Dipolar origin of the gas-liquid coexistence of the hard-core 1:1 electrolyte model

J. M. Romero-Enrique, L. F. Rull, Athanassios Z. Panagiotopoulos

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Abstract

We present a systematic study of the effect of the ion pairing on the gas-liquid phase transition of hard-core 1:1 electrolyte models. We study a class of dipolar dimer models that depend on a parameter [formula presented] the maximum separation between the ions that compose the dimer. This parameter can vary from [formula presented] that corresponds to the tightly tethered dipolar dimer model to [formula presented] that corresponds to the Stillinger-Lovett description of the free ion system. The coexistence curve and critical point parameters are obtained as a function of [formula presented] by grand-canonical Monte Carlo techniques. Our results show that this dependence is smooth but nonmonotonic and converges asymptotically towards the free ion case for relatively small values of [formula presented] This fact allows us to describe the gas-liquid transition in the free ion model as a transition between two dimerized fluid phases. The role of the unpaired ions can be considered as a perturbation of this picture.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume66
Issue number4
DOIs
StatePublished - Oct 9 2002

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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