Volume 167, 2013

Fluctuations and micro-heterogeneity in mixtures of complex liquids

Abstract

The role of concentration fluctuation and micro-heterogeneity in aqueous methanol mixtures are examined by two different methods: computer simulations of two systems with sizes of 2048 and 16 384 molecules, and site–site Ornstein–Zernike integral equation theory with two different closures. The focus is on the short and long range behaviour of the correlation functions, their running integrals and the structure factors. It is found that the micro-heterogeneous nature of these mixtures does not allow a proper stabilisation of the long range tail of the correlations as obtained through computer simulations, even over 6 ns runs. Similarly, approximate closures provide poor estimates of the concentration fluctuations and micro-structure of the mixtures. Interestingly, the analysis of the inadequacies of both these studies provide interesting insights about the nature and interplay of the concentration fluctuations and the micro-heterogeneity in these mixtures.

Article information

Article type
Paper
Submitted
03 May 2013
Accepted
05 Jun 2013
First published
06 Jun 2013

Faraday Discuss., 2013,167, 145-158

Fluctuations and micro-heterogeneity in mixtures of complex liquids

A. Perera and B. Kežić, Faraday Discuss., 2013, 167, 145 DOI: 10.1039/C3FD00072A

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