Heterogeneous diffusion in a reversible gel

Details Heterogeneous diffusion in a reversible gel Heterogeneous diffusion in a reversible gel

2006-12-20

arxiv.org/abs/cond-mat/0612513v2

Phys. Rev. Lett. 98, 135503 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

We introduce a microscopically realistic model of a physical gel and use computer simulations to study 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 determined by geometric percolation, 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. The gel dynamics is highly heterogeneous and we propose a theoretical model to quantitatively describe dynamic heterogeneity in gels. We elucidate several differences between the dynamics of gels and that of glass-formers.

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