Phase behaviour of a symmetrical binary fluid mixture in a field

Details Phase behaviour of a symmetrical binary fluid mixture in a field Phase behaviour of a symmetrical binary fluid mixture in a field

2006-02-10

arxiv.org/abs/cond-mat/0602259v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 2 figures

Scientific paper

10.1209/epl/i2006-10087-7

Integral equation theory calculations within the mean spherical approximation (MSA) and grand canonical Monte Carlo (MC) simulations are employed to study the phase behaviour of a symmetrical binary fluid mixture in the presence of a field arising from unequal chemical potentials of the two particle species. Attention is focused on the case for which, in the absence of a field, the phase diagram exhibits a first order liquid-liquid transition in addition to the liquid-vapor transition. We find that in the presence of a field, two possible subtypes of phase behaviour can occur, these being distinguished by the relationship between the critical lines in the full phase diagram of temperature, density, and concentration. We present the detailed form of the respective phase diagrams as calculated from MSA and compare with results from the MC simulations, finding good overall agreement.

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