Capillary condensation of a fluid in a slit-like pore filled with obstacles: Lattice Monte Carlo simulation

We study the capillary condensation of a lattice gas with nearest neighbor attraction confined to a slit-like pore filled with frozen obstacles (matri x). First, the lattice Monte Carlo simulations were performed for a slit-li ke pore without obstacles. Next, the pore filled with obstacles, i.e., conf ined microporous medium, is prepared by adsorbing and then by quenching a h ard sphere fluid in the pore of the width H. The model includes fluid-wall attraction; however, the fluid-matrix interaction is entirely repulsive. We have investigated how concentration of obstacles and the pore width H infl uence the capillary phase diagrams. Our numerical experiments reveal essent ial changes in the critical temperature and in the shape of the coexistence line with the amount of quenched obstacles.