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Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities (Articolo in rivista)

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Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities (Articolo in rivista) (literal)

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T. Abete, A. de Candia, E. Del Gado, A. Fierro, A. Coniglio (2008)
Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities
in Physical review. E, Statistical, nonlinear, and soft matter physics (Print); American Physical Society (APS), College Pk (Stati Uniti d'America)
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[T. Abete; A. de Candia; A. Coniglio] Univ Naples Federico 2, Dipartimento Sci Fis, I-80126 Naples, Italy; [T. Abete; A. de Candia] Univ Naples Federico 2, CNISM, I-80126 Naples, Italy; [A. de Candia; A. Coniglio] INFN Udr Napoli, I-80126 Naples, Italy; [E. Del Gado] ETH, Dept Mat, CH-8093 Zurich, Switzerland; [A. Fierro; A. Coniglio] INFM CNR Coherentia, I-80126 Naples, Italy (literal)

Titolo

Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities (literal)

Abstract

We present a systematic study of dynamical heterogeneity in a model for permanent gels upon approaching the gelation threshold. We find that the fluctuations of the self-intermediate scattering function are increasing functions of time, reaching a plateau whose value, at large length scales, coincides with the mean cluster size and diverges at the percolation threshold. Another measure of dynamical heterogeneities-i.e., the fluctuations of the self-overlap-displays instead a peak and decays to zero at long times. The peak, however, also scales as the mean cluster size. Arguments are given for this difference in the long-time behavior. We also find that the non-Gaussian parameter reaches a plateau in the long-time limit. The value of the plateau of the non-Gaussian parameter, which is connected to the fluctuations of diffusivity of clusters, increases with the volume fraction and remains finite at the percolation threshold. (literal)

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