Alignment of nematic liquid crystals on mixed Langmuir-Blodgett mono-layers
Abstract
Mono-layers of stearic and behenic acids and mixtures of them in different proportions, deposited with the Langmuir-Blodgett technique, were used to study the alignment and the alignment dynamics in nematic liquid crystal cells. A relaxation process from a splay-bend flow induced metastable orientation to the homeotropic one occurs. The lifetime of the metastable state was found to depend on the mono-layer composition. The transition between the homeotropic and the conical anchoring was found to be irreversible in the case of the mixed aligning mono-layers: on cooling from the isotropic phase a quasi-planar nematic state (schlieren texture) appears. It is stable in a range of a few degrees below the clearing point and, on decreasing the temperature, relaxes to the homeotropic state in form of expanding domains.
Keywords
Cite
@article{arxiv.cond-mat/9709180,
title = {Alignment of nematic liquid crystals on mixed Langmuir-Blodgett mono-layers},
author = {V. S. U. Fazio and L. Komitov and S. T. Lagerwall},
journal= {arXiv preprint arXiv:cond-mat/9709180},
year = {2009}
}
Comments
9 pages, LaTeX2e article, 8 figures, 11 EPS files, submitted to Thin Solid Films