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18 results on '"DIpartimento di Scienza dei Materiali e Ingegneria Chimica"'

1. Photopolymerization of maleimide perfluoropolyalkylethers without a photoinitiator

Author

Roberta Maria Bongiovanni, Christine Joly-Duhamel, Julia Burgess, Céline Bonneaud, Chadron M. Friesen, 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), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, and Politecnico di Torino = Polytechnic of Turin (Polito)

Subjects
maleimides, omniphobicity, perfluoropolyalkylethers, photopolymerization, Polymers and Plastics, Organic Chemistry, Materials Chemistry, 2506, Metals and Alloys, Chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, [CHIM.POLY]Chemical Sciences/Polymers, Photopolymer, 0210 nano-technology, Maleimide, Photoinitiator, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018
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2. Controlling perfluoropolyalkylether rearrangements at the surface of photocured networks

Author

Melania Rizzello, Alessandra Vitale, Chadron M. Friesen, Giuseppe Trusiano, Roberta Maria Bongiovanni, Christine Joly-Duhamel, Céline Bonneaud, Politecnico di Torino = Polytechnic of Turin (Polito), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, 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 Western University, and Department of Chemistry

Subjects
Materials science, Polymers and Plastics, Surface rearrangements, Perfluoropolyalkylethers, UV-curing, Wettability control, Hydrophobic polymers, General Physics and Astronomy, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, chemistry.chemical_compound, Coating, Materials Chemistry, Copolymer, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, Comonomer, Organic Chemistry, Polymer, Epoxy, 021001 nanoscience & nanotechnology, Surface energy, 0104 chemical sciences, chemistry, Chemical engineering, Free surface, visual_art, engineering, visual_art.visual_art_medium, 0210 nano-technology, Surface reconstruction
Abstract

Perfluoropolyalkylether (PFPAE) reactive macromers can be used in very low concentration (≤2 wt%) as efficient surface modifying agents of epoxy resins to obtain hydrophobic photocured copolymers. However, the hydrophobicity achieved thanks to the spontaneous migration of the PFPAE chains to the free surface could be dramatically lost due to environmentally induced rearrangements of the fluorinated segments, even though they are chemically bonded to the polymer matrix. To preserve the coating performances of the photocured copolymers when exposed to various environments, different approaches have been investigated. In particular, to hinder the mobility of the fluorinated chains, the length of the fluorinated comonomer chain, the epoxy matrix stiffness, and the functional PFPAE end-groups have been tuned. Such strategies are demonstrated to inhibit or completely suppress the surface reconstruction of the copolymers when exposed to different surrounding environments (e.g., immersion in water or oil), allowing to obtain photocured films with a long-term and constant reduced surface energy of ≈20 mN/m.

Published
2019
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3. Emulsion Polymerization of Dihydroeugenol-, Eugenol-, and Isoeugenol-Derived Methacrylates

Author

Samantha Molina-Gutiérrez, Sylvain Caillol, Roberta Maria Bongiovanni, Vincent Ladmiral, Patrick Lacroix-Desmazes, 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), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, and Politecnico di Torino = Polytechnic of Turin (Polito)

Subjects
General Chemical Engineering, Radical polymerization, Emulsion polymerization, 02 engineering and technology, Methacrylate, Industrial and Manufacturing Engineering, chemistry.chemical_compound, biobased polymer, 020401 chemical engineering, Organic chemistry, 0204 chemical engineering, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, emulsion, Depolymerization, latex, General Chemistry, Polymer, 021001 nanoscience & nanotechnology, Isoeugenol, Monomer, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Emulsion, 0210 nano-technology, eugenol
Abstract

The use of biobased monomers in emulsion polymerization arises as an attractive option for the synthesis of green polymers. Eugenol, a naturally occurring phenol that is currently mainly produced from clove oil but could also be obtained by depolymerization of lignin, is an interesting molecule for the preparation of biobased monomers and polymers. Readily polymerizable functional groups can be easily introduced into its chemical structure through modification of the phenol group. In the present work, eugenol-based methacrylates have been used as monomers in emulsion radical polymerization with different initiation systems. Stable latexes of poly(ethoxy dihydroeugenyl methacrylate), poly(ethoxy eugenyl methacrylate) and poly(ethoxy isoeugenyl methacrylate) with particle diameter size in the 45–71 nm range were successfully obtained. Glass transition temperatures of the resulting polymers ranged between 20 and 72 °C. This study opens the way to the use of these new biobased monomers into latexes formulatio...

Published
2019
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4. Understanding the Host/Guest Interactions in Iodine/Hofmann-Type Clathrate Ni(pz)[Ni(CN)4] System

Author

Sabine Devautour-Vinot, Barbara Onida, Christian Guérin, Agnès Grandjean, Guillaume Maurin, Yannick Guari, Joulia Larionova, Giovanni Massasso, Jérôme Long, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), 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), and Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Infrared, Chemistry, Inorganic chemistry, Monte Carlo method, Clathrate hydrate, Ionic bonding, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Iodine, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, symbols.namesake, General Energy, Adsorption, symbols, Electrical measurements, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, 0210 nano-technology, Raman spectroscopy, ComputingMilieux_MISCELLANEOUS
Abstract

The I2 adsorption in Ni(pz)[Ni(CN)4] clathrate was investigated by combining spectroscopic and computational tools, including electrical measurements, solid UV–vis, infrared, and Raman spectroscopy, and Monte Carlo simulations. We observed that while ionic I3– species are formed at low I2 concentration, iodine in its molecular form is present at higher concentration. The appearance of polyiodides was suggested to result from the interactions between the guest and the [Ni(CN)4]2– moieties of the host framework.

Published
2015
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5. Molecular iodine adsorption within Hofmann-type structures M(L)[M′(CN)4] (M = Ni, Co; M′ = Ni, Pd, Pt): impact of their composition

Author

Sabine Devautour-Vinot, Guillaume Maurin, Jérôme Long, Bruno Donnadieu, Giovanni Massasso, Barbara Onida, Christian Guérin, María Rodríguez-Castillo, Joulia Larionova, Agnès Grandjean, Yannick Guari, Julien Haines, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), 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), and Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Pyrazine, Chemistry, Metal ions in aqueous solution, Clathrate hydrate, Inorganic chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Ion, Metal, Inorganic Chemistry, chemistry.chemical_compound, Crystallography, Adsorption, Octahedron, visual_art, visual_art.visual_art_medium, [CHIM]Chemical Sciences, Thermal stability, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

A series of thermally stable Hofmann-type clathrate structures with the general formula M(pz)[M'(CN)4], where M and M' are bivalent metal ions M(II) = Ni(II), Co(II), M(II)' = Ni(II), Pd(II), Pt(II), and pz is the pyrazine bidentate ligand, was synthesized and investigated for the efficient entrapment of iodine (I2) in solution and in the gas phase. Iodine-containing clathrates thus prepared were analysed to determine the saturation capacity, thermal stability, guest-induced structural changes of the clathrate's lattice and the nature of the confined iodine according to the chemical composition of the host structure. An efficient confinement of about 1 I2 per unit cell is observed for the series of clathrates with the Ni(II) and Pd(II) ions in the square planar position whatever the bivalent metal ion in the octahedral position. Specific responses in the lattice adjustment are detected for Co(II) in the octahedral and Pd(II) in the square planar positions.

Published
2015
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6. Nanocomposites based on Hofmann-type structure Ni(II)(pz)[Ni(CN)4] (pz = pyrazine) nanoparticles for reversible iodine capture

Author

Joulia Larionova, Christian Guérin, Giovanni Massasso, Agnès Grandjean, Barbara Onida, Jérôme Long, Yannick Guari, María Rodríguez-Castillo, 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 de Chimie Séparative de Marcoule (ICSM - UMR 5257), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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
Cyclohexane, Pyrazine, Renewable Energy, Sustainability and the Environment, Inorganic chemistry, Infrared spectroscopy, Sorption, 02 engineering and technology, General Chemistry, Mesoporous silica, Porous glass, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Polymer chemistry, X-ray crystallography, General Materials Science, [CHIM.COOR]Chemical Sciences/Coordination chemistry, 0210 nano-technology, Energy source, ComputingMilieux_MISCELLANEOUS
Abstract

Hybrid nanocomposites based on nanoparticles with the Hofmann-type structure NiII(pz)[NiII(CN)4] (where pz = pyrazine) confined into mesoporous silica or porous glass pearls were synthesised by sequential coordination of the molecular precursors into the pores of the functionalized matrices. Infrared (IR) and UV/Visible (UV-Vis) spectroscopy, powder X-ray diffraction (PXRD), and transmission electron microscopy (TEM) reveal the presence of uniformly-sized spherical NiII(pz)[NiII(CN)4] nanoparticles of 3–6 nm, which are homogeneously dispersed into the matrices. These nanocomposites are able to efficiently capture iodine from cyclohexane solutions with a maximum sorption capacity of 1.75 mmol per g of material. A particular emphasis is given on the mechanism of iodine sorption as well as on the sorption cycling ability of the materials.

Published
2015
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7. Surface modification of porous silicon microparticles by sonochemistry

Author

Stéphanie Pace, Francesco Geobaldo, Beniamino Sciacca, 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)-Centre National de la Recherche Scientifique (CNRS), Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), DIpartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), 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, General Chemical Engineering, technology, industry, and agriculture, 02 engineering and technology, General Chemistry, equipment and supplies, 010402 general chemistry, 021001 nanoscience & nanotechnology, Porous silicon, 01 natural sciences, 0104 chemical sciences, Sonochemistry, Chemical engineering, [CHIM]Chemical Sciences, Organic chemistry, Surface modification, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Uv treatment
Abstract

Ultrasound is employed to functionalize the surface of porous silicon microparticles at room temperature with unsaturated organic compounds, with no need for heating or for UV treatment.

Published
2013
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8. Determination of the pyroelectric coefficient within pyroelectric materials by using space charge measurements

Author

Alain Toureille, Jerome Castellon, C. Vanga Bouanga, L. Banet, Serge Agnel, Michel Frechette, Giulio Malucelli, Institut d’Electronique et des Systèmes (IES), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Groupe d'économie mondiale (GEM), Sciences Po (Sciences Po), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), Institut de Recherche d'Hydro-Québec [Varennes] (IREQ), Groupe énergie et matériaux (GEM), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Materials science, Analytical chemistry, Time constant, 02 engineering and technology, Dielectric, 021001 nanoscience & nanotechnology, Thermal diffusivity, 01 natural sciences, Space charge, [SPI.TRON]Engineering Sciences [physics]/Electronics, law.invention, Characterization (materials science), Pyroelectricity, Capacitor, law, 0103 physical sciences, Equivalent circuit, Composite material, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

In this paper, a new theory allowed calculating the pyroelectric coefficient “p” using the diffusion of a thermal wave within materials having a pyroelectric effect. The demonstration is performed on materials composed by various percentages of a cycloaliphatic epoxy (CE) resin and of a flexibilizing comonomer (1,6-hexanediol diglycidyl ether — HDGE). By using an electric field measurement technique (the Thermal Step Method — TSM), the signal obtained on these materials (a current) presents an atypical form, which requires the modification of the theoretical model of the TSM. Indeed, the theory of the TSM technique has been initially developed for insulating materials with a high dielectric time constant. An adaptation of the technique is thus necessary to analyze the behavior of materials, which present a modification of their molecular structure during the application of the thermal wave. During a space charge characterization performed on these materials, we have observed an atypical shape for the thermal step currents. To help in the interpretation, the broadband dielectric spectroscopy and the Differential Scanning Calorimetry technique (DSC) were used to obtain additional information. Considering these results, a circuit containing a resistor and a capacitor in series has been used for modeling the materials. This equivalent circuit constitutes the beginning of the new theory, which is developed in this paper. The pyroelectric coefficient generated by the thermal step diffusion, due to the presence of a pyroelectric effect of these studied materials, has been calculated using the detailed model.

Published
2012
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9. Dielectric study of low glass transition temperature cycloaliphatic UV-curable epoxy networks

Author

Jerome Castellon, H. Couderc, Alain Toureille, L. Banet, Michel Frechette, Giulio Malucelli, C. V. Bouanga, Sylvio Savoie, Giovanni Camino, Institut d’Electronique et des Systèmes (IES), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Groupe énergie et matériaux (GEM), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche d'Hydro-Québec [Varennes] (IREQ), Laboratoire d'Ingénierie des Matériaux de Bretagne (LIMATB), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université de Brest (UBO), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, and Politecnico di Torino = Polytechnic of Turin (Polito)

Subjects
Permittivity, Diglycidyl ether, Materials science, epoxy networks, Dielectric relaxation, 02 engineering and technology, Dielectric, 01 natural sciences, chemistry.chemical_compound, 0103 physical sciences, Polymer chemistry, glass transition temperature, Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Comonomer, UV-curing, crosslinking density, Epoxy, 021001 nanoscience & nanotechnology, Space charge, [SPI.TRON]Engineering Sciences [physics]/Electronics, chemistry, Chemical engineering, visual_art, visual_art.visual_art_medium, Polymer blend, 0210 nano-technology, Glass transition
Abstract

This work focuses on the dielectric properties of a UV-cured epoxy network with a low glass transition temperature obtained through photoinduced copolymerization of a cycloaliphatic diepoxy monomer, 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexanecarboxylate (CE), with 1,6-hexanediol diglycidyl ether (HDGE). The crosslinking density of the system has been tuned using different amounts of the low glass transition temperature HDGE comonomer (up to 60 wt.% HDGE). The structural morphology and space charge obtained with the Thermal Step Method were studied following various thermal treatments of the samples. Both the thermal properties and the dielectric responses (dielectric constant) for the UV-cured HDGE/CE systems turned out to be dependent on the structural morphology and composition of the polymer network. In particular, two relaxation modes, γ, β and α were observed, attributed to local molecular motions. Lastly, the potential effect of moisture and/or ions and the effect of space charge on the copolymers were also investigated.

Published
2012
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10. Switching of fluorescence mediated by a peroxynitrite–glutathione redox reaction in a porous silicon nanoreactor

Author

Stephanie Pace, Beniamino Sciacca, Francesco Geobaldo, Paola Rivolo, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-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)-Institut de Chimie du CNRS (INC), DIpartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), and Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Silicon, Spectrophotometry, Infrared, porous Silicon, functionalisation, Biosensor, fluorescence, General Physics and Astronomy, 02 engineering and technology, Nanoreactor, 010402 general chemistry, Photochemistry, Porous silicon, 01 natural sciences, Redox, chemistry.chemical_compound, Dichlorofluorescein, Peroxynitrous Acid, Physical and Theoretical Chemistry, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, Reactive oxygen species, Chemistry, technology, industry, and agriculture, Glutathione, equipment and supplies, 021001 nanoscience & nanotechnology, Fluoresceins, 0104 chemical sciences, Nanostructures, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], 0210 nano-technology, Reactive Oxygen Species, Oxidation-Reduction, Porosity, Peroxynitrite
Abstract

A nanostructured porous silicon chip functionalized with dichlorofluorescein is employed as a nanoreactor to respond to Reactive Oxygen Species (ROS) and to real-time studying redox reactions.

Published
2012
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11. Layer by layer assemblies on polycarbonate : a dielectric study

Author

Carosio, F., Malucelli, G., Camino, G., Castellon, J., Banet, L., Agnel, S., Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), Dipartimento di Scienza Applicata e Technologia, Institut d’Electronique et des Systèmes (IES), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Groupe énergie et matériaux (GEM), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Eric, Dauverchain

Subjects
[SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience

Published
2012

12. Nano-structured Tapes for Electro technical High-power Insulating Applications: The Sol-gel route

Author

Banet, L., Camino, G., Castellon, J., Couderc, H., Dreuilles, N., Eggenschwiler, H., Frechette, M., Fugier, P., Gao, F., Malucelli, G., Nigmatullin, R., Plyhm, T., Preda, I., Reading, M. D., Savoie, S., Schubert, C., Simon, H., Thompson, S., Vaessen, A.-F., Vanga-Bouanga, C., Vaughan, A. S., Institut d’Electronique et des Systèmes (IES), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Scienza Applicata e Technologia, Politecnico di Torino = Polytechnic of Turin (Polito), Groupe énergie et matériaux (GEM), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Ingénierie des Matériaux de Bretagne (LIMATB), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université de Brest (UBO), Institut de Recherche d'Hydro-Québec [Varennes] (IREQ), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, School of Science and Technology [Nottingham, U.K.], Nottingham Trent University, Chemnitz University of Technology / Technische Universität Chemnitz, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Laboratoire de Physico -& Toxico Chimie des systèmes naturels (LPTC), and Université Sciences et Technologies - Bordeaux 1-Centre National de la Recherche Scientifique (CNRS)

Subjects
ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience

Published
2012

13. Fast optical vapour sensing by Bloch surface waves on porous siliconmembranes

Author

Fabrizio Giorgis, Lorenzo Dominici, Emiliano Descrovi, Francesco Geobaldo, Beniamino Sciacca, Francesco Michelotti, Marzia Quaglio, Dipartimento di Energetica, Universita di Roma - La Sapienza, Université de Rome, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Istituto Italiano di Tecnologia (IIT), DIpartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), and Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Silicon, Physics::Instrumentation and Detectors, Physics::Optics, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, Substrate (electronics), Porous silicon, 01 natural sciences, 010309 optics, Optics, Etching (microfabrication), 0103 physical sciences, Physical and Theoretical Chemistry, ComputingMilieux_MISCELLANEOUS, Photonic crystal, Total internal reflection, business.industry, 021001 nanoscience & nanotechnology, chemistry, Surface wave, Attenuated total reflection, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], 0210 nano-technology, business
Abstract

The coupling of optical Bloch surface waves at the truncated end of one dimensional porous silicon photonic crystals is exploited for fast vapour sensing. Self-standing multilayered membranes bound to transparent substrates were fabricated by electrochemical etching and used in an attenuated total reflection configuration to resonantly excite the surface waves and perform real-time sensing.

Published
2010
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14. Bioconjugate functionalization of thermally carbonized porous silicon using a radical coupling reaction

Author

Beniamino Sciacca, Sara D. Alvarez, Francesco Geobaldo, Michael J. Sailor, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), DIpartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), Department of Chemistry and Biochemistry, University of California [San Diego] (UC San Diego), University of California (UC)-University of California (UC), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), and University of California-University of California

Subjects
Silicon, Materials science, Sebacic acid, Surface Properties, Carboxylic acid, Inorganic chemistry, chemistry.chemical_element, Biosensing Techniques, 02 engineering and technology, 010402 general chemistry, Porous silicon, 01 natural sciences, Article, Inorganic Chemistry, chemistry.chemical_compound, Spectroscopy, Fourier Transform Infrared, Electrochemistry, medicine, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, Temperature, technology, industry, and agriculture, Chemical modification, equipment and supplies, 021001 nanoscience & nanotechnology, Carbon, 0104 chemical sciences, Dicarboxylic acid, Chemical engineering, chemistry, Undecylenic acid, Surface modification, 0210 nano-technology, Porosity, medicine.drug
Abstract

The high stability of Salonen's thermally carbonized porous silicon (TCPSi) has attracted attention for environmental and biochemical sensing applications, where corrosion-induced zero point drift of porous silicon-based sensor elements has historically been a significant problem. Prepared by the high temperature reaction of porous silicon with acetylene gas, the stability of this silicon carbide-like material also poses a challenge--many sensor applications require a functionalized surface, and the low reactivity of TCPSi has limited the ability to chemically modify its surface. This work presents a simple reaction to modify the surface of TCPSi with an alkyl carboxylate. The method involves radical coupling of a dicarboxylic acid (sebacic acid) to the TCPSi surface using a benzoyl peroxide initiator. The grafted carboxylic acid species provides a route for bioconjugate chemical modification, demonstrated in this work by coupling propylamine to the surface carboxylic acid group through the intermediacy of pentafluorophenol and 1-ethyl-3-[3-dimethylaminopropyl]carbodiimide hydrochloride (EDC). The stability of the carbonized porous Si surface, both before and after chemical modification, is tested in phosphate buffered saline solution and found to be superior to either hydrosilylated (with undecylenic acid) or thermally oxidized porous Si surfaces.

Published
2010
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15. Catalysis by acids and bases: New materials and surface studies

Author

Didier Tichit, Guido Busca, Barbara Onida, Angelo Vaccari, Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), 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
Stereochemistry, Chemistry, New materials, 02 engineering and technology, General Chemistry, [CHIM.CATA]Chemical Sciences/Catalysis, 010402 general chemistry, 01 natural sciences, Catalysis, 0104 chemical sciences, 020401 chemical engineering, Organic chemistry, 0204 chemical engineering, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010
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16. Doubly resonant porous silicon microcavities for enhanced detection of fluorescent organic molecules

Author

Beniamino Sciacca, Alberto Venturello, Fabrizio Giorgis, Francesca Frascella, Paola Rivolo, Emiliano Descrovi, Francesco Geobaldo, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), DIpartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)

Subjects
Materials science, Orders of magnitude (temperature), Physics::Optics, Nanotechnology, 02 engineering and technology, 010402 general chemistry, Porous silicon, 01 natural sciences, Resonator, Materials Chemistry, Molecule, Electrical and Electronic Engineering, Instrumentation, ComputingMilieux_MISCELLANEOUS, business.industry, Metals and Alloys, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Fluorescence, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, Photonics, 0210 nano-technology, business, Biosensor, Excitation
Abstract

The synthesis of porous silicon-based photonic structures for bio-sensing applications has been widely investigated in the last years. Thanks to its spongiform structure, porous silicon can efficiently host many organic molecules dispersed in solutions having proper chemical affinity. Fluorescent emission of organic-dyes embedded in porous silicon can be enhanced if a photonic structure like a Fabry–Perot resonator is employed as a host solid matrix. In this work we present experimental evidence of a fluorescence enhancement effect obtained by means of doubly resonant microcavities tuned on both the excitation and the emission wavelengths. The use of doubly resonant cavities allows both a resonant excitation of dyes and a resonant amplification of the emission. We demonstrate that small concentrations of fluorescent dyes down to few picomoles can be detected. The bio-sensing capabilities of such a structure are tested on larger molecules of fluorescein-labelled protein A, yielding to an evident lowering of the detection limit by 2 orders of magnitude.

Published
2009
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17. Coupling of surface waves in highly defined one-dimensional porous silicon photonic crystals for gas sensing applications

Author

Francesco Geobaldo, Beniamino Sciacca, Francesco Michelotti, Emiliano Descrovi, Francesca Frascella, Lorenzo Dominici, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), DIpartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino = Polytechnic of Turin (Polito), Istituto Italiano di Tecnologia (IIT), Dipartimento di Energetica, Universita di Roma - La Sapienza, Université de Rome, and Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Physics and Astronomy (miscellaneous), Silicon, business.industry, Surface plasmon, Physics::Optics, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Porous silicon, 01 natural sciences, Electromagnetic radiation, 010309 optics, Optics, chemistry, Surface wave, 0103 physical sciences, Reflection (physics), [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Photonics, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS, Photonic crystal
Abstract

We describe the use of one-dimensional porous silicon (p-Si) photonic crystals for guiding TE-polarized surface electromagnetic waves (SEWs). Although bulk and interface roughnesses might deteriorate the optical response of photonic structures, we observed reflection spectra presenting narrow (≲6nm) reflectivity anomalies associated with SEWs. In analogy with surface plasmons, SEWs are strongly sensitive to surface modifications. As a proof of principle for a sensor, we provide a direct real-time monitoring of the reversible interactions of organic vapors with the p-Si multilayer. We highlight the higher sensitivity of the SEW-based detection scheme as compared to a method exploiting perturbations of waveguide modes.

Published
2007
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18. Synthesis of poly[oligo(hexafluoropropylene oxide) perfluoroisopropenylether (PIPE)] graft copolymers with vinylidene fluoride (VDF) using CF 3 radicals

Author

Trevor J. Burgess, Chadron M. Friesen, Abdelatif Manseri, Alessandra Vitale, Taizo Ono, Christine Joly-Duhamel, Bruno Ameduri, Roberta Maria Bongiovanni, Politecnico di Torino = Polytechnic of Turin (Polito), 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), Dipartimento di Scienza dei Materiali e Ingegneria Chimica, National Institute of Advanced Industrial Science and Technology (AIST), Trinity Western University, Department of Chemistry, and RISE

Subjects
Polymers and Plastics, fluoropolymer, Bioengineering, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Biochemistry, Contact angle, chemistry.chemical_compound, hexafluoropropylene oxide, Polymer chemistry, Copolymer, radical copolymerization, ComputingMilieux_MISCELLANEOUS, Molar mass, Comonomer, vinylidene fluoride, Organic Chemistry, thermal properties, Hexafluoropropylene oxide, 021001 nanoscience & nanotechnology, Macromonomer, 0104 chemical sciences, 19 F-NMR spectroscopy, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, perfluoroisopropenyl ethers, graft copolymers, 0210 nano-technology, Glass transition, Fluoride
Abstract

The synthesis of poly(vinylidene fluoride)-graft-oligomeric hexafluoropropylene oxide graft copolymers [poly[VDF-g-oligo(HFPO)-PIPE] is presented, where VDF, HFPO, and PIPE stand for vinylidene fluoride (CH2CF2), hexafluoropropylene oxide (CF3CFCF2O) and, perfluoroisopropenylether (–OC(CF3)CF2), respectively. First, an 82% isolated yield of oligo(HFPO)-PIPE macromonomer was achieved by using oligo(HFPO) primary iodide as the starting reagent. Then, the radical copolymerization of VDF with the PIPE comonomer, initiated by perfluoro-3-ethyl-2,4-dimethyl-3-pentyl persistent radical (PPFR), was studied under various conditions. The PPFR initiator, stable at room temperature, was able to release a ˙CF3 radical starting from 80 °C. The resulting poly[VDF-g-oligo(HFPO)-PIPE] graft copolymers were produced in good isolated yields (76 to 97%). The molar percentages and molar masses of such graft copolymers were assessed by 19F-NMR spectroscopy using the CF3– end-group label. The molar percentages of VDF and oligo(HFPO)-PIPE comonomers reached up to 99% and 20%, respectively, while the molar masses ranged between 7500 and 42 600 g mol−1. Their thermal properties showed: (i) fair to satisfactory thermostability (T5%d) showing up to 271 °C under nitrogen, (ii) glass transition (Tg) ranged from −81 to −82 °C while (iii) their melting temperature (Tm) ranged between 150 and 163 °C. Moreover, the synthesized copolymers were demonstrated to be highly omniphobic (i.e., simultaneously hydrophobic and oleophobic), showing a water contact angle of ca. 133°, a hexadecane contact angle ca. 70°, and a surface energy as low as 12 mN m−1.

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