Electrical noise properties in aging materials

Abstract : The electric thermal noise has been measured in two aging materials, a colloidal suspension (Laponite) and a polymer (polycarbonate), presenting very slow relaxation towards equilibrium. The measurements have been performed during the transition from a fluid-like to a solid-like state for the gel and after a quench for the polymer. For both materials we have observed that the electric noise is characterized by a strong intermittency, which induces a large violation of the Fluctuation Dissipation Theorem (FDT) during the aging time, and may persist for several hours at low frequency. The statistics of these intermittent signals and their dependance on the quench speed for the polymer or on sample concentration for the gel are studied. The results are in a qualitative agreement with recent models of aging, that predict an intermittent dynamics.
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Communication dans un congrès
D. Popovic, M.B. Weissman, Z. Racz. Fluctuations and Noise, May 2004, Maspalomas, Spain. SPIE, pp.150-164, 2004, Proceedings of SPIE vol. 5469. 〈10.1117/12.545381〉
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Contributeur : Ludovic Bellon <>
Soumis le : jeudi 4 octobre 2007 - 15:46:08
Dernière modification le : lundi 3 décembre 2018 - 11:14:06

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Lionel Buisson, Matteo Ciccotti, Ludovic Bellon, Sergio Ciliberto. Electrical noise properties in aging materials. D. Popovic, M.B. Weissman, Z. Racz. Fluctuations and Noise, May 2004, Maspalomas, Spain. SPIE, pp.150-164, 2004, Proceedings of SPIE vol. 5469. 〈10.1117/12.545381〉. 〈ensl-00176792〉

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