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Start Over Author "French Région Ile de France - SESAME" Topic 0210 nano-technology
3 results on '"French Région Ile de France - SESAME"'

1. Investigation of polymer-derived Si–(B)–C–N ceramic/reduced graphene oxide composite systems as active catalysts towards the hydrogen evolution reaction

Author

Jonathan Barés, Quentin Hanniet, Moustapha Boussmen, Emerson Coy, Vincent Huon, Igor Iatsunskyi, Damien Voiry, Chrystelle Salameh, Christel Gervais, Mikhael Bechelany, Philippe Miele, Institut Européen des membranes (IEM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Expérimentation & Calcul Scientifique (COMPEX), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), ThermoMécanique des Matériaux (ThM2), Adam Mickiewicz University in Poznań (UAM), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (LCMCP-SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), CNRS Cellule Energie exploratory project 'CeraMicroPac' and Axe Transverse Membranes du Futur project 'CeraMesoMem', CanBioSe (Grant No. 778157) and the National Science Center of Poland (UMO-2019/35 /B/ST5/00248), The French Région Ile de France—SESAME program for support for the NMR measurements (700 MHz NMR spectrometer), Doctoral School 'Ecole doctorale des Sciences Chimiques Balard, ED 459', European Project: 804320 ,2D-4-CO2, and Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)

Subjects
Ceramics, Materials science, Hydrogen Evolution Reaction, Science, Oxide, 02 engineering and technology, Overpotential, 010402 general chemistry, Platinum nanoparticles, 01 natural sciences, 7. Clean energy, Article, Catalysis, law.invention, chemistry.chemical_compound, law, Ceramic, renewable energy sources, Composites, Hydrogen production, Tafel equation, Multidisciplinary, Graphene, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Chemical engineering, visual_art, visual_art.visual_art_medium, Medicine, 0210 nano-technology, Inorganic chemistry, energy
Abstract

Hydrogen Evolution Reaction (HER) is an attractive technology for chemical conversion of energy. Replacement of platinum with inexpensive and stable electrocatalysts remains a major bottleneck hampering large-scale hydrogen production by using clean and renewable energy sources. Here, we report electrocatalytically active and ultra-stable Polymer-Derived Ceramics towards HER. We successfully prepared ultrathin silicon and carbon (Si–C) based ceramic systems supported on electrically conducting 2D reduced graphene oxide (rGO) nanosheets with promising HER activity by varying the nature and the composition of the ceramic with the inclusion of nitrogen, boron and oxygen. Our results suggest that oxygen-enriched Si-B-C-N/rGO composites (O-SiBCN/rGO) display the strongest catalytic activity leading to an onset potential and a Tafel slope of − 340 mV and ~ 120 mV dec−1 respectively. O-SiBCN/rGO electrodes display stability over 170 h with minimal increase of 14% of the overpotential compared to ~ 1700% for commercial platinum nanoparticles. Our study provides new insights on the performance of ceramics as affordable and robust HER catalysts calling for further exploration of the electrocatalytic activity of such unconventional materials.

Published
2020
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2. A soft-chemistry approach to the synthesis of amorphous calcium ortho/pyrophosphate biomaterials of tunable composition

Author

Christian Rey, Christian Bonhomme, Danielle Laurencin, Julien Trébosc, Mark E. Smith, Guillaume Laurent, Laëtitia Mayen, Olivier Marsan, Christèle Combes, Kuizhi Chen, Zhehong Gan, Jérémy Soulié, C. Coelho, Christel Gervais, Nicholai Daugaard Jensen, Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (LCMCP-SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Department of Chemistry [Lancaster], Lancaster University, Institut des matériaux de Paris-Centre (IMPC), Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, National High Magnetic Field Laboratory (NHMFL), Florida State University [Tallahassee] (FSU), EPSRC and BBSRC (contract reference PR140003), Birmingham Science City Advanced Materials Project 1 and 2, supported by Advantage West Midlands (AWM) and the European Regional Development Fund (ERDF), National Science Foundation Cooperative Agreement No. DMR-1157490 & DMR-1644779, and the State of Florida, French Région Ile de France - SESAME, ANR-16-CE19-0013,PyVerres,Développement de nouveaux verres à base de pyrophosphates élaborés par chimie douce pour des applications en régénération osseuse(2016), Centre National de la Recherche Scientifique - CNRS (FRANCE), Collège de France (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Florida State University - FSU (USA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Sorbonne Université (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Ecole Centrale de Lille (FRANCE), Lancaster University (UNITED KINGDOM), Université d'Artois (FRANCE), Université de Lille (FRANCE), Université de Montpellier (FRANCE), Unité de Catalyse et de Chimie du Solide - UCCS (Villeneuve d'Ascq, France), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Magnetic Resonance Spectroscopy, Sodium, Matériaux, 0206 medical engineering, Biomedical Engineering, Ionic bonding, chemistry.chemical_element, Biocompatible Materials, Context (language use), 02 engineering and technology, Calcium Pyrophosphate, Spectrum Analysis, Raman, Biochemistry, Pyrophosphate, Article, Soft chemistry, Biomaterials, chemistry.chemical_compound, Amorphous materials, X-Ray Diffraction, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Molecular Biology, Temperature, Phosphorus, General Medicine, Chemistry, Inorganic, 021001 nanoscience & nanotechnology, Phosphate, 020601 biomedical engineering, Amorphous solid, Characterization (materials science), Chemical engineering, chemistry, Thermogravimetry, Mixed calcium ortho/pyrophosphate, 0210 nano-technology, Biotechnology
Abstract

The development of amorphous phosphate-based materials is of major interest in the field of biomaterials science, and especially for bone substitution applications. In this context, we herein report the synthesis of gel-derived hydrated amorphous calcium/sodium ortho/pyrophosphate materials at ambient temperature and in water. For the first time, such materials have been obtained in a large range of tunable orthophosphate/pyrophosphate molar ratios. Multi-scale characterization was carried out thanks to various techniques, including advanced multinuclear solid state NMR. It allowed the quantification of each ionic/molecular species leading to a general formula for these materials: [(Ca2+y Na+z H+3+x-2y-z)(PO43−)1-x(P2O74−)x](H2O)u. Beyond this formula, the analyses suggest that these amorphous solids are formed by the aggregation of colloids and that surface water and sodium could play a role in the cohesion of the whole material. Although the full comprehension of mechanisms of formation and structure is still to be investigated in detail, the straightforward synthesis of these new amorphous materials opens up many perspectives in the field of materials for bone substitution and regeneration. Statement of significance The metastability of amorphous phosphate-based materials with various chain length often improves their (bio)chemical reactivity. However, the control of the ratio of the different phosphate entities has not been yet described especially for small ions (pyrophosphate/orthophosphate) and using soft chemistry, whereas it opens the way for the tuning of enzyme- and/or pH-driven degradation and biological properties. Our study focuses on elaboration of amorphous gel-derived hydrated calcium/sodium ortho/pyrophosphate solids at 70 °C with a large range of orthophosphate/pyrophosphate ratios. Multi-scale characterization was carried out using various techniques such as advanced multinuclear SSNMR (31P, 23Na, 1H, 43Ca). Analyses suggest that these solids are formed by colloids aggregation and that the location of mobile water and sodium could play a role in the material cohesion.

Published
2020
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3. Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization

Author

Eddy Petit, Damien Voiry, Cristina Coelho Diogo, Lucie Ries, Philippe Miele, Mikhael Bechelany, Sebastien Balme, Nicolas Onofrio, Chrystelle Salameh, Christel Gervais, Thierry Michel, Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut des matériaux de Paris-Centre (IMPC), Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (LCMCP-SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Peoples R China, and French Région Ile de France – SESAME

Subjects
Materials science, NANOFILTRATION, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, REACTIVE FORCE-FIELD, chemistry.chemical_compound, PERMEATION, law, WATER, [CHIM]Chemical Sciences, General Materials Science, REAXFF, Molybdenum disulfide, STABILITY, Graphene, Mechanical Engineering, IONIC TRANSPORT, General Chemistry, Permeation, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Membrane, chemistry, Chemical engineering, Mechanics of Materials, Covalent bond, SIMULATION, SEPARATION, GRAPHENE OXIDE, Nanofiltration, 0210 nano-technology, Selectivity, Methyl group
Abstract

International audience; Nanolaminate membranes made of two-dimensional materials such as graphene oxide are promising candidates for molecular sieving via size-limited diffusion in the two-dimensional capillaries, but high hydrophilicity makes these membranes unstable in water. Here, we report a nanolaminate membrane based on covalently functionalized molybdenum disulfide (MoS2) nanosheets. The functionalized MoS2 membranes demonstrate >90% and similar to 87% rejection for micropollutants and NaCl, respectively, when operating under reverse osmotic conditions. The sieving performance and water flux of the functionalized MoS2 membranes are attributed both to control of the capillary widths of the nanolaminates and to control of the surface chemistry of the nanosheets. We identify small hydrophobic functional groups, such as the methyl group, as the most promising for water purification. Methyl- functionalized nanosheets show high water permeation rates as confirmed by our molecular dynamic simulations, while maintaining high NaCl rejection. Control of the surface chemistry and the interlayer spacing therefore offers opportunities to tune the selectivity of the membranes while enhancing their stability

Published
2019
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