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Using Monte Carlo simulation, we study the influence of geometric confinementon demixing for a series of symmetric non-additive hard spheres mixturesconfined in slit pores. We consider both a wide range of positivenon-additivities and a series of pore widths, ranging from the pure twodimensional limit to a large pore width where results are close to the bulkthree dimensional case. Critical parameters are extracted by means of finitesize analysis. We find that for this particular case in which demixing isinduced by volume effects, phase separation is in most cases somewhat impededby spatial confinement. However, a non-monotonous dependence of the criticalpressure and density with pore size is found for small non-additivities. Inthis latter case, it turns out that an otherwise stable bulk mixture can beforced to demix by simple geometric confinement when the pore width decreasesdown to approximately one and a half molecular diameters.

Demixing and confinement in slit pores