Equilibrium partitioning of a simple fluid in a matrix-filled cylindrical pores with adsorbing walls: A grand canonical Monte Carlo study

We have studied a model of a hard sphere fluid adsorbed in a cylindrical po re filled with quenched disordered matrix of hard sphere particles using Gr and canonical Monte Carlo simulations. The interactions between matrix spec ies and pore walls are assumed of a hard sphere type. However, the pore wal ls exert a short-range attraction upon adsorbed fluid particles. We discuss the adsorption isotherms and the density profiles of fluid particles in po res with different microporosity for several values of the pore radius. We have observed that like in homogeneous microporous media the adsorption inc reases with increasing porosity. However, trends of behavior of the isother ms also reflect layering of adsorbed fluid. The data obtained in this study may serve as a benchmark for the development of the theory of confined que nched-annealed systems and for computes simulation investigation of models permitting phase transitions in pores.