Relationship between rheology and structure of interpenetrating, deforming and compressing microgels

被引：94

作者：

Conley, Gaurasundar M. ^{[1
]}

Zhang, Chi ^{[1
]}

Aebischer, Philippe ^{[1
]}

Harden, James L. ^{[2
]}

Scheffold, Frank ^{[1
]}

机构：

[1] Univ Fribourg, Dept Phys, Chemin Musee 3, CH-1700 Fribourg, Switzerland

[2] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

基金：

加拿大自然科学与工程研究理事会; 瑞士国家科学基金会;

关键词：

CROSS-LINK DENSITY; PHASE-BEHAVIOR; SUSPENSIONS; ELASTICITY; PARTICLES; MODEL; TRANSITIONS; MICROSCOPY; STORM; GLASS;

D O I：

10.1038/s41467-019-10181-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Thermosensitive microgels are widely studied hybrid systems combining properties of polymers and colloidal particles in a unique way. Due to their complex morphology, their interactions and packing, and consequentially the viscoelasticity of suspensions made from microgels, are still not fully understood, in particular under dense packing conditions. Here we study the frequency-dependent linear viscoelastic properties of dense suspensions of micron sized soft particles in conjunction with an analysis of the local particle structure and morphology based on superresolution microscopy. By identifying the dominating mechanisms that control the elastic and dissipative response, we can explain the rheology of these widely studied soft particle assemblies from the onset of elasticity deep into the overpacked regime. Interestingly, our results suggest that the friction between the microgels is reduced due to lubrification mediated by the polymer brush-like corona before the onset of interpenetration.

引用

页数：8

共 65 条

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