Colloidal stability of zwitterionic polymer-grafted gold nanoparticles in water

被引：22
作者：
Durand-Gasselin, Celine [1 ]
Koerin, Regis [1 ]
Rieger, Jutta [2 ]
Lequeux, Nicolas [3 ]
Sanson, Nicolas [1 ]
机构：
[1] Univ Paris 06, Sorbonne Univ, CNRS UMR 7615, PSL Res Univ,ESPCI ParisTech, F-75231 Paris 05, France
[2] Univ Paris 06, Sorbonne Univ, CNRS UMR 7610, Lab Chim Polymeres, F-94200 Ivry, France
[3] Univ Paris 06, Sorbonne Univ, CNRS UMR 8213, Lab Phys & Etud Mat,PSL Res Univ,ESPCI ParisTech, F-75231 Paris 05, France
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2014年 / 434卷
关键词：
Zwitterion; Nanoparticles; Colloidal stability; Depletion; CRITICAL SOLUTION TEMPERATURE; DEPLETION FLOCCULATION; BLOCK-COPOLYMERS; AQUEOUS-SOLUTION; PHASE-BEHAVIOR; PARTICLES; DISPERSIONS; SIZE;
D O I：
10.1016/j.jcis.2014.07.048
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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收藏
页码：188 / 194
页数：7
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