Coexistence and criticality of fluids with long-range potentials

P J Camp, G N Patey

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)399-408
Number of pages10
JournalThe Journal of Chemical Physics
Volume114
Issue number1
DOIs
Publication statusPublished - 1 Jan 2001

Keywords

  • RESTRICTED PRIMITIVE MODEL
  • IONIC BINARY MIXTURE
  • LENNARD-JONES FLUID
  • MONTE-CARLO
  • PHASE-TRANSITIONS
  • CRITICAL EXPONENTS
  • CRITICAL-POINT
  • CRITICAL-BEHAVIOR
  • CURVE DIAMETER
  • GIBBS ENSEMBLE

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