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Alignment mechanism of nematic liquid crystal on rubbed polymer surface studied by subsequent processes of rubbing and photoalignment

Title
Alignment mechanism of nematic liquid crystal on rubbed polymer surface studied by subsequent processes of rubbing and photoalignment
Authors
Chung D.-H.Takanishi Y.Ishikawa K.Takezoe H.Park B.Jung Y.Hwang H.-K.Lee S.Han K.-J.Jang S.-H.
Ewha Authors
박병주
Issue Date
2000
Journal Title
Japanese Journal of Applied Physics, Part 2: Letters
ISSN
0021-4922JCR Link
Citation
vol. 39, no. 3 A/B, pp. L185 - L187
Publisher
JJAP, Tokyo, Japan
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A novel method for understanding the alignment mechanism was motivated by the texture observation of a nematic liquid crystal (LC) contacted with a photoaligned layer after rubbing. Reorientation of director occurs by subsequent photoalignment to different direction from that forced by rubbing. Moreover, it was found by polarized absorption spectra that the preferential average main chain axis over whole the alignment layer does not change, indicating that the orientation change by photoalignment occurs only at very top surfaces. This experiment without changing surface morphology indicates that the alignment priority for the nematic LC is mainly governed by the anisotropic short-range intermolecular interaction between alignment films and LC molecules and the effect of microgrooves plays a minor role.
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자연과학대학 > 물리학전공 > Journal papers
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