Static and dynamic properties of a reversible gel

Details Static and dynamic properties of a reversible gel Static and dynamic properties of a reversible gel

2008-11-10

arxiv.org/abs/0811.1447v1

AIP Conf. Proc. 1091, 166 (2009)

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 7 figures, paper presented at the 10th Granada Seminar on Computational and Statistical Physics

Scientific paper

10.1063/1.3082276

We study a microscopically realistic model of a physical gel and use computer simulations to investigate its static and dynamic properties at thermal equilibrium. The phase diagram comprises a sol phase, a coexistence region ending at a critical point, a gelation line, and an equilibrium gel phase unrelated to phase separation. The global structure of the gel is homogeneous, but the stress is supported by a fractal network. Gelation results in a dramatic slowing down of the dynamics, which can be used to locate the transition, which otherwise shows no structural signatures. Moreover, the equilibrium gel dynamics is highly heterogeneous as a result of the presence of particle families with different mobilities. An analysis of gel dynamics in terms of mobile and arrested particles allows us to elucidate several differences between the dynamics of equilibrium gels and that of glass-formers.

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