Aging after shear rejuvenation in a soft glassy colloidal suspension: evidence for two different regimes

Abstract

The aging dynamics after shear rejuvenation in a glassy, charged clay suspension have been investigated through dynamic light scattering (DLS). Two different aging regimes are observed: one is attained if the sample is rejuvenated before its gelation and one after the rejuvenation of the gelled sample. In the first regime, the application of shear fully rejuvenates the sample, as the system dynamics soon after shear cessation follow the same aging evolution characteristic of normal aging. In the second regime, aging proceeds very fast after shear rejuvenation, and classical DLS cannot be used. An original protocol to measure an ensemble averaged intensity correlation function is proposed and its consistency with classical DLS is verified. The fast aging dynamics of rejuvenated gelled samples exhibit a power law dependence of the slow relaxation time on the waiting time.

arXiv comment7 pages, 6 figures

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• Delayed Yielding in Creep, Time - Stress Superposition and Effective Time Theory for a Soft Glass
• Aging behavior of the localization length in a colloidal glass
• Ageing under stress and mechanical fragility of soft solids of laponite
• Rheological Behavior of Colloidal Silica Dispersion: Irreversible Aging and Thixotropy
• Ageing under oscillatory stress: Role of energy barrier distribution in thixotropic materials
• Aging of the Nonlinear Optical Susceptibility of colloidal solutions