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 Thg6 2014
Accepted
04 Thg10 2014
First published
17 Thg10 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements