Abstract
Abstract A two-dimensional model for a chemically associating fluid adsorbed in a disordered porous media has been investigated. The model is studied by means of the associative Replica Ornstein-Zernike equations, with Perens-Yevick and hypernetted chain approximations, extended for associating fluids. The effects of disordered media density and strength of association interaction on the adsorption isotherms and structural properties of adsorbed fluid are explored. To investigate the effect of association interaction on the liquid-gas phase transition, the additional out-core interparticle interaction in the form of square-well attraction is included. This term is considered in the mean field approximation. It permits us to analyze qualitative trends of the behavior of the critical density and temperature dependence on the combined effect of association and of quenched disorder in the model of dimerizing discs with square-well attraction. Our preliminary conclusion concerning this unexplored problem is that the presence of disorder and of association have opposite effect on the critical temperature. Manipulating the matrix density and bonding between particles may keep almost unaltered the critical temperature.
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