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Elaboration d'Agrégats Minéraux Nanométriques Linéaires
à l'aide de Polymères Thermosensibles

Abstract : This study deals with the fine-tuning of the interactions between silica nanoparticles and thermoresponsive polymers in order to build permanent rigid linear aggregates. Three polymers were used: poly(vinylpyrrolidone) (PVP), poly(ethylene oxide) (PEO), and poly(Nisopropylacrylamide)
(PNIPAM). These polymers are thermoresponsive, they become hydrophobic and collapse above (e.g. PEO and PNIPAM) or below (e.g. PVP) a critical temperature. The collapse of the polymer chains at the surface of the silica particles generates an attractive potential that can overcome the repulsive electrostatic forces between the silica particles under certain circumstances. The combined use of the thermoresponsiveness of these polymers and the chemistry of silica enables us to build permanent rigid aggregates. Small linear aggregates
are obtained when the electrostatic surface potential (pH=8.5) is high and the initial ionic strength is low (I~10-3 M). Larger aggregates have a fractal dimension of 1.5. These aggregates have been characterised using two complementary techniques: transmission electron microscopy and small angle neutron scattering.
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Submitted on : Saturday, July 8, 2006 - 6:11:08 PM
Last modification on : Thursday, December 16, 2021 - 3:58:27 AM
Long-term archiving on: : Monday, April 5, 2010 - 11:57:21 PM


  • HAL Id : tel-00084633, version 1


David Babayan. Elaboration d'Agrégats Minéraux Nanométriques Linéaires
à l'aide de Polymères Thermosensibles. Matériaux. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨NNT : ⟩. ⟨tel-00084633⟩



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