Anchoring transitions in nematic-discotic lyotropic mesophase under magnetic field

Abstract

Magneto-morphologic and orientational properties of the lyotropic nematic-discotic N-D mesophase have been studied by the polarizing optical microscopy technique. Texture transformations from the schlieren texture to the homeotropic alignment and from the homeotropic alignment to the planar alignment have been investigated. Occurrence of these alignments has been studied by the optical and conoscopic/orthoscopic observations. The changes of the angle between the director and a normal to the surface of the sandwich-cell, and the optical birefringence under magnetic field vs. time have been determined.