Two-step yielding and directional strain-induced strengthening in dilute colloidal gels

被引：73

作者：

Chan, Hubert K. ^{[1
]}

Mohraz, Ali ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92717 USA

来源：

PHYSICAL REVIEW E | 2012年 / 85卷 / 04期

基金：

美国国家科学基金会;

关键词：

RHEOLOGY; BEHAVIOR; AGGREGATION; ATTRACTION; STABILITY;

D O I：

10.1103/PhysRevE.85.041403

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We investigate the nonlinear rheology of dilute, depletion-induced colloidal gels and report that these systems yield via a two-step process. We propose the two yield points to be associated with interparticle bond rotation and bond breakage, respectively. These distinct yielding mechanisms lead to remarkable creep profiles at intermediate values of the applied stress, highlighted by an anisotropic shear-induced strengthening and flow arrest at very large accumulated strains (gamma similar to 80). The possible microstructural origins of this behavior are discussed.

引用

页数：6

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