Segregation in aqueous methanol enhanced by cooling and compression

Details Segregation in aqueous methanol enhanced by cooling and compression Segregation in aqueous methanol enhanced by cooling and compression

2004-12-16

arxiv.org/abs/cond-mat/0412439v1

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 8 figs, submitted to J. Chem. Phys

Scientific paper

10.1063/1.1888405

Molecular segregation in methanol-water mixtures is studied across a wide concentration range as a function of temperature and pressure. Cluster distributions obtained from both neutron diffraction and molecular dynamics simulations point to significantly enhanced segregation as the mixtures are cooled or compressed. This evolution toward greater molecular heterogenity in the mixture accounts for the observed changes in the water-water radial distribution function and there are indications also of a change in the topology of the water clusters. The observed behavior is consistent with an approach to an upper critical solution point. Such a point would appear to be ``hidden'' below the freezing line, thereby precluding observation of the two-fluid region.

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