Durand-Gasselin Céline, Koerin Régis, Rieger Jutta, Lequeux Nicolas, Sanson Nicolas
Sciences et Ingénierie de la Matière Molle, PSL Research University, ESPCI ParisTech, Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7615, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
Laboratoire de Chimie des Polymères, Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7610, 3 rue Galilée, 94200 Ivry, France.
J Colloid Interface Sci. 2014 Nov 15;434:188-94. doi: 10.1016/j.jcis.2014.07.048. Epub 2014 Aug 14.
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.
我们研究了在水溶液中涂覆有两性离子磺基甜菜碱聚合物的金纳米颗粒（AuNP）的胶体稳定性。通过N，N'-二甲基（甲基丙烯酰胺丙基）丙烷磺酸盐（SPP）的可逆加成-断裂链转移（RAFT）聚合合成的具有不同摩尔质量的两性离子聚合物在水中表现出众所周知的上临界溶液温度（UCST），即在低温下发生相分离。研究了接枝有PSPP的金纳米颗粒的胶体稳定性与温度的关系。研究了接枝聚合物的摩尔质量、盐浓度以及溶液中游离聚合物链的存在的影响。紫外可见光谱和动态光散射测量表明，无论接枝聚合物的摩尔质量如何，纳米颗粒在纯水中低温下从不聚集。然而，在溶液中存在游离聚合物链的情况下，观察到金纳米颗粒的可逆热驱动聚集过程，并通过耗尽过程进行了解释。
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