Effects of particle softness on shear thickening of microgel suspensions

被引：26

作者：

Zhou, Zhi ^{[1
,2
]}

Hollingsworth, Javoris V. ^{[1
]}

Hong, Song ^{[3
]}

Wei, Guangmin ^{[1
]}

Shi, Yu ^{[1
]}

Lu, Xi ^{[1
]}

Cheng, He ^{[4
,5
]}

Han, Charles C. ^{[1
]}

机构：

[1] Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Joint Lab Polymer Sci & Mat, Beijing Natl Lab Mol Sci,Inst Chem, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Beijing Univ Chem Technol, Anal & Test Ctr, Beijing 10029, Peoples R China

[4] Chinese Acad Sci, IHEP, CSNS, Dongguan 523803, Peoples R China

[5] DINS, Dongguan 523808, Peoples R China

来源：

SOFT MATTER | 2014年 / 10卷 / 33期

基金：

美国国家科学基金会;

关键词：

ANGLE NEUTRON-SCATTERING; CORE-SHELL LATEX; VOLUME-PHASE-TRANSITION; FLOW-INDUCED STRUCTURE; COLLOIDAL DISPERSIONS; DENSE SUSPENSIONS; BROWNIAN SUSPENSIONS; X-RAY; RHEOLOGY; TEMPERATURE;

D O I：

10.1039/c4sm01181c

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：

A series of microgel particles composed of a polystyrene (PS) core and a thermo-sensitive poly(N-isopropylacrylamide) (PNIPAM) shell with different shell thicknesses were investigated to elucidate the effect of microgel softness on its shear thickening behavior. Since the softness of the microgels increases with decreasing temperature through the volume phase transition effect of PNIPAM shell, the measured softness parameter, n, which is derived from the Zwanzig-Mountain equation, was used to measure and describe the combined influences of temperature and shell thickness. Confocal microscopy is used to investigate the interaction potential between microgel particles with different softness parameters. According to the obtained results, the softness parameter can provide an estimate for the shear thickening behavior of microgel suspensions, at least semi-quantitatively.

引用

页码：6286 / 6293

页数：8

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