Local composition fluctuations in strongly nonideal binary mixtures

Murarka, Rajesh K and Bagchi, Biman (2002) Local composition fluctuations in strongly nonideal binary mixtures. In: Journal of Chemical Physics, 117 (3). pp. 1155-1165.

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Abstract

We study the static and dynamical aspects of small length scale composition fluctuations in strongly nonideal binary mixtures of two different type by isothermal–isobaric (NPT) ensemble molecular dynamics simulations. Both the two models studied consider strong attractive interaction between dissimilar species which discourage the phase seperation in the binary mixtures. We find that the joint probability distribution of the composition fluctuations within molecular sized volumes is nearly Gaussian. However, the distributions are rather broad in both the binary mixtures. This is to be contrasted with the density fluctuation which is nearly negligible. Spontaneous fluctuation in one component is found to be anticorrelated with the fluctuations in it's counterpart. The investigation of the dynamical correlation functions of the fluctuations reveal nonexponential relaxation with a slow long time tail. The cross-correlation function relaxes at a slower rate than the two pure correlations.

Item Type:	Journal Article
Publication:	Journal of Chemical Physics
Publisher:	American Institute of Physics
Additional Information:	Copyright for this article belongs to American Institute of Physics (AIP).
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	17 Nov 2004
Last Modified:	19 Sep 2010 04:16
URI:	http://eprints.iisc.ac.in/id/eprint/1985

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