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

被引：11

作者：

Maki, Yasuyuki ^{[1
]}

Sugawara, Kentaro ^{[2
]}

Nagai, Daisuke ^{[2
]}

机构：

[1] Kyushu Univ, Grad Sch Sci, Dept Chem, Fukuoka, Fukuoka 8190395, Japan

[2] Gunma Univ, Fac Sci & Technol, Div Mol Sci, Kiryu, Gunma 3768515, Japan

来源：

GELS | 2018年 / 4卷 / 02期

关键词：

microgel; electrophoresis; light scattering; PARTICLES; BEHAVIOR; COLLOIDS;

D O I：

10.3390/gels4020037

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

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 mu and hydrodynamic radius R-h were measured for a slightly ionized poly(N-isopropylacrylamide) (PNIPA) microgel in a dilute suspension. A decrease in R-h was observed in the temperature range between 30 degrees C and 35 degrees C, corresponding to the lower critical solution temperature of PNIPA, and an increase in vertical bar mu vertical bar was observed in a higher temperature range between 34 degrees C and 37 degrees C. The analysis based on electrophoresis theory for spherical polyelectrolytes indicated that the net charge of the microgel decreased as the microgel was deswollen.

引用

页数：9