics, wearable electronics, and plastic surgery. This dichotomy is particularly pronounced in tissues such as fat that are known to be both ultrasoft and ultrafirm. However, synthetically replicating this mechanical response remains elusive since ubiquitously employed soft gels are unable to concurrently reproduce tissue firmness. We have addressed the tissue challenge through the self-assembly of linear-bottlebrush-linear (LBL) block copolymers into thermoplastic elastomers. This hybrid molecular architecture delivers a hierarchical network organization with a cascade of deformation mechanisms responsible for initially low moduli followed by intense strain-stiffening. By bridging the firmness gap between gels and tissues, we have replicated the mechanics of fat, fetal membrane, spinal cord, and brain tissues. These solvent-free, nonleachable, and tissue-mimetic elastomers also show enhanced biocompatibility as demonstrated by cell proliferation studies, all of which are vital for the safety and longevity of future biomedical devices. |
Stock, F; Antoni, F; Aubel, D; Hajjar-Garreau, S; Muller, D Pure carbon conductive transparent electrodes synthetized by a full laser deposition and annealing process (Article de journal) Applied Surface Science, 505 , p. 144505, 2020. @article{Stock2020, title = {Pure carbon conductive transparent electrodes synthetized by a full laser deposition and annealing process}, author = { F. Stock and F. Antoni and D. Aubel and S. Hajjar-Garreau and D. Muller}, doi = {10.1016/j.apsusc.2019.144505}, year = {2020}, date = {2020-03-01}, journal = {Applied Surface Science}, volume = {505}, pages = {144505}, abstract = {One of the biggest challenge that face optoelectronic and photovoltaic devices is the necessity to provide a reliable alternative to transparent conducing oxide (TCO) like Indium Thin Oxide (ITO). We recently published a study proposing a method to produce transparent conducive electrodes only based on carbon materials. In a first step, we use the Pulsed Laser Deposition (PLD) to produce high performance DLC. Those thin films own very interesting properties in kindship with diamond, like high transparency in the visible range, chemical inertness and biocompatibility. In addition, the DLC is a perfect electrical insulator and presents a relative high opacity in ultra-violet (UV). This particularity has a great interest to perform, in a second step, UV laser annealing over the DLC surface. The aim is to break the existing diamond bindings (sp(3) hybridization) on the surface and allow atoms being reorganized in graphitic bindings (sp(2) hybridization). We demonstrate that the increase of atomic graphitic bindings leads to a valuable surface conductivity. According to optimized annealing parameters, the surface conductivity reaches values comparable to ITO. We also show that the laser treatments only sparsely affects the DLC transparency. Moreover, this full laser-based process remains compatible with the standard microelectronic technological steps.}, keywords = {}, pubstate = {published}, tppubtype = {article} } One of the biggest challenge that face optoelectronic and photovoltaic devices is the necessity to provide a reliable alternative to transparent conducing oxide (TCO) like Indium Thin Oxide (ITO). We recently published a study proposing a method to produce transparent conducive electrodes only based on carbon materials. In a first step, we use the Pulsed Laser Deposition (PLD) to produce high performance DLC. Those thin films own very interesting properties in kindship with diamond, like high transparency in the visible range, chemical inertness and biocompatibility. In addition, the DLC is a perfect electrical insulator and presents a relative high opacity in ultra-violet (UV). This particularity has a great interest to perform, in a second step, UV laser annealing over the DLC surface. The aim is to break the existing diamond bindings (sp(3) hybridization) on the surface and allow atoms being reorganized in graphitic bindings (sp(2) hybridization). We demonstrate that the increase of atomic graphitic bindings leads to a valuable surface conductivity. According to optimized annealing parameters, the surface conductivity reaches values comparable to ITO. We also show that the laser treatments only sparsely affects the DLC transparency. Moreover, this full laser-based process remains compatible with the standard microelectronic technological steps. |
Fawaz, Elyssa G; Salam, Darine A; Daou, Jean T Esterification of linoleic acid using HZSM-5 zeolites with different Si/Al ratios (Article de journal) Microporous and Mesoporous Materials, 294 , p. 109855, 2020. @article{Fawaz2020, title = {Esterification of linoleic acid using HZSM-5 zeolites with different Si/Al ratios}, author = { Elyssa G. Fawaz and Darine A. Salam and T. Jean Daou}, doi = {10.1016/j.micromeso.2019.109855}, year = {2020}, date = {2020-03-01}, journal = {Microporous and Mesoporous Materials}, volume = {294}, pages = {109855}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Le, Nghia Huu; Hajjar-Garreau, Samar; Bonne, Magali; Megías-Sayago, Cristina; î, Beno; Lebeau, Bénédicte; Balan, Lavinia Photo-induced generation of size controlled Au nanoparticles on pure siliceous ordered mesoporous silica for catalytic applications (Article de journal) Microporous and Mesoporous Materials, 295 , p. 109952, 2020. @article{Le2020b, title = {Photo-induced generation of size controlled Au nanoparticles on pure siliceous ordered mesoporous silica for catalytic applications}, author = { Nghia Huu Le and Samar Hajjar-Garreau and Magali Bonne and Cristina Megías-Sayago and Beno{î}t Louis and Bénédicte Lebeau and Lavinia Balan}, doi = {10.1016/j.micromeso.2019.109952}, year = {2020}, date = {2020-03-01}, journal = {Microporous and Mesoporous Materials}, volume = {295}, pages = {109952}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Berger, M; Dorge, S; Nouali, H; Habermacher, D; Fiani, E; Vierling, M; Moliere, M; Brilhac, J F; Patarin, J Desulfurization process: understanding of the behaviour of the CuO/SBA-15 type SOx adsorbent in the presence of NO/NO2 and CO/CO2 flue gas environmental pollutants (Article de journal) Chemical Engineering Journal, 384 , p. 123318, 2020. @article{Berger2020c, title = {Desulfurization process: understanding of the behaviour of the CuO/SBA-15 type SOx adsorbent in the presence of NO/NO2 and CO/CO2 flue gas environmental pollutants}, author = {M Berger and S Dorge and H Nouali and D Habermacher and E Fiani and M Vierling and M Moliere and J F Brilhac and J Patarin}, doi = {10.1016/j.cej.2019.123318}, year = {2020}, date = {2020-03-01}, journal = {Chemical Engineering Journal}, volume = {384}, pages = {123318}, abstract = {SOx (i.e. SO2 and SO3) compounds are known to be a major source of atmospheric pollution and to be responsible of adverse effects on the human health and on the environment. To reduce the SOx emissions, numerous abatement technologies were developed and applied. Nowadays, the most attractive one seems to be the process that use a regenerable SOx adsorbent. In this respect, a CuO (15 wt.%)/SBA-15 regenerable type SOx adsorbent has been developed. Under standard conditions (a gaseous mixture of N-2, SO2 and O-2), the adsorbent exhibits a stable adsorption capacity around 50 mg(SO2)/g(ads) along 10 cycles at 400 degrees C (for a 75 ppm of SO 2 exhaust concentration). The main aim of this work is to study the impact of various regulated pollutants such as CO, CO 2 , NO and NO2 on the SO2 adsorption capacity of the CuO (15 wt.%)/SBA-15 adsorbent. In the presence of CO and CO2, the SO2 adsorption performance of the CuO/SBA adsorbent is similar to the one observed under standard conditions. On the other hand, under NO and NO2 atmosphere, the dynamic and total adsorption capacities of the adsorbent are enhanced up to 25% and no deactivation occurs along the cycles. The increase may be related with the synergetic effect between NO2 and SO2 towards the sulphate formation. The CuO/SBA-15 adsorbent before and after multicycle SO2 adsorption in the presence of regulated pollutants and regeneration under 0.5 vol.% of H-2 have been characterized by XRD and N-2 physisorption. No significant structural and textural change is observed compared to the CuO/SBA-SO2 adsorbent.}, keywords = {}, pubstate = {published}, tppubtype = {article} } SOx (i.e. SO2 and SO3) compounds are known to be a major source of atmospheric pollution and to be responsible of adverse effects on the human health and on the environment. To reduce the SOx emissions, numerous abatement technologies were developed and applied. Nowadays, the most attractive one seems to be the process that use a regenerable SOx adsorbent. In this respect, a CuO (15 wt.%)/SBA-15 regenerable type SOx adsorbent has been developed. Under standard conditions (a gaseous mixture of N-2, SO2 and O-2), the adsorbent exhibits a stable adsorption capacity around 50 mg(SO2)/g(ads) along 10 cycles at 400 degrees C (for a 75 ppm of SO 2 exhaust concentration). The main aim of this work is to study the impact of various regulated pollutants such as CO, CO 2 , NO and NO2 on the SO2 adsorption capacity of the CuO (15 wt.%)/SBA-15 adsorbent. In the presence of CO and CO2, the SO2 adsorption performance of the CuO/SBA adsorbent is similar to the one observed under standard conditions. On the other hand, under NO and NO2 atmosphere, the dynamic and total adsorption capacities of the adsorbent are enhanced up to 25% and no deactivation occurs along the cycles. The increase may be related with the synergetic effect between NO2 and SO2 towards the sulphate formation. The CuO/SBA-15 adsorbent before and after multicycle SO2 adsorption in the presence of regulated pollutants and regeneration under 0.5 vol.% of H-2 have been characterized by XRD and N-2 physisorption. No significant structural and textural change is observed compared to the CuO/SBA-SO2 adsorbent. |
Surajarusarn, Budsaraporn; Hajjar-Garreau, Samar; Schrodj, Gautier; Mougin, Karine; Amornsakchai, Taweechai Comparative study of pineapple leaf microfiber and aramid fiber reinforced natural rubbers using dynamic mechanical analysis (Article de journal) Polymer Testing, 82 , p. 106289, 2020. @article{Surajarusarn2020, title = {Comparative study of pineapple leaf microfiber and aramid fiber reinforced natural rubbers using dynamic mechanical analysis}, author = { Budsaraporn Surajarusarn and Samar Hajjar-Garreau and Gautier Schrodj and Karine Mougin and Taweechai Amornsakchai}, doi = {10.1016/j.polymertesting.2019.106289}, year = {2020}, date = {2020-02-01}, journal = {Polymer Testing}, volume = {82}, pages = {106289}, abstract = {Natural fiber is often considered inadequate for high performance reinforcement of polymer matrix composites. However, some natural fibers have relatively high mechanical properties with modulus close to that of high-performance synthetic fibers. Since the reinforcing efficiency of a short fiber is determined not only by the fiber modulus, but also by other physical properties such as the length to diameter ratio. Here it is shown, for the first time, that pineapple leaf fiber, whose modulus is somewhat lower than that of aramid fiber, can be used to reinforce natural rubber more effectively than aramid fiber. The situation was achieved by breaking down the fiber bundles into the constituent microfibers to gain very high aspect ratio. Comparisons were made at fiber contents of 2, 5 and 10 parts (by weight) per hundred of rubber (phr) using dynamic mechanical analysis over a range of temperature. The results reveals that at temperature below the glass transition of the matrix rubber and low fiber contents of 2 and 5 phrs, aramid fiber displays slightly better reinforcement efficiency. At high temperatures of 25 and 60 degrees C and high fiber content of 10 phr, pineapple leaf microfiber clearly displays higher reinforcement efficiency than does aramid fiber. Surface modification of the fiber by silane treatment provides a slight improvement in reinforcing efficiency.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Natural fiber is often considered inadequate for high performance reinforcement of polymer matrix composites. However, some natural fibers have relatively high mechanical properties with modulus close to that of high-performance synthetic fibers. Since the reinforcing efficiency of a short fiber is determined not only by the fiber modulus, but also by other physical properties such as the length to diameter ratio. Here it is shown, for the first time, that pineapple leaf fiber, whose modulus is somewhat lower than that of aramid fiber, can be used to reinforce natural rubber more effectively than aramid fiber. The situation was achieved by breaking down the fiber bundles into the constituent microfibers to gain very high aspect ratio. Comparisons were made at fiber contents of 2, 5 and 10 parts (by weight) per hundred of rubber (phr) using dynamic mechanical analysis over a range of temperature. The results reveals that at temperature below the glass transition of the matrix rubber and low fiber contents of 2 and 5 phrs, aramid fiber displays slightly better reinforcement efficiency. At high temperatures of 25 and 60 degrees C and high fiber content of 10 phr, pineapple leaf microfiber clearly displays higher reinforcement efficiency than does aramid fiber. Surface modification of the fiber by silane treatment provides a slight improvement in reinforcing efficiency. |
Hamcerencu, Mihaela; Desbrieres, Jacques; Pop, Marcel; Riess, Gerard Thermo-sensitive gellan maleate/N-isopropylacrylamide hydrogels: initial "in vitro" and "in vivo" evaluation as ocular inserts (Article de journal) Polymer Bulletin, 77 (2), p. 741–755, 2020. @article{Hamcerencu2020, title = {Thermo-sensitive gellan maleate/N-isopropylacrylamide hydrogels: initial "in vitro" and "in vivo" evaluation as ocular inserts}, author = { Mihaela Hamcerencu and Jacques Desbrieres and Marcel Pop and Gerard Riess}, doi = {10.1007/s00289-019-02772-5}, year = {2020}, date = {2020-02-01}, journal = {Polymer Bulletin}, volume = {77}, number = {2}, pages = {741--755}, abstract = {Hydrogels are among the most used polymer-drug systems, polysaccharide-based materials presenting many advantages to be used for controlled release applications. Gellan maleate/NIPAm hydrogels are hydrophilic swelling matrixes that were originally developed for biomedical applications as controlled release dosage forms. The purpose of this study is to explore the ability of gellan maleate/NIPAm thermoreversible hydrogels for ophthalmic applications as ocular inserts. Studied hydrogels were synthesized by free radical grafting/polymerization of unsaturated esters (gellan maleate) with N-isopropylacrylamide (NIPAm) and N,N '-methylenebisacrylamide as cross-linker. They are evaluated for swelling degree, in vitro inclusion and release of drugs (adrenaline and chloramphenicol) and in vivo biocompatibility. The hydrogel is shown to be a temperature-responsive material with a LCST close to 36 degrees C. The swelling properties and the release of biologically active compounds occur when polymer conformation changes determining phase transition at LCST. Gellan-based hydrogels present reproducible responses to alternation between ambient temperature and human body one. The stability and biocompatibility were evaluated in vitro and in vivo. Tissue response to implantation of hydrogel was determined by histological analysis (haematoxylin-eosin-methylene blue and periodic acid-Schiff). A thin fibrous capsule was observed around the implanted hydrogels. No necrosis, calcification and acute inflammatory reaction were noted. Successful preliminary results were obtained for ophthalmic applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Hydrogels are among the most used polymer-drug systems, polysaccharide-based materials presenting many advantages to be used for controlled release applications. Gellan maleate/NIPAm hydrogels are hydrophilic swelling matrixes that were originally developed for biomedical applications as controlled release dosage forms. The purpose of this study is to explore the ability of gellan maleate/NIPAm thermoreversible hydrogels for ophthalmic applications as ocular inserts. Studied hydrogels were synthesized by free radical grafting/polymerization of unsaturated esters (gellan maleate) with N-isopropylacrylamide (NIPAm) and N,N '-methylenebisacrylamide as cross-linker. They are evaluated for swelling degree, in vitro inclusion and release of drugs (adrenaline and chloramphenicol) and in vivo biocompatibility. The hydrogel is shown to be a temperature-responsive material with a LCST close to 36 degrees C. The swelling properties and the release of biologically active compounds occur when polymer conformation changes determining phase transition at LCST. Gellan-based hydrogels present reproducible responses to alternation between ambient temperature and human body one. The stability and biocompatibility were evaluated in vitro and in vivo. Tissue response to implantation of hydrogel was determined by histological analysis (haematoxylin-eosin-methylene blue and periodic acid-Schiff). A thin fibrous capsule was observed around the implanted hydrogels. No necrosis, calcification and acute inflammatory reaction were noted. Successful preliminary results were obtained for ophthalmic applications. |
Tahraoui, Zakaria; Nouali, Habiba; Marichal, Claire; Forler, Patrice; Klein, Julien; Daou, Jean T Influence of the Compensating Cation Nature on the Water Adsorption Properties of Zeolites (Article de journal) Molecules, 25 (4), p. 944, 2020. @article{Tahraoui2020a, title = {Influence of the Compensating Cation Nature on the Water Adsorption Properties of Zeolites}, author = { Zakaria Tahraoui and Habiba Nouali and Claire Marichal and Patrice Forler and Julien Klein and T. Jean Daou}, doi = {10.3390/molecules25040944}, year = {2020}, date = {2020-02-01}, journal = {Molecules}, volume = {25}, number = {4}, pages = {944}, publisher = {MDPI AG}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Thiebault, Thomas; Brendle, Jocelyne; Auge, Gregoire; Limousy, Lionel Cleaner Synthesis of Silylated Clay Minerals for the Durable Recovery of Ions (Co2+ and Sr2+) from Aqueous Solutions (Article de journal) Industrial & Engineering Chemistry Research, 59 (5), p. 2104–2112, 2020. @article{Thiebault2020a, title = {Cleaner Synthesis of Silylated Clay Minerals for the Durable Recovery of Ions (Co2+ and Sr2+) from Aqueous Solutions}, author = { Thomas Thiebault and Jocelyne Brendle and Gregoire Auge and Lionel Limousy}, doi = {10.1021/acs.iecr.9b06118}, year = {2020}, date = {2020-02-01}, journal = {Industrial & Engineering Chemistry Research}, volume = {59}, number = {5}, pages = {2104--2112}, abstract = {The impact of synthesis conditions on the structure and the radionuclide adsorption capacity of silylated clay minerals was evaluated in this study. Two green solvents were selected in this work, phenoxypropanol and glycerol, and various synthesis temperatures (30, 60 and 90 degrees C) were tested for the preparation of 3-aminopropyltriethoxysilane (APTES)-functionalized Laponites. The resulting adsorbents exhibit various extent and location of the grafting reaction as a function of the used solvent and temperature. These modifications of the reactivity of the materials also impact adsorption and desorption properties of Co2+ and Sr2+. However, the two ions are well adsorbed whatever the synthesis conditions, and even in bisolute experiments, the adsorption capacity is not systematically proportional to the amount of loaded APTES, highlighting the specific impact of the synthesis conditions. Finally, the very limited desorption in saline solutions suggests that the synthesized adsorbents display suitable properties for the removal of radionuclides from aqueous solutions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The impact of synthesis conditions on the structure and the radionuclide adsorption capacity of silylated clay minerals was evaluated in this study. Two green solvents were selected in this work, phenoxypropanol and glycerol, and various synthesis temperatures (30, 60 and 90 degrees C) were tested for the preparation of 3-aminopropyltriethoxysilane (APTES)-functionalized Laponites. The resulting adsorbents exhibit various extent and location of the grafting reaction as a function of the used solvent and temperature. These modifications of the reactivity of the materials also impact adsorption and desorption properties of Co2+ and Sr2+. However, the two ions are well adsorbed whatever the synthesis conditions, and even in bisolute experiments, the adsorption capacity is not systematically proportional to the amount of loaded APTES, highlighting the specific impact of the synthesis conditions. Finally, the very limited desorption in saline solutions suggests that the synthesized adsorbents display suitable properties for the removal of radionuclides from aqueous solutions. |
Eren, Tugce Nur; Lalevee, Jacques; Avci, Duygu Water soluble polymeric photoinitiator for dual-curing of acrylates and methacrylates (Article de journal) Journal of Photochemistry and Photobiology A-chemistry, 389 , p. 112288, 2020. @article{Eren2020, title = {Water soluble polymeric photoinitiator for dual-curing of acrylates and methacrylates}, author = { Tugce Nur Eren and Jacques Lalevee and Duygu Avci}, doi = {10.1016/j.jphotochem.2019.112288}, year = {2020}, date = {2020-02-01}, journal = {Journal of Photochemistry and Photobiology A-chemistry}, volume = {389}, pages = {112288}, abstract = {A novel water soluble polymeric (photo)initiator is designed for efficient dual curing of mixtures of acrylates and methacrylates. The initiator (PAATX) functionalized with thioxanthone (10 wt %) was synthesized from the aza-Michael addition reaction of a poly(amido amine) (prepared from the reactions of 1,4-diamino butane with N,N'-methylene bisacrylamide) to 9-oxo-9H-thioxanthen-2-yl acrylate. It was used for polymerization of a mixture of 2-hydroxyethyl methacrylate (HEMA) and poly(ethylene glycol) diacrylate (PEGDA}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel water soluble polymeric (photo)initiator is designed for efficient dual curing of mixtures of acrylates and methacrylates. The initiator (PAATX) functionalized with thioxanthone (10 wt %) was synthesized from the aza-Michael addition reaction of a poly(amido amine) (prepared from the reactions of 1,4-diamino butane with N,N'-methylene bisacrylamide) to 9-oxo-9H-thioxanthen-2-yl acrylate. It was used for polymerization of a mixture of 2-hydroxyethyl methacrylate (HEMA) and poly(ethylene glycol) diacrylate (PEGDA |
Vardopoulos, Ioannis; Konstantopoulos, Ioannis; Zorpas, Antonis A; Limousy, Lionel; Bennici, Simona; Inglezakis, Vassilis J; Voukkali, Irene Sustainable metropolitan areas perspectives through assessment of the existing waste management strategies. (Article de journal) Environmental science and pollution research international, 2020. @article{Vardopoulos2020, title = {Sustainable metropolitan areas perspectives through assessment of the existing waste management strategies.}, author = { Ioannis Vardopoulos and Ioannis Konstantopoulos and Antonis A. Zorpas and Lionel Limousy and Simona Bennici and Vassilis J. Inglezakis and Irene Voukkali}, doi = {10.1007/s11356-020-07930-1}, year = {2020}, date = {2020-02-01}, journal = {Environmental science and pollution research international}, abstract = {Human activities are considered among the main producers of any kind of pollution. This paper, through a Driver-Pressure-State-Impact-Response (DPSIR) model analyses, focuses on the evaluation and assessment of the existing practices, procedures, and results obtained in order to determine whether the municipal solid waste (MSW) management implemented in three major Greek municipalities in the greater urban area of Attica, namely the municipalities of Nea Smirni, Vyronas, and Piraeus, could be considered viable and sustainable. The evaluation indicated that MSW in Greek cities have reduced over the last years, also suggesting a steady downward trend, which could be considered consistent with that of the per capita incomes in Greece due to the extended economic austerity, while at the same time the recycling indicator seems to optimize. The results are very useful for policymakers and local authorities towards taking actions related to the targets set from the circular economy strategies as well as the targets set from United Nation Development Program and the European Green Deal Strategy.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Human activities are considered among the main producers of any kind of pollution. This paper, through a Driver-Pressure-State-Impact-Response (DPSIR) model analyses, focuses on the evaluation and assessment of the existing practices, procedures, and results obtained in order to determine whether the municipal solid waste (MSW) management implemented in three major Greek municipalities in the greater urban area of Attica, namely the municipalities of Nea Smirni, Vyronas, and Piraeus, could be considered viable and sustainable. The evaluation indicated that MSW in Greek cities have reduced over the last years, also suggesting a steady downward trend, which could be considered consistent with that of the per capita incomes in Greece due to the extended economic austerity, while at the same time the recycling indicator seems to optimize. The results are very useful for policymakers and local authorities towards taking actions related to the targets set from the circular economy strategies as well as the targets set from United Nation Development Program and the European Green Deal Strategy. |
Bonardi, Aude-Heloise; Dumur, Frederic; Gigmes, Didier; Xu, Yang-Yang; Lalevee, Jacques Light-Induced Thermal Decomposition of Alkoxyamines upon Infrared CO2 Laser: Toward Spatially Controlled Polymerization of Methacrylates in Laser Write Experiments. (Article de journal) ACS omega, 5 (6), p. 3043–3046, 2020. @article{Bonardi2020, title = {Light-Induced Thermal Decomposition of Alkoxyamines upon Infrared CO2 Laser: Toward Spatially Controlled Polymerization of Methacrylates in Laser Write Experiments.}, author = { Aude-Heloise Bonardi and Frederic Dumur and Didier Gigmes and Yang-Yang Xu and Jacques Lalevee}, doi = {10.1021/acsomega.9b04281}, year = {2020}, date = {2020-02-01}, journal = {ACS omega}, volume = {5}, number = {6}, pages = {3043--3046}, abstract = {Systems combining photopolymerization and thermal polymerization have already been reported in the literature. Upon near-infrared (NIR) light exposure, this principle of polymerization is called photoinduced thermal polymerization or photothermal polymerization. Thanks to an NIR dye used as the light-to-heat convertor (called hereafter a heater), an alkoxyamine (e.g., BlocBuilder-MA) is dissociated upon NIR light irradiation, initiating the free-radical polymerization of methacrylates. In the present paper, a novel approach is presented for the first time to decompose the alkoxyamine through a direct heat generation upon mid-infrared irradiation by a CO2 laser at 10.6 mum. Compared with previous approaches, there is no additional heater used in this work, as the heat is directly generated by laser irradiation on the alkoxyamine/monomer system. The polymerization can be initiated for benchmark methacrylate monomers with spatial controllability, that is, only in the laser-irradiated area, opening the way for laser write or three-dimensional printing applications in the presence of fillers.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Systems combining photopolymerization and thermal polymerization have already been reported in the literature. Upon near-infrared (NIR) light exposure, this principle of polymerization is called photoinduced thermal polymerization or photothermal polymerization. Thanks to an NIR dye used as the light-to-heat convertor (called hereafter a heater), an alkoxyamine (e.g., BlocBuilder-MA) is dissociated upon NIR light irradiation, initiating the free-radical polymerization of methacrylates. In the present paper, a novel approach is presented for the first time to decompose the alkoxyamine through a direct heat generation upon mid-infrared irradiation by a CO2 laser at 10.6 mum. Compared with previous approaches, there is no additional heater used in this work, as the heat is directly generated by laser irradiation on the alkoxyamine/monomer system. The polymerization can be initiated for benchmark methacrylate monomers with spatial controllability, that is, only in the laser-irradiated area, opening the way for laser write or three-dimensional printing applications in the presence of fillers. |
Ghrear, Tamara Mahmoud Ali; Ng, Eng-Poh; Vaulot, Cyril; Daou, Jean T; Ling, Tau Chuan; Tan, Soon Huat; Ooi, Boon Seng; Mintova, Svetlana Recyclable synthesis of Cs-ABW zeolite nanocrystals from non-reacted mother liquors with excellent catalytic henry reaction performance (Article de journal) Journal of Environmental Chemical Engineering, 8 (1), p. 103579, 2020. @article{Ghrear2020, title = {Recyclable synthesis of Cs-ABW zeolite nanocrystals from non-reacted mother liquors with excellent catalytic henry reaction performance}, author = { Tamara Mahmoud Ali Ghrear and Eng-Poh Ng and Cyril Vaulot and T. Jean Daou and Tau Chuan Ling and Soon Huat Tan and Boon Seng Ooi and Svetlana Mintova}, doi = {10.1016/j.jece.2019.103579}, year = {2020}, date = {2020-02-01}, journal = {Journal of Environmental Chemical Engineering}, volume = {8}, number = {1}, pages = {103579}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Baralle, Alexandre; Garra, Patxi; Morlet-Savary, Fabrice; Dietlin, Celine; Fouassier, Jean-Pierre; Lalevee, Jacques Polymeric Iodonium Salts to Trigger Free Radical Photopolymerization. (Article de journal) Macromolecular rapid communications, p. e1900644–e1900644, 2020. @article{Baralle2020, title = {Polymeric Iodonium Salts to Trigger Free Radical Photopolymerization.}, author = { Alexandre Baralle and Patxi Garra and Fabrice Morlet-Savary and Celine Dietlin and Jean-Pierre Fouassier and Jacques Lalevee}, doi = {10.1002/marc.201900644}, year = {2020}, date = {2020-02-01}, journal = {Macromolecular rapid communications}, pages = {e1900644--e1900644}, abstract = {In a significant breakthrough from classical molecular (i.e., nonpolymeric) iodonium salts in light-induced photochemistry, the synthesis and use of new safer polymeric iodonium salts are reported here. They are shown to be involved in charge transfer complexes (CTCs) while in interaction with a safe amino acid derivative (N-phenylglycine). Also, this study demonstrates i) the formation of CTCs between the iodonium (acceptor) and an aryl/alkyl amine (donor) through UV-vis measurements of the monomer, ii) the formation of radicals in electron spin resonance spin trapping experiments when the CTCs are irradiated by visible light (405 nm), and iii) their efficiency as a photoinitiator to polymerize three different acrylic monomers under LED irradiation at 405 nm under air and their application to 3D resolved laser writing of thick samples (3 mm). High reactivity for polymeric iodonium salts comparable with molecular ones is exhibited with the advantage of potential lower migration. To the best of the authors' knowledge, this is the first reported instance of polymeric iodonium salts acting as polymerization initiators.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In a significant breakthrough from classical molecular (i.e., nonpolymeric) iodonium salts in light-induced photochemistry, the synthesis and use of new safer polymeric iodonium salts are reported here. They are shown to be involved in charge transfer complexes (CTCs) while in interaction with a safe amino acid derivative (N-phenylglycine). Also, this study demonstrates i) the formation of CTCs between the iodonium (acceptor) and an aryl/alkyl amine (donor) through UV-vis measurements of the monomer, ii) the formation of radicals in electron spin resonance spin trapping experiments when the CTCs are irradiated by visible light (405 nm), and iii) their efficiency as a photoinitiator to polymerize three different acrylic monomers under LED irradiation at 405 nm under air and their application to 3D resolved laser writing of thick samples (3 mm). High reactivity for polymeric iodonium salts comparable with molecular ones is exhibited with the advantage of potential lower migration. To the best of the authors' knowledge, this is the first reported instance of polymeric iodonium salts acting as polymerization initiators. |
Kournoutas, Fotis; Fihey, Arnaud; Malval, Jean-Pierre; Spangenberg, Arnaud; Feckova, Michaela; le Poul, Pascal; Katan, Claudine; Guen, Francoise Robin-le; Bures, Filip; Achelle, Sylvain; Fakis, Mihalis Branching effect on the linear and nonlinear optical properties of styrylpyrimidines. (Article de journal) Physical chemistry chemical physics : PCCP, 2020. @article{Kournoutas2020, title = {Branching effect on the linear and nonlinear optical properties of styrylpyrimidines.}, author = { Fotis Kournoutas and Arnaud Fihey and Jean-Pierre Malval and Arnaud Spangenberg and Michaela Feckova and Pascal le Poul and Claudine Katan and Francoise Robin-le Guen and Filip Bures and Sylvain Achelle and Mihalis Fakis}, doi = {10.1039/c9cp06476a}, year = {2020}, date = {2020-02-01}, journal = {Physical chemistry chemical physics : PCCP}, abstract = {This contribution aims at investigating the branching effect on the steady state, time resolved fluorescence and two-photon absorption (2PA) properties of dimethylamino and diphenylamino substituted styrylpyrimidine derivatives, by means of a combined experimental and theoretical study. In contrast to classical branched molecules with a triphenylamine central core and electron accepting groups at the periphery, here, branched molecules with reverse topology and different symmetries are examined, namely a styrylpyrimidine group is used as the electron withdrawing core and dimethylamino or diphenylamino donors are incorporated at the periphery. Besides, compared to the great majority of existing branched systems, the herein studied molecules do not have C3 symmetry. For this reason, the region of the linear and non-linear optical spectra of the two and three branched chromophores is actually similar. Interestingly, while the one-photon absorption spectra of one-branched systems versus two- or three-branched ones are spectrally shifted, there is almost no spectral shift in the main 2PA spectral region. Meanwhile, there is still an enhancement of both linear and nonlinear optical responses. Overall, here we developed a strategy that enhances the 2PA response while maintaining the spectral position. Specifically, 2PA cross section values as high as 500 GM have been obtained for the diphenylamino A-(pi-D)3 molecule in dichloromethane.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This contribution aims at investigating the branching effect on the steady state, time resolved fluorescence and two-photon absorption (2PA) properties of dimethylamino and diphenylamino substituted styrylpyrimidine derivatives, by means of a combined experimental and theoretical study. In contrast to classical branched molecules with a triphenylamine central core and electron accepting groups at the periphery, here, branched molecules with reverse topology and different symmetries are examined, namely a styrylpyrimidine group is used as the electron withdrawing core and dimethylamino or diphenylamino donors are incorporated at the periphery. Besides, compared to the great majority of existing branched systems, the herein studied molecules do not have C3 symmetry. For this reason, the region of the linear and non-linear optical spectra of the two and three branched chromophores is actually similar. Interestingly, while the one-photon absorption spectra of one-branched systems versus two- or three-branched ones are spectrally shifted, there is almost no spectral shift in the main 2PA spectral region. Meanwhile, there is still an enhancement of both linear and nonlinear optical responses. Overall, here we developed a strategy that enhances the 2PA response while maintaining the spectral position. Specifically, 2PA cross section values as high as 500 GM have been obtained for the diphenylamino A-(pi-D)3 molecule in dichloromethane. |
Oliveira, Larissa V F; Bennici, Simona; Josien, Ludovic; Limousy, Lionel; Bizeto, Marcos A; Camilo, Fernanda F Free-standing cellulose film containing manganese dioxide nanoparticles and its use in discoloration of indigo carmine dye (Article de journal) Carbohydrate Polymers, 230 , p. 115621, 2020. @article{Oliveira2020c, title = {Free-standing cellulose film containing manganese dioxide nanoparticles and its use in discoloration of indigo carmine dye}, author = { Larissa V. F. Oliveira and Simona Bennici and Ludovic Josien and Lionel Limousy and Marcos A. Bizeto and Fernanda F. Camilo}, doi = {10.1016/j.carbpol.2019.115621}, year = {2020}, date = {2020-02-01}, journal = {Carbohydrate Polymers}, volume = {230}, pages = {115621}, abstract = {In this study, we report the production of a free-standing film of non-modified cellulose impregnated with 12 wt % of MnO2 nanoparticles with less than 100 nm in size. The method here described can be applied to the immobilization of different types of nanoparticles. The film was prepared by dissolving microcrystalline cellulose in an ionic liquid followed by its regeneration by adding water to the former solution. Then, the wet film was impregnated with the nanoparticles by dipping it in a MnO2 dispersion. Electron microscopy images revealed manganese dioxide nanoparticles distributed not only at the film surface but also in its interior. The cellulose film impregnated with MnO2 nanoparticles was capable of efficiently discolouring an Indigo Carmine dye solution in 25 min upon ambient light. The film was easily removed from the dye solution and repeatedly reused for at least 10 times without losing its discolouring efficiency.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this study, we report the production of a free-standing film of non-modified cellulose impregnated with 12 wt % of MnO2 nanoparticles with less than 100 nm in size. The method here described can be applied to the immobilization of different types of nanoparticles. The film was prepared by dissolving microcrystalline cellulose in an ionic liquid followed by its regeneration by adding water to the former solution. Then, the wet film was impregnated with the nanoparticles by dipping it in a MnO2 dispersion. Electron microscopy images revealed manganese dioxide nanoparticles distributed not only at the film surface but also in its interior. The cellulose film impregnated with MnO2 nanoparticles was capable of efficiently discolouring an Indigo Carmine dye solution in 25 min upon ambient light. The film was easily removed from the dye solution and repeatedly reused for at least 10 times without losing its discolouring efficiency. |
Bonardi, Aude-Heloise; Bonardi, Fabien; Noirbent, Guillaume; Dumur, Frederic; Gigmes, Didier; Dietlin, Celine; Lalevee, Jacques Free-radical polymerization upon near-infrared light irradiation, merging photochemical and photothermal initiating methods (Article de journal) Journal of Polymer Science, 58 (2), p. 300–308, 2020. @article{Bonardi2020b, title = {Free-radical polymerization upon near-infrared light irradiation, merging photochemical and photothermal initiating methods}, author = { Aude-Heloise Bonardi and Fabien Bonardi and Guillaume Noirbent and Frederic Dumur and Didier Gigmes and Celine Dietlin and Jacques Lalevee}, doi = {10.1002/pol.20190079}, year = {2020}, date = {2020-01-01}, journal = {Journal of Polymer Science}, volume = {58}, number = {2}, pages = {300--308}, abstract = {Polymerization of (meth)acrylate resins upon near-infrared (NIR) light remains a huge challenge. In this study, a new photoinduced method of polymerization of methacrylic monomers is presented, originally merging a photochemical and a photothermal pathway. A four-component system is proposed comprising an NIR dye combined with an iodonium salt, a phosphine, and a thermal initiator. A selection of dyes is suggested regarding electron transfer properties and/or light-to-heat conversion abilities. Several thermal initiators are studied: an alkoxyamine (BlocBuilder MA), an azo derivative, and a peroxide. For the first time, an NIR absorbing dye is used in photopolymerization using both its capacities of light-to-heat conversion and its ability to initiate an electron transfer reaction. Three wavelengths of irradiation will be presented here: 785, 940, and 1064nm. These long wavelengths are challenging because the energy of photons is extremely low but these wavelengths offer significant advantages in term of light penetration (e.g., for the access to composites through photopolymerization processes). The different systems presented here exhibit high and rapid conversions of methacrylate functions. The underlying chemical mechanism will be fully depicted by real-time Fourier transform infrared spectroscopy and thermal imaging measurements. (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 300-308}, keywords = {}, pubstate = {published}, tppubtype = {article} } Polymerization of (meth)acrylate resins upon near-infrared (NIR) light remains a huge challenge. In this study, a new photoinduced method of polymerization of methacrylic monomers is presented, originally merging a photochemical and a photothermal pathway. A four-component system is proposed comprising an NIR dye combined with an iodonium salt, a phosphine, and a thermal initiator. A selection of dyes is suggested regarding electron transfer properties and/or light-to-heat conversion abilities. Several thermal initiators are studied: an alkoxyamine (BlocBuilder MA), an azo derivative, and a peroxide. For the first time, an NIR absorbing dye is used in photopolymerization using both its capacities of light-to-heat conversion and its ability to initiate an electron transfer reaction. Three wavelengths of irradiation will be presented here: 785, 940, and 1064nm. These long wavelengths are challenging because the energy of photons is extremely low but these wavelengths offer significant advantages in term of light penetration (e.g., for the access to composites through photopolymerization processes). The different systems presented here exhibit high and rapid conversions of methacrylate functions. The underlying chemical mechanism will be fully depicted by real-time Fourier transform infrared spectroscopy and thermal imaging measurements. (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 300-308 |
Mousawi, Assi Al; Garra, Patxi; Dumur, Frederic; Graff, Bernadette; Fouassier, Jean Pierre; Lalevee, Jacques Flavones as natural photoinitiators for light mediated free-radical polymerization via light emitting diodes (Article de journal) Journal of Polymer Science, 58 (2), p. 254–262, 2020. @article{AlMousawi2020, title = {Flavones as natural photoinitiators for light mediated free-radical polymerization via light emitting diodes}, author = { Assi Al Mousawi and Patxi Garra and Frederic Dumur and Bernadette Graff and Jean Pierre Fouassier and Jacques Lalevee}, doi = {10.1002/pol.20190044}, year = {2020}, date = {2020-01-01}, journal = {Journal of Polymer Science}, volume = {58}, number = {2}, pages = {254--262}, abstract = {In this work, we propose the use of flavones that can be derived from natural products as versatile high performance visible light photoinitiators initially with amino acid and later with iodonium salt and phosphino benzoic acid combinations for free-radical polymerization acrylates of thin specimen (25 mu m) and methacrylates thick specimen (1.4mm) upon illumination with near ultraviolet light or visible light utilizing light emitting diodes (LED)@385nm and LED@405nm. High polymerization initiating capabilities are found with different hydroxyflavones and high final conversions of the reactive function are obtained. Their application as materials for three-dimensional (3D) printing patterns is especially carried out for 1mm thick 3D printed photopolymers. A full description of the comprised photochemical mechanisms is additionally given. (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 254-262}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this work, we propose the use of flavones that can be derived from natural products as versatile high performance visible light photoinitiators initially with amino acid and later with iodonium salt and phosphino benzoic acid combinations for free-radical polymerization acrylates of thin specimen (25 mu m) and methacrylates thick specimen (1.4mm) upon illumination with near ultraviolet light or visible light utilizing light emitting diodes (LED)@385nm and LED@405nm. High polymerization initiating capabilities are found with different hydroxyflavones and high final conversions of the reactive function are obtained. Their application as materials for three-dimensional (3D) printing patterns is especially carried out for 1mm thick 3D printed photopolymers. A full description of the comprised photochemical mechanisms is additionally given. (c) 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 254-262 |
Sautrot-Ba, Pauline; Jockusch, Steffen; Malval, Jean-Pierre; Brezova, Vlasta; Rivard, Michael; Abbad-Andaloussi, Samir; Blacha-Grzechnik, Agata; Versace, Davy-Louis Quinizarin Derivatives as Photoinitiators for Free-Radical and Cationic Photopolymerizations in the Visible Spectral Range (Article de journal) Macromolecules, 53 (4), p. 1129–1141, 2020. @article{Sautrot-Ba2020, title = {Quinizarin Derivatives as Photoinitiators for Free-Radical and Cationic Photopolymerizations in the Visible Spectral Range}, author = { Pauline Sautrot-Ba and Steffen Jockusch and Jean-Pierre Malval and Vlasta Brezova and Michael Rivard and Samir Abbad-Andaloussi and Agata Blacha-Grzechnik and Davy-Louis Versace}, doi = {10.1021/acs.macromol.9b02448}, year = {2020}, date = {2020-01-01}, journal = {Macromolecules}, volume = {53}, number = {4}, pages = {1129--1141}, abstract = {We report the use of efficient visible-light sensitive ally] (QA) and epoxidized (QE) quinizarin derivatives as photoinitiating systems when combined with an appropriate electron donor (methyldiethanol amine, MDEA), an electron acceptor (iodonium salt, Iod), or a H donor (thiol derivative), for free-radical photopolymerization (FRP), cationic photopolymerization (CP), and a thiol-ene process. These systems have demonstrated excellent initiating properties under air or in laminated conditions under visible-light irradiation (LEDs@405, 455, and 470 nm or Xe lamp) for FRP, CP, or the thiol-ene process and appear more efficient than the well-known camphorquinone-based photoinitiating systems. As highlighted by electron paramagnetic resonance (EPR) and laser flash photolysis experiments, QA (or QE) acts either as an electron donor via a photoinduced electron transfer pathway with Iod or as a proton/ proton-coupled electron transfer promoter with MDEA or a thiol derivative. Two types of interpenetrated polymer networks have been synthesized either by CP and the thiol-ene process with di(ethylene glycol) divinyl ether/trithiol or by a concomitant free radical and cationic photopolymerization with an epoxide/acrylate blend mixture upon LED@455 or 470 nm exposure. Interestingly, the resulting quinizarin-derived materials showed antiadherence properties under visible-light exposure even after two cycles of antibacterial experiments. Quinizarin derivatives can not only initiate photopolymerization but also generate singlet oxygen on the surface of the materials for preventing the adhesion and proliferation of bacteria under visible-light activation.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report the use of efficient visible-light sensitive ally] (QA) and epoxidized (QE) quinizarin derivatives as photoinitiating systems when combined with an appropriate electron donor (methyldiethanol amine, MDEA), an electron acceptor (iodonium salt, Iod), or a H donor (thiol derivative), for free-radical photopolymerization (FRP), cationic photopolymerization (CP), and a thiol-ene process. These systems have demonstrated excellent initiating properties under air or in laminated conditions under visible-light irradiation (LEDs@405, 455, and 470 nm or Xe lamp) for FRP, CP, or the thiol-ene process and appear more efficient than the well-known camphorquinone-based photoinitiating systems. As highlighted by electron paramagnetic resonance (EPR) and laser flash photolysis experiments, QA (or QE) acts either as an electron donor via a photoinduced electron transfer pathway with Iod or as a proton/ proton-coupled electron transfer promoter with MDEA or a thiol derivative. Two types of interpenetrated polymer networks have been synthesized either by CP and the thiol-ene process with di(ethylene glycol) divinyl ether/trithiol or by a concomitant free radical and cationic photopolymerization with an epoxide/acrylate blend mixture upon LED@455 or 470 nm exposure. Interestingly, the resulting quinizarin-derived materials showed antiadherence properties under visible-light exposure even after two cycles of antibacterial experiments. Quinizarin derivatives can not only initiate photopolymerization but also generate singlet oxygen on the surface of the materials for preventing the adhesion and proliferation of bacteria under visible-light activation. |
Kirschner, Julie; Becht, Jean-Michel; Klee, Joachim E; Lalevee, Jacques A New Phosphine for Efficient Free Radical Polymerization under Air (Article de journal) Macromolecular Rapid Communications, p. 2000053, 2020. @article{Kirschner2020a, title = {A New Phosphine for Efficient Free Radical Polymerization under Air}, author = { Julie Kirschner and Jean-Michel Becht and Joachim E. Klee and Jacques Lalevee}, doi = {10.1002/marc.202000053}, year = {2020}, date = {2020-01-01}, journal = {Macromolecular Rapid Communications}, pages = {2000053}, abstract = {A new phosphine is proposed as efficient coinitiator for camphorquinone (CQ)-based photoinitiating systems for the free radical polymerization of (meth)acrylates. Remarkably, this new co-initiator can exhibit two functionalities: a phosphine moiety to overcome oxygen inhibition and an iodonium salt moiety as counter cation to initiate the polymerization process. Excellent polymerization performances in the presence of CQ for the free radical polymerization of methacrylates under blue light are observed, and amine-free systems can be easily developed from the proposed structure. The photopolymerization of composites is also investigated in the presence of the new phosphine (without iodonium counter cation) and very interesting depth of cure can be obtained from the new developed photoinitiating system after only 20 s of irradiation with a blue light-emitting diode.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new phosphine is proposed as efficient coinitiator for camphorquinone (CQ)-based photoinitiating systems for the free radical polymerization of (meth)acrylates. Remarkably, this new co-initiator can exhibit two functionalities: a phosphine moiety to overcome oxygen inhibition and an iodonium salt moiety as counter cation to initiate the polymerization process. Excellent polymerization performances in the presence of CQ for the free radical polymerization of methacrylates under blue light are observed, and amine-free systems can be easily developed from the proposed structure. The photopolymerization of composites is also investigated in the presence of the new phosphine (without iodonium counter cation) and very interesting depth of cure can be obtained from the new developed photoinitiating system after only 20 s of irradiation with a blue light-emitting diode. |
Arar, Ahmad; Mokbel, Haifaa; Dumur, Frederic; Lalevee, Jacques High Performance Redox Initiating Systems Based on the Interaction of Silane with Metal Complexes: A Unique Platform for the Preparation of Composites. (Article de journal) Molecules (Basel, Switzerland), 25 (7), 2020. @article{Arar2020, title = {High Performance Redox Initiating Systems Based on the Interaction of Silane with Metal Complexes: A Unique Platform for the Preparation of Composites.}, author = { Ahmad Arar and Haifaa Mokbel and Frederic Dumur and Jacques Lalevee}, doi = {10.3390/molecules25071602}, year = {2020}, date = {2020-01-01}, journal = {Molecules (Basel, Switzerland)}, volume = {25}, number = {7}, abstract = {Currently, Redox Initiating Systems (RISs) of Free Radical Polymerization (FRP) are mainly based on the interaction of aromatic amines with peroxides (e.g., dibenzoyl peroxide (BPO)) that can be both toxic and unstable. In the present work, we aim to replace these hazardous substances in new RIS that can be peroxide-free and amine-free. Our redox two components (2K) initiating system is based on diphenylsilane (DPS) as reducing agent combined with different metal complexes (Mn(acac)2, Cu(AAEMA)2 or Fe(acac)3) as oxidizing agents. For the new proposed RIS, an excellent reactivity is found for the polymerization of benchmark methacrylate monomers under mild conditions (redox polymerization done under air and at room temperature); remarkably, it is also possible to finely control the gel time. Different techniques (optical pyrometry, Real-Time FTIR spectroscopy, Cyclic Voltammetry and Electron Spin Resonance (ESR)) were used to follow the polymerization processes but also to shed some light on the new redox chemical mechanisms.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Currently, Redox Initiating Systems (RISs) of Free Radical Polymerization (FRP) are mainly based on the interaction of aromatic amines with peroxides (e.g., dibenzoyl peroxide (BPO)) that can be both toxic and unstable. In the present work, we aim to replace these hazardous substances in new RIS that can be peroxide-free and amine-free. Our redox two components (2K) initiating system is based on diphenylsilane (DPS) as reducing agent combined with different metal complexes (Mn(acac)2, Cu(AAEMA)2 or Fe(acac)3) as oxidizing agents. For the new proposed RIS, an excellent reactivity is found for the polymerization of benchmark methacrylate monomers under mild conditions (redox polymerization done under air and at room temperature); remarkably, it is also possible to finely control the gel time. Different techniques (optical pyrometry, Real-Time FTIR spectroscopy, Cyclic Voltammetry and Electron Spin Resonance (ESR)) were used to follow the polymerization processes but also to shed some light on the new redox chemical mechanisms. |
Chaillot, Dylan; Bennici, Simona; Brendle, Jocelyne Layered double hydroxides and LDH-derived materials in chosen environmental applications: a review (Article de journal) Environmental Science and Pollution Research, 2020. @article{Chaillot2020, title = {Layered double hydroxides and LDH-derived materials in chosen environmental applications: a review}, author = { Dylan Chaillot and Simona Bennici and Jocelyne Brendle}, doi = {10.1007/s11356-020-08498-6}, year = {2020}, date = {2020-01-01}, journal = {Environmental Science and Pollution Research}, abstract = {With increasing global warming awareness, layered double hydroxides (LDHs), hydrotalcites, and their related materials are key components to reduce the environmental impact of human activities. Such materials can be synthesized quickly with high efficiency by using different synthesis processes. Moreover, their properties' tunability is appreciated in various industrial processes. Regarding physical and structural properties, such materials can be applied in environmental applications such as the adsorption of atmospheric and aqueous pollutants, hydrogen production, or the formation of 5-hydroxymethylfurfural (5-HMF). After the first part that was dedicated to the synthesis processes of hydrotalcites, the present review reports on specific environmental applications chosen as examples in various fields (green chemistry and depollution) that have gained increasing interest in the last decades, enlightening the links between structural properties, synthesis route, and application using lamellar materials.}, keywords = {}, pubstate = {published}, tppubtype = {article} } With increasing global warming awareness, layered double hydroxides (LDHs), hydrotalcites, and their related materials are key components to reduce the environmental impact of human activities. Such materials can be synthesized quickly with high efficiency by using different synthesis processes. Moreover, their properties' tunability is appreciated in various industrial processes. Regarding physical and structural properties, such materials can be applied in environmental applications such as the adsorption of atmospheric and aqueous pollutants, hydrogen production, or the formation of 5-hydroxymethylfurfural (5-HMF). After the first part that was dedicated to the synthesis processes of hydrotalcites, the present review reports on specific environmental applications chosen as examples in various fields (green chemistry and depollution) that have gained increasing interest in the last decades, enlightening the links between structural properties, synthesis route, and application using lamellar materials. |
Bargaoui, Malika; Jellali, Salah; Azzaz, Ahmed Amine; Jeguirim, Mejdi; Akrout, Hanene Optimization of hybrid treatment of olive mill wastewaters through impregnation onto raw cypress sawdust and electrocoagulation. (Article de journal) Environmental science and pollution research international, 2020. @article{Bargaoui2020, title = {Optimization of hybrid treatment of olive mill wastewaters through impregnation onto raw cypress sawdust and electrocoagulation.}, author = { Malika Bargaoui and Salah Jellali and Ahmed Amine Azzaz and Mejdi Jeguirim and Hanene Akrout}, doi = {10.1007/s11356-020-08907-w}, year = {2020}, date = {2020-01-01}, journal = {Environmental science and pollution research international}, abstract = {This research investigation proposes a new method for sustainable olive mill wastewater (OMW) treatment and handling. It is based on the combination of its impregnation onto raw cypress sawdust (RCS) followed by electrocoagulation. The retention of OMW compounds onto various RCS doses show an important decrease of its chemical oxygen demand (COD) and its main cation and anion content. The maximum retention efficiencies of COD,Na+, K+, Ca2+, Mg2+, Cl-, [Formula: see text], and [Formula: see text] were about 51.0%, 75.3%, 28.7%, 77.9%, 84.7%, 41.1%, 98.3%, and 90.9%, respectively, for the highest RCS dose (200gL-1). This organic matter- and nutrient-loaded biomass could be thermochemically converted through pyrolysis into biofuel and biochar for energetic and agronomic purposes, respectively. The treatment by electrocoagulation of the pre-treated OMW using mild steel electrodes could be considered an attractive treatment method since 75.6% of COD removal efficiency was achieved. Besides, this approach permits a significant energy consumption reduction by 46% as compared with the electrocoagulation process alone. It allows also a significant improvement of the treated effluent quality in terms of both organic and mineral contents that could be reused for the irrigation of olive trees in the context of circular economy.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This research investigation proposes a new method for sustainable olive mill wastewater (OMW) treatment and handling. It is based on the combination of its impregnation onto raw cypress sawdust (RCS) followed by electrocoagulation. The retention of OMW compounds onto various RCS doses show an important decrease of its chemical oxygen demand (COD) and its main cation and anion content. The maximum retention efficiencies of COD,Na+, K+, Ca2+, Mg2+, Cl-, [Formula: see text], and [Formula: see text] were about 51.0%, 75.3%, 28.7%, 77.9%, 84.7%, 41.1%, 98.3%, and 90.9%, respectively, for the highest RCS dose (200gL-1). This organic matter- and nutrient-loaded biomass could be thermochemically converted through pyrolysis into biofuel and biochar for energetic and agronomic purposes, respectively. The treatment by electrocoagulation of the pre-treated OMW using mild steel electrodes could be considered an attractive treatment method since 75.6% of COD removal efficiency was achieved. Besides, this approach permits a significant energy consumption reduction by 46% as compared with the electrocoagulation process alone. It allows also a significant improvement of the treated effluent quality in terms of both organic and mineral contents that could be reused for the irrigation of olive trees in the context of circular economy. |
Zdiri, K; Elamri, A; Hamdaoui, M; Harzallah, O; Khenoussi, N; Brendle, J Valorization of Post-consumer PP by (Un)modified Tunisian Clay Nanoparticles Incorporation (Article de journal) Waste and Biomass Valorization, 11 (5), p. 2285–2296, 2020. @article{Zdiri2020, title = {Valorization of Post-consumer PP by (Un)modified Tunisian Clay Nanoparticles Incorporation}, author = { K. Zdiri and A. Elamri and M. Hamdaoui and O. Harzallah and N. Khenoussi and J. Brendle}, doi = {10.1007/s12649-018-0427-2}, year = {2020}, date = {2020-01-01}, journal = {Waste and Biomass Valorization}, volume = {11}, number = {5}, pages = {2285--2296}, abstract = {Modified (or unmodified) Tunisian clay nanoparticles were incorporated as nanofillers in post-consumer polypropylene (PCPP) polymer matrix in order to improve its inherent properties. PCPP loaded with Na-clay or organoclay nanocomposites were elaborated by melt intercalation method. Morphological, thermal and rheological properties of prepared nanocomposites were then evaluated. SEM observations showed better nanoparticles dispersion when PCPP was filled with organoclay compared to Na-clay. According to FTIR analysis, the increase of PCPP band intensity is much higher when using organoclay, suggesting that the nanocomposites might have more intercalation of organoclay aggregates than in the case of filled with Na-clay. Thermal gravimetric and thermal degradation analyses results confirmed that the addition of modified clay allows better thermal stability than PCPP filled with unmodified clay. This result was confirmed by DSC analysis. We deduced from the rheological analysis that PCPP storage modulus G and loss modulus G '' increased with the addition of clay nanoparticles. This increase was higher when the organo-modified clay was dispersed into the PCPP matrix, demonstrating the reinforcing effect of the latter on PCPP polymer.Graphical AbstractStorage modulus of pure PCPP and PCPP/clay nanocomposites.p id=Par}, keywords = {}, pubstate = {published}, tppubtype = {article} } Modified (or unmodified) Tunisian clay nanoparticles were incorporated as nanofillers in post-consumer polypropylene (PCPP) polymer matrix in order to improve its inherent properties. PCPP loaded with Na-clay or organoclay nanocomposites were elaborated by melt intercalation method. Morphological, thermal and rheological properties of prepared nanocomposites were then evaluated. SEM observations showed better nanoparticles dispersion when PCPP was filled with organoclay compared to Na-clay. According to FTIR analysis, the increase of PCPP band intensity is much higher when using organoclay, suggesting that the nanocomposites might have more intercalation of organoclay aggregates than in the case of filled with Na-clay. Thermal gravimetric and thermal degradation analyses results confirmed that the addition of modified clay allows better thermal stability than PCPP filled with unmodified clay. This result was confirmed by DSC analysis. We deduced from the rheological analysis that PCPP storage modulus G and loss modulus G '' increased with the addition of clay nanoparticles. This increase was higher when the organo-modified clay was dispersed into the PCPP matrix, demonstrating the reinforcing effect of the latter on PCPP polymer.Graphical AbstractStorage modulus of pure PCPP and PCPP/clay nanocomposites.p id=Par |
Villotte, Segolene; Gigmes, Didier; Dumur, Frederic; Lalevee, Jacques Design of Iodonium Salts for UV or Near-UV LEDs for Photoacid Generator and Polymerization Purposes (Article de journal) Molecules, 25 (1), p. 149, 2020. @article{Villotte2020, title = {Design of Iodonium Salts for UV or Near-UV LEDs for Photoacid Generator and Polymerization Purposes}, author = { Segolene Villotte and Didier Gigmes and Frederic Dumur and Jacques Lalevee}, doi = {10.3390/molecules25010149}, year = {2020}, date = {2020-01-01}, journal = {Molecules}, volume = {25}, number = {1}, pages = {149}, abstract = {Iodonium salts are well established photoacid generators, cationic photoinitiators, as well as additives commonly used in photoredox catalytic cycles. However, as a strong limitation, iodonium salts are characterized by low light absorption properties for lambda > 300 nm so that these latter cannot be activated with cheap, safe, and eco-friendly near UV or even visible light emitting diodes (LEDs). To overcome this drawback, the covalent linkage of an iodonium salt to a chromophore absorbing at longer wavelength is actively researched. With aim at red-shifting the absorption spectrum of the iodonium salt, the synthesis of new compounds combining within a unique chemical structure both the chromophore (here the naphthalimide scaffold) and the iodonium salt is presented. By mean of this strategy, a polymerization could be initiated at 365 nm with the modified iodonium salts whereas no polymerization could be induced with the benchmark iodonium salt i.e., Speedcure 938 at this specific wavelength. To examine the effect of the counter-anion on the photoinitiating ability of these different salts, five different counter-anions were used. Comparison between the different anions revealed the bis(trifluoromethane)sulfonimide salt to exhibit the best photoinitiating ability in both the free radical polymerization of acrylates and the cationic polymerization of epoxides. To support the experimental results, molecular orbital calculations have been carried out. By theoretical calculations, the initiating species resulting from the photocleavage of the iodonium salts could be determined. The cleavage selectivity and the photochemical reactivity of the new iodoniums are also discussed.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Iodonium salts are well established photoacid generators, cationic photoinitiators, as well as additives commonly used in photoredox catalytic cycles. However, as a strong limitation, iodonium salts are characterized by low light absorption properties for lambda > 300 nm so that these latter cannot be activated with cheap, safe, and eco-friendly near UV or even visible light emitting diodes (LEDs). To overcome this drawback, the covalent linkage of an iodonium salt to a chromophore absorbing at longer wavelength is actively researched. With aim at red-shifting the absorption spectrum of the iodonium salt, the synthesis of new compounds combining within a unique chemical structure both the chromophore (here the naphthalimide scaffold) and the iodonium salt is presented. By mean of this strategy, a polymerization could be initiated at 365 nm with the modified iodonium salts whereas no polymerization could be induced with the benchmark iodonium salt i.e., Speedcure 938 at this specific wavelength. To examine the effect of the counter-anion on the photoinitiating ability of these different salts, five different counter-anions were used. Comparison between the different anions revealed the bis(trifluoromethane)sulfonimide salt to exhibit the best photoinitiating ability in both the free radical polymerization of acrylates and the cationic polymerization of epoxides. To support the experimental results, molecular orbital calculations have been carried out. By theoretical calculations, the initiating species resulting from the photocleavage of the iodonium salts could be determined. The cleavage selectivity and the photochemical reactivity of the new iodoniums are also discussed. |
Mandeville, Jean-Claude; Perrin, Jean-Marie; Vidal, Loic Experimental hypervelocity impacts: Implication for the analysis of material retrieved after exposure to space environment (Article de journal) Acta Astronautica, 167 , p. 429–439, 2020. @article{Mandeville2020, title = {Experimental hypervelocity impacts: Implication for the analysis of material retrieved after exposure to space environment}, author = { Jean-Claude Mandeville and Jean-Marie Perrin and Loic Vidal}, doi = {10.1016/j.actaastro.2019.11.020}, year = {2020}, date = {2020-01-01}, journal = {Acta Astronautica}, volume = {167}, pages = {429--439}, abstract = {During the last three decades a wide variety of surfaces have been brought back to Earth after being exposed to the space particulate environment. The impact features found on these surfaces can give clues to the characteristics of the orbital debris and meteoroids that created them. Many investigations have been carried out to derive projectile parameters (size, shape, impact angle, origin) from the morphology of impact features and the analysis of projectile their remnants inside the crater. However, there are still some ambiguities in the interpretation of these results. In this study we have investigated carefully the distinguishing features for craters caused by the impact of high velocity iron particles on thick brittle targets, using a micro-particle accelerator. Up to date instrumentation, SEM and EDX, and in depth results analysis provides an extensive data-set that can be used to improve the scientific return of the investigation of material retrieved after exposure to space.}, keywords = {}, pubstate = {published}, tppubtype = {article} } During the last three decades a wide variety of surfaces have been brought back to Earth after being exposed to the space particulate environment. The impact features found on these surfaces can give clues to the characteristics of the orbital debris and meteoroids that created them. Many investigations have been carried out to derive projectile parameters (size, shape, impact angle, origin) from the morphology of impact features and the analysis of projectile their remnants inside the crater. However, there are still some ambiguities in the interpretation of these results. In this study we have investigated carefully the distinguishing features for craters caused by the impact of high velocity iron particles on thick brittle targets, using a micro-particle accelerator. Up to date instrumentation, SEM and EDX, and in depth results analysis provides an extensive data-set that can be used to improve the scientific return of the investigation of material retrieved after exposure to space. |
Cesario, Moises; Schobing, Julie; Bruder, Florian; Dorge, Sophie; Nouali, Habiba; Habermacher, David; Kerdoncuff, Pierre; Vierling, Matthieu; Moliere, Michel; Brilhac, Jean-Francois; Patarin, Joel Impact of bentonite content on the structural, textural and mechanical properties of SBA-15 mesoporous silica beads (Article de journal) Journal of Porous Materials, 2020. @article{Cesario2020, title = {Impact of bentonite content on the structural, textural and mechanical properties of SBA-15 mesoporous silica beads}, author = { Moises Cesario and Julie Schobing and Florian Bruder and Sophie Dorge and Habiba Nouali and David Habermacher and Pierre Kerdoncuff and Matthieu Vierling and Michel Moliere and Jean-Francois Brilhac and Joel Patarin}, doi = {10.1007/s10934-020-00865-5}, year = {2020}, date = {2020-01-01}, journal = {Journal of Porous Materials}, abstract = {This work aims to evaluate the impact of bentonite content on the structural, textural and mechanical properties of SBA-15 beads prepared by shearing using an Eirich mixer. X-Ray Diffraction analysis (XRD) of conventional and sheared SBA-15 powders and bentonite-containing beads confirms the attainment of hexagonal structure. According to the nitrogen adsorption-desorption isotherms, the bentonite content has a significant impact on mesoporous volume. SBA-15 beads containing 9.1 wt% of bentonite (B-SBA-Be9), 16.7 wt% of bentonite (B-SBA-Be17) and 33.3 wt% of bentonite (B-SBA-Be33) showed an increase in mesoporous volume of 15, 25 and 20%, respectively. Indeed, the presence of the basic bentonite-water solution during the preparation stage of the beads generates a chemical attack of the SBA-15 walls that leads to the increase in the mesopores size. Beads containing 16.7 wt% of bentonite present more promising result in relation to their good balance between textural properties and mechanical strength. Thus, this sample could be used for a future application as a catalyst support for desulfurization process. Therefore, these results confirm that porosity and mechanical resistance are strongly dependent on the bentonite content and beads preparation process, in comparison to literature data.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This work aims to evaluate the impact of bentonite content on the structural, textural and mechanical properties of SBA-15 beads prepared by shearing using an Eirich mixer. X-Ray Diffraction analysis (XRD) of conventional and sheared SBA-15 powders and bentonite-containing beads confirms the attainment of hexagonal structure. According to the nitrogen adsorption-desorption isotherms, the bentonite content has a significant impact on mesoporous volume. SBA-15 beads containing 9.1 wt% of bentonite (B-SBA-Be9), 16.7 wt% of bentonite (B-SBA-Be17) and 33.3 wt% of bentonite (B-SBA-Be33) showed an increase in mesoporous volume of 15, 25 and 20%, respectively. Indeed, the presence of the basic bentonite-water solution during the preparation stage of the beads generates a chemical attack of the SBA-15 walls that leads to the increase in the mesopores size. Beads containing 16.7 wt% of bentonite present more promising result in relation to their good balance between textural properties and mechanical strength. Thus, this sample could be used for a future application as a catalyst support for desulfurization process. Therefore, these results confirm that porosity and mechanical resistance are strongly dependent on the bentonite content and beads preparation process, in comparison to literature data. |
Khiari, B; Ferjani, Ibn A; Azzaz, A A; Jellali, S; Limousy, L; Jeguirim, M Thermal conversion of flax shives through slow pyrolysis process: in-depth biochar characterization and future potential use (Article de journal) Biomass Conversion and Biorefinery, 2020. @article{Khiari2020a, title = {Thermal conversion of flax shives through slow pyrolysis process: in-depth biochar characterization and future potential use}, author = { B. Khiari and A. Ibn Ferjani and A. A. Azzaz and S. Jellali and L. Limousy and M. Jeguirim}, doi = {10.1007/s13399-020-00641-0}, year = {2020}, date = {2020-01-01}, journal = {Biomass Conversion and Biorefinery}, abstract = {In this paper, the potential of flax shives use as sustainable materials for environmental and energy applications is assessed. In particular, raw flax shives and their pyrolytic chars produced at three different temperatures (400, 500, and 600 degrees C) are fully characterized using several analytical techniques including thermogravimetric analysis (TGA), X-ray fluorescence (XRF), scanning electronic microscopy (SEM), CO2 adsorption, Raman spectroscopy, and DRIFT (diffuse reflectance infrared Fourier transform) spectroscopy. Furthermore, thermogravimetric analyses and their derivative (TGA/DTG) during the thermal degradation of the flax shives were used to deduce the corresponding kinetic data. These latter were calculated using three different models: Friedman, Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS). The main results indicate that the raw flax shives have high potential in co-firing, which is very close to usual energy vectors in some rural contexts and even more enhanced compared to many other biomasses used in industrial fields. They can also be an attractive carbon source for agricultural soils. Furthermore, the chars derived from flax shives contain important rates of mineral species such as calcium, potassium, magnesium, and phosphorous, which allow their reuse as low-cost amendments for agricultural soils. At the same time, the surface area and the microporous structure of the flax shives biochars are developed enough allowing them to be used as effective adsorbents for pollutants contained in gaseous phase. After an activation step, these biochars' physico-chemical properties could be significantly improved permitting their application as promising materials for soil bioremediation or wastewater treatment.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, the potential of flax shives use as sustainable materials for environmental and energy applications is assessed. In particular, raw flax shives and their pyrolytic chars produced at three different temperatures (400, 500, and 600 degrees C) are fully characterized using several analytical techniques including thermogravimetric analysis (TGA), X-ray fluorescence (XRF), scanning electronic microscopy (SEM), CO2 adsorption, Raman spectroscopy, and DRIFT (diffuse reflectance infrared Fourier transform) spectroscopy. Furthermore, thermogravimetric analyses and their derivative (TGA/DTG) during the thermal degradation of the flax shives were used to deduce the corresponding kinetic data. These latter were calculated using three different models: Friedman, Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS). The main results indicate that the raw flax shives have high potential in co-firing, which is very close to usual energy vectors in some rural contexts and even more enhanced compared to many other biomasses used in industrial fields. They can also be an attractive carbon source for agricultural soils. Furthermore, the chars derived from flax shives contain important rates of mineral species such as calcium, potassium, magnesium, and phosphorous, which allow their reuse as low-cost amendments for agricultural soils. At the same time, the surface area and the microporous structure of the flax shives biochars are developed enough allowing them to be used as effective adsorbents for pollutants contained in gaseous phase. After an activation step, these biochars' physico-chemical properties could be significantly improved permitting their application as promising materials for soil bioremediation or wastewater treatment. |
Li, Hu; Duan, Tianbo; Haldar, Soumyajyoti; Sanyal, Biplab; Eriksson, Olle; Jafri, Hassan; Hajjar-Garreau, Samar; Simon, Laurent; Leifer, Klaus Direct writing of lateral fluorographene nanopatterns with tunable bandgaps and its application in new generation of moire superlattice (Article de journal) Applied Physics Reviews, 7 (1), p. 011403, 2020. @article{Li2020, title = {Direct writing of lateral fluorographene nanopatterns with tunable bandgaps and its application in new generation of moire superlattice}, author = { Hu Li and Tianbo Duan and Soumyajyoti Haldar and Biplab Sanyal and Olle Eriksson and Hassan Jafri and Samar Hajjar-Garreau and Laurent Simon and Klaus Leifer}, doi = {10.1063/1.5129948}, year = {2020}, date = {2020-01-01}, journal = {Applied Physics Reviews}, volume = {7}, number = {1}, pages = {011403}, abstract = {One of the primary goals for monolayer device fabrications and an ideal model of graphene as an atomic thin "canvas" is one that permits semiconducting/insulating lateral nanopatterns to be freely and directly drawn on the semimetallic graphene surface. This work demonstrates a reversible electron-beam-activated technique that allows direct writing of semiconducting/insulating fluorographene lateral nanopatterns with tunable bandgaps on the graphene surface with a resolution down to 9-15 nm. This approach overcomes the conventional limit of semiconducting C4F in the single-sided fluorination of supported graphene and achieves insulating C2F. Moreover, applying this technique on bilayer graphene demonstrates for the first time a new type of rectangular moire pattern arising from the generated C2F boat/graphene superlattice. This novel technique constitutes a new approach to fabricating graphene-based flexible and transparent electronic nanodevices with the CxF channels utilized as semiconducting or insulating counterparts, and also opens a route toward the tailoring and engineering of electronic properties of such materials in addition to the dominating triangular moire patterns from a graphene/hBN system.}, keywords = {}, pubstate = {published}, tppubtype = {article} } One of the primary goals for monolayer device fabrications and an ideal model of graphene as an atomic thin "canvas" is one that permits semiconducting/insulating lateral nanopatterns to be freely and directly drawn on the semimetallic graphene surface. This work demonstrates a reversible electron-beam-activated technique that allows direct writing of semiconducting/insulating fluorographene lateral nanopatterns with tunable bandgaps on the graphene surface with a resolution down to 9-15 nm. This approach overcomes the conventional limit of semiconducting C4F in the single-sided fluorination of supported graphene and achieves insulating C2F. Moreover, applying this technique on bilayer graphene demonstrates for the first time a new type of rectangular moire pattern arising from the generated C2F boat/graphene superlattice. This novel technique constitutes a new approach to fabricating graphene-based flexible and transparent electronic nanodevices with the CxF channels utilized as semiconducting or insulating counterparts, and also opens a route toward the tailoring and engineering of electronic properties of such materials in addition to the dominating triangular moire patterns from a graphene/hBN system. |
Miron, Mélania Etude des interactions protéines – surfaces : Influence des conditions hydrodynamiques et physiques (Thèse de doctorat) 2020. (BibTeX) @phdthesis{Miron2020, title = {Etude des interactions protéines – surfaces : Influence des conditions hydrodynamiques et physiques}, author = { Mélania Miron}, year = {2020}, date = {2020-01-01}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } |
Kawthar, Frikha Synthèse de catalyseurs d'oxydes métalliques par la méthode de combustion en solution assistée par micro-ondes (Thèse de doctorat) ed, 2020. @phdthesis{Kawthar2020, title = {Synthèse de catalyseurs d'oxydes métalliques par la méthode de combustion en solution assistée par micro-ondes}, author = { Frikha Kawthar}, year = {2020}, date = {2020-01-01}, school = {ed}, abstract = {Synthèse de catalyseurs d’oxydes métalliques par la méthode de combustion en solution assistée par micro-ondes Les oxydes métalliques font partie des matériaux catalytiques les plus employés en catalyse hétérogène. Les méthodes conventionnelles utilisées pour la préparation de catalyseurs à base d’oxydes métalliques nécessitent de nombreuses étapes de synthèse, des équipements spéciaux et des protocoles de préparation fortement énergivores et chronophages, ce qui a poussé les chercheurs à développer des méthodes de synthèse innovantes et durables. La synthèse par combustion assistée par micro-ondes s’est récemment montrée comme l'une des voies de synthèse les plus prometteuses étant une approche simple et rapide. Ce projet de thèse s’intéresse à préparer des catalyseurs à base d’oxyde métallique par la méthode de combustion en solution assistée par micro-ondes pour l'élimination du monoxyde de carbone. Dans cette étude, des catalyseurs à base d’oxyde binaire et ternaire ont été préparés en un temps de réaction très court sous irradiation micro-ondes à partir de la combustion d’une solution aqueuse de nitrates métalliques et d’urée. Plusieurs facteurs expérimentaux tels que le précurseur métallique, la stoechiométrie des réactifs et la charge métallique ont été variés et étudiés. Une séquence de caractérisations multi-échelle a été réalisée afin d'identifier la corrélation entre les propriétés physico-chimiques des catalyseurs et leurs activités catalytiques pour l’oxydation du CO. Les aluminates de cobalt et les aluminates de nickel étaient principalement les phases formées dans contenant du Ni ou du Co, tandis que les phases CuO et α-Al2O3 ont été détectées dans les catalyseurs contenant du cuivre. La stoechiométrie et la charge métallique peuvent jouer un rôle critique dans le contrôle de la composition de phase et de la composition chimique de surface. Les catalyseurs contenant du cuivre présentaient une activité catalytique élevée à basse température pour l’oxydation du CO, tandis que les catalyseurs contenant du nickel et du cobalt montraient une activité relativement faible à basse température. Le degré d’interaction entre l’oxyde métallique et l’alumine affecte la composition chimique de la masse et de la surface, les propriétés structurelles et la dispersion des sites actifs , qui, à leur tour, affectent l'activité catalytique.}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } Synthèse de catalyseurs d’oxydes métalliques par la méthode de combustion en solution assistée par micro-ondes Les oxydes métalliques font partie des matériaux catalytiques les plus employés en catalyse hétérogène. Les méthodes conventionnelles utilisées pour la préparation de catalyseurs à base d’oxydes métalliques nécessitent de nombreuses étapes de synthèse, des équipements spéciaux et des protocoles de préparation fortement énergivores et chronophages, ce qui a poussé les chercheurs à développer des méthodes de synthèse innovantes et durables. La synthèse par combustion assistée par micro-ondes s’est récemment montrée comme l'une des voies de synthèse les plus prometteuses étant une approche simple et rapide. Ce projet de thèse s’intéresse à préparer des catalyseurs à base d’oxyde métallique par la méthode de combustion en solution assistée par micro-ondes pour l'élimination du monoxyde de carbone. Dans cette étude, des catalyseurs à base d’oxyde binaire et ternaire ont été préparés en un temps de réaction très court sous irradiation micro-ondes à partir de la combustion d’une solution aqueuse de nitrates métalliques et d’urée. Plusieurs facteurs expérimentaux tels que le précurseur métallique, la stoechiométrie des réactifs et la charge métallique ont été variés et étudiés. Une séquence de caractérisations multi-échelle a été réalisée afin d'identifier la corrélation entre les propriétés physico-chimiques des catalyseurs et leurs activités catalytiques pour l’oxydation du CO. Les aluminates de cobalt et les aluminates de nickel étaient principalement les phases formées dans contenant du Ni ou du Co, tandis que les phases CuO et α-Al2O3 ont été détectées dans les catalyseurs contenant du cuivre. La stoechiométrie et la charge métallique peuvent jouer un rôle critique dans le contrôle de la composition de phase et de la composition chimique de surface. Les catalyseurs contenant du cuivre présentaient une activité catalytique élevée à basse température pour l’oxydation du CO, tandis que les catalyseurs contenant du nickel et du cobalt montraient une activité relativement faible à basse température. Le degré d’interaction entre l’oxyde métallique et l’alumine affecte la composition chimique de la masse et de la surface, les propriétés structurelles et la dispersion des sites actifs , qui, à leur tour, affectent l'activité catalytique. |
Tahraoui, Zakaria; Nouali, Habiba; Marichal, Claire; Forler, Patrice; Klein, Julien; Daou, Jean T Influence of the Compensating Cation Nature on the Water Adsorption Properties of Zeolites. (Article de journal) Molecules (Basel, Switzerland), 25 (4), 2020. @article{Tahraoui2020, title = {Influence of the Compensating Cation Nature on the Water Adsorption Properties of Zeolites.}, author = { Zakaria Tahraoui and Habiba Nouali and Claire Marichal and Patrice Forler and Julien Klein and T. Jean Daou}, doi = {10.3390/molecules25040944}, year = {2020}, date = {2020-01-01}, journal = {Molecules (Basel, Switzerland)}, volume = {25}, number = {4}, abstract = {The influence of the compensating cation (Na+, Li+, Mg2+) nature on the water adsorption properties of LTA and FAU-type zeolites was investigated. Cation exchanges were performed at 80 °C for 2 h using 1 M aqueous solutions of lithium chloride (LiCl) or magnesium chloride (MgCl2). XRF and ICP-OES analyses indicate that the cation exchange yields reach values between 59 to 89% depending on the number of exchange cycles and the nature of the zeolite and cation, while both zeolites structures are preserved during the process, as shown by XRD and solid state NMR analyses. Nitrogen adsorption-desorption experiments indicate a higher available microporous volume when sodium cations are replaced by smaller monovalent lithium cations or by divalent magnesium cations because twice less cations are needed compared to monovalent cations. Up to 15% of gain in the available microporous volume is obtained for FAU-type zeolites exchanged with magnesium cation. This improvement facilitates the adsorption of water with an increase in the water uptake up to 30% for the LTA and FAU type zeolites exchanged with magnesium. These exchanged zeolites are promising for uses in water decontamination because a smaller amount is needed to trap the same amount of water compared to their sodium counterparts.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The influence of the compensating cation (Na+, Li+, Mg2+) nature on the water adsorption properties of LTA and FAU-type zeolites was investigated. Cation exchanges were performed at 80 °C for 2 h using 1 M aqueous solutions of lithium chloride (LiCl) or magnesium chloride (MgCl2). XRF and ICP-OES analyses indicate that the cation exchange yields reach values between 59 to 89% depending on the number of exchange cycles and the nature of the zeolite and cation, while both zeolites structures are preserved during the process, as shown by XRD and solid state NMR analyses. Nitrogen adsorption-desorption experiments indicate a higher available microporous volume when sodium cations are replaced by smaller monovalent lithium cations or by divalent magnesium cations because twice less cations are needed compared to monovalent cations. Up to 15% of gain in the available microporous volume is obtained for FAU-type zeolites exchanged with magnesium cation. This improvement facilitates the adsorption of water with an increase in the water uptake up to 30% for the LTA and FAU type zeolites exchanged with magnesium. These exchanged zeolites are promising for uses in water decontamination because a smaller amount is needed to trap the same amount of water compared to their sodium counterparts. |
Sauvage, Jean-Baptiste; Chalandon, Pierre; Poquillon, Dominique; Nardin, Michel; Aufray, Maelenn Using the Finite Element Analysis Method to Study the 3-point Bending Test for the Characterization of the Adherence (Article de journal) Journal of Applied and Computational Mechanics, 6 (3), p. 505–516, 2020. @article{Sauvage2020, title = {Using the Finite Element Analysis Method to Study the 3-point Bending Test for the Characterization of the Adherence}, author = { Jean-Baptiste Sauvage and Pierre Chalandon and Dominique Poquillon and Michel Nardin and Maelenn Aufray}, doi = {10.22055/JACM.2019.30337.1718}, year = {2020}, date = {2020-01-01}, journal = {Journal of Applied and Computational Mechanics}, volume = {6}, number = {3}, pages = {505--516}, abstract = {An elastic finite element analysis was conducted to evaluate the stress distribution in the initiation zone of the adhesive rupture during the 3-point bending test. This test is used to measure the adherence between a polyepoxy adhesive and aluminum alloy with different surface treatments. The purpose is to compare, in the high stress concentration areas, the stress fields calculated using finite element method with the experimental data obtained in different configurations. Focusing on the load level at crack initiation, on the localization and the size of adhesive failure initiation, a local criterion for adhesive fracture is proposed based on the value of the stress normal to the interface.}, keywords = {}, pubstate = {published}, tppubtype = {article} } An elastic finite element analysis was conducted to evaluate the stress distribution in the initiation zone of the adhesive rupture during the 3-point bending test. This test is used to measure the adherence between a polyepoxy adhesive and aluminum alloy with different surface treatments. The purpose is to compare, in the high stress concentration areas, the stress fields calculated using finite element method with the experimental data obtained in different configurations. Focusing on the load level at crack initiation, on the localization and the size of adhesive failure initiation, a local criterion for adhesive fracture is proposed based on the value of the stress normal to the interface. |
S., Aleid Ghadah Mohammad; Khoerunnisa, Fitri; Rigolet, Severinne; Daou, Jean T; Ling, Tau-Chuan; Ng, Eng-Poh Hierarchical Cs–Pollucite Nanozeolite Modified with Novel Organosilane as an Excellent Solid Base Catalyst for Claisen–Schmidt Condensation of Benzaldehyde and Acetophenone (Article de journal) Processes, 8 (1), p. 96, 2020. @article{AleidGhadahMohammad2020, title = {Hierarchical Cs–Pollucite Nanozeolite Modified with Novel Organosilane as an Excellent Solid Base Catalyst for Claisen–Schmidt Condensation of Benzaldehyde and Acetophenone}, author = { Aleid Ghadah Mohammad S. and Fitri Khoerunnisa and Severinne Rigolet and T. Jean Daou and Tau-Chuan Ling and Eng-Poh Ng}, doi = {10.3390/pr8010096}, year = {2020}, date = {2020-01-01}, journal = {Processes}, volume = {8}, number = {1}, pages = {96}, publisher = {MDPI AG}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Todorova, S; Blin, J L; Naydenov, A; Lebeau, B; Karashanova, D; Kolev, H; Gaudin, P; Velinova, R; Vidal, L; Michelin, L; Josien, L; Filkova, D; Ivanova, I; Dotzeva, A; Tenchev, K Co-Mn oxides supported on hierarchical macro-mesoporous silica for CO and VOCs oxidation (Article de journal) Catalysis Today, 2020. @article{Todorova2020, title = {Co-Mn oxides supported on hierarchical macro-mesoporous silica for CO and VOCs oxidation}, author = { S. Todorova and J.L. Blin and A. Naydenov and B. Lebeau and D. Karashanova and H. Kolev and P. Gaudin and R. Velinova and L. Vidal and L. Michelin and L. Josien and D. Filkova and I. Ivanova and A. Dotzeva and K. Tenchev}, doi = {10.1016/j.cattod.2020.01.019}, year = {2020}, date = {2020-01-01}, journal = {Catalysis Today}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Confalonieri, Giorgia; Ryzhikov, Andrey; Arletti, Rossella; Quartieri, Simona; Vezzalini, Giovanna; Isaac, Carole; Paillaud, Jean-Louis; Nouali, Habiba; Daou, Jean T Structural interpretation of the energetic performances of Pure Silica LTA-type Zeolite (Article de journal) Physical Chemistry Chemical Physics, 2020. @article{Confalonieri2020, title = {Structural interpretation of the energetic performances of Pure Silica LTA-type Zeolite}, author = { Giorgia Confalonieri and Andrey Ryzhikov and Rossella Arletti and Simona Quartieri and Giovanna Vezzalini and Carole Isaac and Jean-Louis Paillaud and Habiba Nouali and T. Jean Daou}, doi = {10.1039/c9cp06760d}, year = {2020}, date = {2020-01-01}, journal = {Physical Chemistry Chemical Physics}, publisher = {Royal Society of Chemistry (RSC)}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tasdelen, Mehmet Atilla; Lalevée, Jacques; Yagci, Yusuf Photoinduced free radical promoted cationic polymerization 40 years after its discovery (Article de journal) Polymer Chemistry, 11 (6), p. 1111–1121, 2020. @article{Tasdelen2020, title = {Photoinduced free radical promoted cationic polymerization 40 years after its discovery}, author = { Mehmet Atilla Tasdelen and Jacques Lalevée and Yusuf Yagci}, doi = {10.1039/c9py01903k}, year = {2020}, date = {2020-01-01}, journal = {Polymer Chemistry}, volume = {11}, number = {6}, pages = {1111--1121}, publisher = {Royal Society of Chemistry (RSC)}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Riikonen, Joakim; Nissinen, Tuomo; Alanne, Aino; Thapa, Rinez; Fioux, Philippe; Bonne, Magali; Rigolet, Séverinne; Morlet-Savary, Fabrice; Aussenac, Fabien; Marichal, Claire; Lalevée, Jacques; Vepsäläinen, Jouko; Lebeau, Bénédicte; Lehto, Vesa-Pekka Stable surface functionalization of carbonized mesoporous silicon (Article de journal) Inorganic Chemistry Frontiers, 7 (3), p. 631–641, 2020. @article{Riikonen2020, title = {Stable surface functionalization of carbonized mesoporous silicon}, author = { Joakim Riikonen and Tuomo Nissinen and Aino Alanne and Rinez Thapa and Philippe Fioux and Magali Bonne and Séverinne Rigolet and Fabrice Morlet-Savary and Fabien Aussenac and Claire Marichal and Jacques Lalevée and Jouko Vepsäläinen and Bénédicte Lebeau and Vesa-Pekka Lehto}, doi = {10.1039/c9qi01140d}, year = {2020}, date = {2020-01-01}, journal = {Inorganic Chemistry Frontiers}, volume = {7}, number = {3}, pages = {631--641}, publisher = {Royal Society of Chemistry (RSC)}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
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