Temporal heterogeneity of the slow dynamics of a colloidal paste

We investigate the slow dynamics of a soft glass, a concentrated suspension of polydisperse colloidal particles, by using multispeckle Diffusing Wave Spectroscopy (DWS). Two distinct regimes are observed: for small sample age, tw, the dynamics smoothly slows down, as revealed by a nearly linear incr...

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Bibliographic Details
Published inSlow Dynamics in Complex Systems Vol. 708; pp. 68 - 71
Main Authors Ballesta, Pierre, Ligoure, Christian, Cipelletti, Luca
Format Journal Article
LanguageEnglish
Published 30.04.2004
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Summary:We investigate the slow dynamics of a soft glass, a concentrated suspension of polydisperse colloidal particles, by using multispeckle Diffusing Wave Spectroscopy (DWS). Two distinct regimes are observed: for small sample age, tw, the dynamics smoothly slows down, as revealed by a nearly linear increase of the characteristic relaxation time, s, measured by DWS. At longer ages, the dynamics is quasi stationary, but s exhibit anomalously large fluctuations in time. The time scale of the dynamical fluctuations is found to be slightly shorter than the average relaxation time. The variance of the intensity correlation function is maximum for time delays comparable to the average relaxation time, in striking analogy with recent simulations of glass-forming liquids.
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ISBN:9780735403840
0735403848
ISSN:0094-243X
DOI:10.1063/1.1764063