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 bQ. We show that for spontaneously aged samples a stretched behaviour (bQ < 1) is always found. Surprisingly a compressed exponent (bQ > 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.

Angelini, R., Zulian, L., Fluerasu, A., Madsen, A., Ruocco, G., Ruzicka, B. (2013). Dichotomic aging behaviour in a colloidal glass. SOFT MATTER, 9(46), 10955-10959 [10.1039/c3sm52173g].

Dichotomic aging behaviour in a colloidal glass

ZULIAN, LAURA
Secondo
;
2013

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 bQ. We show that for spontaneously aged samples a stretched behaviour (bQ < 1) is always found. Surprisingly a compressed exponent (bQ > 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.
Articolo in rivista - Articolo scientifico
Soft matter, Laponite, aging, complex systems, gel, glass, phase transition, dynamics, SAXS
English
2013
9
46
10955
10959
none
Angelini, R., Zulian, L., Fluerasu, A., Madsen, A., Ruocco, G., Ruzicka, B. (2013). Dichotomic aging behaviour in a colloidal glass. SOFT MATTER, 9(46), 10955-10959 [10.1039/c3sm52173g].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/66620
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