Structural origins of dynamical heterogeneity in colloidal gels

被引：54

作者：

Dibble, Clare J. ^{[1
]}

Kogan, Michael ^{[1
]}

Solomon, Michael J. ^{[1
]}

机构：

[1] Univ Michigan, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW E | 2008年 / 77卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevE.77.050401

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 show by resolving single-particle dynamics as a function of contact number that dynamical heterogeneity in depletion colloidal gels must have more than one structural origin. Although the magnitude of dynamical heterogeneity of weak gels with cluster structure and strong gels with string structure is similar, the dependence of particle localization on contact number differs significantly in each. The observed transition between contact number dependent and independent dynamics for the weak and strong gels is abrupt. The results suggest that spatially heterogeneous dynamics cannot be a complete explanation of the dynamical heterogeneity of colloidal gels.

引用

页数：4

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