Vapour-liquid critical parameters of a $2$:$1$ primitive model of ionic fluids confined in disordered porous media

Abstract

We study the vapour-liquid critical parameters of an ionic fluid confined in a disordered porous medium by using the theory which combines the collective variables approach with an extension of the scaled particle theory. The ionic fluid is described as a two-component charge- and size-asymmetric primitive model, and a porous medium is modelled as a disordered matrix formed by hard-spheres obstacles. In the particular case of the fixed valencies $2$:$1$, the coexistence curves and the corresponding critical parameters are calculated for different matrix porosities as well as for different diameters of matrix and fluid particles. The obtained results show that the general trends of the reduced critical temperature and the reduced critical density with the microscopic characteristics are similar to the trends obtained in the monovalent case. At the same time, it is noticed that an ion charge asymmetry significantly weakens the effect of the matrix presence.

arXiv comment22 pages, 7 figures

References in corpus (6)

• Coexistence and Criticality in Size-Asymmetric Hard-Core Electrolytes
• Statistical field theory for simple fluids: the collective variables representation
• One-dimensional hard rod fluid in a disordered porous medium: scaled particle theory
• What is liquid in random porous media: the Barker-Henderson perturbation theory
• Gas-liquid critical parameters of asymmetric models of ionic fluids
• Vapor-liquid phase behavior of a size-asymmetric model of ionic fluids confined in a disordered matrix: the collective variables-based approach

Cited by in corpus (3)

• Phase Behavior of the Patchy Colloids Confined in the Patchy Porous Media
• Clustering effects on the diffusion of patchy colloids in disordered porous media
• Vapour-liquid phase behaviour of primitive models of ionic liquids confined in disordered porous media