Aging, Yielding, and Shear Banding in Soft Colloidal Glasses

S. A. Rogers, D. Vlassopoulos, and P. T. Callaghan

Phys. Rev. Lett. 100, 128304 – Published 28 March 2008

Abstract

Soft colloidal interactions in colloidal glasses are modeled using suspensions of multiarm star polymers. Using a preshearing protocol that ensures a reproducible initial state (“rejuvenation” of the system), we report here the evolution of the flow curve from monotonically increasing to one dominated by a stress plateau, demonstrating a corresponding shear-banded state. Phenomenological understanding is provided through a scalar model that describes the free-energy landscape.

Received 1 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.128304

Authors & Affiliations

S. A. Rogers¹, D. Vlassopoulos², and P. T. Callaghan^1,*

¹MacDiarmid Institute for Advanced Materials and Nanotechnologies, Victoria University of Wellington, Wellington, New Zealand
²FORTH, Institute of Electronic Structure and Laser, Department of Materials Science and Technology, University of Crete, GR-71110 Heraklion, Crete, Greece

^*Author to whom correspondence should be addressed. paul.callaghan@vuw.ac.nz

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Vol. 100, Iss. 12 — 28 March 2008

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