Nos publications
2019 |
Dutournie, Patrick; Deon, Sebastien; Limousy, Lionel Understanding the separation of anion mixtures by TiO2 membranes: Numerical investigation and effect of alkaline treatment on physicochemical properties (Article de journal) Chemical Engineering Journal, 363 , p. 365–373, 2019. @article{Dutournie2019, title = {Understanding the separation of anion mixtures by TiO2 membranes: Numerical investigation and effect of alkaline treatment on physicochemical properties}, author = { Patrick Dutournie and Sebastien Deon and Lionel Limousy}, doi = {10.1016/j.cej.2019.01.116}, year = {2019}, date = {2019-05-01}, journal = {Chemical Engineering Journal}, volume = {363}, pages = {365--373}, abstract = {Mechanisms governing the rejection of ions from multi-ionic solutions, and especially the selectivity between various anions are not fully understood at the present time. In this study, it is proposed, in a first part, to investigate the evolution of electric and dielectric exclusion mechanisms when anions are mixed in a solution. For this purpose, the volumetric membrane charge X-d and the dielectric constant of the solution confined within pores epsilon(p) are numerically assessed from rejection curves with a classic transport model. This study highlights that the rejection of the various anions is differently governed by electric and dielectric mechanisms but their contribution to mixture separation seems to be proportionally impacted by the solutions mixed. It was for instance demonstrated that the couple (epsilon(p), X-d) obtained with the ternary salt mixture (NaF-NaI-Na2SO4) corresponds to the barycenter of the triangle made by the couples of the three corresponding binary salt mixtures (i.e. NaF-NaI, NaF-Na2SO4 and NaI-Na2SO4). In a second part, the influence of a mild alkaline treatment, consisting in the filtration of a sodium carbonate solution, is investigated from the variation in membrane charge and dielectric constant assessed from ion mixtures. It is shown that the alkaline treatment mostly diminishes dielectric exclusion through a notable increase in dielectric constant inside pores when solution contains fluoride ion. Membrane charge estimated with solutions containing fluoride ion was found to be slightly impacted, but differently depending on the other anions in solution. Finally, exclusion mechanisms are found to be weak and unaffected by the treatment when solution does not contain fluoride ion.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Mechanisms governing the rejection of ions from multi-ionic solutions, and especially the selectivity between various anions are not fully understood at the present time. In this study, it is proposed, in a first part, to investigate the evolution of electric and dielectric exclusion mechanisms when anions are mixed in a solution. For this purpose, the volumetric membrane charge X-d and the dielectric constant of the solution confined within pores epsilon(p) are numerically assessed from rejection curves with a classic transport model. This study highlights that the rejection of the various anions is differently governed by electric and dielectric mechanisms but their contribution to mixture separation seems to be proportionally impacted by the solutions mixed. It was for instance demonstrated that the couple (epsilon(p), X-d) obtained with the ternary salt mixture (NaF-NaI-Na2SO4) corresponds to the barycenter of the triangle made by the couples of the three corresponding binary salt mixtures (i.e. NaF-NaI, NaF-Na2SO4 and NaI-Na2SO4). In a second part, the influence of a mild alkaline treatment, consisting in the filtration of a sodium carbonate solution, is investigated from the variation in membrane charge and dielectric constant assessed from ion mixtures. It is shown that the alkaline treatment mostly diminishes dielectric exclusion through a notable increase in dielectric constant inside pores when solution contains fluoride ion. Membrane charge estimated with solutions containing fluoride ion was found to be slightly impacted, but differently depending on the other anions in solution. Finally, exclusion mechanisms are found to be weak and unaffected by the treatment when solution does not contain fluoride ion. |
Deon, Sebastien; Koubaa, Zakaryae; Korzhova, Elizaveta; Airoudj, Aissam; Fievet, Patrick; Roucoules, Vincent Understanding the impact of poly(allylamine) plasma grafting on the filtration performances of a commercial polymeric membrane (Article de journal) Separation and Purification Technology, 212 , p. 30–39, 2019. @article{Deon2019, title = {Understanding the impact of poly(allylamine) plasma grafting on the filtration performances of a commercial polymeric membrane}, author = { Sebastien Deon and Zakaryae Koubaa and Elizaveta Korzhova and Aissam Airoudj and Patrick Fievet and Vincent Roucoules}, doi = {10.1016/j.seppur.2018.11.004}, year = {2019}, date = {2019-04-01}, journal = {Separation and Purification Technology}, volume = {212}, pages = {30--39}, abstract = {Commercial membranes often exhibit difficulties in rejecting specific ionic species, and especially multivalent cations, due to their usual negative charge. To face this drawback, it is proposed here to functionalize the membrane surface by allylamine plasma polymerization. The impact of this modification on both permeation flux and ion rejection is investigated for single salt solutions and ion mixtures. It is shown that the membrane behaves like a positive membrane from the point of view of cation rejection but the negative charge (and the corresponding electrical field) inside pores leads to high rejection of divalent anions like a negative membrane. This allows a high selectivity between divalent and monovalent ions irrespective of their sign. However, in the cases of ionic mixtures, the selectivity between cations and anions is reduced as the grafting duration increases. This outstanding impact on performances was obtained although the membrane surface is perhaps partially covered by plasma poly(allylamine). Indeed, the overall apparent zeta-potential was found to be still slightly negative or slightly positive for 5 and 10 min of polymerization, respectively. Consequently, a definitive conclusion about the mechanisms governing the impact of grafting on rejection cannot still be drawn and it requires an in-depth characterization of the membrane before and after modification so as to consider the changes in physicochemical properties induced by poly(allylamine) grafting.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Commercial membranes often exhibit difficulties in rejecting specific ionic species, and especially multivalent cations, due to their usual negative charge. To face this drawback, it is proposed here to functionalize the membrane surface by allylamine plasma polymerization. The impact of this modification on both permeation flux and ion rejection is investigated for single salt solutions and ion mixtures. It is shown that the membrane behaves like a positive membrane from the point of view of cation rejection but the negative charge (and the corresponding electrical field) inside pores leads to high rejection of divalent anions like a negative membrane. This allows a high selectivity between divalent and monovalent ions irrespective of their sign. However, in the cases of ionic mixtures, the selectivity between cations and anions is reduced as the grafting duration increases. This outstanding impact on performances was obtained although the membrane surface is perhaps partially covered by plasma poly(allylamine). Indeed, the overall apparent zeta-potential was found to be still slightly negative or slightly positive for 5 and 10 min of polymerization, respectively. Consequently, a definitive conclusion about the mechanisms governing the impact of grafting on rejection cannot still be drawn and it requires an in-depth characterization of the membrane before and after modification so as to consider the changes in physicochemical properties induced by poly(allylamine) grafting. |
Zazou, Hicham; Afanga, Hanane; Akhouairi, Siham; Ouchtak, Hassan; Addi, Abdelaziz Ait; Akbour, Rachid Ait; Assabbane, Ali; Douch, Jamaa; Elmchaouri, Abdellah; Duplay, Joelle; Jada, Amane; Hamdani, Mohamed Treatment of textile industry wastewater by electrocoagulation coupled with electrochemical advanced oxidation process (Article de journal) Journal of Water Process Engineering, 28 , p. 214–221, 2019. @article{Zazou2019, title = {Treatment of textile industry wastewater by electrocoagulation coupled with electrochemical advanced oxidation process}, author = { Hicham Zazou and Hanane Afanga and Siham Akhouairi and Hassan Ouchtak and Abdelaziz Ait Addi and Rachid Ait Akbour and Ali Assabbane and Jamaa Douch and Abdellah Elmchaouri and Joelle Duplay and Amane Jada and Mohamed Hamdani}, doi = {10.1016/j.jwpe.2019.02.006}, year = {2019}, date = {2019-04-01}, journal = {Journal of Water Process Engineering}, volume = {28}, pages = {214--221}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Eren, Tugce Nur; Graff, Bernadette; Lalevee, Jacques; Avci, Duygu Thioxanthone-functionalized 1,6-heptadiene as monomeric photoinitiator (Article de journal) Progress in Organic Coatings, 128 , p. 148–156, 2019. @article{Eren2019, title = {Thioxanthone-functionalized 1,6-heptadiene as monomeric photoinitiator}, author = { Tugce Nur Eren and Bernadette Graff and Jacques Lalevee and Duygu Avci}, doi = {10.1016/j.porgcoat.2018.12.014}, year = {2019}, date = {2019-03-01}, journal = {Progress in Organic Coatings}, volume = {128}, pages = {148--156}, abstract = {The synthesis of the first photoinitiator (PI) based on thioxanthone (TX) with 1,6-heptadiene structure is described. This PI (TXdMA) absorbs in the near UV-vis region (435-439 rim; with absorption redshift approximate to 50 nm and e values comparable to TX). Photopolymerization results demonstrate that although TXdMA is not an effective one-component polymerizable photoinitiator, it can successfully initiate photopolymerization of poly(ethylene glycol) diacrylate (PEGDA}, keywords = {}, pubstate = {published}, tppubtype = {article} } The synthesis of the first photoinitiator (PI) based on thioxanthone (TX) with 1,6-heptadiene structure is described. This PI (TXdMA) absorbs in the near UV-vis region (435-439 rim; with absorption redshift approximate to 50 nm and e values comparable to TX). Photopolymerization results demonstrate that although TXdMA is not an effective one-component polymerizable photoinitiator, it can successfully initiate photopolymerization of poly(ethylene glycol) diacrylate (PEGDA |
Ay, Emel; Gerard, Violaine; Graff, Bernadette; Morlet-Savary, Fabrice; Mutilangi, William; Galopin, Christophe; Lalevee, Jacques Citral Photodegradation in Solution: Highlighting of a Radical Pathway in Parallel to Cyclization Pathway. (Article de journal) Journal of agricultural and food chemistry, 2019. @article{Ay2019, title = {Citral Photodegradation in Solution: Highlighting of a Radical Pathway in Parallel to Cyclization Pathway.}, author = { Emel Ay and Violaine Gerard and Bernadette Graff and Fabrice Morlet-Savary and William Mutilangi and Christophe Galopin and Jacques Lalevee}, doi = {10.1021/acs.jafc.8b07034}, year = {2019}, date = {2019-03-01}, journal = {Journal of agricultural and food chemistry}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Vauthier, Madeline; Jierry, Loic; Oliveira, Jamerson Carneiro; Hassouna, Lilia; Roucoules, Vincent; Gall, Florence Bally-Le Interfacial Thermoreversible Chemistry on Functional Coatings: A Focus on the Diels-Alder Reaction (Article de journal) Advanced Functional Materials, 29 (10), p. 1806765, 2019. @article{Vauthier2019a, title = {Interfacial Thermoreversible Chemistry on Functional Coatings: A Focus on the Diels-Alder Reaction}, author = { Madeline Vauthier and Loic Jierry and Jamerson Carneiro Oliveira and Lilia Hassouna and Vincent Roucoules and Florence Bally-Le Gall}, doi = {10.1002/adfm.201806765}, year = {2019}, date = {2019-03-01}, journal = {Advanced Functional Materials}, volume = {29}, number = {10}, pages = {1806765}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Khiari, Besma; Moussaoui, Marwa; Jeguirim, Mejdi Tomato-Processing By-Product Combustion: Thermal and Kinetic Analyses. (Article de journal) Materials (Basel, Switzerland), 12 (4), 2019. @article{Khiari2019a, title = {Tomato-Processing By-Product Combustion: Thermal and Kinetic Analyses.}, author = { Besma Khiari and Marwa Moussaoui and Mejdi Jeguirim}, doi = {10.3390/ma12040553}, year = {2019}, date = {2019-02-01}, journal = {Materials (Basel, Switzerland)}, volume = {12}, number = {4}, abstract = {This paper is part of a sustainable development approach, the aim being to develop a thermochemical energy recovery path while reducing the amount of tomato waste issued from agro-industrial units. The thermal process may contribute to an environmentally friendly management and help tomato processing industries creating new economic profitable circuits in an increasingly competitive context. The adopted approach was to follow the operating conditions needed for a complete thermal degradation through a thermal and kinetic analyses. The results of the tomato waste characterization confirmed their suitability to a thermochemical processing with high volatiles and fixed carbon and interesting high heating values comparable to sawdust biomass. We were able to isolate of the decomposition domains and extract kinetic parameters. Three kinetic models were applied; Flynn⁻Wall⁻Ozawa (FWO) simulated the best the combustion process. Calculated curves were validated by the first order (n = 1) model except for the slow heating rate of 5 °C/min which was fitted by the contracted cylinder model. The conclusions of this paper could help in optimizing the combustion process in order to achieve high energy recovery from tomato residues. Obtained kinetic data would help in the design of combustion reactors.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper is part of a sustainable development approach, the aim being to develop a thermochemical energy recovery path while reducing the amount of tomato waste issued from agro-industrial units. The thermal process may contribute to an environmentally friendly management and help tomato processing industries creating new economic profitable circuits in an increasingly competitive context. The adopted approach was to follow the operating conditions needed for a complete thermal degradation through a thermal and kinetic analyses. The results of the tomato waste characterization confirmed their suitability to a thermochemical processing with high volatiles and fixed carbon and interesting high heating values comparable to sawdust biomass. We were able to isolate of the decomposition domains and extract kinetic parameters. Three kinetic models were applied; Flynn⁻Wall⁻Ozawa (FWO) simulated the best the combustion process. Calculated curves were validated by the first order (n = 1) model except for the slow heating rate of 5 °C/min which was fitted by the contracted cylinder model. The conclusions of this paper could help in optimizing the combustion process in order to achieve high energy recovery from tomato residues. Obtained kinetic data would help in the design of combustion reactors. |
Mortada, Boushra; Chaplais, Gerald; Nouali, Habiba; Marichal, Claire; Patarin, Joel Phase Transformations of Metal-Organic Frameworks MAF-6 and ZIF-71 during Intrusion-Extrusion Experiments (Article de journal) Journal of Physical Chemistry C, 123 (7), p. 4319–4328, 2019. @article{Mortada2019, title = {Phase Transformations of Metal-Organic Frameworks MAF-6 and ZIF-71 during Intrusion-Extrusion Experiments}, author = { Boushra Mortada and Gerald Chaplais and Habiba Nouali and Claire Marichal and Joel Patarin}, doi = {10.1021/acs.jpcc.8b12047}, year = {2019}, date = {2019-02-01}, journal = {Journal of Physical Chemistry C}, volume = {123}, number = {7}, pages = {4319--4328}, abstract = {In this work, the energetic behaviors of two zeolitic imidazolate framework (ZIF) materials, ZIF-71 and the highly porous MAF-6, of RHO topology are studied in high-pressure intrusion-extrusion experiments using LiCl 20 M aqueous solution and/or water as nonwetting liquids. During the intrusion-extrusion experiments, both MAF-6 and ZIF-71 structures undergo phase transformations under the combined effects of high pressure and the nonwetting liquid. For the "MAF-6 H2O" system, the volume variation step observed on the intrusion curve of the first intrusion-extrusion cycle partially corresponds to the intrusion of water molecules inside the MAF-6 pores associated with a partial and irreversible phase transformation of MAF-6 into a nonporous and unidentified phase X. When the pressure is released, that is, when the experiment is stopped at the end of the volume variation step and the system returns to atmospheric pressure, the intruded water molecules are expelled from the porosity of the remaining MAF-6 material, and the "MAF-6-H2O" system, therefore, displays a mixture of shock-absorber and bumper behaviors. In the case of both "MAF-6" and "ZIF-71-LiCl 20 M aqueous solution" systems, the volume variation step is shifted to a higher pressure range, indicating that the intrusion of the nonwetting liquid molecules occurs at a higher pressure because of the presence of electrolytes. For the "MAF-6 LiCl 20 M aqueous solution" system, a mixture of MAF-6 and phase X is obtained at the end of the volume variation step, which probably indicates energetic behavior similar to the one observed for the "MAF-6 H2O" system (i.e., a mixture of shock-absorber and bumper behaviors). In the case of the "ZIF-71-LiCl 20 M aqueous solution" system, the volume variation step observed on the intrusion curve of the first intrusion-extrusion cycle corresponds to a phase transformation. At the end of this step, the ZIF-71 structure is completely transformed into ZIF-72 (lcs). The "ZIF-71 LiCl 20 M aqueous solution" system, thus, displays bumper behavior, as the supplied mechanical energy is absorbed during the irreversible phase transformation phenomenon.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this work, the energetic behaviors of two zeolitic imidazolate framework (ZIF) materials, ZIF-71 and the highly porous MAF-6, of RHO topology are studied in high-pressure intrusion-extrusion experiments using LiCl 20 M aqueous solution and/or water as nonwetting liquids. During the intrusion-extrusion experiments, both MAF-6 and ZIF-71 structures undergo phase transformations under the combined effects of high pressure and the nonwetting liquid. For the "MAF-6 H2O" system, the volume variation step observed on the intrusion curve of the first intrusion-extrusion cycle partially corresponds to the intrusion of water molecules inside the MAF-6 pores associated with a partial and irreversible phase transformation of MAF-6 into a nonporous and unidentified phase X. When the pressure is released, that is, when the experiment is stopped at the end of the volume variation step and the system returns to atmospheric pressure, the intruded water molecules are expelled from the porosity of the remaining MAF-6 material, and the "MAF-6-H2O" system, therefore, displays a mixture of shock-absorber and bumper behaviors. In the case of both "MAF-6" and "ZIF-71-LiCl 20 M aqueous solution" systems, the volume variation step is shifted to a higher pressure range, indicating that the intrusion of the nonwetting liquid molecules occurs at a higher pressure because of the presence of electrolytes. For the "MAF-6 LiCl 20 M aqueous solution" system, a mixture of MAF-6 and phase X is obtained at the end of the volume variation step, which probably indicates energetic behavior similar to the one observed for the "MAF-6 H2O" system (i.e., a mixture of shock-absorber and bumper behaviors). In the case of the "ZIF-71-LiCl 20 M aqueous solution" system, the volume variation step observed on the intrusion curve of the first intrusion-extrusion cycle corresponds to a phase transformation. At the end of this step, the ZIF-71 structure is completely transformed into ZIF-72 (lcs). The "ZIF-71 LiCl 20 M aqueous solution" system, thus, displays bumper behavior, as the supplied mechanical energy is absorbed during the irreversible phase transformation phenomenon. |
Jeguirim, Mejdi; Limousy, Lionel Biomass Chars: Elaboration, Characterization and Applications II (Article de journal) Energies, 12 (3), p. 384, 2019. @article{Jeguirim2019, title = {Biomass Chars: Elaboration, Characterization and Applications II}, author = { Mejdi Jeguirim and Lionel Limousy}, doi = {10.3390/en12030384}, year = {2019}, date = {2019-02-01}, journal = {Energies}, volume = {12}, number = {3}, pages = {384}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Hanache, Layla El; Lebeau, Benedicte; Nouali, Habiba; Toufaily, Joumana; Hamieh, Tayssir; Daou, Jean T Performance of surfactant-modified *BEA-type zeolite nanosponges for the removal of nitrate in contaminated water: Effect of the external surface. (Article de journal) Journal of hazardous materials, 364 , p. 206–217, 2019. @article{ElHanache2019, title = {Performance of surfactant-modified *BEA-type zeolite nanosponges for the removal of nitrate in contaminated water: Effect of the external surface.}, author = { Layla El Hanache and Benedicte Lebeau and Habiba Nouali and Joumana Toufaily and Tayssir Hamieh and T. Jean Daou}, doi = {10.1016/j.jhazmat.2018.10.015}, year = {2019}, date = {2019-01-01}, journal = {Journal of hazardous materials}, volume = {364}, pages = {206--217}, abstract = {Hierarchical *BEA-type nanosponges zeolite with a high external surface area (116m2.g-1) and small crystal size, synthesized in the presence of a dual-porogenic organic compound, were modified with a cationic surfactant (HDTMA+Br-: hexadecyltrimethyl ammonium bromide) in order to create a new anion exchanger system: the surfactant-modified zeolite nanosponges (SMZNS). For comparison, two other surfactant-modified *BEA-type zeolite materials, SMZMC and SMZNC, were obtained by modifying the synthesized conventional micron-size microcrytals and nanocrystals *BEA-type zeolite with HDTMA+Br-, respectively. Textural and structural properties were determined for the three prepared materials using N2 adsorption/desorption analysis, XRD, SEM, and TEM. Nitrate adsorption isotherms were drawn in a large concentration range [0.8-24.2mmol.L-1] and fitted with Langmuir isotherm model. The maximum nitrate removal capacity (1338mmol.Kg-1/83mg.g-1) was obtained for SMZNS material. This value is the highest ever observed for nitrate removal using surfactant-modified zeolite. The nitrate removal kinetics were fitted with the pseudo second-order model for both materials SMZNS and SMZNC.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Hierarchical *BEA-type nanosponges zeolite with a high external surface area (116m2.g-1) and small crystal size, synthesized in the presence of a dual-porogenic organic compound, were modified with a cationic surfactant (HDTMA+Br-: hexadecyltrimethyl ammonium bromide) in order to create a new anion exchanger system: the surfactant-modified zeolite nanosponges (SMZNS). For comparison, two other surfactant-modified *BEA-type zeolite materials, SMZMC and SMZNC, were obtained by modifying the synthesized conventional micron-size microcrytals and nanocrystals *BEA-type zeolite with HDTMA+Br-, respectively. Textural and structural properties were determined for the three prepared materials using N2 adsorption/desorption analysis, XRD, SEM, and TEM. Nitrate adsorption isotherms were drawn in a large concentration range [0.8-24.2mmol.L-1] and fitted with Langmuir isotherm model. The maximum nitrate removal capacity (1338mmol.Kg-1/83mg.g-1) was obtained for SMZNS material. This value is the highest ever observed for nitrate removal using surfactant-modified zeolite. The nitrate removal kinetics were fitted with the pseudo second-order model for both materials SMZNS and SMZNC. |
Nita, Cristina; Fullenwarth, Julien; Monconduit, Laure; Meins, Jean-Marc Le; Fioux, Philippe; Parmentier, Julien; Ghimbeu, Camelia Matei Eco-friendly synthesis of SiO2 nanoparticles confined in hard carbon: A promising material with unexpected mechanism for Li-ion batteries (Article de journal) Carbon, 143 , p. 598–609, 2019. @article{Nita2019, title = {Eco-friendly synthesis of SiO2 nanoparticles confined in hard carbon: A promising material with unexpected mechanism for Li-ion batteries}, author = { Cristina Nita and Julien Fullenwarth and Laure Monconduit and Jean-Marc Le Meins and Philippe Fioux and Julien Parmentier and Camelia Matei Ghimbeu}, doi = {10.1016/j.carbon.2018.11.069}, year = {2019}, date = {2019-01-01}, journal = {Carbon}, volume = {143}, pages = {598--609}, abstract = {A fast, simple and environmentally friendly one-pot route to obtain carbon/SiO2 hybrid materials is reported in this work. This consists in simple mixture of carbon and silica precursors, followed by thermal annealing at different temperatures. An interpenetrating hybrid network composed of hard carbon and amorphous SiO2 nanoparticles (2-5 nm) homogeneously distributed was achieved. Increasing the annealing temperature from 600 degrees C up to 1200 degrees C, the material porosity and oxygen functional groups are gradually removed, while the amorphous nature of SiO2 is conserved. This allows to diminish the irreversible capacity during the first charge-discharge cycle and to increase the reversible capacity. An excellent cycling capability, with a reversible capacity up to 535 mA hg(-1) at C/5 constant current rate was obtained for C/SiO2 materials used as anodes for Li-ion batteries. An atypical increase of the capacity during the first 50 cycles followed by a stable plateau up to 250 cycles was observed and related to electrolyte wettability limitation through the materials, particularly for those annealed at high temperatures which are more hydrophobic, less porous and the SiO2 nanoparticles less accessible. The SiO2 lithiation mechanism was evaluated by XRD, TEM and XPS post-mortem analyses and revealed the formation of reversible lithium silicate phases. (C) 2018 Elsevier Ltd. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A fast, simple and environmentally friendly one-pot route to obtain carbon/SiO2 hybrid materials is reported in this work. This consists in simple mixture of carbon and silica precursors, followed by thermal annealing at different temperatures. An interpenetrating hybrid network composed of hard carbon and amorphous SiO2 nanoparticles (2-5 nm) homogeneously distributed was achieved. Increasing the annealing temperature from 600 degrees C up to 1200 degrees C, the material porosity and oxygen functional groups are gradually removed, while the amorphous nature of SiO2 is conserved. This allows to diminish the irreversible capacity during the first charge-discharge cycle and to increase the reversible capacity. An excellent cycling capability, with a reversible capacity up to 535 mA hg(-1) at C/5 constant current rate was obtained for C/SiO2 materials used as anodes for Li-ion batteries. An atypical increase of the capacity during the first 50 cycles followed by a stable plateau up to 250 cycles was observed and related to electrolyte wettability limitation through the materials, particularly for those annealed at high temperatures which are more hydrophobic, less porous and the SiO2 nanoparticles less accessible. The SiO2 lithiation mechanism was evaluated by XRD, TEM and XPS post-mortem analyses and revealed the formation of reversible lithium silicate phases. (C) 2018 Elsevier Ltd. All rights reserved. |
Abdelaziz, Malek Ben; Chouchene, Bilel; Balan, Lavinia; Gries, Thomas; Medjahdi, Ghouti; Ezzaouia, Hatem; Schneider, Raphael One pot synthesis of bismuth oxide/graphitic carbon nitride composites with high photocatalytic activity (Article de journal) Molecular Catalysis, 463 , p. 110–118, 2019. @article{BenAbdelaziz2019, title = {One pot synthesis of bismuth oxide/graphitic carbon nitride composites with high photocatalytic activity}, author = { Malek Ben Abdelaziz and Bilel Chouchene and Lavinia Balan and Thomas Gries and Ghouti Medjahdi and Hatem Ezzaouia and Raphael Schneider}, doi = {10.1016/j.mcat.2018.12.004}, year = {2019}, date = {2019-01-01}, journal = {Molecular Catalysis}, volume = {463}, pages = {110--118}, abstract = {A one pot synthesis of heterostructured bismuth oxide (Bi2O3)/graphitic carbon nitride (g-CN) photocatalysts was developed using Bi(NO3)(3) and melamine in 1 M HNO3 as precursors. SEM, TEM and XPS analyses demonstrate that Bi2O3 is closely associated to g-CN, producing contacted interfaces between the two materials. The loading in Bi2O3 was varied from 1.25 to 10 wt% and the highest photocatalytic activity was obtained for the composite containing 2.5% BBN. The Bi2O3 (2.5%)/g-CN material exhibits excellent photocatalytic activity under visible light irradiation for the degradation of RhB as well as a good stability and reusability. Reactive species trapping experiments demonstrated that superoxide O-2(center dot-) radicals and to a lesser extent holes play a key role in the decomposition of the dye. The high photocatalytic activity of the Bi2O3 (2.5%)/g-CN composite originates from the effective separation of photogenerated charge carriers, which was confirmed by photoluminescence and photocurrent measurements, and from its high specific surface area (26.1 m(2)/g). The convenient and low cost method developed for the preparation of g-CN-based photocatalysts is of high interest for the synthesis of new heterostructured materials for environmental remediation.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A one pot synthesis of heterostructured bismuth oxide (Bi2O3)/graphitic carbon nitride (g-CN) photocatalysts was developed using Bi(NO3)(3) and melamine in 1 M HNO3 as precursors. SEM, TEM and XPS analyses demonstrate that Bi2O3 is closely associated to g-CN, producing contacted interfaces between the two materials. The loading in Bi2O3 was varied from 1.25 to 10 wt% and the highest photocatalytic activity was obtained for the composite containing 2.5% BBN. The Bi2O3 (2.5%)/g-CN material exhibits excellent photocatalytic activity under visible light irradiation for the degradation of RhB as well as a good stability and reusability. Reactive species trapping experiments demonstrated that superoxide O-2(center dot-) radicals and to a lesser extent holes play a key role in the decomposition of the dye. The high photocatalytic activity of the Bi2O3 (2.5%)/g-CN composite originates from the effective separation of photogenerated charge carriers, which was confirmed by photoluminescence and photocurrent measurements, and from its high specific surface area (26.1 m(2)/g). The convenient and low cost method developed for the preparation of g-CN-based photocatalysts is of high interest for the synthesis of new heterostructured materials for environmental remediation. |
Bardon, Julien; Dieden, Reiner; Grysan, Patrick; Mertz, Gregory; Martin, Arnaud; Delmee, Maxime; Ruch, David Mechanical properties of thin plasma polymer coatings from hexanediol dimethacrylate and relations with their chemical properties (Article de journal) Surface & Coatings Technology, 358 , p. 320–330, 2019. @article{Bardon2019, title = {Mechanical properties of thin plasma polymer coatings from hexanediol dimethacrylate and relations with their chemical properties}, author = { Julien Bardon and Reiner Dieden and Patrick Grysan and Gregory Mertz and Arnaud Martin and Maxime Delmee and David Ruch}, doi = {10.1016/j.surfcoat.2018.10.064}, year = {2019}, date = {2019-01-01}, journal = {Surface & Coatings Technology}, volume = {358}, pages = {320--330}, abstract = {The deposition of thin coatings by plasma processes operated at atmospheric pressure is a versatile process for the deposition of functional coatings. However, there is a need to understand their mechanical properties as a function of plasma deposition process parameters since the durability of the coatings is strongly dependent on these properties. In this work, a new approach to obtaining plasma coatings with a controlled level of cross-linking was developed. The precursor molecule to plasma polymer coatings is hexanediol dimethacrylate (HdiMA), a di-functional methacrylate; the plasma deposition conditions were chosen to strongly decrease the precursor fragmentation, so that the plasma polymerization of this precursor leads to a cross-linked structure through the reaction of methacrylate bonds. Plasma coatings from HdiMA are deposited in different plasma conditions. The chemical structure of plasma polymers is investigated by means of infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The mechanical properties of the coatings are determined by nanoscratch and atomic force microscopy (AFM) force curves tests. Better mechanical properties are obtained for coatings deposited with a low concentration of aerosol in the plasma and a higher plasma power. This corresponds to coatings exhibiting the higher conversion rate.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The deposition of thin coatings by plasma processes operated at atmospheric pressure is a versatile process for the deposition of functional coatings. However, there is a need to understand their mechanical properties as a function of plasma deposition process parameters since the durability of the coatings is strongly dependent on these properties. In this work, a new approach to obtaining plasma coatings with a controlled level of cross-linking was developed. The precursor molecule to plasma polymer coatings is hexanediol dimethacrylate (HdiMA), a di-functional methacrylate; the plasma deposition conditions were chosen to strongly decrease the precursor fragmentation, so that the plasma polymerization of this precursor leads to a cross-linked structure through the reaction of methacrylate bonds. Plasma coatings from HdiMA are deposited in different plasma conditions. The chemical structure of plasma polymers is investigated by means of infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The mechanical properties of the coatings are determined by nanoscratch and atomic force microscopy (AFM) force curves tests. Better mechanical properties are obtained for coatings deposited with a low concentration of aerosol in the plasma and a higher plasma power. This corresponds to coatings exhibiting the higher conversion rate. |
Khiari, Besma; Wakkel, Manel; Abdelmoumen, Souhir; Jeguirim, Mejdi Dynamics and Kinetics of Cupric Ion Removal from Wastewaters by Tunisian Solid Crude Olive-Oil Waste. (Article de journal) Materials (Basel, Switzerland), 12 (3), 2019. @article{Khiari2019, title = {Dynamics and Kinetics of Cupric Ion Removal from Wastewaters by Tunisian Solid Crude Olive-Oil Waste.}, author = { Besma Khiari and Manel Wakkel and Souhir Abdelmoumen and Mejdi Jeguirim}, doi = {10.3390/ma12030365}, year = {2019}, date = {2019-01-01}, journal = {Materials (Basel, Switzerland)}, volume = {12}, number = {3}, abstract = {The present paper aims to develop a low cost, efficient, and environmentally-friendly process to purify (industrial) waters contaminated by copper by the use of oil mill wastes, through kinetic, thermodynamic, and equilibrium investigations. To do so, the raw adsorbent was characterized using different analytical techniques including X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Then, the interaction between copper and olive residues were examined during batch adsorption tests at various operating parameters, such as pH, initial concentration, contact time, and particle size. Kinetic data were best fitted with Broeurs-Sotolongo kinetic model. Additionally, it was found that film and intraparticle diffusion steps controlled simultaneously the mass transfer of copper onto olive mill solid waste. Among the eight tested models, Broeurs-Sotolongo isotherm suited the most the sorption, with regards to the function errors analysis. It was deduced that the adsorption of copper does not involve chemical bonds with high energy which allows easier regeneration steps and higher number of biosorbent regeneration cycles without any need for applying high temperature in the desorption reaction systems. The adsorption capacity (18.93 mg/g) calculated on the basis of this model was close to the experimental value (18.4 mg/g) but more interestingly it brought up that 50% of the generated amounts of olive wastes in Tunisia could eliminate 1.84 kTons of copper from industrial waters.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The present paper aims to develop a low cost, efficient, and environmentally-friendly process to purify (industrial) waters contaminated by copper by the use of oil mill wastes, through kinetic, thermodynamic, and equilibrium investigations. To do so, the raw adsorbent was characterized using different analytical techniques including X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Then, the interaction between copper and olive residues were examined during batch adsorption tests at various operating parameters, such as pH, initial concentration, contact time, and particle size. Kinetic data were best fitted with Broeurs-Sotolongo kinetic model. Additionally, it was found that film and intraparticle diffusion steps controlled simultaneously the mass transfer of copper onto olive mill solid waste. Among the eight tested models, Broeurs-Sotolongo isotherm suited the most the sorption, with regards to the function errors analysis. It was deduced that the adsorption of copper does not involve chemical bonds with high energy which allows easier regeneration steps and higher number of biosorbent regeneration cycles without any need for applying high temperature in the desorption reaction systems. The adsorption capacity (18.93 mg/g) calculated on the basis of this model was close to the experimental value (18.4 mg/g) but more interestingly it brought up that 50% of the generated amounts of olive wastes in Tunisia could eliminate 1.84 kTons of copper from industrial waters. |
Boukhchina, Sahar; Akrout, Hanene; Berling, Dominique; Bousselmi, Latifa Highly efficient modified lead oxide electrode using a spin coating/electrodeposition mode on titanium for electrochemical treatment of pharmaceutical pollutant. (Article de journal) Chemosphere, 221 , p. 356–365, 2019. @article{Boukhchina2019, title = {Highly efficient modified lead oxide electrode using a spin coating/electrodeposition mode on titanium for electrochemical treatment of pharmaceutical pollutant.}, author = { Sahar Boukhchina and Hanene Akrout and Dominique Berling and Latifa Bousselmi}, doi = {10.1016/j.chemosphere.2019.01.057}, year = {2019}, date = {2019-01-01}, journal = {Chemosphere}, volume = {221}, pages = {356--365}, abstract = {In this study, Ti/TiO2/PbO2 anodes consisting of a PbO2 coating growth on the TiO2 interlayer deposited on titanium substrates were prepared combining different deposition technics: electrochemical method using anodization (Anod), electrodeposition (EL), and sol gel spin coating (SG). Different kinds of anodes have been tested for the removal of ampicillin, a pharmaceutical pollutant, from water. The structure and the surface morphology of the prepared multiple coatings were characterized by scanning electron microscopy and Energy-Dispersive X-ray spectroscopy respectively. Electrochemical impedance spectroscopy was also investigated in order to study the electrocatalytic activity of the anodes. The performance of the electrodes was evaluated through high performance liquid chromatography and chemical oxygen demand (COD) measurements. It was noticed that ampicillin could be mineralized by anodic oxidation process using Ti/TiO2/PbO2 anodes. The best results were obtained for Ti/TiO2SG/PbO2EL as anode with a 64% of COD removal after 300 min of treatment and a fast decrease in the amount of ampicillin was reached after almost one hour. Experimental results demonstrate that Ti/TiO2SG/PbO2EL anode presents the best ability for the degradation of ampicillin through anodic oxidation compared to the Ti/TiO2SG/PbO2SG and Ti/TiO2Anod/PbO2EL electrodes.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this study, Ti/TiO2/PbO2 anodes consisting of a PbO2 coating growth on the TiO2 interlayer deposited on titanium substrates were prepared combining different deposition technics: electrochemical method using anodization (Anod), electrodeposition (EL), and sol gel spin coating (SG). Different kinds of anodes have been tested for the removal of ampicillin, a pharmaceutical pollutant, from water. The structure and the surface morphology of the prepared multiple coatings were characterized by scanning electron microscopy and Energy-Dispersive X-ray spectroscopy respectively. Electrochemical impedance spectroscopy was also investigated in order to study the electrocatalytic activity of the anodes. The performance of the electrodes was evaluated through high performance liquid chromatography and chemical oxygen demand (COD) measurements. It was noticed that ampicillin could be mineralized by anodic oxidation process using Ti/TiO2/PbO2 anodes. The best results were obtained for Ti/TiO2SG/PbO2EL as anode with a 64% of COD removal after 300 min of treatment and a fast decrease in the amount of ampicillin was reached after almost one hour. Experimental results demonstrate that Ti/TiO2SG/PbO2EL anode presents the best ability for the degradation of ampicillin through anodic oxidation compared to the Ti/TiO2SG/PbO2SG and Ti/TiO2Anod/PbO2EL electrodes. |
Quint, Valentin; Chouchene, Nourhene; Askri, Moheddine; Lalevee, Jacques; Gaumont, Annie-Claude; Lakhdar, Sami Visible-light-mediated -phosphorylation of N-aryl tertiary amines through the formation of electron-donor-acceptor complexes: synthetic and mechanistic studies (Article de journal) Organic Chemistry Frontiers, 6 (1), p. 41–44, 2019. @article{Quint2019, title = {Visible-light-mediated -phosphorylation of N-aryl tertiary amines through the formation of electron-donor-acceptor complexes: synthetic and mechanistic studies}, author = { Valentin Quint and Nourhene Chouchene and Moheddine Askri and Jacques Lalevee and Annie-Claude Gaumont and Sami Lakhdar}, doi = {10.1039/c8qo00985f}, year = {2019}, date = {2019-01-01}, journal = {Organic Chemistry Frontiers}, volume = {6}, number = {1}, pages = {41--44}, abstract = {This work describes an efficient -phosphorylation of a wide variety of N-aryl tertiary amines under mild conditions. It consists of a simple combination of amines (electron donors) with N-ethoxy-2-methylpyridinium tetrafluoroborate (electron acceptor) in the presence of P(v)-H compounds under visible light irradiation. Physical organic investigations support the formation of an electron-donor-acceptor complex (amine/pyridinium ion) as a key intermediate.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This work describes an efficient -phosphorylation of a wide variety of N-aryl tertiary amines under mild conditions. It consists of a simple combination of amines (electron donors) with N-ethoxy-2-methylpyridinium tetrafluoroborate (electron acceptor) in the presence of P(v)-H compounds under visible light irradiation. Physical organic investigations support the formation of an electron-donor-acceptor complex (amine/pyridinium ion) as a key intermediate. |
Ghrear, Tamara Mahmoud Ali; Rigolet, Severinne; Daou, Jean T; Mintova, Svetlana; Ling, Tau Chuan; Tan, Soon Huat; Ng, Eng-Poh Synthesis of Cs-ABW nanozeolite in organotemplate-free system (Article de journal) Microporous and Mesoporous Materials, 277 , p. 78–83, 2019. @article{Ghrear2019, title = {Synthesis of Cs-ABW nanozeolite in organotemplate-free system}, author = { Tamara Mahmoud Ali Ghrear and Severinne Rigolet and T. Jean Daou and Svetlana Mintova and Tau Chuan Ling and Soon Huat Tan and Eng-Poh Ng}, doi = {10.1016/j.micromeso.2018.10.014}, year = {2019}, date = {2019-01-01}, journal = {Microporous and Mesoporous Materials}, volume = {277}, pages = {78--83}, abstract = {Cesium-aluminosilicate zeolite nanocrystals with ABW framework structure are synthesized free of organic template using hydrothermal approach. The crystallization process of Cs-ABW zeolite nanocrystals by varying the initial gel molar composition, heating temperature and crystallization time was studied. More detailed investigations of the formation of Cs-ABW nanozeolite using a reactive clear precursor hydrogel (4SiO(2):1Al(2)O(3):16Cs(2)O:160H(2)O) were then carried out. Fully crystalline Cs-ABW nanozeolites were obtained within 120 min at 180 degrees C and 22 bar, which is considerably faster and safer in comparison to the currently available method involving treatment at 695 degrees C, 1000 bar and 46 h. The Cs-ABW nanocrystals have grain shape morphology with a mean size of 32 nm and they do not agglomerate for long durations. The nanosized Cs-ABW zeolite has high alumina content (Si/Al ratio = 1.04). These nanocrystals can be prepared in high solid yield (ca. 82%) thus offering a promising route for large-scale production of highly basic zeolite nanoparticles.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Cesium-aluminosilicate zeolite nanocrystals with ABW framework structure are synthesized free of organic template using hydrothermal approach. The crystallization process of Cs-ABW zeolite nanocrystals by varying the initial gel molar composition, heating temperature and crystallization time was studied. More detailed investigations of the formation of Cs-ABW nanozeolite using a reactive clear precursor hydrogel (4SiO(2):1Al(2)O(3):16Cs(2)O:160H(2)O) were then carried out. Fully crystalline Cs-ABW nanozeolites were obtained within 120 min at 180 degrees C and 22 bar, which is considerably faster and safer in comparison to the currently available method involving treatment at 695 degrees C, 1000 bar and 46 h. The Cs-ABW nanocrystals have grain shape morphology with a mean size of 32 nm and they do not agglomerate for long durations. The nanosized Cs-ABW zeolite has high alumina content (Si/Al ratio = 1.04). These nanocrystals can be prepared in high solid yield (ca. 82%) thus offering a promising route for large-scale production of highly basic zeolite nanoparticles. |
Girard, Clement; Gupta, Manisha; Lallam, Abdelaziz; Anokhin, Denis V; Bovsunovskaya, Polina V; Akhyamova, Azaliya F; Melnikov, Alexey P; Piryazev, Alexey A; Rodygin, Alexander I; Rychkov, Andrey A; Grafskaya, Kseniia N; Shabratova, Ekaterina D; Zhu, Xiaomin; Moeller, Martin; Ivanov, Dimitri A Synthesis and characterization of poly(ester amide amide)s of different alkylene chain lengths (Article de journal) Polymer Bulletin, 76 (1), p. 495–509, 2019. @article{Girard2019, title = {Synthesis and characterization of poly(ester amide amide)s of different alkylene chain lengths}, author = { Clement Girard and Manisha Gupta and Abdelaziz Lallam and Denis V. Anokhin and Polina V. Bovsunovskaya and Azaliya F. Akhyamova and Alexey P. Melnikov and Alexey A. Piryazev and Alexander I. Rodygin and Andrey A. Rychkov and Kseniia N. Grafskaya and Ekaterina D. Shabratova and Xiaomin Zhu and Martin Moeller and Dimitri A. Ivanov}, doi = {10.1007/s00289-018-2361-7}, year = {2019}, date = {2019-01-01}, journal = {Polymer Bulletin}, volume = {76}, number = {1}, pages = {495--509}, abstract = {In this work, a series of aliphatic biodegradable poly(ester amide amide) polymers was synthesized by melt polycondensation of a tailor-made amide-containing monomer based on 1,4-diaminobutane and epsilon-caprolactone and different dicarboxylic acid methyl esters with even number of methylene groups. The synthesized polymers were characterized by H-1 NMR, FT-IR spectroscopy, GPC, SAXS and WAXS. DSC results show that the melting point is located at about 150 degrees C for all polymers. X-ray scattering experiments in small and wide angles reveal formation of crystals with extended-chain conformation resulting in strict periodicity of electron density along the main chain. TGA data indicate the high thermal stability of polymers to temperatures above 350 degrees C, which are much above the melting point. The obtained characteristics of the newly synthesized PEAAs can open new perspectives for melt processing to fabricate films, highly oriented fibers and injection-molded parts with good thermal stability and mechanical performance.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this work, a series of aliphatic biodegradable poly(ester amide amide) polymers was synthesized by melt polycondensation of a tailor-made amide-containing monomer based on 1,4-diaminobutane and epsilon-caprolactone and different dicarboxylic acid methyl esters with even number of methylene groups. The synthesized polymers were characterized by H-1 NMR, FT-IR spectroscopy, GPC, SAXS and WAXS. DSC results show that the melting point is located at about 150 degrees C for all polymers. X-ray scattering experiments in small and wide angles reveal formation of crystals with extended-chain conformation resulting in strict periodicity of electron density along the main chain. TGA data indicate the high thermal stability of polymers to temperatures above 350 degrees C, which are much above the melting point. The obtained characteristics of the newly synthesized PEAAs can open new perspectives for melt processing to fabricate films, highly oriented fibers and injection-molded parts with good thermal stability and mechanical performance. |
Guizani, Chamseddine; Jeguirim, Mejdi; Valin, Sylvie; Peyrot, Marine; Salvador, Sylvain The Heat Treatment Severity Index: A new metric correlated to the properties of biochars obtained from entrained flow pyrolysis of biomass (Article de journal) Fuel, 244 , p. 61–68, 2019. @article{Guizani2019, title = {The Heat Treatment Severity Index: A new metric correlated to the properties of biochars obtained from entrained flow pyrolysis of biomass}, author = { Chamseddine Guizani and Mejdi Jeguirim and Sylvie Valin and Marine Peyrot and Sylvain Salvador}, doi = {10.1016/j.fuel.2019.01.170}, year = {2019}, date = {2019-01-01}, journal = {Fuel}, volume = {244}, pages = {61--68}, abstract = {The properties of biochars produced in biomass pyrolysis processes highly depend on the pyrolysis conditions, specifically the pyrolysis temperature and thermal treatment duration. The higher the temperature and the duration, the more severe is the heat treatment. The present work proposes a new Heat Treatment Severity Index (HTSI) for the quantification of the heat treatment severity during the pyrolysis reaction. This metric takes into account both effects of reactor temperature and heat treatment time inside the reactor. The relevance of this HTSI is assessed through analyzing the evolution of some properties of biochars obtained after pyrolysis of 370 mu m beech wood particles in an entrained flow reactor. These biochars were characterized for their chemical composition (elemental analysis), structure (Raman spectroscopy) and reactivity towards oxygen (thermogravimetric analysis). These properties were well correlated with the HTSI following remarkable mathematical relationships. This finding demonstrates the possibility to engineer biochars with controlled properties by a careful mastering of the experimental conditions of the pyrolysis process in terms of temperature and heat treatment time.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The properties of biochars produced in biomass pyrolysis processes highly depend on the pyrolysis conditions, specifically the pyrolysis temperature and thermal treatment duration. The higher the temperature and the duration, the more severe is the heat treatment. The present work proposes a new Heat Treatment Severity Index (HTSI) for the quantification of the heat treatment severity during the pyrolysis reaction. This metric takes into account both effects of reactor temperature and heat treatment time inside the reactor. The relevance of this HTSI is assessed through analyzing the evolution of some properties of biochars obtained after pyrolysis of 370 mu m beech wood particles in an entrained flow reactor. These biochars were characterized for their chemical composition (elemental analysis), structure (Raman spectroscopy) and reactivity towards oxygen (thermogravimetric analysis). These properties were well correlated with the HTSI following remarkable mathematical relationships. This finding demonstrates the possibility to engineer biochars with controlled properties by a careful mastering of the experimental conditions of the pyrolysis process in terms of temperature and heat treatment time. |
Lin, Yu-Ting; Yu, Shang-Yu; Zan, Hsiao-Wen; Yeh, Ping-Hung; Lu, Chia-Jung; Meng, Hsin-Fei; Luo, Chih-Wei; Soppera, Olivier Photo-assisted recovery in ammonia sensor based on organic vertical diode (Article de journal) Organic Electronics, 67 , p. 272–278, 2019. @article{Lin2019, title = {Photo-assisted recovery in ammonia sensor based on organic vertical diode}, author = { Yu-Ting Lin and Shang-Yu Yu and Hsiao-Wen Zan and Ping-Hung Yeh and Chia-Jung Lu and Hsin-Fei Meng and Chih-Wei Luo and Olivier Soppera}, doi = {10.1016/j.orgel.2019.01.036}, year = {2019}, date = {2019-01-01}, journal = {Organic Electronics}, volume = {67}, pages = {272--278}, abstract = {In this article, a photo-assisted gas sensor was provided to solve the slow recovering issue of the organic gas sensor. The proposed organic gas sensor can detect ammonia in parts-per-billion regime in 30 s and can be multiple uses, but the long recovery time about 5 min places difficulty to realize rapidly multiple-time sensing. Therefore, we used the photo-absorption ability in the organic semiconductor layer to generate the photocurrent and hence to compensate the current drop due to the ammonia absorption. The recovery time was significantly reduced to be only 1 min. The specific wavelength was also found to match the absorption spectrum in different organic sensing materials. As a comparison, the quartz crystal microbalance (QCM) was used to clarify the gas absorption and desorption mechanism. It is believed that this photo-assisted gas detection could be a general method to solve the slow recovery in organic-based gas sensors.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this article, a photo-assisted gas sensor was provided to solve the slow recovering issue of the organic gas sensor. The proposed organic gas sensor can detect ammonia in parts-per-billion regime in 30 s and can be multiple uses, but the long recovery time about 5 min places difficulty to realize rapidly multiple-time sensing. Therefore, we used the photo-absorption ability in the organic semiconductor layer to generate the photocurrent and hence to compensate the current drop due to the ammonia absorption. The recovery time was significantly reduced to be only 1 min. The specific wavelength was also found to match the absorption spectrum in different organic sensing materials. As a comparison, the quartz crystal microbalance (QCM) was used to clarify the gas absorption and desorption mechanism. It is believed that this photo-assisted gas detection could be a general method to solve the slow recovery in organic-based gas sensors. |
Gall, Florence Bally-Le; Mokhter, Akmali; Lakard, Sophie; Wolak, Severine; Kunemann, Philippe; Fioux, Philippe; Airoudj, Aissam; Yakhlifi, Salima El; Magnenet, Claire; Lakard, Boris; Roucoules, Vincent Poly(allylamine) plasma polymer coatings for an efficient retention of Ni(II) ions by ultrafiltration membranes (Article de journal) Plasma Processes and Polymers, 16 (3), p. e1800134, 2019. @article{Bally-LeGall2019, title = {Poly(allylamine) plasma polymer coatings for an efficient retention of Ni(II) ions by ultrafiltration membranes}, author = { Florence Bally-Le Gall and Akmali Mokhter and Sophie Lakard and Severine Wolak and Philippe Kunemann and Philippe Fioux and Aissam Airoudj and Salima El Yakhlifi and Claire Magnenet and Boris Lakard and Vincent Roucoules}, doi = {10.1002/ppap.201800134}, year = {2019}, date = {2019-01-01}, journal = {Plasma Processes and Polymers}, volume = {16}, number = {3}, pages = {e1800134}, abstract = {Functional ultrafiltration membranes can be used for water decontamination. Here, we investigate the use of plasma polymerization to modify polymeric membranes with poly(allylamine) in order to filtrate aqueous solutions contaminated with Ni(II) ions. A preliminary study is performed to control growth kinetics of polymer thin films with respect to the energy provided to the precursor during deposition. Filtration experiments then enable to quantify the efficiency of the different functional coatings as for their retention of Ni(II) ions and to identify the optimal characteristics of the polymer thin films. Retention rate as high as 96% can be achieved by this single-step functionalization process, which is very competitive compared to conventional multi-step wet chemical functionalization techniques.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Functional ultrafiltration membranes can be used for water decontamination. Here, we investigate the use of plasma polymerization to modify polymeric membranes with poly(allylamine) in order to filtrate aqueous solutions contaminated with Ni(II) ions. A preliminary study is performed to control growth kinetics of polymer thin films with respect to the energy provided to the precursor during deposition. Filtration experiments then enable to quantify the efficiency of the different functional coatings as for their retention of Ni(II) ions and to identify the optimal characteristics of the polymer thin films. Retention rate as high as 96% can be achieved by this single-step functionalization process, which is very competitive compared to conventional multi-step wet chemical functionalization techniques. |
Abdallah, Mira; Hijazi, Akram; Graff, Bernadette; Fouassier, Jean-Pierre; Rodeghiero, Giacomo; Gualandi, Andrea; Dumur, Frederic; Cozzi, Pier Giorgio; Lalevee, Jacques Coumarin derivatives as versatile photoinitiators for 3D printing, polymerization in water and photocomposite synthesis (Article de journal) Polymer Chemistry, 10 (7), p. 872–884, 2019. @article{Abdallah2019, title = {Coumarin derivatives as versatile photoinitiators for 3D printing, polymerization in water and photocomposite synthesis}, author = { Mira Abdallah and Akram Hijazi and Bernadette Graff and Jean-Pierre Fouassier and Giacomo Rodeghiero and Andrea Gualandi and Frederic Dumur and Pier Giorgio Cozzi and Jacques Lalevee}, doi = {10.1039/c8py01708e}, year = {2019}, date = {2019-01-01}, journal = {Polymer Chemistry}, volume = {10}, number = {7}, pages = {872--884}, abstract = {The goal of this paper concerns the first evaluation of two recently reported coumarins to initiate photopolymerization reactions. These two compounds (CoumA and CoumB) are proposed as high performance visible light photoinitiators and evaluated as photoredox catalysts (PCs), in the presence of an iodonium salt or with an amine, for both the free radical polymerization (FRP) of (meth) acrylates and the cationic polymerization (CP) of epoxides upon visible light exposure using an LED at 405 nm. These coumarin derivatives showed a high photoinitiation ability i. e. excellent polymerization rates and high final monomer conversions were obtained. The photophysical and photochemical properties of the coumarin derivatives were studied in terms of absorption, steady state photolysis and fluorescence spectroscopy. The photoinitiation mechanisms of the coumarin derivatives were discussed from fluorescence quenching, redox behavior and cyclic voltammetry experiments. A full picture of the involved photochemical mechanisms is provided. Coumarin-based systems are high performance photoinitiators, and their use in new photosensitive 3D printing resins will also be presented. Remarkably, CoumB is also found to be very efficient for the preparation of hydrogels under mild conditions due to its high solubility in water i. e. CoumB corresponds to a high-performance water soluble photoinitiator. Finally, the usage of the new coumarin derivatives for photocomposite synthesis with glass fibers (thick samples with a good depth of cure) using a near-UV conveyor (LED @ 395 nm) is particularly outlined.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The goal of this paper concerns the first evaluation of two recently reported coumarins to initiate photopolymerization reactions. These two compounds (CoumA and CoumB) are proposed as high performance visible light photoinitiators and evaluated as photoredox catalysts (PCs), in the presence of an iodonium salt or with an amine, for both the free radical polymerization (FRP) of (meth) acrylates and the cationic polymerization (CP) of epoxides upon visible light exposure using an LED at 405 nm. These coumarin derivatives showed a high photoinitiation ability i. e. excellent polymerization rates and high final monomer conversions were obtained. The photophysical and photochemical properties of the coumarin derivatives were studied in terms of absorption, steady state photolysis and fluorescence spectroscopy. The photoinitiation mechanisms of the coumarin derivatives were discussed from fluorescence quenching, redox behavior and cyclic voltammetry experiments. A full picture of the involved photochemical mechanisms is provided. Coumarin-based systems are high performance photoinitiators, and their use in new photosensitive 3D printing resins will also be presented. Remarkably, CoumB is also found to be very efficient for the preparation of hydrogels under mild conditions due to its high solubility in water i. e. CoumB corresponds to a high-performance water soluble photoinitiator. Finally, the usage of the new coumarin derivatives for photocomposite synthesis with glass fibers (thick samples with a good depth of cure) using a near-UV conveyor (LED @ 395 nm) is particularly outlined. |
Wu, Lei; Chaplais, Gerald; Xue, Ming; Qiu, Shilun; Patarin, Joel; Simon-Masseron, Angelique; Chen, Huaxin New functionalized MIL-53(In) solids: syntheses, characterization, sorption, and structural flexibility (Article de journal) Rsc Advances, 9 (4), p. 1918–1928, 2019. @article{Wu2019, title = {New functionalized MIL-53(In) solids: syntheses, characterization, sorption, and structural flexibility}, author = { Lei Wu and Gerald Chaplais and Ming Xue and Shilun Qiu and Joel Patarin and Angelique Simon-Masseron and Huaxin Chen}, doi = {10.1039/c8ra08522f}, year = {2019}, date = {2019-01-01}, journal = {Rsc Advances}, volume = {9}, number = {4}, pages = {1918--1928}, abstract = {The syntheses and characterization of a series of functionalized MIL-53(In) solids have been reported. Chemical groups with variations in steric hindrance and chemical nature (-(OH)(2), -Br or -NO2 groups) were introduced through the terephthalate linker to modify the pore surface. Single crystal X-ray diffraction data, N-2 adsorption-desorption isotherms, and infrared spectra were systematically investigated to explore the impact of the functional groups grafted onto the organic linker on the dynamic behaviour of these highly flexible hybrid porous frameworks. Owing to the distinctive steric hindrance and chemical nature, the different substituents can influence the interactions between the framework and the trapped molecules, further influencing the flexibility of the materials. Dihydroxyl modified MIL-53(In) exhibits no nitrogen accessible porosity. Notably, functionalization by -Br and -NO2 groups leads to the different capabilities of the corresponding solids to accommodate N-2 molecules.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The syntheses and characterization of a series of functionalized MIL-53(In) solids have been reported. Chemical groups with variations in steric hindrance and chemical nature (-(OH)(2), -Br or -NO2 groups) were introduced through the terephthalate linker to modify the pore surface. Single crystal X-ray diffraction data, N-2 adsorption-desorption isotherms, and infrared spectra were systematically investigated to explore the impact of the functional groups grafted onto the organic linker on the dynamic behaviour of these highly flexible hybrid porous frameworks. Owing to the distinctive steric hindrance and chemical nature, the different substituents can influence the interactions between the framework and the trapped molecules, further influencing the flexibility of the materials. Dihydroxyl modified MIL-53(In) exhibits no nitrogen accessible porosity. Notably, functionalization by -Br and -NO2 groups leads to the different capabilities of the corresponding solids to accommodate N-2 molecules. |
Vauthier, Madeline; Jierry, Loic; Mendez, Miguel Martinez L; Durst, Yann-Matthieu; Kelber, Julien; Roucoules, Vincent; Gall, Florence Bally-Le Interfacial Diels-Alder Reaction between Furan-Functionalized Polymer Coatings and Maleimide-Terminated Poly(ethylene glycol) (Article de journal) Journal of Physical Chemistry C, 123 (7), p. 4125–4132, 2019. @article{Vauthier2019, title = {Interfacial Diels-Alder Reaction between Furan-Functionalized Polymer Coatings and Maleimide-Terminated Poly(ethylene glycol)}, author = { Madeline Vauthier and Loic Jierry and Miguel L. Martinez Mendez and Yann-Matthieu Durst and Julien Kelber and Vincent Roucoules and Florence Bally-Le Gall}, doi = {10.1021/acs.jpcc.8b10533}, year = {2019}, date = {2019-01-01}, journal = {Journal of Physical Chemistry C}, volume = {123}, number = {7}, pages = {4125--4132}, abstract = {Surface functionalization is an interesting way to elaborate new smart materials. In this work, a two-step surface modification, based on pulsed plasma polymerization, was used to design functional surfaces able to react by Diels-Alder reaction (a diene dienophile cycloaddition). The reactivity of furan-functionalized (diene) surfaces with a maleimide-derivative (dienophile) was studied. The determination of the rate constants led to the determination of the activation energy, the enthalpy of activation, and the entropy of activation. These results were then compared to those obtained in solution. For the first time, it was possible to understand the role played by molecule confinement (close to the surface) on the Diels Alder reactivity.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Surface functionalization is an interesting way to elaborate new smart materials. In this work, a two-step surface modification, based on pulsed plasma polymerization, was used to design functional surfaces able to react by Diels-Alder reaction (a diene dienophile cycloaddition). The reactivity of furan-functionalized (diene) surfaces with a maleimide-derivative (dienophile) was studied. The determination of the rate constants led to the determination of the activation energy, the enthalpy of activation, and the entropy of activation. These results were then compared to those obtained in solution. For the first time, it was possible to understand the role played by molecule confinement (close to the surface) on the Diels Alder reactivity. |
Gigmes, D; Dumru, F; Zivci, N; Vilotte, S; Morris, J; Lalevee, J; Bonardi, AH Photoorganocatalysis in Organic Synthesis () 2019. (BibTeX) @bookinbook{Gigmes2019, title = {Photoorganocatalysis in Organic Synthesis}, author = { D. Gigmes and F. Dumru and N. Zivci and S. Vilotte and J. Morris and J. Lalevee and AH Bonardi}, isbn = {978-1-78634-604-9}, year = {2019}, date = {2019-01-01}, booktitle = {Photoorganocatalysts for Polymerization}, publisher = {World Scientific Publishing Co}, edition = {M. Fagnoni, S. Protti, D. Ravelli}, keywords = {}, pubstate = {published}, tppubtype = {bookinbook} } |
Sebileau, Jean-Charles; Lemonnier, Sebastien; Barraud, Elodie; Vallat, Marie-France; Carrado, Adele; Nardin, Michel Effects of pressure on poly(ether-ether-ketone) (PEEK) sintering mechanisms (Article de journal) Journal of Applied Polymer Science, 136 (24), p. 47645, 2019. @article{Sebileau2019, title = {Effects of pressure on poly(ether-ether-ketone) (PEEK) sintering mechanisms}, author = { Jean-Charles Sebileau and Sebastien Lemonnier and Elodie Barraud and Marie-France Vallat and Adele Carrado and Michel Nardin}, doi = {10.1002/app.47645}, year = {2019}, date = {2019-01-01}, journal = {Journal of Applied Polymer Science}, volume = {136}, number = {24}, pages = {47645}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yu, Shang-Yu; Tung, Tin-Wei; Yang, Hong-Yu; Chen, Guan-Yu; Shih, Che-Chi; Lee, Yu-Chih; Chen, Chang-Chiang; Zan, Hsiao-Wen; Meng, Hsin-Fei; Lu, Chia-Jung; Wang, Chien-Lung; Jian, Wen-Bin; Soppera, Olivier A Versatile Method to Enhance the Operational Current of Air-Stable Organic Gas Sensor for Monitoring of Breath Ammonia in Hemodialysis Patients. (Article de journal) ACS sensors, 2019. @article{Yu2019, title = {A Versatile Method to Enhance the Operational Current of Air-Stable Organic Gas Sensor for Monitoring of Breath Ammonia in Hemodialysis Patients.}, author = { Shang-Yu Yu and Tin-Wei Tung and Hong-Yu Yang and Guan-Yu Chen and Che-Chi Shih and Yu-Chih Lee and Chang-Chiang Chen and Hsiao-Wen Zan and Hsin-Fei Meng and Chia-Jung Lu and Chien-Lung Wang and Wen-Bin Jian and Olivier Soppera}, doi = {10.1021/acssensors.9b00223}, year = {2019}, date = {2019-01-01}, journal = {ACS sensors}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Frikha, Kawthar; Limousy, Lionel; Bouaziz, Jamel; Chaari, Kamel; Josien, Ludovic; Nouali, Habiba; Michelin, Laure; Vidal, Loic; Hajjar-Garreau, Samar; Bennici, Simona Binary Oxides Prepared by Microwave-Assisted Solution Combustion: Synthesis, Characterization and Catalytic Activity. (Article de journal) Materials (Basel, Switzerland), 12 (6), 2019. @article{Frikha2019, title = {Binary Oxides Prepared by Microwave-Assisted Solution Combustion: Synthesis, Characterization and Catalytic Activity.}, author = { Kawthar Frikha and Lionel Limousy and Jamel Bouaziz and Kamel Chaari and Ludovic Josien and Habiba Nouali and Laure Michelin and Loic Vidal and Samar Hajjar-Garreau and Simona Bennici}, doi = {10.3390/ma12060910}, year = {2019}, date = {2019-01-01}, journal = {Materials (Basel, Switzerland)}, volume = {12}, number = {6}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Dahou, Tilia; Dutournie, Patrick; Limousy, Lionel; Bennici, Simona; Perea, Nicolas Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses (Article de journal) Energies, 12 (3), p. 501, 2019. @article{Dahou2019, title = {Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses}, author = { Tilia Dahou and Patrick Dutournie and Lionel Limousy and Simona Bennici and Nicolas Perea}, doi = {10.3390/en12030501}, year = {2019}, date = {2019-01-01}, journal = {Energies}, volume = {12}, number = {3}, pages = {501}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Jeguirim.M, ; Limousy.L, Char and Carbon Materials derived from biomass: production, characterization and applications (Livre) Elsevier, 2019, ISBN: 978-0-12-814893-8. @book{Jeguirim.M2019, title = {Char and Carbon Materials derived from biomass: production, characterization and applications}, author = { Jeguirim.M and Limousy.L}, isbn = {978-0-12-814893-8}, year = {2019}, date = {2019-01-01}, edition = {Elsevier}, abstract = {Char and Carbon Materials Derived from Biomass: Production, Characterization and Applications provides an overview of biomass char production methods (pyrolysis, hydrothermal carbonization, etc.), along with the characterization techniques typically used (Scanning Electronic Microscopy, X-Ray Fluorescence, Nitrogen adsorption, etc.) In addition, the book includes a discussion of the various properties of biomass chars and their suitable recovery processes, concluding with a demonstration of applications. As biomass can be converted to energy, biofuels and bioproducts via thermochemical conversion processes, such as combustion, pyrolysis and gasification, this book is ideal for professionals in energy production and storage fields, as well as professionals in waste treatment, gas treatment, and more. Provides a discussion of sources of biomass feedstocks, such as agricultural, woody plants and food processing residue Discusses the various production processes of biomass chars, including pyrolysis and hydrothermal carbonization Explores various applications of biomass chars within different industries, including energy and agronomy}, keywords = {}, pubstate = {published}, tppubtype = {book} } Char and Carbon Materials Derived from Biomass: Production, Characterization and Applications provides an overview of biomass char production methods (pyrolysis, hydrothermal carbonization, etc.), along with the characterization techniques typically used (Scanning Electronic Microscopy, X-Ray Fluorescence, Nitrogen adsorption, etc.) In addition, the book includes a discussion of the various properties of biomass chars and their suitable recovery processes, concluding with a demonstration of applications. As biomass can be converted to energy, biofuels and bioproducts via thermochemical conversion processes, such as combustion, pyrolysis and gasification, this book is ideal for professionals in energy production and storage fields, as well as professionals in waste treatment, gas treatment, and more. Provides a discussion of sources of biomass feedstocks, such as agricultural, woody plants and food processing residue Discusses the various production processes of biomass chars, including pyrolysis and hydrothermal carbonization Explores various applications of biomass chars within different industries, including energy and agronomy |
2018 |
Dzene, Liva; Brendle, Jocelyne; Limousy, Lionel; Dutournie, Patrick; Martin, Christelle; Michau, Nicolas Synthesis of iron-rich tri-octahedral clay minerals: A review (Article de journal) Applied Clay Science, 166 , p. 276–287, 2018. @article{Dzene2018, title = {Synthesis of iron-rich tri-octahedral clay minerals: A review}, author = { Liva Dzene and Jocelyne Brendle and Lionel Limousy and Patrick Dutournie and Christelle Martin and Nicolas Michau}, doi = {10.1016/j.clay.2018.09.030}, year = {2018}, date = {2018-12-01}, journal = {Applied Clay Science}, volume = {166}, pages = {276--287}, abstract = {Examples in materials science and in geology show an interest for iron-rich tri-octahedral clay mineral synthesis in large amounts and with well-defined characteristics. This review summarizes previously reported methods and conditions for iron-rich tri-octahedral clay mineral synthesis. Two approaches of hydrothermal synthesis have been applied: using gel or solid precursors. The most common synthesis approach is the hydrothermal synthesis using gel precursor. The synthesis of 1:1 type clay minerals were performed in reducing conditions in neutral or alkaline pH at various temperature and time ranges. The experimental conditions for 2:1 type clay mineral synthesis were in most cases similar to 1:1 type clay minerals, with in addition acidic pH and oxidizing conditions. The most commonly used methods for identifying and characterizing these minerals are X-ray diffraction, infra-red and Mossbauer spectroscopies as well as transmission electron microscopy. The thermodynamic stability of synthesized phases, as well as the reason for elements adopting a definite configuration and distribution in solid phase remain open questions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Examples in materials science and in geology show an interest for iron-rich tri-octahedral clay mineral synthesis in large amounts and with well-defined characteristics. This review summarizes previously reported methods and conditions for iron-rich tri-octahedral clay mineral synthesis. Two approaches of hydrothermal synthesis have been applied: using gel or solid precursors. The most common synthesis approach is the hydrothermal synthesis using gel precursor. The synthesis of 1:1 type clay minerals were performed in reducing conditions in neutral or alkaline pH at various temperature and time ranges. The experimental conditions for 2:1 type clay mineral synthesis were in most cases similar to 1:1 type clay minerals, with in addition acidic pH and oxidizing conditions. The most commonly used methods for identifying and characterizing these minerals are X-ray diffraction, infra-red and Mossbauer spectroscopies as well as transmission electron microscopy. The thermodynamic stability of synthesized phases, as well as the reason for elements adopting a definite configuration and distribution in solid phase remain open questions. |
Pichavant, Loic; Lacroix-Desmazes, Patrick; Chemtob, Abraham; Pinaud, Julien; Heroguez, Valerie Photolatent ring-opening metathesis polymerization in miniemulsion: a powerful approach to produce polynorbornene latexes (Article de journal) Polymer Chemistry, 9 (46), 2018. @article{Pichavant2018, title = {Photolatent ring-opening metathesis polymerization in miniemulsion: a powerful approach to produce polynorbornene latexes}, author = { Loic Pichavant and Patrick Lacroix-Desmazes and Abraham Chemtob and Julien Pinaud and Valerie Heroguez}, doi = {10.1039/c8py01011k}, year = {2018}, date = {2018-12-01}, journal = {Polymer Chemistry}, volume = {9}, number = {46}, abstract = {The use of miniemulsion Ring-Opening Metathesis Polymerization (ROMP) to form polyunsaturated latexes is still a largely unexplored field. The main obstacle remains the preparation of a chemically-stable monomer/catalyst miniemulsion, which is generally jeopardized by the high reactivity of ROMP catalysts at ambient temperature. To overcome this drawback, a photo-latent ROMP catalytic system has been employed for the first time. Our approach starts with an N-heterocyclic carbene (NHC) photogenerating system (1,3-bis(mesityl)imidazolium tetraphenylborate/2-isopropylthioxanthone) which enables the in situ formation of an active NHC-derived Ru catalyst. The ability to initiate the ROMP in miniemulsion by a photoactive route depends on the absorption conditions of the initial formulation due to irradiation attenuation by scattering. In this article, the optimization of an aqueous norbornene miniemulsion in order to improve the irradiation penetration depth is presented in the first part. In the second part, the miniemulsion ROMP is investigated by using the NHC photogenerating system and two ruthenium complex pre-catalyst [RuX2(p-cymene)] dimers (X = Cl or I). Stable PNb latexes with particle size in the range of 100 nm were obtained.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The use of miniemulsion Ring-Opening Metathesis Polymerization (ROMP) to form polyunsaturated latexes is still a largely unexplored field. The main obstacle remains the preparation of a chemically-stable monomer/catalyst miniemulsion, which is generally jeopardized by the high reactivity of ROMP catalysts at ambient temperature. To overcome this drawback, a photo-latent ROMP catalytic system has been employed for the first time. Our approach starts with an N-heterocyclic carbene (NHC) photogenerating system (1,3-bis(mesityl)imidazolium tetraphenylborate/2-isopropylthioxanthone) which enables the in situ formation of an active NHC-derived Ru catalyst. The ability to initiate the ROMP in miniemulsion by a photoactive route depends on the absorption conditions of the initial formulation due to irradiation attenuation by scattering. In this article, the optimization of an aqueous norbornene miniemulsion in order to improve the irradiation penetration depth is presented in the first part. In the second part, the miniemulsion ROMP is investigated by using the NHC photogenerating system and two ruthenium complex pre-catalyst [RuX2(p-cymene)] dimers (X = Cl or I). Stable PNb latexes with particle size in the range of 100 nm were obtained. |
Schmitt, Michael; Becker, Dennis; Lalevee, Jacques Performance analysis of the solidification of acrylic esters photo-initiated by systematically modified ZnO nanoparticles (Article de journal) Polymer, 158 , p. 83–89, 2018. @article{Schmitt2018a, title = {Performance analysis of the solidification of acrylic esters photo-initiated by systematically modified ZnO nanoparticles}, author = { Michael Schmitt and Dennis Becker and Jacques Lalevee}, doi = {10.1016/j.polymer.2018.10.048}, year = {2018}, date = {2018-12-01}, journal = {Polymer}, volume = {158}, pages = {83--89}, abstract = {Photo-induced polymerization by nanomaterials and their analyses are challenging topics with combines multiple fields of research. The first one, the preparation/characterization of surface modified ZnO nanoparticles is by far the most obvious one. Photosensitive semiconductors can lead to a replacement of migrating initiators by non-migrating nanoscaled photo-initiators (NanoPI) for radical polymerization. The class of NanoPI is especially promising to be applicable in printing/coating applications to result in organic inorganic hybrid materials and to reduce health risks by reducing/preventing contamination of the surroundings by gas-phase transfer, by diffusion of reacted/remaining compounds (migration) and so on. The polymer related area of the research (analysis of the kinetic) is the main part of the discussion within this contribution. The reactivity of the particles to initiate free-radical polymerization of bulk printable resin mixtures (the performance of the curing) is proven for LED@ 365 nm and simulated LED illumination. Finally, the novel kinetic analysis method, the transmission UV-vis solidification is explained in detail within the present manuscript.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Photo-induced polymerization by nanomaterials and their analyses are challenging topics with combines multiple fields of research. The first one, the preparation/characterization of surface modified ZnO nanoparticles is by far the most obvious one. Photosensitive semiconductors can lead to a replacement of migrating initiators by non-migrating nanoscaled photo-initiators (NanoPI) for radical polymerization. The class of NanoPI is especially promising to be applicable in printing/coating applications to result in organic inorganic hybrid materials and to reduce health risks by reducing/preventing contamination of the surroundings by gas-phase transfer, by diffusion of reacted/remaining compounds (migration) and so on. The polymer related area of the research (analysis of the kinetic) is the main part of the discussion within this contribution. The reactivity of the particles to initiate free-radical polymerization of bulk printable resin mixtures (the performance of the curing) is proven for LED@ 365 nm and simulated LED illumination. Finally, the novel kinetic analysis method, the transmission UV-vis solidification is explained in detail within the present manuscript. |
Bruneau, Marion; Bennici, Simona; Brendle, Jocelyne; Dutournie, Patrick; Limousy, Lionel; Pluchon, Sylvain Systems for stimuli-controlled release: Materials and applications. (Article de journal) Journal of controlled release : official journal of the Controlled Release Society, 294 , p. 355–371, 2018. @article{Bruneau2018, title = {Systems for stimuli-controlled release: Materials and applications.}, author = { Marion Bruneau and Simona Bennici and Jocelyne Brendle and Patrick Dutournie and Lionel Limousy and Sylvain Pluchon}, doi = {10.1016/j.jconrel.2018.12.038}, year = {2018}, date = {2018-12-01}, journal = {Journal of controlled release : official journal of the Controlled Release Society}, volume = {294}, pages = {355--371}, abstract = {The design and development of delivery controlled systems of molecules of interest has attracted great interest over the last years. pH variation, light irradiation, temperature increasing, variation of the redox potential and the application of a magnetic field are among the most widely used stimuli that can be used to induce the release of an active molecule in a medium. The dominance of pH and photo-controlled release is clearly highlighted by the numerous articles published in these fields as well as all the related applications. In the case of pH-controlled release, two main parameters govern the release: the solubility of the active molecule in the releasing medium and the stability of the carrier materials. In the photo-controlled release, the carrier needs to contain a photosensible functionality; this stimulus can be successfully applied in the medical field when red light, that is able to penetrate the human tissues, is used. A large panel of applications of controlled release can be identified in the pharmaceuticals, agriculture, cosmetics, chemistry and dyes industry fields. More recently, biological, enzymatic, and mechanical (ultrasounds, stretching, shear stress) stimuli have been developed for target applications, in particular for drugs and hormones release. Consequently, many types of materials (polymers, silica, oxides, MOF) can be used as carrier in relation to their compatibility with the active molecule and the type of releasing medium. This review aims to gives a useful overview on the materials, applications and mechanisms implied in stimuli-controlled release.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The design and development of delivery controlled systems of molecules of interest has attracted great interest over the last years. pH variation, light irradiation, temperature increasing, variation of the redox potential and the application of a magnetic field are among the most widely used stimuli that can be used to induce the release of an active molecule in a medium. The dominance of pH and photo-controlled release is clearly highlighted by the numerous articles published in these fields as well as all the related applications. In the case of pH-controlled release, two main parameters govern the release: the solubility of the active molecule in the releasing medium and the stability of the carrier materials. In the photo-controlled release, the carrier needs to contain a photosensible functionality; this stimulus can be successfully applied in the medical field when red light, that is able to penetrate the human tissues, is used. A large panel of applications of controlled release can be identified in the pharmaceuticals, agriculture, cosmetics, chemistry and dyes industry fields. More recently, biological, enzymatic, and mechanical (ultrasounds, stretching, shear stress) stimuli have been developed for target applications, in particular for drugs and hormones release. Consequently, many types of materials (polymers, silica, oxides, MOF) can be used as carrier in relation to their compatibility with the active molecule and the type of releasing medium. This review aims to gives a useful overview on the materials, applications and mechanisms implied in stimuli-controlled release. |
Schejn, Aleksandra; Ott, Murielle; Dabert, Marine; Vidal, Loic; Balan, Lavinia Photo-induced design of reflective metallized gold@polymer coatings with tuned architecture (Article de journal) Materials & Design, 160 , p. 74–83, 2018. @article{Schejn2018, title = {Photo-induced design of reflective metallized gold@polymer coatings with tuned architecture}, author = { Aleksandra Schejn and Murielle Ott and Marine Dabert and Loic Vidal and Lavinia Balan}, doi = {10.1016/j.matdes.2018.08.051}, year = {2018}, date = {2018-12-01}, journal = {Materials & Design}, volume = {160}, pages = {74--83}, abstract = {This paper presents an efficient, eco-friendly, low cost and totally photo-induced approach to obtain new gold metallized coatings with highly reflective feature. Depending on gold precursor used and experimental conditions, the metal nanoparticles are distributed full depth or concentrated at the surface of the polymer matrix. The spatial organization and distribution of gold nanoparticles (AuNPs) is obtained through a perfect tuning of two concurrent processes, i.e. photo-polymerization of the binder and photo-reduction of the gold precursor to Au(0) nanoparticles, the balance of which is influenced depthwise, by internal filter effects associated to the absorption of gold particles or precursor. Two distinct classes of architectures were obtained. One of them was a bi-layered coating, i.e. a polymer rich sub-layer with a metal cover layer with a sharp delimitation between them; as for itself, the second type of metal@polymer coating exhibited a clear depthwise gradient of Au NPs concentration with a quasi-compact metal layer at the air surface. The mechanisms underlying these two types of architectures are discussed. The metal@polymer coatings developed with this innovative approach are full of promise in many fields of application such as large scale functionalized surfaces, adaptive optical devices (plasmonic and mirror), flexible conductive surfaces and aesthetics. (C) 2018 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents an efficient, eco-friendly, low cost and totally photo-induced approach to obtain new gold metallized coatings with highly reflective feature. Depending on gold precursor used and experimental conditions, the metal nanoparticles are distributed full depth or concentrated at the surface of the polymer matrix. The spatial organization and distribution of gold nanoparticles (AuNPs) is obtained through a perfect tuning of two concurrent processes, i.e. photo-polymerization of the binder and photo-reduction of the gold precursor to Au(0) nanoparticles, the balance of which is influenced depthwise, by internal filter effects associated to the absorption of gold particles or precursor. Two distinct classes of architectures were obtained. One of them was a bi-layered coating, i.e. a polymer rich sub-layer with a metal cover layer with a sharp delimitation between them; as for itself, the second type of metal@polymer coating exhibited a clear depthwise gradient of Au NPs concentration with a quasi-compact metal layer at the air surface. The mechanisms underlying these two types of architectures are discussed. The metal@polymer coatings developed with this innovative approach are full of promise in many fields of application such as large scale functionalized surfaces, adaptive optical devices (plasmonic and mirror), flexible conductive surfaces and aesthetics. (C) 2018 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license. |
Confalonieri, Giorgia; Ryzhikov, Andrey; Arletti, Rossella; Nouali, Habiba; Quartieri, Simona; Daou, Jean T; Patarin, Joel Intrusion-Extrusion of Electrolyte Aqueous Solutions in Pure Silica Chabazite by in Situ High Pressure Synchrotron X-ray Powder Diffraction (Article de journal) Journal of Physical Chemistry C, 122 (49), p. 28001–28012, 2018. @article{Confalonieri2018, title = {Intrusion-Extrusion of Electrolyte Aqueous Solutions in Pure Silica Chabazite by in Situ High Pressure Synchrotron X-ray Powder Diffraction}, author = { Giorgia Confalonieri and Andrey Ryzhikov and Rossella Arletti and Habiba Nouali and Simona Quartieri and T. Jean Daou and Joel Patarin}, doi = {10.1021/acs.jpcc.8b07338}, year = {2018}, date = {2018-12-01}, journal = {Journal of Physical Chemistry C}, volume = {122}, number = {49}, pages = {28001--28012}, abstract = {We have performed a structural investigation of the high pressure intrusion/extrusion of a series of electrolyte aqueous solutions (NaCl, NaBr, and CaCl2) with different concentrations (2 and 3 M) in a pure-silica chabazite. In situ synchrotron X-ray powder diffraction experiments were performed in the pressure range of 0.12-2.6 GPa and upon pressure release, to unravel the interactions among intruded species and host material. The energetic performances of the systems were determined by porosimetric studies. Results show that the chemical nature of saline solution influences the intrusion-extrusion pressure, whereas the structural evolutions undergone by the systems upon pressure-induced intrusion are essentially independent of the nature of the penetrating media. Moreover, the initial electrolyte concentration influences only the value of the intrusion pressure, but neither the amount nor the interaction mode of the intruded species. Both water and salt molecules enter the pores and the penetration of comparable extra-framework volumes occurs at similar pressure values. However, the composition of the intruded species is different from that of the initial solution and depends on the applied pressure, thus reinforcing the hypothesis on ion desolvation under penetration into the pores. After pressure release, pure-silica chabazite intruded by NaCl and NaBr aqueous solutions does not recover the initial cell volume and partially retains the intruded extra-framework species. On the contrary, the zeolite intruded by CaCl2 recovers the original cell parameters. These differences have been structurally interpreted on the basis of the electrolyte/zeolite interactions. Interestingly, the extrusion behavior was found to be mainly determined by the interactions of the anion with silanol defects of the chabazite framework, rather than by the coordination bonds of the cation with the framework oxygen atoms.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We have performed a structural investigation of the high pressure intrusion/extrusion of a series of electrolyte aqueous solutions (NaCl, NaBr, and CaCl2) with different concentrations (2 and 3 M) in a pure-silica chabazite. In situ synchrotron X-ray powder diffraction experiments were performed in the pressure range of 0.12-2.6 GPa and upon pressure release, to unravel the interactions among intruded species and host material. The energetic performances of the systems were determined by porosimetric studies. Results show that the chemical nature of saline solution influences the intrusion-extrusion pressure, whereas the structural evolutions undergone by the systems upon pressure-induced intrusion are essentially independent of the nature of the penetrating media. Moreover, the initial electrolyte concentration influences only the value of the intrusion pressure, but neither the amount nor the interaction mode of the intruded species. Both water and salt molecules enter the pores and the penetration of comparable extra-framework volumes occurs at similar pressure values. However, the composition of the intruded species is different from that of the initial solution and depends on the applied pressure, thus reinforcing the hypothesis on ion desolvation under penetration into the pores. After pressure release, pure-silica chabazite intruded by NaCl and NaBr aqueous solutions does not recover the initial cell volume and partially retains the intruded extra-framework species. On the contrary, the zeolite intruded by CaCl2 recovers the original cell parameters. These differences have been structurally interpreted on the basis of the electrolyte/zeolite interactions. Interestingly, the extrusion behavior was found to be mainly determined by the interactions of the anion with silanol defects of the chabazite framework, rather than by the coordination bonds of the cation with the framework oxygen atoms. |
Bonardi, Aude-Heloise; Dumur, Frederic; Noirbent, Guillaume; Lalevee, Jacques; Gigmes, Didier Organometallic vs organic photoredox catalysts for photocuring reactions in the visible region (Article de journal) Beilstein Journal of Organic Chemistry, 14 , p. 3025–3046, 2018. @article{Bonardi2018b, title = {Organometallic vs organic photoredox catalysts for photocuring reactions in the visible region}, author = { Aude-Heloise Bonardi and Frederic Dumur and Guillaume Noirbent and Jacques Lalevee and Didier Gigmes}, doi = {10.3762/bjoc.14.282}, year = {2018}, date = {2018-12-01}, journal = {Beilstein Journal of Organic Chemistry}, volume = {14}, pages = {3025--3046}, abstract = {Recent progresses achieved in terms of synthetic procedures allow now the access to polymers of well-defined composition, molecular weight and architecture. Thanks to these recent progresses in polymer engineering, the scope of applications of polymers is far wider than that of any other class of material, ranging from adhesives, coatings, packaging materials, inks, paints, optics, 3D printing, microelectronics or textiles. From a synthetic viewpoint, photoredox catalysis, originally developed for organic chemistry, has recently been applied to the polymer synthesis, constituting a major breakthrough in polymer chemistry. Thanks to the development of photoredox catalysts of polymerization, a drastic reduction of the amount of photoinitiators could be achieved, addressing the toxicity and the extractability issues; high performance initiating abilities are still obtained due to the catalytic approach which regenerates the catalyst. As it is a fast-growing field, this review will be mainly focused on an overview of the recent advances concerning the development of organic and organometallic photoredox catalysts for the photoreticulation of multifunctional monomers for a rapid and efficient access to 3D polymer networks.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Recent progresses achieved in terms of synthetic procedures allow now the access to polymers of well-defined composition, molecular weight and architecture. Thanks to these recent progresses in polymer engineering, the scope of applications of polymers is far wider than that of any other class of material, ranging from adhesives, coatings, packaging materials, inks, paints, optics, 3D printing, microelectronics or textiles. From a synthetic viewpoint, photoredox catalysis, originally developed for organic chemistry, has recently been applied to the polymer synthesis, constituting a major breakthrough in polymer chemistry. Thanks to the development of photoredox catalysts of polymerization, a drastic reduction of the amount of photoinitiators could be achieved, addressing the toxicity and the extractability issues; high performance initiating abilities are still obtained due to the catalytic approach which regenerates the catalyst. As it is a fast-growing field, this review will be mainly focused on an overview of the recent advances concerning the development of organic and organometallic photoredox catalysts for the photoreticulation of multifunctional monomers for a rapid and efficient access to 3D polymer networks. |
Aubry, Berengere; Subervie, Daniel; Lansalot, Muriel; Bourgeat-Lami, Elodie; Graff, Bernadette; Morlet-Savary, Fabrice; Dietlin, Celine; Fouassier, Jean-Pierre; Lacote, Emmanuel; Lalevee, Jacques A Second-Generation Chameleon N-Heterocyclic Carbene-Borane Coinitiator for the Visible-Light Oxygen-Resistant Photopolymerization of Both Organic and Water-Compatible Resins (Article de journal) Macromolecules, 51 (23), p. 9730–9739, 2018. @article{Aubry2018, title = {A Second-Generation Chameleon N-Heterocyclic Carbene-Borane Coinitiator for the Visible-Light Oxygen-Resistant Photopolymerization of Both Organic and Water-Compatible Resins}, author = { Berengere Aubry and Daniel Subervie and Muriel Lansalot and Elodie Bourgeat-Lami and Bernadette Graff and Fabrice Morlet-Savary and Celine Dietlin and Jean-Pierre Fouassier and Emmanuel Lacote and Jacques Lalevee}, doi = {10.1021/acs.macromol.8b01669}, year = {2018}, date = {2018-12-01}, journal = {Macromolecules}, volume = {51}, number = {23}, pages = {9730--9739}, abstract = {N-Heterocyclic carbene-boranes (NHC-boranes, NHCBs) were recently described as efficient coinitiators for the visible light photopolymerization of hydroxyethyl methacrylate (HEMA) in the presence of water. In this work, a new, more water-soluble, NHC-borane-2,4-dimethyl-1,2,4,5-tetrazol-3-ylidene borane-has been synthesized, and its efficiency in three-component systems (dye (Acridine Orange), disulfide, and NHC-borane coinitiators) for the polymerization of methacrylate resins under visible light under air has been studied. In fluid resins this new photoinitiating system (PIS) gives better results than the one previously studied. More importantly, this system is competitive with the widely used type II system-camphorquinone/4-(dimethylamino)benzonitrile (DMABN)-for the polymerization of methacrylate resins but better for the photopolymerization of poly(2-hydroxyethyl methacrylate) leading to hydrogels, where the former PIS fails. The excellent ability of the NHC-boranes, and especially the new one, to be used as photopolymerization coinitiators has been analyzed by laser flash photolysis (LFP). The rate constants for elementary reactions of the three boranes and their derived NHC-boryl radicals obtained by LFP correlated well with the molecular modeling data and show that the key for the observed reactivity is the ability of the tetrazolydinyl NHC-borane to repair the peroxyl radicals formed by the reactions of the macroradicals with oxygen.}, keywords = {}, pubstate = {published}, tppubtype = {article} } N-Heterocyclic carbene-boranes (NHC-boranes, NHCBs) were recently described as efficient coinitiators for the visible light photopolymerization of hydroxyethyl methacrylate (HEMA) in the presence of water. In this work, a new, more water-soluble, NHC-borane-2,4-dimethyl-1,2,4,5-tetrazol-3-ylidene borane-has been synthesized, and its efficiency in three-component systems (dye (Acridine Orange), disulfide, and NHC-borane coinitiators) for the polymerization of methacrylate resins under visible light under air has been studied. In fluid resins this new photoinitiating system (PIS) gives better results than the one previously studied. More importantly, this system is competitive with the widely used type II system-camphorquinone/4-(dimethylamino)benzonitrile (DMABN)-for the polymerization of methacrylate resins but better for the photopolymerization of poly(2-hydroxyethyl methacrylate) leading to hydrogels, where the former PIS fails. The excellent ability of the NHC-boranes, and especially the new one, to be used as photopolymerization coinitiators has been analyzed by laser flash photolysis (LFP). The rate constants for elementary reactions of the three boranes and their derived NHC-boryl radicals obtained by LFP correlated well with the molecular modeling data and show that the key for the observed reactivity is the ability of the tetrazolydinyl NHC-borane to repair the peroxyl radicals formed by the reactions of the macroradicals with oxygen. |
Schobing, Julie; Tschamber, Valerie; Brillard, Alain; Leyssens, Gontrand; Iojoiu, Eduard; Lauga, Vincent Impact of engine operating cycle, biodiesel blends and fuel impurities on soot production and soot characteristics (Article de journal) Combustion and Flame, 198 , p. 1–13, 2018. @article{Schobing2018, title = {Impact of engine operating cycle, biodiesel blends and fuel impurities on soot production and soot characteristics}, author = { Julie Schobing and Valerie Tschamber and Alain Brillard and Gontrand Leyssens and Eduard Iojoiu and Vincent Lauga}, doi = {10.1016/j.combustflame.2018.08.025}, year = {2018}, date = {2018-12-01}, journal = {Combustion and Flame}, volume = {198}, pages = {1--13}, abstract = {The impact of engine operating cycle, Biodiesel blends and fuel impurities on soot production and soot properties are evaluated in the present work. To this end, soot were produced on engine test bench and then collected inside a Diesel Particulate Filter (DPF). Two engine cycles (a Natural Loading and an Accelerated Loading) were tested. A standard Euro VI fuel blended with 7% of Biodiesel (B7) and a pure Biofuel (B100 RME EN 14214) were used. This latter was additivated with potassium and phosphorus at a low (B100(+)) or at a high (B100(++)) concentration. Soot characterization through elemental analyses, nitrogen adsorption, Raman spectroscopy, TGA and TPO experiments show that the engine operating cycle impact the soot reactivity through modifications of their texture and structure. Test bench experiments also show that increasing Biodiesel blend from B7 to B100(+) divides by five the soot production. Moreover, soot obtained with B100(+) are more reactive because of higher oxygen and ash content. When the inorganic content of the fuel is increased, few effects on the soot production are observed but the soot reactivity is significantly increased. In fact, analyses highlight that impurities present in the fuel are retrieved inside the soot composition and then catalyze their oxidation. K has a beneficial effect on both passive and active regenerations. On the contrary, P inhibits the active regeneration but has a significant catalytic impact on the C-NO2-H2O reaction. Finally, a numerical simulation allows to extract the kinetic constants of real B7- and B100(+)-soot, whose values confirm the differences of the soot reactivity. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The impact of engine operating cycle, Biodiesel blends and fuel impurities on soot production and soot properties are evaluated in the present work. To this end, soot were produced on engine test bench and then collected inside a Diesel Particulate Filter (DPF). Two engine cycles (a Natural Loading and an Accelerated Loading) were tested. A standard Euro VI fuel blended with 7% of Biodiesel (B7) and a pure Biofuel (B100 RME EN 14214) were used. This latter was additivated with potassium and phosphorus at a low (B100(+)) or at a high (B100(++)) concentration. Soot characterization through elemental analyses, nitrogen adsorption, Raman spectroscopy, TGA and TPO experiments show that the engine operating cycle impact the soot reactivity through modifications of their texture and structure. Test bench experiments also show that increasing Biodiesel blend from B7 to B100(+) divides by five the soot production. Moreover, soot obtained with B100(+) are more reactive because of higher oxygen and ash content. When the inorganic content of the fuel is increased, few effects on the soot production are observed but the soot reactivity is significantly increased. In fact, analyses highlight that impurities present in the fuel are retrieved inside the soot composition and then catalyze their oxidation. K has a beneficial effect on both passive and active regenerations. On the contrary, P inhibits the active regeneration but has a significant catalytic impact on the C-NO2-H2O reaction. Finally, a numerical simulation allows to extract the kinetic constants of real B7- and B100(+)-soot, whose values confirm the differences of the soot reactivity. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved. |
Abdallah, Mira; Le, Huong; Hijazi, Akram; Schmitt, Michael; Graff, Bernadette; Dumur, Frederic; Bui, Thanh-Tuan; Goubard, Fabrice; Fouassier, Jean-Pierre; Lalevee, Jacques Acridone derivatives as high performance visible light photoinitiators for cationic and radical photosensitive resins for 3D printing technology and for low migration photopolymer property (Article de journal) Polymer, 159 , p. 47–58, 2018. @article{Abdallah2018, title = {Acridone derivatives as high performance visible light photoinitiators for cationic and radical photosensitive resins for 3D printing technology and for low migration photopolymer property}, author = { Mira Abdallah and Huong Le and Akram Hijazi and Michael Schmitt and Bernadette Graff and Frederic Dumur and Thanh-Tuan Bui and Fabrice Goubard and Jean-Pierre Fouassier and Jacques Lalevee}, doi = {10.1016/j.polymer.2018.11.021}, year = {2018}, date = {2018-12-01}, journal = {Polymer}, volume = {159}, pages = {47--58}, abstract = {This paper is devoted to study two acridone derivatives (A-2DPA and A-2PTz). These acridone compounds are synthesized and proposed as high performance visible light photoinitiators, in the presence of an iodonium salt or/and an amine (NPG or EDB), for both the free radical polymerization of (meth)acrylates and the cationic polymerization of epoxides upon irradiation with LED@405 nm. Excellent polymerization initiating abilities are found, and high final monomer conversions are obtained. A full picture of the involved photochemical mechanisms is provided. This paper is also concerned with the use of these acridone-based systems in new 3D printing resins. Finally, the usage of the new acridone derivatives for photopolyrners with low migration properties is particularly outlined.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper is devoted to study two acridone derivatives (A-2DPA and A-2PTz). These acridone compounds are synthesized and proposed as high performance visible light photoinitiators, in the presence of an iodonium salt or/and an amine (NPG or EDB), for both the free radical polymerization of (meth)acrylates and the cationic polymerization of epoxides upon irradiation with LED@405 nm. Excellent polymerization initiating abilities are found, and high final monomer conversions are obtained. A full picture of the involved photochemical mechanisms is provided. This paper is also concerned with the use of these acridone-based systems in new 3D printing resins. Finally, the usage of the new acridone derivatives for photopolyrners with low migration properties is particularly outlined. |
Cremoux, T; Batonneau-Gener, I; Moissette, A; Paillaud, J - L; Hureau, M; Ligner, E; Morais, C; Laforge, S; Marichal, C; Nouali, H Influence of hierarchization on electron transfers in structured MFI-type zeolites (Article de journal) Physical Chemistry Chemical Physics, 20 (42), p. 26903–26917, 2018. @article{Cremoux2018, title = {Influence of hierarchization on electron transfers in structured MFI-type zeolites}, author = { T. Cremoux and I. Batonneau-Gener and A. Moissette and J. -. L. Paillaud and M. Hureau and E. Ligner and C. Morais and S. Laforge and C. Marichal and H. Nouali}, doi = {10.1039/c8cp03485k}, year = {2018}, date = {2018-11-01}, journal = {Physical Chemistry Chemical Physics}, volume = {20}, number = {42}, pages = {26903--26917}, abstract = {H-ZSM-5 zeolite (Si/Al = 19.3) was hydrothermally synthesized. Alkaline and/or acid post-synthesis treatments were carried out to give rise to an interconnected mesoporous volume. The desilication treatment parameters have been tuned (temperature, organic base addition) to obtain a series of samples with increasing mesoporous volume and a constant number of acid sites. The physicochemical properties of the resulting materials were fully characterized by many techniques (NMR, BET, PXRD, and pyridine thermal desorption followed by infrared spectroscopy). To assess the effect of post-treatments on sample reactivity, the charge separation processes between the zeolite framework and adsorbed trans-stilbene (t-St) molecule were investigated by UV-visible diffuse reflectance. The spectra obtained after t-St adsorption show clear differences depending on the applied post-treatments. It appears that the desilication treatments performed without acidic washing highly stabilize the radical cation resulting from the t-St spontaneous ionization. In contrast, by applying acidic washing after desilication, the ionization process becomes significantly weaker. The results show that the proportion of strong Lewis acid sites in the vicinity of Bronsted sites named Bronsted Strong Lewis Pairs (BSLP), are responsible for the amount of radical cations observed in the different samples. More precisely, it exists an optimal proportion of BSLP to achieve a high ionization rate. On the basis of the experimental results a mechanism for the formation of the t-St radical cation and the charge transfer complex (CTC) is proposed.}, keywords = {}, pubstate = {published}, tppubtype = {article} } H-ZSM-5 zeolite (Si/Al = 19.3) was hydrothermally synthesized. Alkaline and/or acid post-synthesis treatments were carried out to give rise to an interconnected mesoporous volume. The desilication treatment parameters have been tuned (temperature, organic base addition) to obtain a series of samples with increasing mesoporous volume and a constant number of acid sites. The physicochemical properties of the resulting materials were fully characterized by many techniques (NMR, BET, PXRD, and pyridine thermal desorption followed by infrared spectroscopy). To assess the effect of post-treatments on sample reactivity, the charge separation processes between the zeolite framework and adsorbed trans-stilbene (t-St) molecule were investigated by UV-visible diffuse reflectance. The spectra obtained after t-St adsorption show clear differences depending on the applied post-treatments. It appears that the desilication treatments performed without acidic washing highly stabilize the radical cation resulting from the t-St spontaneous ionization. In contrast, by applying acidic washing after desilication, the ionization process becomes significantly weaker. The results show that the proportion of strong Lewis acid sites in the vicinity of Bronsted sites named Bronsted Strong Lewis Pairs (BSLP), are responsible for the amount of radical cations observed in the different samples. More precisely, it exists an optimal proportion of BSLP to achieve a high ionization rate. On the basis of the experimental results a mechanism for the formation of the t-St radical cation and the charge transfer complex (CTC) is proposed. |
Bonardi, A - H; Bonardi, F; Morlet-Savary, F; Dietlin, C; Noirbent, G; Grant, T M; Fouassier, J - P; Dumur, F; Lessard, B H; Gigmes, D; Lalevee, J Photoinduced Thermal Polymerization Reactions (Article de journal) Macromolecules, 51 (21), p. 8808–8820, 2018. @article{Bonardi2018a, title = {Photoinduced Thermal Polymerization Reactions}, author = { A. -. H. Bonardi and F. Bonardi and F. Morlet-Savary and C. Dietlin and G. Noirbent and T. M. Grant and J. -. P. Fouassier and F. Dumur and B. H. Lessard and D. Gigmes and J. Lalevee}, doi = {10.1021/acs.macromol.8b01741}, year = {2018}, date = {2018-11-01}, journal = {Macromolecules}, volume = {51}, number = {21}, pages = {8808--8820}, abstract = {The combination of thermally induced and photoinduced free radical polymerization of (meth)acrylic monomers has only been scarcely presented in the literature. In this study, a two-component system with a near- acts as a very efficient heat generator (heater) upon irradiation with NIR light. infrared (NIR) dye combined with a thermal initiator is presented. The dye Several thermal initiators are presented such as an alkoxyamine (e.g., BlocBuilder-MA), azo derivatives, and (hydro)peroxides. The heat delivered by the dye dissociates the thermal initiator, which initiates the free radical polymerization of (meth)acrylates. Several types of heat generators are presented such as borate-based dyes and a silicon phthalocyanine derivative. For the first time, the effects of the NIR heater concentration, light intensity, and monomer structure on the heat released are studied using thermal imaging studies. NIR light curing is challenging but offers significant advantages: it is safer than shorter wavelength, and it allows a deeper penetration of the light and therefore a better curing of filled samples for a unique access to composites. Systems using a cyanine borate as a dye give high conversion rate of C=C for methacrylate monomer under air. Two wavelengths of irradiation are studied: 785 and 850 nm. The presence of additives (phosphines or iodonium salts) can also improve the polymerization profiles.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The combination of thermally induced and photoinduced free radical polymerization of (meth)acrylic monomers has only been scarcely presented in the literature. In this study, a two-component system with a near- acts as a very efficient heat generator (heater) upon irradiation with NIR light. infrared (NIR) dye combined with a thermal initiator is presented. The dye Several thermal initiators are presented such as an alkoxyamine (e.g., BlocBuilder-MA), azo derivatives, and (hydro)peroxides. The heat delivered by the dye dissociates the thermal initiator, which initiates the free radical polymerization of (meth)acrylates. Several types of heat generators are presented such as borate-based dyes and a silicon phthalocyanine derivative. For the first time, the effects of the NIR heater concentration, light intensity, and monomer structure on the heat released are studied using thermal imaging studies. NIR light curing is challenging but offers significant advantages: it is safer than shorter wavelength, and it allows a deeper penetration of the light and therefore a better curing of filled samples for a unique access to composites. Systems using a cyanine borate as a dye give high conversion rate of C=C for methacrylate monomer under air. Two wavelengths of irradiation are studied: 785 and 850 nm. The presence of additives (phosphines or iodonium salts) can also improve the polymerization profiles. |
Garra, Patxi; Baralle, Alexandre; Graff, Bernadette; Schrodj, Gautier; Morlet-Savary, Fabrice; Dietlin, Celine; Fouassier, Jean-Pierre; Lalevee, Jacques Radical Cations in Versatile High Performance Initiating Systems for Thermal, Redox, and Photopolymerizations (Article de journal) Macromolecules, 51 (21), p. 8899–8911, 2018. @article{Garra2018k, title = {Radical Cations in Versatile High Performance Initiating Systems for Thermal, Redox, and Photopolymerizations}, author = { Patxi Garra and Alexandre Baralle and Bernadette Graff and Gautier Schrodj and Fabrice Morlet-Savary and Celine Dietlin and Jean-Pierre Fouassier and Jacques Lalevee}, doi = {10.1021/acs.macromol.8b01975}, year = {2018}, date = {2018-11-01}, journal = {Macromolecules}, volume = {51}, number = {21}, pages = {8899--8911}, abstract = {Highly versatile initiating systems for thermal, redox, and photopolymerization processes are proposed. The photopolymerization using the multifunctional amine tris[4-(diethylamino)phenyl]amine (t4epa) and iodonium salt (Iod) as photoinitiating system (PIS) is presented. Methacrylate function conversion up to 84% was reached under LED@850 nm using t4epa/Iod/phosphine PIS when only 60% was possible for the same resin using a commercial camphorquinone/amine/phosphines blue light (470 nm) PIS showing that longer wavelengths can be used with high final performances. Estimation of the balance between photothermal vs photoinduced electron transfer processes to initiate polymerization was performed exhaustively thanks to thermal imaging, Raman confocal microscopy, FTIR, cyclic voltammetry, UV-vis-NIR spectroscopy, ESR, ESR-ST photolysis, DSC, photo-DSC, and molecular modeling. This method can be used in further works interested in photochemical/thermal processes as it allowed to highlight two unusual reactivity features: (i) the in situ creation of a bicomponent thermal initiator (potentially occurring in several other systems) and (ii) the estimation of light-induced heating rates. Remarkably, a NIR light-absorbing radical cation is responsible for the photoreaction and the high photoinitiating performance. Interestingly, in parallel and without light, the first pure organic peroxide-free redox radical initiating system based on the proposed t4epa/Iod combination will be presented; that is, performances similar to or better than harmful/unstable peroxide-based redox (or thermal) initiating systems are obtained.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Highly versatile initiating systems for thermal, redox, and photopolymerization processes are proposed. The photopolymerization using the multifunctional amine tris[4-(diethylamino)phenyl]amine (t4epa) and iodonium salt (Iod) as photoinitiating system (PIS) is presented. Methacrylate function conversion up to 84% was reached under LED@850 nm using t4epa/Iod/phosphine PIS when only 60% was possible for the same resin using a commercial camphorquinone/amine/phosphines blue light (470 nm) PIS showing that longer wavelengths can be used with high final performances. Estimation of the balance between photothermal vs photoinduced electron transfer processes to initiate polymerization was performed exhaustively thanks to thermal imaging, Raman confocal microscopy, FTIR, cyclic voltammetry, UV-vis-NIR spectroscopy, ESR, ESR-ST photolysis, DSC, photo-DSC, and molecular modeling. This method can be used in further works interested in photochemical/thermal processes as it allowed to highlight two unusual reactivity features: (i) the in situ creation of a bicomponent thermal initiator (potentially occurring in several other systems) and (ii) the estimation of light-induced heating rates. Remarkably, a NIR light-absorbing radical cation is responsible for the photoreaction and the high photoinitiating performance. Interestingly, in parallel and without light, the first pure organic peroxide-free redox radical initiating system based on the proposed t4epa/Iod combination will be presented; that is, performances similar to or better than harmful/unstable peroxide-based redox (or thermal) initiating systems are obtained. |
Moussa, Hatem; Chouchene, Bilel; Gries, Thomas; Balan, Lavinia; Mozet, Kevin; Medjahdi, Ghouti; Schneider, Raphael Growth of ZnO Nanorods on Graphitic Carbon Nitride gCN Sheets for the Preparation of Photocatalysts with High Visible-Light Activity (Article de journal) Chemcatchem, 10 (21), p. 4987–4997, 2018. @article{Moussa2018, title = {Growth of ZnO Nanorods on Graphitic Carbon Nitride gCN Sheets for the Preparation of Photocatalysts with High Visible-Light Activity}, author = { Hatem Moussa and Bilel Chouchene and Thomas Gries and Lavinia Balan and Kevin Mozet and Ghouti Medjahdi and Raphael Schneider}, doi = {10.1002/cctc.201801206}, year = {2018}, date = {2018-11-01}, journal = {Chemcatchem}, volume = {10}, number = {21}, pages = {4987--4997}, abstract = {The light photoresponse, the separation of photogenerated charge carriers and the specific surface area are of great importance for the development of semiconductor-based photocatalysts. We report the anchorage of small-sized ZnO nanorods with a length of ca. 38 nm at the surface of graphitic carbon nitride (gCN) sheets. The gCN loading in the ZnO/gCN composites was varied and the materials characterized by TEM, XRD, XPS, BET and UV-vis diffuse reflectance spectroscopy. The ZnO/gCN (10 %) composite exhibits a high photocatalytic activity for the degradation of dyes (Orange II, Resazurin and Reactive Black 5) under visible light irradiation of low intensity (2.5 mW/cm(2)) and for salicylic acid under simulated sunlight irradiation (5 mW/cm(2)). These results are supported by photoluminescence, photocurrent and electrochemical impedance spectroscopy measurements. The photocatalytic activity originates from synergistic effects in ZnO/gCN composites including a high specific surface area (60.4 m(2)/g), an enhanced visible light absorption capacity and the charge carriers separation. The ZnO/gCN photocatalyst exhibits a high stability and could be reused up to ten times with no loss of efficiency. A mechanism is proposed for the degradation of dyes using the ZnO/gCN composites.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The light photoresponse, the separation of photogenerated charge carriers and the specific surface area are of great importance for the development of semiconductor-based photocatalysts. We report the anchorage of small-sized ZnO nanorods with a length of ca. 38 nm at the surface of graphitic carbon nitride (gCN) sheets. The gCN loading in the ZnO/gCN composites was varied and the materials characterized by TEM, XRD, XPS, BET and UV-vis diffuse reflectance spectroscopy. The ZnO/gCN (10 %) composite exhibits a high photocatalytic activity for the degradation of dyes (Orange II, Resazurin and Reactive Black 5) under visible light irradiation of low intensity (2.5 mW/cm(2)) and for salicylic acid under simulated sunlight irradiation (5 mW/cm(2)). These results are supported by photoluminescence, photocurrent and electrochemical impedance spectroscopy measurements. The photocatalytic activity originates from synergistic effects in ZnO/gCN composites including a high specific surface area (60.4 m(2)/g), an enhanced visible light absorption capacity and the charge carriers separation. The ZnO/gCN photocatalyst exhibits a high stability and could be reused up to ten times with no loss of efficiency. A mechanism is proposed for the degradation of dyes using the ZnO/gCN composites. |
Bardon, Julien; Martin, Arnaud; Fioux, Philippe; Amari, Tassadit; Mertz, Gregory; Delmee, Maxime; Ruch, David; Roucoules, Vincent Reinforcement of a dodecylacrylate plasma polymer by admixture of a diacrylate or a dimethacrylate cross-linker (Article de journal) Plasma Processes and Polymers, 15 (11), p. e1800031, 2018. @article{Bardon2018, title = {Reinforcement of a dodecylacrylate plasma polymer by admixture of a diacrylate or a dimethacrylate cross-linker}, author = { Julien Bardon and Arnaud Martin and Philippe Fioux and Tassadit Amari and Gregory Mertz and Maxime Delmee and David Ruch and Vincent Roucoules}, doi = {10.1002/ppap.201800031}, year = {2018}, date = {2018-11-01}, journal = {Plasma Processes and Polymers}, volume = {15}, number = {11}, pages = {e1800031}, abstract = {Coatings have been deposited from acrylates and methacrylates mixtures by means of an aerosol assisted atmospheric plasma process. The reference coating precursor is dodecyl acrylate (DOCA). In order to improve the coatings mechanical properties, one diacrylate and one dimethacrylate are added to DOCA in the precursor mixture. It is expected that they act as cross-linking agents, thus modifying the coatings macromolecular structure and improving the coating mechanical properties. The influence of cross-linkers concentration on the coatings properties is investigated. An improvement of coatings scratch resistance when the concentration of cross-linkers increases in the mixture is observed, but the effect on coatings structure is different between the diacrylate and the dimethacrylate.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Coatings have been deposited from acrylates and methacrylates mixtures by means of an aerosol assisted atmospheric plasma process. The reference coating precursor is dodecyl acrylate (DOCA). In order to improve the coatings mechanical properties, one diacrylate and one dimethacrylate are added to DOCA in the precursor mixture. It is expected that they act as cross-linking agents, thus modifying the coatings macromolecular structure and improving the coating mechanical properties. The influence of cross-linkers concentration on the coatings properties is investigated. An improvement of coatings scratch resistance when the concentration of cross-linkers increases in the mixture is observed, but the effect on coatings structure is different between the diacrylate and the dimethacrylate. |
Campisi, Sebastiano; Bennici, Simona; Auroux, Aline; Carniti, Paolo; Gervasini, Antonella A Rational Revisiting of Niobium Oxophosphate Catalysts for Carbohydrate Biomass Reactions (Article de journal) Topics in Catalysis, 61 (18-19), p. 1939–1948, 2018. @article{Campisi2018, title = {A Rational Revisiting of Niobium Oxophosphate Catalysts for Carbohydrate Biomass Reactions}, author = { Sebastiano Campisi and Simona Bennici and Aline Auroux and Paolo Carniti and Antonella Gervasini}, doi = {10.1007/s11244-018-0999-x}, year = {2018}, date = {2018-11-01}, journal = {Topics in Catalysis}, volume = {61}, number = {18-19}, pages = {1939--1948}, abstract = {Niobium oxophosphate acid catalyst (NbP) has great success in aqueous heterogeneous catalysis, in particular for carbohydrate biomass valorization, thanks to the water-tolerant acid properties of the LA (Lewis) and BA (BrOnsted) sites. Attempts to tailor the acid properties of NbP by chemical treatment or dilution in inert matrix to disperse active NbP phase have been recently proposed in the literature (Carniti et al., Appl Catal B 193:93-102, 2016; Aronne et al., J Phys Chem C 121:17378-17389, 2017). The obtained samples have been used with success in the hydrolysis reaction of inulin to fructose and in hydrolysis plus dehydration of cellobiose to HMF. The samples have been further studied with calorimetric acid-titration measurements using 2-phenylethylamine (PEA) basic probe in various liquids (cyclohexane, water, isopropanol, and water-isopropanol mixtures) to study their intrinsic and effective acid strength. A rational revisiting of the surface acid properties of NbP and modified samples, that wants to take into account the acid-sites density and strength and the LAS to BAS ratios measured under different liquid environments in relation with their catalytic activity, is presented.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Niobium oxophosphate acid catalyst (NbP) has great success in aqueous heterogeneous catalysis, in particular for carbohydrate biomass valorization, thanks to the water-tolerant acid properties of the LA (Lewis) and BA (BrOnsted) sites. Attempts to tailor the acid properties of NbP by chemical treatment or dilution in inert matrix to disperse active NbP phase have been recently proposed in the literature (Carniti et al., Appl Catal B 193:93-102, 2016; Aronne et al., J Phys Chem C 121:17378-17389, 2017). The obtained samples have been used with success in the hydrolysis reaction of inulin to fructose and in hydrolysis plus dehydration of cellobiose to HMF. The samples have been further studied with calorimetric acid-titration measurements using 2-phenylethylamine (PEA) basic probe in various liquids (cyclohexane, water, isopropanol, and water-isopropanol mixtures) to study their intrinsic and effective acid strength. A rational revisiting of the surface acid properties of NbP and modified samples, that wants to take into account the acid-sites density and strength and the LAS to BAS ratios measured under different liquid environments in relation with their catalytic activity, is presented. |
Nita, Cristina; Fullenwarth, Julien; Monconduit, Laure; Meins, Jean-Marc Le; Parmentier, Julien; Sougrati, Moulay Tahar; Ghimbeu, Camelia Matei Understanding the Sn Loading Impact on the Performance of Mesoporous Carbon/Sn-Based Nanocomposites in Li-Ion Batteries (Article de journal) Chemelectrochem, 5 (21), p. 3249–3257, 2018. @article{Nita2018a, title = {Understanding the Sn Loading Impact on the Performance of Mesoporous Carbon/Sn-Based Nanocomposites in Li-Ion Batteries}, author = { Cristina Nita and Julien Fullenwarth and Laure Monconduit and Jean-Marc Le Meins and Julien Parmentier and Moulay Tahar Sougrati and Camelia Matei Ghimbeu}, doi = {10.1002/celc.201800835}, year = {2018}, date = {2018-11-01}, journal = {Chemelectrochem}, volume = {5}, number = {21}, pages = {3249--3257}, abstract = {Herein, we report a systematic study to understand the influence of the amount of tin metal precursor salt on the formation of carbon/tin hybrid materials and their performances as anodes in Li-ion batteries. Small Sn metallic particles (ca. 5 nm) covered by a SnO2 layer were uniformly dispersed in a mesoporous carbon for a low loading of tin; whereas, for higher Sn loadings, the formation of Sn-based particles aggregates (ca. 200 nm) is promoted as well. By increasing the Sn loading from 20 to 80 %, the irreversible capacity was successfully reduced and the reversible capacity improved. This could be related to the decrease of the C/Sn hybrids specific surface area and the increase of the Sn active species. For long-term cycling, capacity fading was observed, particularly for high Sn loadings assigned to the Sn nanoparticles placed outside the carbon network, which upon lithiation witness large volume expansion, leading to severe particle growth and agglomeration. Therefore, similar reversible capacities at long cycling are reached, no matter the Sn loading. For optimal electrochemical performances, it appears that a balance between the amount of Sn and uniform small Sn-based particles dispersion within carbon matrix must be assured to design high-performance anodes for Li-ion batteries.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Herein, we report a systematic study to understand the influence of the amount of tin metal precursor salt on the formation of carbon/tin hybrid materials and their performances as anodes in Li-ion batteries. Small Sn metallic particles (ca. 5 nm) covered by a SnO2 layer were uniformly dispersed in a mesoporous carbon for a low loading of tin; whereas, for higher Sn loadings, the formation of Sn-based particles aggregates (ca. 200 nm) is promoted as well. By increasing the Sn loading from 20 to 80 %, the irreversible capacity was successfully reduced and the reversible capacity improved. This could be related to the decrease of the C/Sn hybrids specific surface area and the increase of the Sn active species. For long-term cycling, capacity fading was observed, particularly for high Sn loadings assigned to the Sn nanoparticles placed outside the carbon network, which upon lithiation witness large volume expansion, leading to severe particle growth and agglomeration. Therefore, similar reversible capacities at long cycling are reached, no matter the Sn loading. For optimal electrochemical performances, it appears that a balance between the amount of Sn and uniform small Sn-based particles dispersion within carbon matrix must be assured to design high-performance anodes for Li-ion batteries. |
Peredo-Mancilla, Deneb; Ghouma, Imen; Hort, Cecile; Ghimbeu, Camelia Matei; Jeguirim, Mejdi; Bessieres, David CO2 and CH4 Adsorption Behavior of Biomass-Based Activated Carbons (Article de journal) Energies, 11 (11), p. 3136, 2018. @article{Peredo-Mancilla2018a, title = {CO2 and CH4 Adsorption Behavior of Biomass-Based Activated Carbons}, author = { Deneb Peredo-Mancilla and Imen Ghouma and Cecile Hort and Camelia Matei Ghimbeu and Mejdi Jeguirim and David Bessieres}, doi = {10.3390/en11113136}, year = {2018}, date = {2018-11-01}, journal = {Energies}, volume = {11}, number = {11}, pages = {3136}, abstract = {The aim of the present work is to study the effect of different activation methods for the production of a biomass-based activated carbon on the CO2 and CH4 adsorption. The influence of the activation method on the adsorption uptake was studied using three activated carbons obtained by different activation methods (H3PO4 chemical activation and H2O and CO2 physical activation) of olive stones. Methane and carbon dioxide pure gas adsorption experiments were carried out at two working temperatures (303.15 and 323.15 K). The influence of the activation method on the adsorption uptake was studied in terms of both textural properties and surface chemistry. For the three adsorbents, the CO2 adsorption was more important than that of CH4. The chemically-activated carbon presented a higher specific surface area and micropore volume, which led to a higher adsorption capacity of both CO2 and CH4. For methane adsorption, the presence of mesopores facilitated the diffusion of the gas molecules into the micropores. In the case of carbon dioxide adsorption, the presence of more oxygen groups on the water vapor-activated carbon enhanced its adsorption capacity.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The aim of the present work is to study the effect of different activation methods for the production of a biomass-based activated carbon on the CO2 and CH4 adsorption. The influence of the activation method on the adsorption uptake was studied using three activated carbons obtained by different activation methods (H3PO4 chemical activation and H2O and CO2 physical activation) of olive stones. Methane and carbon dioxide pure gas adsorption experiments were carried out at two working temperatures (303.15 and 323.15 K). The influence of the activation method on the adsorption uptake was studied in terms of both textural properties and surface chemistry. For the three adsorbents, the CO2 adsorption was more important than that of CH4. The chemically-activated carbon presented a higher specific surface area and micropore volume, which led to a higher adsorption capacity of both CO2 and CH4. For methane adsorption, the presence of mesopores facilitated the diffusion of the gas molecules into the micropores. In the case of carbon dioxide adsorption, the presence of more oxygen groups on the water vapor-activated carbon enhanced its adsorption capacity. |
Yang, Jing; Pieuchot, Laurent; Jedd, Gregory Artificial import substrates reveal an omnivorous peroxisomal importomer (Article de journal) Traffic, 19 (10), p. 786–797, 2018. @article{Yang2018, title = {Artificial import substrates reveal an omnivorous peroxisomal importomer}, author = { Jing Yang and Laurent Pieuchot and Gregory Jedd}, doi = {10.1111/tra.12607}, year = {2018}, date = {2018-10-01}, journal = {Traffic}, volume = {19}, number = {10}, pages = {786--797}, abstract = {The peroxisome matrix protein importomer has the remarkable ability to transport oligomeric protein substrates across the bilayer. However, the selectivity and relation between import and overall peroxisome homeostasis remain unclear. Here, we microinject artificial import substrates and employ quantitative microscopy to probe limits and capabilities of the importomer. DNA and polysaccharides are piggyback imported when noncovalently bound by a peroxisome targeting signal (PTS)-bearing protein. A dimerization domain that can be tuned to systematically vary the binding dissociation constant (K-d) shows that a K-d in the millimolar range is sufficient to promote piggyback import. Microinjection of import substrate at high levels results in peroxisome growth and a proportional accumulation of peroxisome membrane proteins (PMPs). However, corresponding PMP mRNAs do not accumulate, suggesting that this response is posttranscriptionally regulated. Together, our data show that the importomer can tolerate diverse macromolecular species. Coupling between matrix import and membrane biogenesis suggests that matrix protein expression levels can be sufficient to regulate peroxisome size.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The peroxisome matrix protein importomer has the remarkable ability to transport oligomeric protein substrates across the bilayer. However, the selectivity and relation between import and overall peroxisome homeostasis remain unclear. Here, we microinject artificial import substrates and employ quantitative microscopy to probe limits and capabilities of the importomer. DNA and polysaccharides are piggyback imported when noncovalently bound by a peroxisome targeting signal (PTS)-bearing protein. A dimerization domain that can be tuned to systematically vary the binding dissociation constant (K-d) shows that a K-d in the millimolar range is sufficient to promote piggyback import. Microinjection of import substrate at high levels results in peroxisome growth and a proportional accumulation of peroxisome membrane proteins (PMPs). However, corresponding PMP mRNAs do not accumulate, suggesting that this response is posttranscriptionally regulated. Together, our data show that the importomer can tolerate diverse macromolecular species. Coupling between matrix import and membrane biogenesis suggests that matrix protein expression levels can be sufficient to regulate peroxisome size. |
Bernard, C A; Bahlouli, N; Wagner-Kocher, C; Lin, J; Ahzi, S; Remond, Y Multiscale description and prediction of the thermomechanical behavior of multilayered plasticized PVC under a wide range of strain rate (Article de journal) Journal of Materials Science, 53 (20), p. 14834–14849, 2018. @article{Bernard2018, title = {Multiscale description and prediction of the thermomechanical behavior of multilayered plasticized PVC under a wide range of strain rate}, author = { C. A. Bernard and N. Bahlouli and C. Wagner-Kocher and J. Lin and S. Ahzi and Y. Remond}, doi = {10.1007/s10853-018-2625-5}, year = {2018}, date = {2018-10-01}, journal = {Journal of Materials Science}, volume = {53}, number = {20}, pages = {14834--14849}, abstract = {Plasticization of polymers largely contributed to their worldwide utilization, especially for automotive crashworthiness, by making them a more ductile material. For such applications, a clear understanding of the mechanical properties evolution over a large range of strain rate and temperature is needed. In this study, we investigate a plasticized poly(vinyl chloride) manufactured through a multilayered process for the automotive industry. Analysis of the microstructure before and after mechanical testing, at different temperature and strain rate, highlighted the presence of sodium aluminosilicate within material microstructure. After thermal degradation analysis, these particles seem to be the only one to remain at high temperature. Moreover, it is important to mention that for the possible applications of this material, the temperature range is around the glass transition region leading. Thus, careful attention should be focused on the evolution of the material properties and on the way to model them. Numerical prediction of the storage modulus and yield stress using homemade models show a good agreement with the experimental data. More, these models will make reliable the use of these materials over a wide range of temperatures and strain rates that are difficult to obtain by experience, such as intermediate strain rates between quasi-static and dynamic loading.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Plasticization of polymers largely contributed to their worldwide utilization, especially for automotive crashworthiness, by making them a more ductile material. For such applications, a clear understanding of the mechanical properties evolution over a large range of strain rate and temperature is needed. In this study, we investigate a plasticized poly(vinyl chloride) manufactured through a multilayered process for the automotive industry. Analysis of the microstructure before and after mechanical testing, at different temperature and strain rate, highlighted the presence of sodium aluminosilicate within material microstructure. After thermal degradation analysis, these particles seem to be the only one to remain at high temperature. Moreover, it is important to mention that for the possible applications of this material, the temperature range is around the glass transition region leading. Thus, careful attention should be focused on the evolution of the material properties and on the way to model them. Numerical prediction of the storage modulus and yield stress using homemade models show a good agreement with the experimental data. More, these models will make reliable the use of these materials over a wide range of temperatures and strain rates that are difficult to obtain by experience, such as intermediate strain rates between quasi-static and dynamic loading. |
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