Journal of Colloid and Interface Science 516 (2018) 153–161 Contents lists available at ScienceDirect Journal of Colloid and Interface Science journal homepage: www.elsevier.com/locate/jcis Regular Article Effect of ionic strength and salt identity on poly(N-isopropylacrylamide) brush modiﬁed colloidal silica particles Ben A. Humphreys, Erica J. Wanless, Grant B. Webber Priority Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia graphical a bstract article i nfo abstract Article history: Hypothesis: The thermoresponse of poly(N-isopropylacrylamide) stabilised particles is inﬂuenced by the Received 30 October 2017 presence of salt and is dependent on the concentration, and ions present. The conformation and elec- Revised 14 January 2018 trophoretic mobility of core/shell PNIPAM brush modiﬁed silica particles is expected to vary as a function Accepted 15 January 2018 of these speciﬁc ion effects. Available online 31 January 2018 Experiments: The thermoresponse of PNIPAM brush modiﬁed silica particles was investigated via dynamic light scattering and electrophoretic mobility measurements between 5 and 45 C in the pres- Keywords: ence of 11 different salt solutions. Colloidal silica Findings: Speciﬁc ion effects were observed in the presence of salt solutions for concentrations between Core/shell 50 and 1000 mM. The temperature response could be
Journal of Colloid and Interface Science – Elsevier
Published: Apr 15, 2018
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