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Communication dans un congrès

Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics

Abstract : 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 c(I)(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 c(I) 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 glassy dynamics are briefly discussed.
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Communication dans un congrès
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https://hal.inrae.fr/hal-02761614
Déposant : Migration Prodinra <>
Soumis le : jeudi 4 juin 2020 - 05:50:10
Dernière modification le : mercredi 14 octobre 2020 - 04:10:47

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Agnès Duri, Hugo Bissig, Véronique Trappe, Pierre Ballesta, Luca Cipelletti. Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics. Conference on Fluctuations and Noise in Materials, National High Magnetic Field Laboratory. Floride, USA., May 2004, Maspaloma, Spain. ⟨10.1117/12.546342⟩. ⟨hal-02761614⟩

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