| 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.
for LaTeX users @article{TAbete2008-78,
author = {T. Abete and A. de Candia and E. Del Gado and A. Fierro and A. Coniglio},
title = {Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities},
journal = {Phys. Rev. E},
volume = {78},
pages = {041404},
year = {2008}
}
\bibitem{TAbete2008-78} T. Abete, A. de Candia, E. Del Gado, A. Fierro, A. Coniglio,
Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities,
Phys. Rev. E {\bf 78} (2008) 041404.TAbete2008-78
T. Abete, A. de Candia, E. Del Gado, A. Fierro, A. Coniglio
Dynamical heterogeneity in a model for permanent gels: Different behavior of dynamical susceptibilities
Phys. Rev. E,78,2008,041404 |
mk@mat.ethz.ch
1 out of 816 entries requested
[H-factor to-date: > 0]
