The gas-liquid coexistence region of a primitive model electrolyte in the mean electrostatic potential approach

Using the modified Poisson-Boltzmann (MPB) and symmetric Poisson- Boltzmann (SPB) theories we have obtained the coexistence curve and related transition properties of a primitive model (PM) electrolyte. For the restricted PM case fairly good agreement is found between the MPB and recent Monte Carlo results. A broadening of the coexistence region and a displacement of the critical point are the suggested consequences of considering size asymmetric electrolytes. In the vicinity of the critical point examined here the MPB and SPB theories display a mean-field value for the associated critical exponent β. © 1994 Taylor %26 Francis Ltd.

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