Journal
SOFT MATTER
Volume 9, Issue 46, Pages 10955-10959Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3sm52173g
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Funding
- DOE (NSLS-II project) [EAC02-98CH10886]
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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 beta(Q). We show that for spontaneously aged samples a stretched behaviour (beta(Q) < 1) is always found. Surprisingly a compressed exponent (beta(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 help in classifying previous results in the literature on anomalous dynamics.
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