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

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

2008-06-18

arxiv.org/abs/0806.3034v1

Phys. Rev. E 79, 011712 (2009)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 5 figures

Scientific paper

10.1103/PhysRevE.79.011712

By means of a molecular model, we examine hybrid nematic films with antagonistic anchoring angles where one of the surfaces is in the strong anchoring regime. If anchoring at the other surface is weak, and in the absence of wetting by the isotropic phase, the anchoring transition may interact with the capillary isotropic-nematic transition in interesting ways. For general anchoring 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 with the bulk isotropic phase for increasing film thickness so that the latter transition is to be interpreted as the capillary isotropic-nematic transition. Finally, we suggest possible global surface phase diagrams.

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