Size-asymmetric primitive model at low temperature: Description of ion pairing and location of the critical point

Weimin Zhou, Jerome K. Percus

Research output: Contribution to journalArticlepeer-review

Abstract

We argue that Bjerrum's approach to ion pairing is inappropriate for the size-asymmetric primitive model in the neighborhood of its critical point, and propose a new approach based on the Stillinger-Lovett pairing procedure. The new approach recursively scales up the ion size until linear approximations are suitable for analyzing such a model. To locate the critical point, a residual van der Waals interaction between pairs is added, with an energy cutoff adjusted to match the critical temperature of the restricted primitive model. The locations and downward trends of Tc and ρc with asymmetry are found to compare favorably with simulations.

Original languageEnglish (US)
Article number235701
JournalPhysical Review Letters
Volume95
Issue number23
DOIs
StatePublished - Dec 2 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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