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Colloidal stability of zwitterionic polymer-grafted gold nanoparticles in water

Céline Durand-Gasselin 1 Regis Koerin 1 Jutta Rieger 2 Nicolas Lequeux 3 Nicolas Sanson 1
2 LCP - Chimie des polymères
UPMC - Université Pierre et Marie Curie - Paris 6, IPCM - Institut Parisien de Chimie Moléculaire, CNRS - Centre National de la Recherche Scientifique : UMR7610
Abstract : We investigate the colloidal stability of gold nanoparticles (AuNPs) coated with zwitterionic sulfobetaine polymers in aqueous solution. Zwitterionic polymers with different molar masses, synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization of N,N'-dimethyl(methacrylamido propyl)ammonium propanesulfonate (SPP) exhibit a well known Upper Critical Solution Temperature (UCST) in water, i.e., phase separate at low temperature. The colloidal stability of gold nanoparticles grafted with PSPP was studied as a function of the temperature. The effects of the molar mass of the grafted polymers, the salt concentration, and the presence of free polymer chains in solution were investigated. UV-vis spectroscopy and dynamic light scattering measurements show that whatever the molar mass of the grafted polymer, the nanoparticles never aggregate at low temperature in pure water. However, a reversible thermal-driven aggregation process of the gold nanoparticles is observed in presence of free polymer chains in solution and explained by a depletion process. (C) 2014 Elsevier Inc. All rights reserved.
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https://hal.sorbonne-universite.fr/hal-01515946
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Submitted on : Friday, April 28, 2017 - 12:18:40 PM
Last modification on : Friday, November 6, 2020 - 11:16:13 AM

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Céline Durand-Gasselin, Regis Koerin, Jutta Rieger, Nicolas Lequeux, Nicolas Sanson. Colloidal stability of zwitterionic polymer-grafted gold nanoparticles in water. Journal of Colloid and Interface Science, Elsevier, 2014, 434, pp.188 - 194. ⟨10.1016/j.jcis.2014.07.048⟩. ⟨hal-01515946⟩

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