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Open AccessArticle

Temperature Dependence of Electrophoretic Mobility and Hydrodynamic Radius of Microgels of Poly(N-isopropylacrylamide)

Department of Chemistry, Graduate School of Science, Kyushu University, Fukuoka 819-0395, Japan
Division of Molecular Science, Faculty of Science and Technology, Gunma University, Kiryu 376-8515, Japan
Author to whom correspondence should be addressed.
Received: 7 March 2018 / Revised: 16 April 2018 / Accepted: 19 April 2018 / Published: 20 April 2018
Electrostatic interactions in charged microgels, which are dominated by the microgel net charge, play a crucial role in colloidal stabilization and loading of small, charged molecules. In this study, the temperature dependences of electrophoretic mobility μ and hydrodynamic radius Rh were measured for a slightly ionized poly(N-isopropylacrylamide) (PNIPA) microgel in a dilute suspension. A decrease in Rh was observed in the temperature range between 30 °C and 35 °C, corresponding to the lower critical solution temperature of PNIPA, and an increase in |μ| was observed in a higher temperature range between 34 °C and 37 °C. The analysis based on electrophoresis theory for spherical polyelectrolytes indicated that the net charge of the microgel decreased as the microgel was deswollen. View Full-Text
Keywords: microgel; electrophoresis; light scattering microgel; electrophoresis; light scattering
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MDPI and ACS Style

Maki, Y.; Sugawara, K.; Nagai, D. Temperature Dependence of Electrophoretic Mobility and Hydrodynamic Radius of Microgels of Poly(N-isopropylacrylamide). Gels 2018, 4, 37.

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