Report
Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities
| العنوان: | Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities |
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| المؤلفون: | Abete, T., de Candia, A., Del Gado, E., Fierro, A., Coniglio, A. |
| المصدر: | Phys. Rev. E, 78, 041404 (2008) |
| سنة النشر: | 2008 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Soft Condensed Matter, Condensed Matter - Statistical Mechanics |
| الوصف: | 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 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 percolation threshold. Comment: 11 pages, 14 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevE.78.041404 |
| URL الوصول: | http://arxiv.org/abs/0811.0945 |
| رقم الانضمام: | edsarx.0811.0945 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevE.78.041404 |
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