Mode-coupling theory of the stress-tensor autocorrelation function of a dense binary fluid mixture

Details Mode-coupling theory of the stress-tensor autocorrelation function of a dense binary fluid mixture Mode-coupling theory of the stress-tensor autocorrelation function of a dense binary fluid mixture

2005-09-12

arxiv.org/abs/cond-mat/0509282v2

Physical Review A, {\bf 46}, 4942 (1992)

Physics

Condensed Matter

Soft Condensed Matter

Published; withdrawn since ordering in the archive gives misleading impression of new publication

Scientific paper

10.1103/PhysRevA.46.4942

We present a generalized mode-coupling theory for a dense binary fluid mixture. The theory is used to calculate molecular-scale renormalizations to the stress-tensor autocorrelation function (STAF) and to the long-wavelength zero-frequency shear viscosity. As in the case of a dense simple fluid, we find that the STAF appears to decay as $t^{-3/2}$ over an intermediate range of time. The coefficient of this long-time tail is more than two orders of magnitude larger than that obtained from conventional mode-coupling theory. Our study focuses on the effect of compositional disorder on the decay of the STAF in a dense mixture.

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