Critical end point behaviour in a binary fluid mixture

Details Critical end point behaviour in a binary fluid mixture Critical end point behaviour in a binary fluid mixture

1997-04-11

arxiv.org/abs/cond-mat/9704099v1

Physics

Condensed Matter

Statistical Mechanics

17 pages Revtex, 11 epsf figures. To appear in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.55.6624

We consider the liquid-gas phase boundary in a binary fluid mixture near its critical end point. Using general scaling arguments we show that the diameter of the liquid-gas coexistence curve exhibits singular behaviour as the critical end point is approached. This prediction is tested by means of extensive Monte-Carlo simulations of a symmetrical Lennard-Jones binary mixture within the grand canonical ensemble. The simulation results show clear evidence for the proposed singularity, as well as confirming a previously predicted singularity in the coexistence chemical potential [Fisher and Upton, Phys. Rev. Lett. 65, 2402 (1990)]. The results suggest that the observed singularities, particularly that in the coexistence diameter, should also be detectable experimentally.

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