0000000000684905

AUTHOR

Laurent David

showing 2 related works from this author

Inelastic Light Scattering Contribution to the Study of the Onset of Sintering of a Nanopowder

2017

International audience; The onset of the sintering of 5 nm ZrO2 and TiO2 nanoparticles is investigated by various methods including inelastic light scattering. A special attention is paid to low-frequency Raman spectra where scattering from confined acoustic vibrations and quasielastic scattering manifest. Significant changes are observed between samples sintered at different temperatures or applied forces. A detailed analysis of the spectra enables to follow the variation of the size of the nanoparticles, the surface area, and the formation of internanoparticles necks in the sintered materials. Finally, low-frequency scattering is shown to be more sensitive to the onset of sintering than m…

Materials scienceSinteringNanoparticle02 engineering and technology010402 general chemistry01 natural sciencesLight scatteringSpectral linesymbols.namesakeOpticsCondensed Matter::SuperconductivityPhysics::Chemical PhysicsPhysical and Theoretical ChemistryComputingMilieux_MISCELLANEOUSQuasielastic scatteringCondensed matter physicsScatteringbusiness.industry[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnology0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic Materials[ CHIM.POLY ] Chemical Sciences/PolymersGeneral Energy[CHIM.POLY]Chemical Sciences/Polymers[ CHIM.MATE ] Chemical Sciences/Material chemistrysymbolsExperimental methods0210 nano-technologybusinessRaman spectroscopy
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Functional Bionanocomposite Fibers of Chitosan Filled with Cellulose Nanofibers Obtained by Gel Spinning

2021

Extremely high mechanical performance spun bionanocomposite fibers of chitosan (CHI), and cellulose nanofibers (CNFs) were successfully achieved by gel spinning of CHI aqueous viscous formulations filled with CNFs. The microstructural characterization of the fibers by X-ray diffraction revealed the crystallization of the CHI polymer chains into anhydrous chitosan allomorph. The spinning process combining acidic–basic–neutralization–stretching–drying steps allowed obtaining CHI/CNF composite fibers of high crystallinity, with enhanced effect at incorporating the CNFs. Chitosan crystallization seems to be promoted by the presence of cellulose nanofibers, serving as nucleation sites for the gr…

polymer fiber yarnsMaterials sciencePolymers and PlasticsComposite numberOrganic chemistrymechanical propertiesArticlelaw.inventionChitosanchemistry.chemical_compoundCrystallinityQD241-441lawFiberComposite materialCrystallizationCellulosecellulose nanofiberschemistry.chemical_classificationGeneral ChemistryPolymerchemistrybio-nanocompositesgel/wet spinningNanofiberchitosanPolymers
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