Universal self-diffusion and subdiffusion in colloids at freezing

Indrani, A. V. ; Ramaswamy, Sriram (1994) Universal self-diffusion and subdiffusion in colloids at freezing Physical Review Letters, 73 (2). pp. 360-363. ISSN 0031-9007

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Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.73.360

Related URL: http://dx.doi.org/10.1103/PhysRevLett.73.360

Abstract

We provide a theoretical explanation for the observed quasiuniversality of the ratio of the long-time to short-time self-diffusion coefficients in the colloidal liquids at freezing. We also predict that the mean-squared displacement at freezing, plotted against a suitably renormalized time, yields a universal curve showing a short-time subdiffusive regime and a long-time caged diffusion. We obtain Cs(k,t), the intermediate scattering function, for all (k,t) and show that it implies strong non-Gaussian behavior in the probablity distribution of the single-particle displacement at short times.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
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