Tunable attractive and repulsive interactions between pH-responsive microgels

被引：44

作者：

Cho, Jae Kyu ^{[1
]}

Meng, Zhiyong ^{[2
]}

Lyon, L. Andrew ^{[2
]}

Breedveld, Victor ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Petit Inst Bioengn & Biosci, Sch Chem & Biochem, Atlanta, GA 30332 USA

来源：

SOFT MATTER | 2009年 / 5卷 / 19期

基金：

美国国家科学基金会;

关键词：

COLLOIDAL CRYSTALS; PHASE-BEHAVIOR; SUSPENSIONS; FORCES; PARTICLES; DIAGRAM; SPHERES; SOFT;

D O I：

10.1039/b912105f

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 report direct measurements of the pairwise interparticle potential between poly(N-isopropylacrylamide-co-acrylic acid) (pNIP Am-co-AAc) colloidal microgels as a function of pH, as determined through Ornstein-Zernike analysis of the pair distribution function of quasi-2D dilute colloidal suspensions. The interaction potential ranges from purely repulsive at high pH due to electrosteric interactions to weakly attractive at low pH due to hydrogen bonding, which explains previous observations on the unique phase behavior of these particles in concentrated suspensions.

引用

页码：3599 / 3602

页数：4

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