Electric field dependence of phase equilibria of binary Stockmayer fluid mixtures

András Gábor, István Szalai

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Abstract

A perturbation theory based study of the effect of an external electric field on the phase equilibrium properties of binary Stockmayer fluids is presented. The dipole-dipole interaction and the applied field are treated as independent perturbations to a Lennard-Jones mixture, and the reference fluid is treated by the van der Waals one-fluid approximation. A third-order free energy expression in the electric field strength is established, and the dielectric constant is calculated for a needle-shaped sample parallel to the field direction. We present and discuss vapour-liquid and liquid-liquid equilibrium curves at a given temperature for some dipolar mixtures exposed to an electric field, including chlorodifluoromethane difluoromethane and acetonitrile methanol. A sufficiently high electric field may result in massive shifts of vapour pressures and critical or azeotropic points, and can considerably alter the properties of coexisting phases. The vapour pressure decreases with increasing field strength.

Original languageEnglish
Pages (from-to)1094-1106
Number of pages13
JournalMolecular Physics
Volume106
Issue number8
DOIs
Publication statusPublished - Apr 1 2008

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Keywords

  • Fluid-fluid equilibria
  • Perturbation theory
  • Stockmayer mixture

ASJC Scopus subject areas

  • Biophysics
  • Molecular Biology
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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