Issue 46, 2014

Role of shear-induced dynamical heterogeneity in the nonlinear rheology of colloidal gels

Abstract

We report the effect of flow-induced dynamical heterogeneity on the nonlinear elastic modulus of weakly aggregated colloidal gels that have undergone yielding by an imposed step strain deformation. The gels are comprised of sterically stabilized poly(methyl methacrylate) colloids interacting through short-ranged depletion attractions. When a step strain of magnitude varying from γ = 0.1 to 80.0 is applied to the quiescent gels, we observe the development of a bimodal distribution in the single-particle van Hove self-correlation function. This distribution is consistent with the existence of a fast and slow subpopulation of colloids within sheared gels. We evaluate the effect of incorporating the properties of the slow, rigid subpopulation of the colloids into a recent mode coupling theory for the nonlinear elasticity of colloidal gels.

Graphical abstract: Role of shear-induced dynamical heterogeneity in the nonlinear rheology of colloidal gels

Supplementary files

Article information

Article type
Paper
Submitted
24 জুন 2014
Accepted
04 অক্টো 2014
First published
17 অক্টো 2014

Soft Matter, 2014,10, 9254-9259

Role of shear-induced dynamical heterogeneity in the nonlinear rheology of colloidal gels

L. C. Hsiao, H. Kang, K. H. Ahn and M. J. Solomon, Soft Matter, 2014, 10, 9254 DOI: 10.1039/C4SM01375A

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