Dichotomic Aging Behaviour in a Colloidal Glass

Abstract

An unexpected dichotomic long time aging behaviour is observed in a glassy colloidal clay suspension investigated by X-Ray Photon Correlation Spectroscopy and Dynamic Light Scattering. In the long time aging regime the intensity autocorrelations are non-exponential, following the Kohlrausch-Williams-Watts functional form with exponent bQ. We show that for spontaneously aged samples a stretched behaviour (β_Q < 1) is always found. Surprisingly a compressed exponent (β_Q > 1) appears only when the system is rejuvenated by application of a shear field. In both cases the relaxation times scale as Q^{-1}. These observations shed light on the origin of compressed exponential behaviour and helps in classifying previous results in the literature on anomalous dynamics.

arXiv comment5 pages, 5 figures

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• Rheological signatures of a glass-glass transition in an aging colloidal clay
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• Decoupling between thermodynamics and dynamics during rejuvenation in colloidal glasses
• Statistics of Thermal Avalanches in Driven Amorphous Systems