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Ion association in model ionic fluids

TitleIon association in model ionic fluids
Publication TypeJournal Article
Year of Publication1999
AuthorsCamp, PJ, Patey, GN
JournalPhysical Review E
Volume60
Pagination1063-1066
Date PublishedJul
Type of ArticleArticle
ISBN Number1063-651X
KeywordsBEHAVIOR, CHARGED, COULOMB GAS, CRITICALITY, CROSSOVER, HARD-SPHERE, LIQUID-VAPOR COEXISTENCE, MONTE-CARLO, PHASE-TRANSITION, RESTRICTED PRIMITIVE MODEL, SIMULATION
Abstract

Monte Carlo simulations are used to investigate the temperature and pressure (density) dependence of ion association in the restricted primitive model. It is shown that at temperatures below the critical temperature T-c the vapor consists almost exclusively of strongly bound ion pairs at or near contact. Significant ion-pair dissociation begins at temperatures very near T-c. This raises the possibility that compositional fluctuations between strongly bound and free lions influence the critical behavior. We note qualitative similarities between the present results and the Kosterlitz-Thouless transition in the two-dimensional Coulomb gas. [S1063-651X(99)03107-4].

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