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51 results on '"Sébastien Clément"'

1. Raman resonance tuning of quaterthiophene in filled carbon nanotubes at high pressures

Author

Rafael S. Alencar, Bruno Jousselme, Romain Chambard, R. Aznar, Laurent Alvarez, J.-L. Bantignies, A. G. Souza Filho, Denis Machon, C. Weigel, A. L. Aguiar, R.S. Ferreira, Alfonso San-Miguel, Sébastien Clément, Laboratoire Charles Coulomb (L2C), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Quaterthiophene, Nanotube, Materials science, Resonance Raman spectroscopy, Carbon nanotubes, 02 engineering and technology, Carbon nanotube, Electronic structure, 010402 general chemistry, 01 natural sciences, law.invention, [SPI]Engineering Sciences [physics], symbols.namesake, law, [CHIM]Chemical Sciences, General Materials Science, Straintronics, [PHYS]Physics [physics], Intermolecular force, Resonance, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, High pressure, Chemical physics, symbols, Density functional theory, 0210 nano-technology, Raman spectroscopy
Abstract

Filling carbon nanotubes with molecules is a route for the development of electronically modified one-dimensional hybrid structures for which the interplay between the electronic structure of molecules and nanotubes is a key factor. Tuning these energy levels with external parameters is an interesting strategy for the engineering of new devices and materials. Here we show that the hybrid system composed by quaterthiophene (4T) molecules confined in single-walled carbon nanotubes, presents a piezo-Raman-resonance of the molecule vibrational pattern. This behavior manifests as a rapid pressure induced enhancement of the 4T Raman mode intensities compared to the tubes G-band Raman modes. Density functional theory calculations allow to explain the spectral behaviour through the pressure-enhanced quaterthiophene resonance evolution. By increasing pressure, the tube cross-section deformation leads to a reduction of the intermolecular distance, to the splitting of the molecular levels and then to an increase of resonance channels. Calculations and experiments converge to the 4T piezo-resonance scenario associated with the pressure-induced nanotube radial collapse observed at about 0.8 GPa. Our findings offer possibilities for the development of pressure transducers based on molecule-filled carbon nanotubes.

Published
2021
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2. Detection of the Enzymatic Cleavage of DNA through Supramolecular Chiral Induction to a Cationic Polythiophene

Author

David Beljonne, Sébastien Richeter, Mathieu Surin, Mathieu Fossépré, Marie Trevisan, Valentine Cyriaque, Ruddy Wattiez, Sébastien Clément, Laboratory for Chemistry of Novel Materials, Université de Mons (UMons), Proteomics and Microbiology Laboratory, 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), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), and Univ Mons, Belgique, Serv Chim Mat Nouveaux

Subjects
Circular dichroism, Molecular model, Biomedical Engineering, Supramolecular chemistry, macromolecular substances, 02 engineering and technology, 010402 general chemistry, Cleavage (embryo), 01 natural sciences, Biomaterials, chemistry.chemical_compound, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, Chemistry, Biochemistry (medical), technology, industry, and agriculture, Cationic polymerization, General Chemistry, Polymer, 021001 nanoscience & nanotechnology, Combinatorial chemistry, 0104 chemical sciences, [CHIM.POLY]Chemical Sciences/Polymers, Polythiophene, 0210 nano-technology, Biosensor
Abstract

Water-soluble π-conjugated polymers are increasingly envisioned in biosensors, in which their unique optical and electronic properties permit a highly sensitive detection of biomolecular targets. In particular, cationic π-conjugated polymers are attractive for DNA sensing technologies, through the use of the fluorescence signals either in physiological solutions or in thin films. However, in the context of enzymatic activity assays, fluorescence-based methods require covalently labeling DNA with a dye or an antibody and are limited to short time scale due to dye photobleaching. In this frame, we report here a novel possible approach to probe the cleavage of DNA by a restriction enzyme, in continuous and without covalently labeled DNA substrate. This is achieved by exploiting unique chiroptical signals arising from the chiral induction of DNA to a poly[3-(6'-(trimethylphosphonium)hexyl)thiophene-2,5-diyl] upon interaction. The cleavage of DNA by

Published
2019
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3. Synthesis, characterization and use of a POSS-arylamine based push–pull octamer

Author

Clément Cabanetos, Sébastien Richeter, Sylvie Dabos-Seignon, Amir Hossein Habibi, Sébastien Clément, Pablo Simón Marqués, Ahmad Mehdi, José María Andrés Castán, Philippe Blanchard, 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), MOLTECH-Anjou, and Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
chemistry.chemical_classification, Organic solar cell, [CHIM.ORGA]Chemical Sciences/Organic chemistry, 02 engineering and technology, General Chemistry, Polymer, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Small molecule, Catalysis, Silsesquioxane, Polymer solar cell, 0104 chemical sciences, Characterization (materials science), chemistry.chemical_compound, chemistry, Chemical engineering, Materials Chemistry, Histone octamer, 0210 nano-technology, Push pull
Abstract

International audience; The first synthesis of an original octamer consisting of a central polyhedral oligomeric silsesquioxane (POSS) cage decorated with electro- and optically active arylamine-based push–pull building-blocks is reported herein. Once fully characterized, the potential of the new compound was evaluated as donor material in bulk heterojunction organic solar cells. With promising power conversion efficiencies, good processability and film forming properties, such multimer architectures turns out to be potential candidates to bridge the gap between small molecules and polymers.

Published
2021
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4. Phosphonium-based polythiophene conjugated polyelectrolytes with different surfactant counterions: thermal properties, self-assembly and photovoltaic performances

Author

Sylvain Chambon, M. Chevrier, Roberto Lazzaroni, Niko Van den Brande, Sébastien Clément, Rachel C. Evans, Bruno Van Mele, Jurgen Kesters, Philippe Dubois, Thomas Arnold, Ahmad Mehdi, Wouter Maes, Sébastien Richeter, Judith E. Houston, Materials and Chemistry, Vriendenkring VUB, Physical Chemistry and Polymer Science, Biology, Faculty of Economic and Social Sciences and Solvay Business School, Kesters, J [0000-0003-2095-8411], Houston, JE [0000-0001-5205-3620], Van den Brande, N [0000-0002-5324-6261], Chambon, S [0000-0003-0703-7407], Richeter, S [0000-0001-5284-0931], Mehdi, A [0000-0002-7830-2012], Lazzaroni, R [0000-0002-6334-4068], Dubois, P [0000-0003-1534-1564], Evans, RC [0000-0003-2956-4857], Maes, W [0000-0001-7883-3393], Clément, S [0000-0002-8473-8197], Apollo - University of Cambridge Repository, 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), Centre d'Innovation et de Recherche en Matériaux Polymères (CIRMAP), Université de Mons (UMons), Hasselt University (UHasselt), Jülich Centre for Neutron Science (JCNS), Physical Chemistry and Polymer Science (FYSC), Vrije Universiteit Brussel (VUB), Laboratoire de l'intégration, du matériau au système (IMS), Université Sciences et Technologies - Bordeaux 1-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Diamond Light Source Limited [Didcot, UK], Harwell Science and Innovation Campus [Didcot, UK], European Spallat Source ERIC, POB 176, SE-22100 Lund, Sweden, Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, Rutherford Appleton Lab, ISIS Neutron & Muon Source, Didcot OX11 0QX, Oxon, England, Department of Materials Science and Metallurgy [Cambridge University] (DMSM), University of Cambridge [UK] (CAM), MEHDI, Ahmad/0000-0002-7830-2012, Houston, Judith/0000-0001-5205-3620, Arnold, Thomas/0000-0001-8295-3822, Van den Brande, Niko/0000-0002-5324-6261, and Chambon, Sylvain/0000-0003-0703-7407

Subjects
Materials science, Polymers and Plastics, Organic solar cell, conjugated polyelectrolytes, 02 engineering and technology, 010402 general chemistry, 7. Clean energy, 01 natural sciences, Polymer solar cell, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, Photoactive layer, Materials Chemistry, Phosphonium, chemistry.chemical_classification, surfactant counteranion, Organic Chemistry, organic solar cells, self-assembly, 021001 nanoscience & nanotechnology, Conjugated Polyelectrolytes, 0104 chemical sciences, chemistry, Chemical engineering, thin films, cathode interlayers, Polythiophene, Counterion, 0210 nano-technology, Glass transition
Abstract

Phosphonium-based polythiophene conjugated polyelectrolytes (CPEs) with three different counterions (dodecylsulfate, octylsulfate and perfluorooctane sulfonate) are synthesized to determine how the nature of the counterion affects the thermal properties, the self-assembly in thin films and the performance as the cathode interfacial layer in polymer solar cells (PSCs). The counterion has a significant effect on the thermal properties of the CPEs, affecting both their glass transition and crystalline behaviour. Grazing-incidence wide-angle X-ray scattering studies also indicate that changing the nature of the counterion influences the microstructural organization in thin films (face-onversusedge-on orientation). The affinity of the CPEs with the underlying photoactive layer in PSCs is highly correlated with the counterion species. Finally, in addition to an increase of the power conversion efficiency ofca15% when using these CPEs as cathode interfacial layers in PSCs, a higher device stability is noted, compared to a reference device with a calcium interlayer. (c) 2020 Society of Industrial Chemistry This work was supported by the CNRS and the Universite de Montpellier. This work was also supported in part by the Science Foundation Ireland under grant no. 12/IP/1608. Research in Mons is supported by FNRS-FRFC (2Dto3D project - EOS programme) and Region Wallonne (OPTI2MAT excellence programme). The University of Mons and Hasselt University co-authors are grateful for financial support by the Science Policy Office of the Belgian Federal Government (BELSPO; PAI/IAP 7/05). JK is a postdoctoral fellow of the Research Foundation - Flanders (FWO Vlaanderen). NVdB thanks the Vrije Universiteit Brussel for a post-doctoral grant. The HINT COST action MP1202 and French-Irish programme 'Hubert Curien Ulysses' (31998ZF) are also acknowledged for support. This research has also been supported by the European Commission under the 7th Framework Programme through the 'Research Infrastructures' action of the 'Capacities' programme (contract no. CP-CSA_INFRA-2008-1.1.1 Number 226507-NM13). We further thank the Diamond Light Source for beamtime at the I07 beamline (experiment SI13868) and TA Instruments for the RHC equipment. Clement, S (corresponding author), Univ Montpellier, ENSCM, CNRS, ICGM, Montpellier, France. sebastien.clement1@umontpellier.fr

Published
2021
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5. Lattice Dynamics Study of Elemental Bismuth under High Pressure

Author

Romain Viennois, Sébastien Clément, Julien Haines, Yixuan Zhao, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and 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)

Subjects
Lattice dynamics, Materials science, High Energy Physics::Lattice, Thermodynamics, chemistry.chemical_element, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, Pressure dependence, 021001 nanoscience & nanotechnology, 01 natural sciences, 3. Good health, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Bismuth, General Energy, chemistry, High pressure, 0103 physical sciences, Physical and Theoretical Chemistry, 010306 general physics, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

We report a combined experimental and theoretical study of the lattice dynamics of different high-pressure phases of bismuth and their pressure dependence. The stability and the lattice dynamics of...

Published
2020
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6. Sol-Gel Chemistry: From Molecule to Functional Materials

Author

Ahmad Mehdi, Sébastien Clément, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and 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)

Subjects
Pharmaceutical Science, Biocompatible Materials, coatings, 02 engineering and technology, 01 natural sciences, Analytical Chemistry, Biofouling, chemistry.chemical_compound, Materials Testing, Drug Discovery, Nanotechnology, anticorrosion, Optical Fibers, ComputingMilieux_MISCELLANEOUS, dye-sensitized solar cells (DSSCs), antifouling, Temperature, [CHIM.MATE]Chemical Sciences/Material chemistry, self-assembly, Hydrogen-Ion Concentration, Silicon Dioxide, 021001 nanoscience & nanotechnology, Anti-Bacterial Agents, Corrosion, Chemistry, Editorial, Chemistry (miscellaneous), Scientific method, Molecular Medicine, 0210 nano-technology, hydrolytic, Materials science, Surface Properties, Phase Transition, Catalysis, non-hydrolytic, lcsh:QD241-441, lcsh:Organic chemistry, Escherichia coli, Molecule, sol-gel, Physical and Theoretical Chemistry, Sol-gel, catalysis, 010405 organic chemistry, titanium dioxide, Organic Chemistry, PAHs adsorption, 0104 chemical sciences, Kinetics, Chemical engineering, Polymerization, chemistry, Titanium dioxide, Biocatalysis, Self-assembly, Reactive Oxygen Species, Hydrogen
Abstract

Through this Special Issue, you will discover the potentiality of inorganic polymerization (sol-gel process) which is a unique and versatile way for the preparation of materials [...]

Published
2020
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7. High-pressure, high temperature synthesis of a mesoporous α-quartz/bismuth nanowire composite

Author

M. Cambon, Pierre Toulemonde, Romain Viennois, Gaël Talbi, Thomas Hansen, Mickael Beaudhuin, Olivier Cambon, Yixuan Zhao, Sébastien Clément, Julien Haines, 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), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Matériaux, Rayonnements, Structure (MRS), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), and ILL

Subjects
Materials science, Guest Insertion, Composite number, Nanowire, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Bismuth, Nanocomposites, Silica nanotubes, General Materials Science, Quartz, Nanocomposite, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Amorphous solid, chemistry, Chemical engineering, Transmission electron microscopy, 0210 nano-technology, Mesoporous material, High Pressure
Abstract

International audience; High temperature, high pressure conditions were used to insert liquid bismuth in 4-6 nm diameter amorphous silica nanotubes. A combination of transmission electron microscopy and neutron powder diffrac-tion indicate that the final composite consists in 5-6 nm semi-conducting Bi nanowires confined in insulating mesoporous -quartz. Such a nanostructured material could be of considerable interest for thermo-electric applications. HIGHLIGHTS:  Bismuth was inserted into 4-6 nm silica nanotubes under high-pressure, high-temperature conditions  The host amorphous nanotubes crystallize in the form of -quartz  The obtained nanocomposite consists of 5-6 nm Bi nanowires imbedded in mesoporous -quartz  The formation of Bi nanowires modifies their physical properties compared to bulk Bi

Published
2020
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8. Conductive multilayer film based on composite materials made of conjugated polyelectrolytes and inorganic particles

Author

Boris Lakard, C.C. Buron, Sébastien Clément, C. Filiâtre, Ahmad Mehdi, F.E. Jurin, Nicolas Martin, Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), 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), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), 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), and Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC)

Subjects
Materials science, Inorganic colloidal particle, Composite film, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Polystyrene sulfonate, chemistry.chemical_compound, Colloid and Surface Chemistry, PEDOT:PSS, Multilayer, Zeta potential, [CHIM]Chemical Sciences, Surface charge, Composite material, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Conductivity, Conjugated polyelectrolyte, 021001 nanoscience & nanotechnology, Conjugated Polyelectrolytes, Polythiophene, Polyelectrolyte, 0104 chemical sciences, chemistry, Particle, 0210 nano-technology
Abstract

International audience; Poly(3,4-ethylenedioxythiophene)–polystyrene sulfonate (PEDOT:PSS) conjugated polymer blend and a cationic poly(3-hexylthiophene) (P3HT)-based conjugated polyelectrolyte incorporating imidazolium ionic side groups were first adsorbed as monolayer on inorganic colloidal particles. At the plateau of adsorption isotherm, adsorbed amount of PEDOT:PSS on alumina particles appears lower than the adsorbed amount of P3HT on silica particles. Both polyelectrolytes strongly modify the surface charge of particles as reveals by zeta potential variation. Functionalized particles were then assembled using Layer-by-Layer method in order to prepare (PDDA/Al2O3-PEDOT:PSS)n and (SiO2-P3HT/PEDOT:PSS)n conductive multilayer film. Thicker PDDA/Al2O3-PEDOT:PSS films were elaborated when a drying step was added during the LbL build-up. The same effect was observed when composite particle concentration was increased from 1 to 10 g.L−1. Electrical behavior of film was completely modified in comparison with PDDA/PEDOT:PSS assembly. After heating at 150 °C, no conductivity was detected due to microcracks visible on SEM images. For SiO2-P3HT/PEDOT:PSS assembly, thickness is higher than for PDDA/Al2O3-PEDOT:PSS assembly using the same experimental procedure. However, even if two conductive polyelectrolytes were embedded into the film, conductivity was too low at 30 °C to be measured by van der Pauw technique probably due to the cracking of the film induced by incorporation of silica particles.

Published
2020
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9. Diazachlorin and diazabacteriochlorin for one- and two-photon photodynamic therapy

Author

Morgane Daurat, Jean-François Longevial, Tsubasa Nishimura, Dongho Kim, Juwon Oh, Sébastien Richeter, Wen Xi Chia, Ayaka Yamaji, Yoshihiro Miyake, Magali Gary-Bobo, Christophe Nguyen, Gakhyun Kim, Dina Aggad, Hiroshi Shinokubo, Sébastien Clément, 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), Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), 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), and Soongsil University

Subjects
Models, Molecular, medicine.medical_treatment, education, Breast Neoplasms, Photodynamic therapy, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Catalysis, Two-photon excitation microscopy, In vivo, Cell Line, Tumor, Materials Chemistry, medicine, Animals, Humans, Zebrafish, health care economics and organizations, Photons, Photosensitizing Agents, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Chemistry, Metals and Alloys, General Chemistry, 021001 nanoscience & nanotechnology, In vitro, 3. Good health, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Photochemotherapy, MCF-7 Cells, Ceramics and Composites, Cancer research, Female, 0210 nano-technology
Abstract

International audience; Diazachlorin and diazabacteriochlorin have been prepared through reduction of diazaporphyrin and their in vitro and in vivo activity in photodynamic therapy has been investigated.

Published
2018
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10. Molecular design of interfacial layers based on conjugated polythiophenes for polymer and hybrid solar cells

Author

Rachel C. Evans, Sébastien Richeter, Judith E. Houston, and Sébastien Clément

Subjects
chemistry.chemical_classification, Materials science, Polymers and Plastics, Organic Chemistry, Photovoltaic system, Nanotechnology, 02 engineering and technology, Polymer, Hybrid solar cell, Conjugated system, 010402 general chemistry, 021001 nanoscience & nanotechnology, 7. Clean energy, 01 natural sciences, Conjugated Polyelectrolytes, Polymer solar cell, 0104 chemical sciences, law.invention, chemistry.chemical_compound, chemistry, law, Solar cell, Materials Chemistry, Polythiophene, 0210 nano-technology
Abstract

In the past two decades, bulk heterojunction-organic photovoltaic devices (BHJ-OPVs) have emerged as attractive candidates for solar energy conversion due to their light-weight design and potential for low-cost high-throughput, solution-phase processability. Interfacial engineering is a proven efficient approach to achieve OPVs with high power conversion efficiencies (PCEs). This mini-review provides an overview of the key structural considerations necessary when undertaking the molecular design of conjugated polyelectrolytes (CPEs), for application as interfacial layers (ILs). The different roles of ILs are outlined, together with the advantages and disadvantages of competing classes of IL materials. Particular emphasis is placed on the design and synthesis of water-soluble polythiophene-based IL materials and the influence of their structural characteristics on their performance as a promising class of IL materials. Finally, the challenges and opportunities for polythiophenes as IL materials for OPVs and other solution-processed solar cell technologies (e.g. perovskite solar cells) are discussed.

Published
2017
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11. Synthesis, characterization and modeling of self-assembled porphyrin nanorods

Author

Christel Gervais, Danielle Laurencin, Didier Cot, Sébastien Richeter, Yannick Guari, Sébastien Clément, Matthieu Paillet, Pascal G. Yot, Erik Elkaim, 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), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Européen des membranes (IEM), 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
NMR crystallography, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, chemistry.chemical_compound, law, DFT modeling Tel : ++(33)467143971, Spectroscopy, solid state NMR, Tetraphenylborate, Chemistry, NMR cristallography, General Chemistry, self-assembly, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Porphyrin, Synchrotron, 0104 chemical sciences, Crystallography, Solid-state nuclear magnetic resonance, Nanorod, Self-assembly, 0210 nano-technology, nanorods, DFT modeling, porphyrin, Powder diffraction
Abstract

Porphyrin nanorods were prepared by ion-association between free-base meso 5,10,15,20-tetrakis-(4-[Formula: see text]-methylpyridinium)porphyrin cations and tetraphenylborate anions. The nanorods have variable lengths (up to a few micrometers long) and diameters ([Formula: see text]50–500 nm). Their structure at the molecular level was elucidated by combining multinuclear solid state NMR spectroscopy, synchrotron X-ray powder diffraction and DFT calculations.

Published
2019
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12. High-pressure, high temperature insertion of bismuth in the siliceous zeolite silicalite-1

Author

Romain Viennois, Thomas Hansen, Julien Haines, Patrick Hermet, Jérôme Rouquette, Bruno Alonso, Vasyl Veremeienko, P. Toulemonde, Yixuan Zhao, Arie van der Lee, Sébastien Clément, 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), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Matériaux, Rayonnements, Structure (MRS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Laue-Langevin (ILL), ILL, Institut Européen des membranes (IEM), 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
inorganic chemicals, Materials science, Band gap, Composite number, chemistry.chemical_element, 02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 01 natural sciences, Bismuth, symbols.namesake, Guest insertion, General Materials Science, Zeolite, business.industry, General Chemistry, Semiconductor, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, equipment and supplies, 0104 chemical sciences, Crystallography, High pressure, chemistry, Silicalite-1, Transmission electron microscopy, symbols, Density functional theory, van der Waals force, 0210 nano-technology, business
Abstract

International audience; A silicalite-1/bismuth composite was synthesized by insertion of liquid bismuth in the 5.5 Å diameter pores of the zeolite under high-pressure, high-temperature conditions. The insertion of bismuth stabilizes the structure with respect to pressure-induced amorphization. Transmission electron microscopy indicated the presence of chains of atoms, which correspond to the 5.5 Å diameter of the host silicalite-1 structure. Neutron powder diffraction also confirmed the insertion of Bi in the pores of silicalite-1. Density functional theory calculations indicate that the insertion of bismuth results in formation of chains with short and long Bi-Bi distances in the pores of the host silicalite-1 linked to the framework by van der Waal's interactions. The material is predicted to be a semiconductor with a band gap of 0.4 eV.

Published
2019
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13. Pressure-induced densification of vitreous silica: Insight from elastic properties

Author

Coralie Weigel, René Vacher, Marouane Mebarki, Sébastien Clément, Marie Foret, Benoit Ruffle, Laboratoire Charles Coulomb (L2C), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Condensed Matter - Materials Science, Range (particle radiation), Equation of state, Materials science, Coordination number, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Thermodynamics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Light scattering, Brillouin zone, Hysteresis, 0103 physical sciences, Dispersion (optics), [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Compressibility, 010306 general physics, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

\textit{In situ} high-pressure Brillouin light scattering experiments along loading-unloading paths are used to investigate the compressibility of vitreous silica. An accurate equation of state is obtained below \SI{9}{GPa} using sound velocities corrected for dispersion. Conversely, huge inelastic effects are observed in the range \SIrange{10}{60}{GPa}, unveiling the reversible transformation from the fourfold-coordinated structure to the sixfold one. We find that the associated density changes fully correlate with the average Si coordination number. Decompression curves from above \SI{20}{GPa} reveal abrupt backward coordination changes around \SIrange{10}{15}{GPa} and significant hysteresis. Further, contrary to common wisdom, the residual densification of recovered silica samples can be figured out from the pressure cycles., 5 pages, 4 figures, revised version

Published
2019
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14. A Cationic Tetraphenylethene as a Light-Up Supramolecular Probe for DNA G-Quadruplexes

Author

Sébastien Ulrich, Mathieu Fossépré, Clément Kotras, Philippe Gerbier, Sébastien Richeter, Mathieu Surin, Virginie Gervais, Sébastien Clément, Maxime Roger, Institut de pharmacologie et de biologie structurale (IPBS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratory for Chemistry of Novel Materials, University of Mons [Belgium] (UMONS), Université de Mons (UMons), Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés (LISBP), Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Recherche Agronomique (INRA), 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), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, and 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
Circular dichroism, Molecular model, Supramolecular chemistry, tetraphenylethene, 02 engineering and technology, 010402 general chemistry, G-quadruplex, 01 natural sciences, lcsh:Chemistry, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS, Original Research, Chemistry, Isothermal titration calorimetry, General Chemistry, 021001 nanoscience & nanotechnology, G-quadruplexes, Fluorescence, Small molecule, 0104 chemical sciences, Förster resonance energy transfer, lcsh:QD1-999, Biophysics, fluorescence, light-up probe, 0210 nano-technology, supramolecular
Abstract

International audience; Guanine-quadruplexes (G4s) are targets for anticancer therapeutics. In this context, human telomeric DNA (HT-DNA) that can fold into G4s sequences are of particular interest, and their stabilization with small molecules through a visualizable process has become a challenge. As a new type of ligand for HT-G4, we designed a tetraimidazolium tetraphenylethene (TPE-Im) as a water-soluble light-up G4 probe. We study its G4-binding properties with HT-DNA by UV-Visible absorption, circular dichroism and fluorescence spectroscopies, which provide insights into the interactions between TPE-Im and G4-DNA. Remarkably, TPE-Im shows a strong fluorescence enhancement and large shifts upon binding to G4, which is valuable for detecting G4s. The association constants for the TPE-Im/G4 complex were evaluated in different solution conditions via isothermal titration calorimetry (ITC), and its binding modes were explored by molecular modeling showing a groove-binding mechanism. The stabilization of G4 by TPE-Im has been assessed by Fluorescence Resonance Energy Transfer (FRET) melting assays, which show a strong stabilization (1T1/2 around +20◦C), together with a specificity toward G4 with respect to double-stranded DNA.

Published
2019
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15. Synthesis and properties of a P3HT-based ABA triblock copolymer containing a perfluoropolyether central segment

Author

Wojciech Zajaczkowski, Ruben Lenaerts, Gérald Lopez, Roberto Lazzaroni, Julien De Winter, Sébastien Clément, Mathieu Surin, Michèle Chevrier, Wojciech Pisula, Bruno Ameduri, Philippe Dubois, Jurgen Kesters, Sébastien Richeter, Wouter Maes, Ahmad Mehdi, Pascal Gerbaux, 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), Max-Planck-Institut, Hasselt University (UHasselt), Laboratory for Chemistry of Novel Materials, Université de Mons (UMons), Laboratoire de Chimie Organique, Université de Mons-Hainaut, Mass Spectrometry Research Group, and CIRMAP (CIRMAP)

Subjects
Materials science, Absorption spectroscopy, Size-exclusion chromatography, 02 engineering and technology, 010402 general chemistry, 7. Clean energy, 01 natural sciences, Materials Chemistry, Copolymer, [CHIM]Chemical Sciences, Thermal stability, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, Mechanical Engineering, Metals and Alloys, Polymer, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Crystallography, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Mechanics of Materials, Crystallite, Absorption (chemistry), 0210 nano-technology, Glass transition
Abstract

A poly(3-hexylthiophene)-block-perfluoropolyether-block-poly(3-hexylthiophene) (P3HT-b-PFPE-b-P3HT) triblock copolymer was synthesized by copper(I)-catalyzed alkyne–azide cycloaddition (CuAAC) in 95% yield. The copolymer was unequivocally characterized by size exclusion chromatography reaching 27 000 g mol−1 and nuclear magnetic resonance (NMR). As expected, diffusion-ordered spectroscopy NMR experiment revealed a lower diffusion coefficient (2.56 × 10-10 m2 s−1) for the P3HT-b-PFPE-b-P3HT triblock copolymer than the ethynyl end-functionalized P3HT (2.83 × 10-10 m2 s−1). Such a triblock copolymer exhibits i) a good thermal stability with no significant weight loss until 320 °C under air, ii) a glass transition of -50 °C due to the soft PFPE segment and iii) a melting peak arising from P3HT at 236 °C. The UV–vis absorption spectrum exhibits a similar absorption profile to that of pure P3HT with a vibronic structure. Analysis of terpolymer thin films by atomic force microscopy imaging and grazing incidence wide-angle X-ray scattering reveals the formation of P3HT crystallites and an “edge-on” orientation of the polymer chains towards the substrate. Preliminary photovoltaic studies on blends of this triblock copolymer combined with a fullerene derivative indicate that the devices using P3HT-b-PFPE-b-P3HT show an almost similar power conversion efficiency to commercial P3HT.

Published
2019
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16. Supramolecular Self‐Assembly of DNA with a Cationic Polythiophene: From Polyplexes to Fibers

Author

Sébastien Clément, Sylvain Gabriele, Laurent Leclercq, Mathieu Surin, Maxime Leclercq, Hervé Cottet, Sébastien Richeter, Jenifer Rubio-Magnieto, Danahe Mohammed, Laboratory for Chemistry of Novel Materials, Université de Mons (UMons), MateriaNova Research Center (MNRS), Université de Mons-Hainaut, Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), 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), University of Mons [Belgium] (UMONS), 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 de Montpellier (UM), and 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)

Subjects
chemistry.chemical_classification, Hydrodynamic radius, Renewable Energy, Sustainability and the Environment, Oligonucleotide, Biomolecule, [SDV]Life Sciences [q-bio], Supramolecular chemistry, Cationic polymerization, Energy Engineering and Power Technology, 02 engineering and technology, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Biomaterials, chemistry.chemical_compound, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Chemical engineering, Materials Chemistry, Polythiophene, Self-assembly, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; Cationic polythiophenes constitute an interesting class of polymers for prospective applications in imaging, gene delivery and biosensing, as they combine solubility in aqueous media and have sensitive optical properties for the detection of biomolecules such as DNA. Here, we study the supramolecular self-assembly of poly[3-(6'-(trimethylphosphonium)hexyl)thiophene-2,5-diyl] (P3HT-PMe3) with different types of DNA, such as single-stranded oligonucleotides or long genomic DNA. Self-assembly in buffered aqueous solution yields polyplexes (polymer/DNA complexes) with hydrodynamic radius ranging from 7 nm to around 25 nm, as observed by Taylor Dispersion Analysis. In these polyplexes, the achiral polymer presents chiroptical signals induced by supramolecular organization along chiral DNA. When the solution of long DNA/P3HT-PMe3 is deposited on surfaces, tens of µm-long fibers are formed by condensation of DNA and compaction of the polyplexes, as evidenced by microscopy techniques.

Published
2019
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17. High-Permittivity Conjugated Polyelectrolyte Interlayers for High-Performance Bulk Heterojunction Organic Solar Cells

Author

Xianjie Liu, Sanne Govaerts, Geert Pirotte, Dirk Vanderzande, Jeroen Drijkoningen, Bruno Van Mele, Mats Fahlman, Wouter Maes, Niko Van den Brande, Laurence Lutsen, Jurgen Kesters, Elizabeth von Hauff, Michèle Chevrier, Sébastien Clément, Jean Manca, Hasselt University (UHasselt), 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), Université de Mons (UMons), Physical Chemistry and Polymer Science (FYSC), Vrije Universiteit Brussel (VUB), Linköping University (LIU), IMEC (IMEC), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Vrije Universiteit Amsterdam [Amsterdam] (VU), LaserLaB - Energy, Photo Conversion Materials, Materials and Chemistry, Physical Chemistry and Polymer Science, and Faculty of Economic and Social Sciences and Solvay Business School

Subjects
Permittivity, dielectric permittivity, Materials science, Organic solar cell, conjugated polyelectrolytes, organic photovoltaics, cathode interlayers, impedance spectroscopy, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Polymer solar cell, chemistry.chemical_compound, Photoactive layer, Fysik, Organic chemistry, General Materials Science, SDG 7 - Affordable and Clean Energy, Double layer (biology), [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Conjugated Polyelectrolytes, 0104 chemical sciences, Dielectric spectroscopy, [CHIM.POLY]Chemical Sciences/Polymers, Chemical engineering, chemistry, Physical Sciences, Polythiophene, 0210 nano-technology
Abstract

Conjugated polyelectrolyte (CPE) interfacial layers present a powerful way to boost the I-V characteristics of organic photovoltaics. Nevertheless, clear guidelines with respect to the structure of high-performance interlayers are still lacking. In this work, impedance spectroscopy is applied to probe the dielectric permittivity of a series of polythiophene-based CPEs. The presence of ionic pendant groups grants the formation of a capacitive double layer, boosting the charge extraction and device efficiency. A counteracting effect is the diminishing affinity with the underlying photoactive layer. To balance these two effects, we found copolymer structures containing nonionic side chains to be beneficial. Funding Agencies|IAP project Functional Supramolecular Systems [7/05]; Science Policy Office of the Belgian Federal Government (BELSPO); Research Program of the Research Foundation Flanders (FWO) [G.0415.14N]; Foundation for Fundamental Research on Matter (FOM) from The Netherlands Organization for Scientific Research (NWO) [V0714M-13MV60]; Swedish Research Council Linnaeus LiLi-NFM at Linkoping University; Vrije Universiteit Brussel (VUB); University of Montpellier; CNRS; University of Mons

Published
2016
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18. Polythiophenes with Cationic Phosphonium Groups as Vectors for Imaging, siRNA Delivery, and Photodynamic Therapy

Author

Mathieu Surin, Jean-Olivier Durand, Philippe Arnoux, Christophe Nguyen, Morgane Daurat, Céline Frochot, Denis Durand, Karim Bouchmella, Bauyrzhan Myrzakhmetov, Sébastien Richeter, Clément Kotras, Magali Gary-Bobo, Laure Lichon, Lamiaa M. A. Ali, Sébastien Clément, Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), 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), Laboratoire Réactions et Génie des Procédés (LRGP), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), NanoMedSyn, Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), 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), Centre d'Innovation et de Recherche en Matériaux Polymères (CIRMAP), and Université de Mons (UMons)

Subjects
polythiophenes, siRNA delivery, General Chemical Engineering, medicine.medical_treatment, Photodynamic therapy, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Article, law.invention, lcsh:Chemistry, chemistry.chemical_compound, combined therapy, Confocal microscopy, law, Amphiphile, conjugated polyelectrolyte, medicine, [CHIM]Chemical Sciences, General Materials Science, Luciferase, chemistry.chemical_classification, Reactive oxygen species, Singlet oxygen, Cationic polymerization, imaging, 021001 nanoscience & nanotechnology, Fluorescence, 0104 chemical sciences, 3. Good health, lcsh:QD1-999, photodynamic therapy, chemistry, Biophysics, 0210 nano-technology
Abstract

In this work, we exploit the versatile function of cationic phosphonium-conjugated polythiophenes to develop multifunctional platforms for imaging and combined therapy (siRNA delivery and photodynamic therapy). The photophysical properties (absorption, emission and light-induced generation of singlet oxygen) of these cationic polythiophenes were found to be sensitive to molecular weight. Upon light irradiation, low molecular weight cationic polythiophenes were able to light-sensitize surrounding oxygen into reactive oxygen species (ROS) while the highest were not due to its aggregation in aqueous media. These polymers are also fluorescent, allowing one to visualize their intracellular location through confocal microscopy. The most promising polymers were then used as vectors for siRNA delivery. Due to their cationic and amphipathic features, these polymers were found to effectively self-assemble with siRNA targeting the luciferase gene and deliver it in MDA-MB-231 cancer cells expressing luciferase, leading to 30&ndash, 50% of the gene-silencing effect. In parallel, the photodynamic therapy (PDT) activity of these cationic polymers was restored after siRNA delivery, demonstrating their potential for combined PDT and gene therapy.

Published
2020
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19. In Depth Analysis of Photovoltaic Performance of Chlorophyll Derivative-Based 'All Solid-State' Dye-Sensitized Solar Cells

Author

Michela Cangiotti, Clémence Rose, Maria Francesca Ottaviani, Johann Bouclé, David Beljonne, Sébastien Richeter, Laurent Lasser, Alberto Fattori, Sébastien Clément, Ahmad Mehdi, Roberto Lazzaroni, Clément Kotras, Michèle Chevrier, Mathieu Surin, Philippe Dubois, University of Mons [Belgium] (UMONS), 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), Department of Earth, Life and Environment Sciences, University of Urbino (DiSTeVA), Università degli Studi di Urbino 'Carlo Bo', Université de Mons (UMons), Centre d'Innovation et de Recherche en Matériaux Polymères (CIRMAP), RF-ELITE : RF-Electronique Imprimée pour les Télécommunications et l'Energie (XLIM-RFEI), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Météorologie Physique - Clermont Auvergne (LaMP), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Chlorophyll, Materials science, Pharmaceutical Science, 02 engineering and technology, 010402 general chemistry, Photochemistry, EPR, anchoring groups, chlorophyll, solid state dye sensitized solar cells, spirulina, 7. Clean energy, 01 natural sciences, Article, Analytical Chemistry, law.invention, lcsh:QD241-441, Spin probe, Adsorption, lcsh:Organic chemistry, law, Drug Discovery, Solar Energy, Molecular orbital, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Physical and Theoretical Chemistry, Electron paramagnetic resonance, ComputingMilieux_MISCELLANEOUS, Titanium, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Organic Chemistry, Photovoltaic system, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Dye-sensitized solar cell, Chemistry (miscellaneous), [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Molecular Medicine, Density functional theory, 0210 nano-technology, Mesoporous material, Porosity
Abstract

Chlorophyll a derivatives were integrated in &ldquo, all solid-state&rdquo, dye sensitized solar cells (DSSCs) with a mesoporous TiO2 electrode and 2&prime, 2&prime, 7,7&prime, tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9&prime, spirobifluorene as the hole-transport material. Despite modest power conversion efficiencies (PCEs) between 0.26% and 0.55% achieved for these chlorin dyes, a systematic investigation was carried out in order to elucidate their main limitations. To provide a comprehensive understanding of the parameters (structure, nature of the anchoring group, adsorption &hellip, ) and their relationship with the PCEs, density functional theory (DFT) calculations, optical and photovoltaic studies and electron paramagnetic resonance analysis exploiting the 4-carboxy-TEMPO spin probe were combined. The recombination kinetics, the frontier molecular orbitals of these DSSCs and the adsorption efficiency onto the TiO2 surface were found to be the key parameters that govern their photovoltaic response.

Published
2020
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20. New Layered Polythiophene-Silica Composite Through the Self-Assembly and Polymerization of Thiophene-Based Silylated Molecular Precursors

Author

Danielle Laurencin, Marie-José Zacca, Sébastien Clément, Ahmad Mehdi, Sébastien Richeter, University of Balamand - UOB (LIBAN), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and 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)

Subjects
Materials science, Polymers, Pharmaceutical Science, 02 engineering and technology, Thiophenes, 010402 general chemistry, 01 natural sciences, Article, Analytical Chemistry, Polymerization, lcsh:QD241-441, chemistry.chemical_compound, lcsh:Organic chemistry, Drug Discovery, Thiophene, sol-gel, Lamellar structure, Physical and Theoretical Chemistry, Bifunctional, Sol-gel, chemistry.chemical_classification, Organic Chemistry, hybrid material, lamellar, Polymer, self-assembly, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Silicon Dioxide, polythiophene, 0104 chemical sciences, chemistry, Chemical engineering, Chemistry (miscellaneous), silica, Molecular Medicine, Polythiophene, 0210 nano-technology, Hybrid material, Oxidation-Reduction
Abstract

A new layered hybrid polythiophene-silica material was obtained directly by hydrolysis and polycondensation (sol-gel) of a silylated-thiophene bifunctional precursor, and its subsequent oxidative polymerization by FeCl3. This precursor was judiciously designed to guarantee its self-assembly and the formation of a lamellar polymer-silica structure, exploiting the cooperative effect between the hydrogen bonding interactions, originating from the ureido groups and the &pi, stacking interactions between the thiophene units. The lamellar structure of the polythiophene-silica composite was confirmed by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) analyses. The solid-state nuclear magnetic resonance (NMR), UV-Vis, and photoluminescence spectra unambiguously indicate the incorporation of polythiophene into the silica matrix. Our work demonstrates that using a polymerizable silylated-thiophene precursor is an efficient approach towards the formation of nanostructured conjugated polymer-based hybrid materials.

Published
2018
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21. Expanding the light absorption of poly(3-hexylthiophene) by end-functionalization with π-extended porphyrins

Author

Olivier Coulembier, Ahmad Mehdi, Sébastien Richeter, Mathieu Surin, Philippe Dubois, Michèle Chevrier, Roberto Lazzaroni, Rachel C. Evans, Sébastien Clément, Evans, Rachel Claire [0000-0003-2956-4857], Apollo - University of Cambridge Repository, Université de Mons (UMons), 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), Laboratoire de Chimie des Matériaux et Polymères (SMPC), Université de Mons-Hainaut, Laboratory for Chemistry of Novel Materials, Service de Chimie des Matériaux Nouveaux, and Trinity College Dublin

Subjects
Materials science, Nanotechnology, 02 engineering and technology, 010402 general chemistry, Photochemistry, 01 natural sciences, Catalysis, chemistry.chemical_compound, Molar ratio, Materials Chemistry, Absorption (electromagnetic radiation), chemistry.chemical_classification, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Metals and Alloys, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, Polymer, 0303 Macromolecular and Materials Chemistry, 021001 nanoscience & nanotechnology, Microstructure, Porphyrin, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Ceramics and Composites, Surface modification, 0210 nano-technology
Abstract

International audience; Poly(3-hexylthiophene)s end-functionalized with p-extended porphyrins have been synthesized in a one-pot procedure. The polymers show a broad absorption profile extending to 700 nm and a fibrillar microstructure, which can be tuned through judicious selection of the porphyrin molar ratio.

Published
2018
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22. Targeted design leads to tunable photoluminescence from perylene dicarboxdiimide-poly(oxyalkylene)/siloxane hybrids for luminescent solar concentrators

Author

Jochen Arlt, Camille Blayo, Niamh Willis-Fox, Sébastien Clément, Ilaria Meazzini, Rachel C. Evans, Materials and Device Photochemistry Group, Trinity University, SUPA School of Physics and Astronomy [Edinburgh], University of Edinburgh, 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), Fox, Niamh [0000-0002-0742-9411], Evans, Rachel Claire [0000-0003-2956-4857], and Apollo - University of Cambridge Repository

Subjects
Photoluminescence, Materials science, Fluorophore, 02 engineering and technology, 010402 general chemistry, Photochemistry, Branching (polymer chemistry), 01 natural sciences, 4016 Materials Engineering, chemistry.chemical_compound, Materials Chemistry, [CHIM]Chemical Sciences, 40 Engineering, 3403 Macromolecular and Materials Chemistry, 34 Chemical Sciences, food and beverages, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Siloxane, Triethoxysilane, 7 Affordable and Clean Energy, 0210 nano-technology, Hybrid material, Luminescence, Perylene
Abstract

International audience; A series of organic–inorganic hybrid materials in which a perylene carboxdiimide-bridged triethoxysilane (PDI-Sil) is covalently grafted to the siliceous domains of poly(oxyalkylene)/siloxane hybrids from the ureasil family has been synthesised (PDI-Sil-ureasils), with the aim of tailoring the optical properties towards their future application in luminescent solar concentrators (LSCs). Steady-state and time-resolved photoluminescence studies revealed that the ureasil host is able to isolate PDI-Sil, which inhibits the formation of aggregates. The ureasil also functions as an active host, with its intrinsic photoluminescence contributing to the optical properties of the hybrid material. Through strategic variation of the branchingand molecular weight of the poly(oxyalkylene) backbone, it was shown that the efficiency of energy transfer from the ureasil host to the PDI-Sil can be modulated, which tunes the emission colour from pink to orange. The chain length, rather than the number of branches, on the poly(oxyalkylene) backbone was shown to influence the photoluminescence most significantly. Since ureasils demonstrate waveguiding properties, the results indicate that covalent grafting of a fluorophore directly to a waveguide host may provide an attractive route to more efficient LSCs

Published
2018
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23. Use of Modified Colloids and Membranes to Remove Metal Ions from Contaminated Solutions

Author

Ahmad Mehdi, Sophie Lakard, Moumin Aden, Boris Lakard, Mohd Akmali Mokhter, Claire Magnenet, Sébastien Clément, M. Euvrard, Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), 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), Laboratoire de Chimie des Matériaux et Interfaces (EA 474) (LCMI), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
metal removal, adsorbents, Metal ions in aqueous solution, Colloidal silica, Inorganic chemistry, Ultrafiltration, 02 engineering and technology, membrane filtration, 010501 environmental sciences, 01 natural sciences, interfaces, Colloid and Surface Chemistry, Adsorption, hybrid silica, 0105 earth and related environmental sciences, chemical functionalization, water treatment, Aqueous solution, Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, Mesoporous silica, 021001 nanoscience & nanotechnology, Polyelectrolyte, Membrane, Chemistry (miscellaneous), 0210 nano-technology
Abstract

International audience; An efficient process was developed allowing the removal of metal ions from polycontaminated aqueous solutions by combining modified colloids and membranes. Firstly, filtration experiments were performed using polyethersulfone membranes modified by a self-assembled multilayer film of polyelectrolytes. These polymer-modified membranes allowed the uptake of more than 90% of the metal ions initially present in the contaminated solutions (for solutions concentrated at 50 mg L −1). Secondly, adsorption experiments were carried out with colloidal silica encapsulated with carboxymethyl chitosan (SiO 2-CMCS) or with mesoporous silica functionalized by grafting of 1,4,8,11-tetraazacyclotetradecane, i.e., cyclam (SiO 2-cyclam). The adsorption capacity of these compounds was shown to be higher than numerous other literature-known adsorbents, reaching 68 and 61 mg g −1 towards Cu(II) for SiO 2-CMCS and SiO 2-cyclam, respectively. Finally, by coupling adsorption with ultrafiltration in the tangential mode, the removal of Cu(II), Ni(II) and Zn(II) ions was found to be improved, allowing to reach a removal efficiency of 99% towards Cu(II), Ni(II) and Zn(II) ions at a metal concentration of 50 mg L −1 , and a promising removal efficiency around 70% at a very high metal concentration of 1200 mg L −1. The mechanisms involved in the capture of the metal ions by modified membranes and colloids are also discussed.

Published
2018
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24. Porous Porphyrin-Based Organosilica Nanoparticles for NIR Two-Photon Photodynamic Therapy and Gene Delivery in Zebrafish

Author

Nadir Bettache, Jonas G. Croissant, Vincent Chaleix, Michel Wong Chi Man, Mireille Rossel, Xavier Cattoën, Karen Tresfield, Niveen M. Khashab, Danielle Laurencin, Sébastien Richeter, Rachid Sougrat, Sébastien Clément, Jean-Olivier Durand, Chiara Mauriello Jimenez, Dina Aggad, Magali Gary-Bobo, Nicolas Cubedo, Erwan Oliviero, Marcel Garcia, Vincent Sol, Shahad Alsaiari, Marie Maynadier, Laurence Raehm, Manuel A. Roldan-Gutierrez, Clarence Charnay, Dorothée Berthomieu, Dalaver H. Anjum, 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), Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), 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), Mécanismes moléculaires dans les démences neurodégénératives (MMDN), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Santé et de la Recherche Médicale (INSERM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC), King Abdullah University of Sciences & Technologie, Optique et Matériaux (OPTIMA ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), NanoMedSyn, Laboratoire de Chimie des Substances Naturelles (LCSN), Université de Limoges (UNILIM)-Génomique, Environnement, Immunité, Santé, Thérapeutique (GEIST FR CNRS 3503), Dynamique moléculaire des interactions membranaires (DMIM), and Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)

Subjects
Materials science, medicine.medical_treatment, Confocal, Nanoparticle, Photodynamic therapy, Nanotechnology, 02 engineering and technology, Gene delivery, 010402 general chemistry, 01 natural sciences, Biomaterials, chemistry.chemical_compound, Two-photon excitation microscopy, Electrochemistry, medicine, Zebrafish, Multiphoton imaging, ComputingMilieux_MISCELLANEOUS, biology, [CHIM.ORGA]Chemical Sciences/Organic chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, biology.organism_classification, Porphyrin, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, chemistry, 0210 nano-technology
Abstract

C.M.J. and D.A. contributed equally to this work. The grant “Chercheur d'Avenir Languedoc-Roussillon” attributed to M.G.-B. and the ANR nanoptPDT are gratefully acknowledged. The authors thank L. Lichon for technical assistance. DFT calculations were performed using HPC resources from the CINES (projects x2016087394 and x2015087394), and from the CALMIP (Grant 2016-[P16042]). The authors thank MRI (Montpellier RIO Imaging platform) for confocal and multiphoton imaging facilities.

Published
2018
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25. Heterogenized Catalysis on Metals Impregnated Mesoporous Silica

Author

Ahmad Mehdi, Fatima Abi Ghaida, and Sébastien Clément

Subjects
Materials science, Chemical engineering, 02 engineering and technology, Mesoporous silica, 010402 general chemistry, 021001 nanoscience & nanotechnology, 0210 nano-technology, 01 natural sciences, 0104 chemical sciences, Catalysis
Published
2018
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26. Saturation, of the Siliceous Zeolite TON with Neon at High Pressure

Author

Olivier Cambon, Benoit Coasne, Sébastien Clément, Arie van der Lee, Jérôme Rouquette, Mario Santoro, Francesco Di Renzo, Gaston Garbarino, Federico A. Gorelli, Kamil Dziubek, Julien Haines, Jean-Marc Thibaud, 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), Istituto per i Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche, Unità Organizzativa di Supporto di Roma, European Synchrotron Radiation Facility (ESRF), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), 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 Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), and Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
Diffraction, Phase transition, Materials science, Physics::Instrumentation and Detectors, Analytical chemistry, chemistry.chemical_element, zeolites, 02 engineering and technology, Crystal structure, 010402 general chemistry, 01 natural sciences, Physics::Geophysics, Neon, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, Zeolite, Argon, rare gases under pressure, nano-confinement of dense matter, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, General Energy, chemistry, Ton, 0210 nano-technology, Saturation (chemistry)
Abstract

International audience; The insertion of neon and argon in the 1-D pore system of the zeolite TON was studied at high pressure by X-ray diffraction and by Monte Carlo (MC) molecular modeling. Rietveld refinements of the crystal structure of TON and the MC results indicate that 12 Ne atoms enter the unit cell of TON, completely filling the pores. This is much greater than the degree of filling observed for argon, which due to size considerations lies in a vertical plane in the pores. A phase transition from the Cmc21 to a Pbn21 structure occurs at 0.6 GPa with cell doubling. The compressibility and structural distortions, such as pore ellipticity, are considerably reduced as compared to the argon-filled or the empty-pore material. In addition, the crystalline form persists to pressures of the order of 20 GPa, and the Pbn21 phase is recovered after decompression. The results show the very strong and different effects of pore filling by noble gases on the structural stability and mechanical properties of this prototypical 1-D zeolite-type material.

Published
2018
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27. Regioregular Polythiophene-Porphyrin Supramolecular Copolymers for Optoelectronic Applications

Author

Wouter Maes, Arie van der Lee, Sébastien Clément, Sébastien Richeter, Jurgen Kesters, Olivier Coulembier, Rachel C. Evans, Mathieu Surin, Philippe Dubois, Michèle Chevrier, Camille Blayo, Roberto Lazzaroni, Ahmad Mehdi, 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), Université de Mons (UMons), Hasselt University (UHasselt), Materials and Device Photochemistry Group, Trinity University, 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 de Chimie des Matériaux et Polymères (SMPC), Université de Mons-Hainaut, and Laboratory for Chemistry of Novel Materials

Subjects
Materials science, Polymers and Plastics, Organic solar cell, Supramolecular chemistry, 02 engineering and technology, Conjugated system, 010402 general chemistry, Photochemistry, 7. Clean energy, 01 natural sciences, Polymer solar cell, chemistry.chemical_compound, Polymer chemistry, Materials Chemistry, Copolymer, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, Organic electronics, Organic Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Porphyrin, 0104 chemical sciences, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Polythiophene, 0210 nano-technology
Abstract

International audience; Conjugated poly(3-hexylthiophene) copolymer derivatives containing 10% appended porphyrin moieties are prepared using a supramolecular approach toward applications in organic electronics. The self-assembled polythiophene–porphyrin copolymers are synthesized by coordinationof the porphyrinato central zinc ions to the imidazole-functionalized polythiophene side chains.Evidence for the self-assembly process is provided by 1H NMR spectroscopy, single crystal X-ray diffraction, and optical absorption studies on model compounds. The polythiophene–porphyrin copolymers show an extended absorption window in the region of 420–650 nm due to the contribution of the porphyrin. Photoluminescence studies indicate concentration dependent energy transfer from P3HT to the porphyrin. Preliminary photovoltaic studies are performed by combining the polythiophene–porphyrin copolymers with PC 61 BM in the photoactive layer of bulk heterojunction organic solar cells.

Published
2015
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28. Stress corrosion and droplets formation in calcium phosphate and calcium alumino-phosphate glasses

Author

Annelise Faivre, Jean-Marc Fromental, Florence Despetis, Laurent Duffour, Sébastien Clément, Stephanie Etter, Pierre Solignac, Laboratoire Charles Coulomb (L2C), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Materials science, Mechanical Engineering, Metallurgy, Humidity, Cleavage (crystal), 02 engineering and technology, 021001 nanoscience & nanotechnology, Phosphate, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Corrosion, Phosphate glass, Crack closure, chemistry.chemical_compound, chemistry, Mechanics of Materials, Phase (matter), mental disorders, 0103 physical sciences, General Materials Science, Relative humidity, Composite material, 0210 nano-technology
Abstract

Subcritical crack growth and crack closure are analysed using the double cleavage drilled compression method, in two calcium phosphate-based glasses. The measurements of the crack velocity as a function of temperature, from ambient to 250 °C, are reported for two different relative humidity levels. Studied glasses present unusual trends characterized by a non-gradual shift of V–K I curves versus temperature. Moreover, when the load is released and crack closes, expulsion of a “liquid-like” phase is observed forming droplets along the crack path. These droplets are only formed at certain temperatures, but both under high and low water humidity. They evolve towards residues when temperature is decreased.

Published
2015
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29. Assembly of Coordination Polymers Using Thioether-Functionalized Octasilsesquioxanes: Occurrence of (CuX) n Clusters (X=Br and I) within 3D-POSS Networks

Author

Sébastien Clément, Ahmad Mehdi, Lydie Viau, Carsten Strohmann, Sébastien Richeter, Michael Knorr, Abhinav Raghuvanshi, Jean-Baptiste Tissot, Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Dortmund University of Technology, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and 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)

Subjects
Organic Chemistry, Inorganic chemistry, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Catalysis, 0104 chemical sciences, chemistry.chemical_compound, Crystallography, Thioether, chemistry, Cubane, Cluster (physics), [CHIM]Chemical Sciences, Thermal stability, Self-assembly, SBus, 0210 nano-technology, Hybrid material, Single crystal, ComputingMilieux_MISCELLANEOUS
Abstract

For the first time, POSS-based coordination polymers (CPs) have been structurally characterized. These CPs were obtained in high yield via self-assembly reactions of thioether-functionalized polysilsesquioxanes with CuI salts under mild conditions. Single crystal analyses revealed the formation of 3D networks incorporating different secondary building units (SBUs) as connection nodes. The nature of the -SAr functionality allows a fine-tuning of the cluster nuclearity, that is, butterfly-shaped Cu2 X2 or closed cubane-type Cu4 I4 cores. As such, the resulting hybrid materials exhibit a combination of high thermal stability arising from the inorganic POSS core along with interesting luminescent properties conferred by the cubane cluster core. Furthermore, the occurrence of channels has been shown crystallographically in the case of the Cu4 I4 cluster containing CP.

Published
2017
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30. Flexible and conductive multilayer films based on the assembly of PEDOT:PSS and water soluble polythiophenes

Author

Lydie Viau, C.C. Buron, Ahmad Mehdi, Sébastien Clément, F.E. Jurin, Boris Lakard, Nicolas Martin, C. Filiâtre, Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), 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), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, 02 engineering and technology, Conductive polyelectrolyte multilayer, Conductivity, 010402 general chemistry, 01 natural sciences, Biomaterials, Polystyrene sulfonate, chemistry.chemical_compound, Van der Pauw method, PEDOT:PSS, P3HT-based conjugated polyelectrolyte, Polymer chemistry, Materials Chemistry, Seebeck effect, Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, Layer by layer, General Chemistry, Polymer, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Layer-by-layer, Conjugated Polyelectrolytes, Polyelectrolyte, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Chemical engineering, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 0210 nano-technology
Abstract

International audience; Flexible conductive polyelectrolyte multilayer films built upon anionic poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and cationic poly(3-hexylthiophene)-based conjugated polyelectrolytes (P3HT-R) containing imidazolium, pyridinium and phosphonium ionic groups were prepared using electrostatic layer-by-layer assembly. Adsorbed amount of each polyelectrolyte strongly increases when divalent cations (Ba2+) are employed as electrolyte and when the rinsing step is avoided during the build-up. The electrical properties of these (P3HT-R/PEDOT:PSS)n multilayer films were then investigated using the van der Pauw method leading to an average conductivity of ∼2 S m−1. Semiconducting behavior of these organic coatings was demonstrated by the direct relationship between the conductivity and the temperature. (P3HT-R/PEDOT:PSS)n multilayer films exhibited p-type semiconducting behavior as showed by Seebeck measurements. Finally, these films were successfully deposited onto flexible polymer sheets and their conductivity was found to be not affected by applying a bending stress.

Published
2017
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31. SH-functionalized cubic mesostructured silica as a support for small gold nanoparticles

Author

Ahmad Mehdi, Sébastien Clément, Stéphane Daniele, Chloé Thieuleux, Arnaud Boullanger, Violaine Mendez, 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), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Laboratoire de Chimie, Catalyse, Polymères et Procédés, R 5265 (C2P2), Centre National de la Recherche Scientifique (CNRS)-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)

Subjects
inorganic chemicals, Materials science, General Chemical Engineering, education, technology, industry, and agriculture, [CHIM.CATA]Chemical Sciences/Catalysis, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, General Chemistry, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Highly selective, 01 natural sciences, 0104 chemical sciences, Catalysis, Chemical engineering, Colloidal gold, 0210 nano-technology
Abstract

International audience; Gold nanoparticles supported on cubic mesostructured silica have been synthesized leading to a highly selective catalyst for aerobic oxidation of trans-stilbene.

Published
2013
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32. Elastic moduli of XAlSiO4 aluminosilicate glasses: effects of charge-balancing cations

Author

Sébastien Clément, Coralie Weigel, Rémy Vialla, Christelle Dupas, Benoit Ruffle, Charles Le Losq, Daniel R. Neuville, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), and Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Université Paris Diderot - Paris 7 (UPD7)-IPG PARIS-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
Brillouin Spectroscopy, Materials science, Condensed matter physics, Scattering, Mineralogy, 02 engineering and technology, 010502 geochemistry & geophysics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Brillouin zone, symbols.namesake, Condensed Matter::Materials Science, Brillouin scattering, Aluminosilicate, Materials Chemistry, Ceramics and Composites, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Glass transition, Elastic modulus, 0105 earth and related environmental sciences, Debye
Abstract

International audience; Brillouin spectroscopy is used to investigate the elastic properties of XAlSiO4 aluminosilicate glasses where X =Li, Na, K, Mg0.5, Ca0.5, Sr0.5, Ba0.5, and Zn0.5. The Brillouin frequency shifts obtained in two different scattering geometries allow the calculation of the refractive index, the two sound velocities and Poisson's ratio.Measurements of the mass density give in turn the elastic moduli and the Debye temperature.We find that the elastic properties scale with the atomic density of the glassy network or the charge-balancing cation field strengthwhile they negatively correlate with the glass transition temperature. Further, Poisson's ratio depends on the nature of the non-framework cations in this glass series.

Published
2016
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33. Polarized Raman spectroscopy of v-SiO2 under rare-gas compression

Author

Mathieu Kint, Sébastien Clément, Alain Polian, René Vacher, Coralie Weigel, Benoit Ruffle, Bernard Hehlen, Marie Foret, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Rare gas, Materials science, Isotropy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Molecular physics, Stiffening, symbols.namesake, Nuclear magnetic resonance, Central force, 0103 physical sciences, Compressibility, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 010306 general physics, 0210 nano-technology, Raman spectroscopy, Shrinkage
Abstract

International audience; High-pressure polarized Raman spectra of vitreous silica are measured up to 8 GPa in a diamond-anvil cell atroom temperature. The combined use of either a nonpenetrating pressurizing medium—argon—or a penetrating one—helium, allows one to separate density from stress effects on the Raman frequencies. In the framework of a simple central force model, the results emphasize the distinct role played by the shrinkage of the intertetrahedral angle Si-O-Si and the force-constant stiffening during the compression. The polarization analysis further reveals the existence of an additional isotropic component in the high-frequency wing of the boson peak. The pressure dependence of the genuine boson peak frequency is found to be much weaker than previously reported and even goes through a minimum around 2 GPa in remarkable coincidence with the anomalous compressibility maximum of silica.

Published
2016
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34. From an Octakis(3‐cyanopropyl)silsesquioxane Building Block to a Highly COOH‐Functionalized Hybrid Organic–Inorganic Material

Author

Guillaume Gracy, Ahmad Mehdi, Nicolas Bibent, Sébastien Clément, Sabine Devautour-Vinot, and Arnaud Boullanger

Subjects
Thermogravimetric analysis, Hydrogen bond, Chemistry, Chemical modification, 02 engineering and technology, Nuclear magnetic resonance spectroscopy, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Silsesquioxane, 0104 chemical sciences, Inorganic Chemistry, chemistry.chemical_compound, Adsorption, Solid-state nuclear magnetic resonance, Polymer chemistry, 0210 nano-technology, Hybrid material
Abstract

A new nanostructured and highly COOH-functionalized hybrid organic–inorganic material has been synthesized by the hydrolysis of oligomeric octahedral silsesquioxane (POSS), which contains eight cyanopropyl groups. The hybrid, elemental building block oligomeric octakis(3-cyanopropyl)silsesquioxane (CN-POSS) was synthesized from oligomeric octakis(3-chloropropyl)silsesquioxane (Cl-POSS) by an exchange reaction. The formation and nanostructuration of the COOH-functionalized hybrid material were induced by noncovalent hydrogen bonding between COOH-POSS units without decomposition of the core. The material has been fully characterized by scanning electron microscopy, FTIR and 1H, 13C, and 29Si solid-state NMR spectroscopy, X-ray diffraction, and elemental analysis, which confirm that the POSS core remains intact after each chemical modification step. Thermogravimetric analysis indicates that the organic units are thermally stable up to 200 °C. The activation energy related to the proton conductivity of COOH-POSS has been evaluated and confirms the presence of strong hydrogen bonds. Finally, the accessibility and adsorption capacity of the COOH groups towards transition metal ions have been demonstrated and underline the potential of these hybrid materials in extraction chemistry.

Published
2011
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35. Photodynamic Therapy: Porous Porphyrin-Based Organosilica Nanoparticles for NIR Two-Photon Photodynamic Therapy and Gene Delivery in Zebrafish (Adv. Funct. Mater. 21/2018)

Author

Marcel Garcia, Nicolas Cubedo, Rachid Sougrat, Vincent Sol, Jean-Olivier Durand, Erwan Oliviero, Magali Gary-Bobo, Vincent Chaleix, Danielle Laurencin, Mireille Rossel, Karen Tresfield, Niveen M. Khashab, Xavier Cattoën, Nadir Bettache, Dorothée Berthomieu, Sébastien Clément, Chiara Mauriello Jimenez, Manuel A. Roldan-Gutierrez, Sébastien Richeter, Dina Aggad, Jonas G. Croissant, Michel Wong Chi Man, Marie Maynadier, Laurence Raehm, Dalaver H. Anjum, Shahad Alsaiari, and Clarence Charnay

Subjects
Materials science, biology, medicine.medical_treatment, Nanoparticle, Photodynamic therapy, 02 engineering and technology, Gene delivery, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, biology.organism_classification, 01 natural sciences, Porphyrin, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Biomaterials, chemistry.chemical_compound, Two-photon excitation microscopy, chemistry, Electrochemistry, Zebrafish embryo, medicine, Biophysics, 0210 nano-technology, Zebrafish
Published
2018
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36. Self-assembled conjugated polyelectrolyte?surfactant complexes as efficient cathode interlayer materials for bulk heterojunction organic solar cells

Author

Rachel C. Evans, Philippe Dubois, Ann E. Terry, Olivier Coulembier, Ahmad Mehdi, Bruno Van Mele, Wouter Maes, Judith E. Houston, Niko Van den Brande, Roberto Lazzaroni, Jurgen Kesters, Sébastien Richeter, Sébastien Clément, Michèle Chevrier, Materials and Chemistry, Physical Chemistry and Polymer Science, Université de Mons (UMons), 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), Trinity College Dublin, Hasselt University (UHasselt), Vrije Universiteit Brussel (VUB), ISIS-CCLRC, STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC)-Science and Technology Facilities Council (STFC), Evans, Rachel Claire [0000-0003-2956-4857], and Apollo - University of Cambridge Repository

Subjects
3403 Macromolecular and Materials Chemistry, 34 Chemical Sciences, Renewable Energy, Sustainability and the Environment, Library science, Nanotechnology, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 4016 Materials Engineering, 0104 chemical sciences, Self assembled, Conjugated polyelectrolyte, [CHIM.POLY]Chemical Sciences/Polymers, Work (electrical), Political science, General Materials Science, European commission, Science policy, Cost action, 7 Affordable and Clean Energy, 0210 nano-technology, 40 Engineering
Abstract

International audience; Interfacial engineering is poised to play a key role in delivering solution-processable organic solar cells that simultaneously feature low cost and high efficiency. Here, we report the strategic design, synthesis and characterisation of phosphonium-functionalised polythiophene homo- (P3HTPMe3) and diblock (P3HT-b-P3HTPMe3) conjugated polyelectrolytes (CPEs) coupled with either bromide (Br-) or dodecylsulfate (DS-) surfactant counterions, for application as cathodic interlayers in polymer solar cells. The counterion is shown to have a pronounced effect on the properties of the CPEs in solution. Optical studies revealed that the bulkier DS- counterion hinders interchain interactions more effectively, leading to a moderate blue-shift in the absorption and emission maxima. Similarly, small-angle neutron scattering (SANS) studies also indicated that the solution structures, solvent content, and therefore hydrophobicity, were extremely dependent on both the CPE structure and counterion. The effect of the CPE structure on the thermal properties of the CPE-surfactant complexes was also investigated by Rapid Heat–Cool calorimetry (RHC) measurements. CPE-DS complexes were subsequently employed as cathodic interfacial layers and shown to boost the efficiency of PBDTTPD:PC71BM solar cells, leading to enhanced power conversion efficiencies of 8.65% and 8.78% (on average) for P3HTPMe3,DS and P3HT-b-P3HTPMe3,DS, respectively. These values are siginificantly higher (~20%) than those for the corresponding device incorporating a Ca interfacial layer (7.18%), which is attributed to an increase in short-circuit current density. Atomic force microscopy studies revealed distinctions in the adhesion efficiencies of the CPE-DS complexes to the photoactive layer, which is attributed to differences in the relative hydrophobicity of the CPEs in the deposition solution.

Published
2015
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37. A facile synthesis of proton-conducting organic-inorganic membranes

Author

Ahmad Mehdi, Jean-Pierre Habas, Sébastien Clément, Sabine Devautour-Vinot, Mathieu Meyer, Ajfane Cheik Ibrahim, Daoud Naoufal, 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), Faculté des Sciences, and Université Libanaise

Subjects
Thermogravimetric analysis, Proton conductivity, Materials science, Filtration and Separation, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Biochemistry, Catalysis, chemistry.chemical_compound, Differential scanning calorimetry, Polymer chemistry, General Materials Science, Physical and Theoretical Chemistry, Sol-gel, Multifunctional membrane, Dynamic mechanical analysis, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Membrane, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Hybrid materials, 0210 nano-technology, Hybrid material, Ethylene glycol, Nuclear chemistry
Abstract

Hybrid organic–inorganic proton conducting membranes based on arylsulfonic acid (Ar-SO 3 H) groups and poly(ethylene glycol) (PEG) units were easily obtained in one step synthesis by co-hydrolysis and polycondensation of 2-(4-Chlorosulfonylphenyl)ethyl trimethoxysilane and bis-silylated polyethylene oxide. The hydrolysis of SO 2 Cl groups into SO 3 H was achieved during the sol–gel process by the in situ generated HCl acting as catalyst for the hydrolysis and polycondensation reactions. All membranes were characterized by 1 H, 13 C and 29 Si MAS solid-state NMR, elementary analysis, Scanning Electron Microscopy (SEM) and X-ray photoelectron (XPS) spectroscopy. Their thermal and thermomechanical properties were investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA), respectively.. The thermomechanical and conductive properties were found to be dependent on the PEG chain length and the PMMA amount. The proton conductivities of these materials were found to be approximately 10 −2 S cm −1 at 20 °C.

Published
2014
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38. 2,5-Thiophene Substituted Spirobisiloles - Synthesis, Characterization, Electrochemical Properties and Performance in Bulk Heterojunction Solar Cells

Author

Cyril Poriel, Kassem Amro, Anil K. Thakur, Sébastien Clément, Philippe Gerbier, Lionel Hirsch, Joëlle Rault-Berthelot, William E. Douglas, 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), Laboratoire de l'intégration, du matériau au système (IMS), Université Sciences et Technologies - Bordeaux 1-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), 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)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
spirobisilole, Band gap, Electron donor, 02 engineering and technology, 010402 general chemistry, Photochemistry, 01 natural sciences, 7. Clean energy, Catalysis, Polymer solar cell, AIE, chemistry.chemical_compound, Materials Chemistry, Thiophene, HOMO/LUMO, [CHIM.ORGA]Chemical Sciences/Organic chemistry, General Chemistry, Hybrid solar cell, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Acceptor, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, chemistry, electrochemistry, solar cells, Cyclic voltammetry, 0210 nano-technology
Abstract

International audience; New spirobisilole molecules containing thienyl (DTSBS) and bis-thienyl (BBTSBS) electron donor groups have been synthesized for use as the donor material in bulk-heterojunction solar cells together with PCBM. The spectroscopic, electrochemical and thermal properties of DTSBS and BBTSBS have been investigated. All these new spirobisiloles exhibit excellent thermal stability. Cyclic voltammetry measurements revealed reversible and irreversible oxidation and irreversible reduction processes. The highest occupied and lowest unoccupied molecular orbital (HOMO/LUMO) energy levels were determined from electrochemical measurements and DFT calculations. The HOMO/LUMO energy levels were estimated to lie in the range -5.2 to -2.3 eV for DTSBS and -4.9 to -2.6 eV for BBTSBS. For both compounds, electropolymerization processes occur at potentials higher than 1.5 V leading to low band gap electrogenerated polymers. Spin-coating-deposited bulk-heterojunction solar cells fabricated with the novel spirobisiloles as donor and PCBM as acceptor displayed open-circuit voltages up to 0.4 V, short-circuit currents around 0.5 mA.cm-2, and power conversion efficiencies approaching 0.1 %.

Published
2013
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39. Synthesis and characterization of carboxystyryl end-functionalized poly(3-hexylthiophene) / TiO2 hybrids in view of photovoltaic applications

Author

Olivier Coulembier, Danielle Laurencin, Sébastien Richeter, Amandine Thomas, Guylhaine Clavel, Philippe Dubois, Pascal Gerbaux, Julien De Winter, Florian Boon, Ahmad Mehdi, David Moerman, Roberto Lazzaroni, Sébastien Clément, Laboratory for Chemistry of Novel Materials, Université de Mons (UMons), Laboratoire de Chimie des Matériaux et Polymères (SMPC), Université de Mons-Hainaut, 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), and Laboratoire de Chimie Organique

Subjects
Thermogravimetric analysis, Materials science, Nanoparticle, 02 engineering and technology, 010402 general chemistry, 7. Clean energy, 01 natural sciences, Miscibility, chemistry.chemical_compound, Bromide, Polymer chemistry, Materials Chemistry, luminescence, TiO2, chemistry.chemical_classification, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Mechanical Engineering, Metals and Alloys, Polymer, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, poly(3-hexyl)thiophene, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Chemical engineering, Mechanics of Materials, Transmission electron microscopy, Wittig reaction, Nanoparticles, solid-state NMR, AFM, 0210 nano-technology, Luminescence
Abstract

International audience; Regioregular head-to-tail -bromo--carboxystyryl poly(3-hexylthiophene) (P3HT-COOH) has been prepared by a Wittig reaction of -bromo--formyl poly(3-hexylthiophene) (P3HT-CHO) with [(4-carboxyphenyl)methyl]triphenylphosphonium bromide. This carboxylic end-group functionalized polymer was used to functionalize TiO2 nanoparticles in view of improving the miscibility between poly(3-hexylthiophene) and the nanoparticles, for future photovoltaic applications. The anchoring of the polymer on the surface of the TiO2 nanoparticles was demonstrated by sedimentation tests in THF, and by thermogravimetric analysis (TGA), Transmission Electron Microscopy (TEM), 1H MAS solid-state NMR, UV-Vis and X-ray photoelectron spectroscopies. Films were produced by solvent casting and the dispersion of the TiO2 nanoparticles was evaluated by Atomic Force Microscopy (AFM). Fluorescence quenching studies in CHCl3 were performed on these hybrids materials.

Published
2012
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40. Novel Tetraaryltetracyanoporphyrazine Vanadyl Complexes with Enhanced Electron Withdrawing Properties

Author

Ilya S. Grigoryev, S. A. Lermontova, Georgy A. Domrachev, Victor V. Semenov, L. G. Klapshina, William E. Douglas, Sébastien Clément, B. A. Bushuk, G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences [Moscow] (RAS), B. I. Stepanov Institute of Physics [Minsk], National Academy of Sciences of Belarus (NASB), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and 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)

Subjects
Chemistry, Polar effect, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 0210 nano-technology, Photochemistry, 01 natural sciences, ComputingMilieux_MISCELLANEOUS, 3. Good health, 0104 chemical sciences
Abstract

International audience

Published
2012
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41. Micro-Brillouin spectroscopy mapping of the residual density field induced by Vickers indentation in a soda-lime silicate glass

Author

Rémy Vialla, Huy-Nam Tran, Benoit Ruffle, Damien Vandembroucq, Sébastien Clément, Laboratoire des colloïdes, verres et nanomatériaux (LCVN), Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et mécanique des milieux hétérogenes (UMR 7636) (PMMH), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), and ANR-05-BLAN-0367,PLASTIGLASS,Modélisation multi-échelles et techniques micro-spectroscopiques pour l'étude de la plasticité des verres(2005)

Subjects
010302 applied physics, Condensed Matter - Materials Science, Brillouin Spectroscopy, Materials science, Physics and Astronomy (miscellaneous), Isotropy, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, 02 engineering and technology, Disordered Systems and Neural Networks (cond-mat.dis-nn), Condensed Matter - Disordered Systems and Neural Networks, 021001 nanoscience & nanotechnology, Residual, 01 natural sciences, Brillouin zone, chemistry.chemical_compound, Soda lime, chemistry, Brillouin scattering, Indentation, 0103 physical sciences, Vickers hardness test, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Composite material, 0210 nano-technology
Abstract

High-resolution Brillouin scattering is used to achieve 3-dimensional maps of the longitudinal acoustic mode frequency shift in soda-lime silicate glasses subject to Vickers indentations. Assuming that residual stress-induced effects are simply proportional to density changes, residual densification fields are obtained. The density gradient is nearly isotropic, confirming earlier optical observations made on a similar glass. The results show that Brillouin micro-spectroscopy opens the way to a fully quantitative comparison of experimental data with predictions of mechanical models for the identification of a constitutive law., Comment: 4 pages, 3 figures, revised version, to appear in Appl. Phys. Lett

Published
2012
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42. Efficient Luminescent Solar Concentrators Based on Defectless Organic Glasses Containing Novel Ytterbium Cyanoporphyrazine Complex

Author

B. A. Bushuk, Sébastien Clément, V. V. Treushnikov, Victor V. Semenov, V. M. Treushnikov, William E. Douglas, L. G. Klapshina, S. A. Lermontova, Ilya S. Grigoryev, G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences [Moscow] (RAS), NPP Reper-NN, B. I. Stepanov Institute of Physics [Minsk], National Academy of Sciences of Belarus (NASB), 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), Russian Ministry of Education and Science, SC 16 740 11 0015, the Russian Foundation for Basic Research, grants 12 04 90031 Bel_a, 11 04 97100 r_povolzhye_a, and and the Presidium Program of the Russian Academy of Sciences 'Directed Synthesis of Compounds with Desired Properties and the Creation of Functional Materials Based on Them.'

Subjects
Ytterbium, Materials science, Luminescent solar concentrator, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, Concentrator, 01 natural sciences, 7. Clean energy, law.invention, law, Solar cell, General Materials Science, business.industry, Doping, Photovoltaic system, General Engineering, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Solar energy, 0104 chemical sciences, chemistry, Optoelectronics, 0210 nano-technology, business, Luminescence
Abstract

International audience; A photocurable polymeric luminescent composition doped by a new ytterbium tetra(4 fluorophe nyl)tetracyanoporphyrazine complex capable of efficiently absorbing and reemitting light in a wide spectral range is developed. Defect free organic glasses obtained with the use of this composition were applied as waveguides in the creation of laboratory models of a luminescent solar concentrator. Tests results of the cre ated models showed the possibility of creating a stationary solar energy concentrator for photovoltaic cells (PVCs) which is at least as efficient as the best kinds of similar devices previously found worldwide.

Published
2012
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43. Dynamical origin of anomalous temperature hardening of elastic modulus in vitreous silica

Author

Huy-Nam Tran, Jean-Claude Chervin, René Vacher, Marie Foret, Rémy Vialla, Benoit Ruffle, Alain Polian, P. Munsch, Simon Ayrinhac, Sébastien Clément, Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des colloïdes, verres et nanomatériaux (LCVN), Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Condensed matter physics, Anharmonicity, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, PACS : 64.70.kj, 78.35.+c, 62.50.−p, 62.40.+i, Electronic, Optical and Magnetic Materials, law.invention, Vibration, Classical mechanics, law, Brillouin scattering, 0103 physical sciences, Thermal, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Hardening (metallurgy), Thermal relaxation, Hydrostatic equilibrium, 010306 general physics, 0210 nano-technology, Elastic modulus
Abstract

International audience; High-resolution Brillouin scattering experiments are performed under hydrostatic pressures ranging from 0 to 10 GPa in vitreous silica. The hypersound-attenuation coefficient exhibits a sharp maximum located at 2 GPa, which appears to coincide with the well-known minimum in sound velocity. Two main processes contribute to sound damping: the thermal relaxation of local defects and the anharmonic interactions with thermal vibrations. By analyzing the temperature dependence of the velocity and subtracting the changes produced by the above mechanisms, the unrelaxed velocity is found. It is constant at low temperatures and increases anomalously above a temperature onset.We show that the onset strongly depends on pressure, which is in agreement with a dynamical origin of the structural changes that produce the hardening.

Published
2011
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44. (E)-3-(2,3,4,5,6-Pentafluorostyryl)thiophene

Author

Christophe M. L. Vande Velde, Olivier Coulembier, Franck Meyer, Matthias Zeller, Sébastien Clément, Laboratoire de Chimie des Matériaux et Polymères (SMPC), Université de Mons-Hainaut, Laboratoire de Chimie des Polymères, Université libre de Bruxelles (ULB), Department of chemistry, Youngstown State University (YSU), Department of Applied Science, and Karel de Grote University College

Subjects
Physique de l'état condense [struct. électronique, etc.], Thio, 02 engineering and technology, Dihedral angle, Physique de l'état condense [struct. propr. thermiques, etc.], 010402 general chemistry, Bioinformatics, 01 natural sciences, Medicinal chemistry, Organic Papers, lcsh:Chemistry, chemistry.chemical_compound, Bromide, Thiophene, Chimie, General Materials Science, Physique de l'état condense [supraconducteur], Phene, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 3. Good health, 0104 chemical sciences, Sodium hydride, chemistry, lcsh:QD1-999, Métallurgie et mines, Yield (chemistry), 0210 nano-technology
Abstract

The reaction of thio-phene-3-carboxaldehyde and perfluoro-benzyl-triphenyl- phospho-nium bromide in the presence of sodium hydride gave the title compound, C12H5F5S, in 70% yield. The thiophene and perfluorophenyl groups form a dihedral angle of 5.4 (2)°. The structure is characterized by a head-to-tail organization in a columnar arrangement due to π-π inter-actions between the thio-phene and penta-fluoro-phenyl rings with centroid-centroid distances in the range 3.698 (2)-3.802 (2) Å., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2010
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45. Synthesis and Supramolecular Organization of Regioregular Polythiophene Block Oligomers

Author

Jean-Yves Balandier, Julien De Winter, Sergey Sergeyev, Olivier Coulembier, Philippe Dubois, Sébastien Clément, Pascal Gerbaux, Roberto Lazzaroni, Christophe M. L. Vande Velde, Yves Geerts, Matthias Zeller, Franck Meyer, Laboratoire de Chimie des Matériaux et Polymères (SMPC), Université de Mons-Hainaut, Laboratoire de Chimie des Polymères, Université libre de Bruxelles (ULB), Laboratoire de Chimie Organique, Department of Applied Science, Karel de Grote University College, Department of chemistry, Youngstown State University (YSU), Laboratory for Chemistry of Novel Materials, and Université de Mons (UMons)

Subjects
Cyclic compound, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Organic Chemistry, Supramolecular chemistry, Aromaticity, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, Oligomer, Chemical synthesis, 0104 chemical sciences, Chemistry, chemistry.chemical_compound, chemistry, Polymer chemistry, Thiophene, Polythiophene, Molecule, 0210 nano-technology
Abstract

International audience; The self-assembly of functional polythiophenes was studied by a bottom-up approach “from molecule to polymer”. The synthesis and the X-ray structure of 2,5-dibromo-3-styryl and 3-2',3',4',5',6'-pentafluorostyryl-thiophenes revealed a supramolecular arrangement controlled by π-π interactions between the aromatic rings. A [2+2] photocyclization reaction in the solid state of (E)-1-2',5'-dibromo-3'-thienyl-2-pentafluorophenylethene triggers the formation of a rare cycloadduct composed by thiophene rings. The X-ray analysis confirmed its rctt stereochemistry. The synthesis of P3HT-b-P3ST and P3HT-b-P3STF block oligomers was achieved by a GRIM method in good yields. An indirect proof of well-defined nanostructured organization was provided by the partial photocyclization of pendant styryl moieties under UV-irradiation.

Published
2010
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46. Supported thin flexible polymethylhydrosiloxane permeable films functionalised with silole groups: new approach for detection of nitroaromatics

Author

Jean-Marc Janot, Thierry Thami, Philippe Gerbier, William E. Douglas, Sébastien Clément, Kassem Amro, Philippe Déjardin, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), 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), Institut Européen des membranes (IEM), 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
Materials science, Polymethylhydrosiloxane, Quenching (fluorescence), Hydrosilylation, [CHIM.ORGA]Chemical Sciences/Organic chemistry, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, 0104 chemical sciences, Highly sensitive, chemistry.chemical_compound, chemistry, Covalent bond, Phase (matter), Materials Chemistry, Thin film, 0210 nano-technology, Luminescence
Abstract

International audience; Novel re-useable luminescent sensors highly sensitive to quenching by nitroaromatic compounds in both solution and the vapour phase have been developed by covalently bonding a new allyl-substituted silole into substrate-supported crosslinked polymethylhydrosiloxane (PMHS) thin films by Pt-catalyzed hydrosilylation of the SiH groups.

Published
2010
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47. In situ high pressure and high temperature Raman studies of (1-x)SiO2xGeO2 glasses

Author

M Cambon, Claire Levelut, R. Le Parc, Julien Haines, V Ranieri, Olivier Cambon, Sébastien Clément, Laboratoire des colloïdes, verres et nanomatériaux (LCVN), Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and 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)

Subjects
In situ, Chemistry, Mixing (process engineering), Analytical chemistry, Mineralogy, 02 engineering and technology, Pressure dependence, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Condensed Matter::Disordered Systems and Neural Networks, Condensed Matter::Soft Condensed Matter, symbols.namesake, High pressure, Raman band, 0103 physical sciences, symbols, General Materials Science, Binary system, [PHYS.COND.CM-DS-NN]Physics [physics]/Condensed Matter [cond-mat]/Disordered Systems and Neural Networks [cond-mat.dis-nn], 010306 general physics, 0210 nano-technology, Raman spectroscopy, Germanium oxide
Abstract

International audience; The structure of glasses in the binary system SiO2-GeO2 has been studied by Raman spectroscopy. Our results are consistent with mixing of SiO2 and GeO2 tetrahedra. The changes induced by temperature and by pressure on the structure are monitored by in situ measurements on the same mixed glasses. Anomalous temperature dependences are observed not only for SiO2 glass and GeO2 glass but also for mixed glasses. Particular attention is focused on the pressure densification mechanism in mixed glasses. Via the pressure dependence of the width of the main Raman band, we show that the compression mechanism in mixed glasses is intermediate between that of the end members.

Published
2009
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48. Conjugated Organometallic Polymer Containing a Redox Active Center

Author

Karl Gagnon, Michael P. Stewart, Pierre D. Harvey, Sébastien Clément, Jean-François Bérubé, Daniel Fortin, William E. Geiger, Département de chimie [Sherbrooke] (UdeS), Faculté des sciences [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS)-Université de Sherbrooke (UdeS), Université de Sherbrooke (UdeS), Dpartment of Chemistry, Université du Vermont, Department of Chemistry, University of Vermont [Burlington], and Université de Vermont

Subjects
chemistry.chemical_classification, Organometallic polymer, 02 engineering and technology, Polymer, Conjugated system, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, 3. Good health, 0104 chemical sciences, Quinone, Inorganic Chemistry, symbols.namesake, chemistry, Polymer chemistry, symbols, Redox active, Physical and Theoretical Chemistry, 0210 nano-technology, Raman spectroscopy, Diimine
Abstract

The new conjugated organometallic polymer (-spacer-C[triple bond]C-Pt(PBu3)2-C[triple bond]C-)n (3; spacer = para-bis(diphenyl(tetramethyl)quinone diimine) and the cyclic mononuclear model complex, spacer'-C[triple bond]C-Pt(PEt3)2-C[triple bond]C x CuCl (4; spacer' = ortho-diphenyl-2,3,5,6-tetramethyl-1,4-benzoquinone diimine) were synthesized from the 1:1 condensation of the corresponding diethynyl ligands (2-para and 2-ortho (para- and ortho-diethynyl-diphenyl-2,3,5,6-tetramethylquinone diimine), respectively), with the trans-Pt(PBu3)2Cl2 for polymer 3 and cis-Pt(PEt3)2Cl2 for 4. The materials were characterized by GPC, DSC, ATG, and electrochemistry for polymer 3, and by X-ray diffraction for 4. Polymer 3 exhibits a M(n) of 18500, M(w) of 25000 with a PD of 1.37. The trans-geometry about Pt in polymer 3 was confirmed by 31P NMR and IR/Raman spectroscopy. The cyclic voltammogram study on the model complex trans-Pt(PBu3)2(C[triple bond]CPh)2, spacer 1-para (Me3Si-C[triple bond]C-R-C[triple bond]C-SiMe3; R = para-diphenyl-2,3,5,6-tetramethyl-1,4-benzoquinone diimine) and polymer 3 demonstrated that polymer 3 in the presence of trifluoroacetic acid (TFA) exhibits a quasi reversible 2-electron reduction process centered at 0.48 V versus SCE corresponding to the reduction of the protonated quinone diimine unit into the corresponding diamine. The UV-vis spectra of the spacer 2-para (440 nm) and polymer 3 (502 nm) are characterized by red-shifted charge transfer (CT) absorptions (C6H4C[triple bond]C --quinone diimine for 2-para; and (C6H4C[triple bond]C)2Pt --quinone diimine for polymer 3). These assignments are corroborated by density-functional theory (DFT) and time-dependent density-functional theory (TDDFT) computations. Polymer 3 is not luminescent in the solid state or in solution at 77 K and 298 K.

Published
2009
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49. Ladder-like aminopropylsilsesquioxane. A nice alternative for controlled drug delivery

Author

Sébastien Clément, Ahmad Mehdi, Corine Tourné-Péteilh, Guillaume Gracy, Jean-Marie Devoisselle, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and 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)

Subjects
Computer science, General Chemical Engineering, Nanotechnology, [CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Drug delivery, Drug release, 0210 nano-technology, High potential
Abstract

International audience; A simple synthesis of hybrid material with high content (80%) of ibuprofen was reported. The drug release proceeds via a diffusion mechanism and depends on the pH. This extensive system will open new doors to introduce a large variety of drug with high potential for biomedical applications.

Published
2013
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50. Synthesis and characterisation of π-conjugated polymer/silica hybrids containing regioregular ionic polythiophenes

Author

Roberto Lazzaroni, Pascal Gerbaux, Bruno Boury, Simon Desbief, Ahmad Mehdi, Akim Tizit, Sébastien Clément, Julien De Winter, 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), Laboratory for Chemistry of Novel Materials, Université de Mons (UMons), Laboratoire de Chimie Organique, Université de Mons-Hainaut, Chimie moléculaire et organisation du solide (CMOS), and Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS)

Subjects
chemistry.chemical_classification, Condensation polymer, Materials science, Ionic bonding, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, General Chemistry, Polymer, Conjugated system, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Silanol, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Bromide, Polymer chemistry, Materials Chemistry, Polythiophene, 0210 nano-technology, Alkyl
Abstract

International audience; High-regioregular poly{3-[n-(1-methylimidazolium-3-yl)alkyl]thiophene-2,5-diyl bromide} (n = 4, 6, 8) (10-12) have been prepared by reaction of poly[3-(n-bromoalkyl)thiophene-2,5-diyl] (n = 4, 6, 8) (7-9) with 1-methylimidazole. Acid-catalyzed hydrolysis and polycondensation of tetraethoxysilane (TEOS) were carried out in the presence of these polymers. The strong ionic interactions between the imidazolium moieties of the polythiophene and the charged silanol groups enabled the homogeneous dispersion of the polythiophene within silica. The resulting composite materials were characterised by SEM, TEM and tapping mode atomic force microscopy (TM-AFM). The optical and thermal properties were investigated by UV and TGA measurements

Published
2011
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