Theory of activated-rate processes under shear with application to shear-induced aggregation of colloids

被引：119

作者：

Zaccone, Alessio ^{[1
]}

Wu, Hua ^{[1
]}

Gentili, Daniele ^{[1
]}

Morbidelli, Massimo ^{[1
]}

机构：

[1] ETH, Dept Chem & Appl Biosci, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW E | 2009年 / 80卷 / 05期

关键词：

aggregation; colloids; diffusion; proteins; rheology; thixotropy; viscosity; PARTICLES; MECHANISM; MOTION; FLUID;

D O I：

10.1103/PhysRevE.80.051404

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：

Using an approximation scheme within the convective diffusion (two-body Smoluchowski) equation framework, we unveil the shear-driven aggregation mechanism at the origin of structure formation in sheared colloidal systems. The theory, verified against numerics and experiments, explains the induction time followed by explosive (irreversible) rise of viscosity observed in charge-stabilized colloidal and protein systems under steady shear. The Arrhenius-type equation with shear derived here, extending Kramers' theory in the presence of shear, clearly demonstrates the important role of shear drive in activated-rate processes as they are encountered in soft condensed matter.

引用

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