Scaling of dynamics with the range of interaction in short-range attractive colloids.
We numerically study the dependence of the dynamics on the range of interaction Delta for the short-range square well potential. We find that, for small 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 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.
Foffi
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Dipartimento di Fisica and INFM, Università di Roma La Sapienza, P.le A. Moro 2, 00185 Roma, Italy. giuseppe.foffi@epfl.ch
De Michele
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Sciortino
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Tartaglia
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