Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1997-07-04
Liquid Crystals 24(3), 427-433 (1998)
Physics
Condensed Matter
Soft Condensed Matter
13 pages, Latex2e, 10 EPS figures, submitted to Liquid Crystals
Scientific paper
Mono-layers of stearic and behenic acids deposited with the Langmuir-Blodgett technique, were used as aligning films in nematic liquid crystal cells. During the filling process the liquid crystal adopts a deformed quasi-planar alignment with splay-bend deformation and preferred orientation along the filling direction. This state is metastable and transforms with time into homeotropic once the flow has ceased. The transition is accompanied by formation of disclination lines which nucleate at the edges of the cell. The lifetime of the metastable splay-bend state was found to depend on the cell thickness. On heating, anchoring transition from quasi-homeotropic to degenerate tilted alignment in form of circular domains takes place near the transition to the isotropic phase. The anchoring transition is reversible with a small hysteresis.
Fazio Valentina S. U.
Komitov Lachezar
Lagerwall Sven T.
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