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Issue 46, 2013
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Dichotomic aging behaviour in a colloidal glass

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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 an exponent βQ. We show that for spontaneously aged samples a stretched behaviour (βQ < 1) is always found. Surprisingly a compressed exponent (βQ > 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 help in classifying previous results in the literature on anomalous dynamics.

Graphical abstract: Dichotomic aging behaviour in a colloidal glass

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Article information

08 May 2013
13 Sep 2013
First published
25 Sep 2013

Soft Matter, 2013,9, 10955-10959
Article type

Dichotomic aging behaviour in a colloidal glass

R. Angelini, L. Zulian, A. Fluerasu, A. Madsen, G. Ruocco and B. Ruzicka, Soft Matter, 2013, 9, 10955
DOI: 10.1039/C3SM52173G

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