On the structure of bilayer condensed phases confined between crystalline walls of triangular symmetry

Grand canonical ensemble Monte Carlo simulation method is used to study the structure of Lennard-Jones fluids confined between the parallel walls, formed by the (111) planes of the face centered cubic crystal. Thin slit pores with a width allowing for the formation of only two atomic layers are considered. It is shown that the structure of confined solidlike phases is very sensitive to the pore width, the misfit between the size of adsorbate atoms and the size of surface lattice, as well as the corrugation of the surface potential. In particular, when the misfit between the adsorbate atoms and the surface lattice is very small, even a weakly corrugated surface potential highly stabilizes solidlike phases of triangular symmetry. On the other hand, in the case of large misfit the packing effects become a dominating factor and lead to the appearance of solidlike phases of different structures and symmetries.