Surface-induced alignment at model nematic interfaces

摘要: We have applied the generalized van der Waals theory to a model liquid crystal which includes, explicitly, all of second-order terms in spherical harmonic expansion anisotropic intermolecular potential. investigated orientational order induced by each one these terms, as well resulting from competition various included It was shown that, for appropriate choices relative strengths coefficients, is capable accounting qualitatively effects observed at nematic interfaces, including tilted orientations. In particular, different molecular alignments nematic-vapor and nematic-isotropic interfaces given nematogen, were described result competing interactions. Additionally, we that temperature-driven transitions may occur, systems characterized this type interaction. For choice parameters, also found an transition, related wetting transition interface. Finally, it complete isotropic liquid-vapor interface phase be destroyed between Similarly, reentrant found, competition,