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Accession number;99A0938079
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| Title;Memory Effect of Liquid Crystal Surface Alignment. |
| Author;
XUAN L
(Tohoku Univ.)
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Journal Title;Record of Electrical and Communication Engineering Conversazione, Tohoku University
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Journal Code:F0511A
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ISSN:0385-7719
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VOL.68;NO.1;PAGE.55-58(1999)
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| Figure&Table&Reference;FIG.5, REF.2 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;This paper describes memory effect of liquid crystal surface alignment. This effect is considered to be caused by the surface adsorption and desorption of liquid crystal on polymer surface. In the experiment, a sandwich cell with a nematic liquid crystal doped with a cholesteric liquid crystal was used. After removal of an electric field parallel to the surface, liquid crystal molecule rotates by the effect of twisting power competing with the effect of the surface adsorption of liquid crystal molecules. In order to explain this dynamical process we have proposed an adsorption-desorption model. In terms of this point of view, the rotational speed of the director of the adsorpted molecule is determined by the adsorption energy and angle .DELTA..PHI. between director of adsorbed molecule and that of the closest molecular layer. Then we measured the alignment rotation speed by experiment and .DELTA..PHI. by analysis of the distribution of the order parameters according to Mean Field Theory. Finally 0.9eV of the adsorption energy was obtained. (author abst.) |
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