Homogeneous Alignment of a Nematic Liquid Crystal by a Pyrolyzed Polyimide Langmuir-Blodgett Film

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Abstract
The pyrolyzed polyimide Langmuir-Blodgett film can provide an aligning layer and an electrode for liquid crystal cells. The LB film surface is characterized by Scanning electron microscopy, scanning tunneling microscopy and optical absorption spectra. We find that the aligning and conducting mechanism is due to the presence of carbon enriched islands in the LB film. The electrooptical effects in twisted nematic liquid crystal cells using the films as electrodes and aligning layers are observed.