Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-10-06
Physics
Condensed Matter
Soft Condensed Matter
date de la fin de redaction : 06/09/2004
Scientific paper
10.1117/12.546342
We use Time Resolved Correlation (TRC), a recently introduced light scattering method, to study the dynamics of a variety of jammed, or glassy, soft materials. The output of a TRC experiment is cI(t,tau), the time series of the degree of correlation between the speckle patterns generated by the light scattered at time t and t+tau. We characterize the fluctuations of cI by calculating their Probability Density Function, their variance as a function of the lag tau, and their time autocorrelation function. The comparison between these quantities for a Brownian sample and for jammed materials indicate unambiguously that the slow dynamics measured in soft glasses is temporally heterogeneous. The analogies with recent experimental, numerical and theoretical work on temporal heterogeneity in the glassy dynamics are briefly discussed.
Ballesta Pierre
Bissig Hugo
Cipelletti Luca
Duri Agnes
Trappe Veronique
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