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Scaling of Dynamics with the Range of Interaction in Short-Range Attractive Colloids

2005; American Physical Society; Volume: 94; Issue: 7 Linguagem: Inglês

10.1103/physrevlett.94.078301

1092-0145

Giuseppe Foffi, Cristiano De Michele, Francesco Sciortino, P. Tartaglia,

Phase Equilibria and Thermodynamics

We numerically study the dependence of the dynamics on the range of interaction $\ensuremath{\Delta}$ for the short-range square well potential. We find that, for small $\ensuremath{\Delta}$, dynamics scale exactly in the same way as thermodynamics, both for Newtonian and Brownian microscopic dynamics. For interaction ranges from a few percent down to the Baxter limit, the relative location of the attractive-glass line and the liquid-gas line does not depend on $\ensuremath{\Delta}$. This proves that, in this class of potentials, disordered arrested states (gels) can be generated only as a result of a kinetically arrested phase separation.