Coexistence and criticality of fluids with long-range potentials

被引:49
作者
Camp, PJ
Patey, GN
机构
[1] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada
[2] Univ Edinburgh, Dept Chem, Edinburgh EH9 3JJ, Midlothian, Scotland
关键词
D O I
10.1063/1.1329134
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Using mixed-field finite-size scaling simulations, we have investigated the liquid-vapor critical behavior of three-dimensional fluids;vith algebraically decaying attractive pair interactions, which vary like -1/r(3+sigma) with sigma = 3, 1, and 0.1. The finite-size scaling analysis was carried out by matching the critical ordering operator distribution, p(L)(x), against the limiting Ising form, i.e., Ising criticality was assumed. When the potential is short-ranged (sigma = 3) the simulation results are entirely consistent with the expected Ising critical behavior. When the potential is long-ranged (sigma = 1, 0.1), however, marked deviations from Ising behavior are observed, particularly in the form of the critical ordering operator distribution, and in the estimated values of beta/nu. The results are consistent with non-Ising criticality which is predicted theoretically in fluid with long-range interactions. Some results from Gibbs ensemble simulations are also provided in order to sketch the shape of the liquid-vapor coexistence envelope. We discuss the relevance of our results to the current issue of criticality in ionic fluids. (C) 2001 American Institute of Physics.
引用
收藏
页码:399 / 408
页数:10
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