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By means of a molecular model, we examine hybrid nematic films withantagonistic anchoring angles where one of the surfaces is in the stronganchoring regime. If anchoring at the other surface is weak, and in the absenceof wetting by the isotropic phase, the anchoring transition may interact withthe capillary isotropic-nematic transition in interesting ways. For generalanchoring conditions on this surface we confirm the existence of the step-tilt,biaxial phase and the associated transition to the linear,constant-tilt-rotation, configuration. The step-like phase is connected withthe bulk isotropic phase for increasing film thickness so that the lattertransition is to be interpreted as the capillary isotropic-nematic transition.Finally, we suggest possible global surface phase diagrams.

Capillary and anchoring effects in thin hybrid nematic films and connection with bulk behavior