Record Details

Title:
Dichotomic aging behaviour in a colloidal glass
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument MID
Topic:
Scientific area:
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 an exponent $β_{Q}$. 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 help in classifying previous results in the literature on anomalous dynamics
Imprint:
2013
Journal Information:
Soft Matter, 9, 10955–10959 (2013)
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Language(s):
English
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Record created 2017-12-21, last modified 2019-01-30

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