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Adv Mater. 2013 Jun 25;25(24):3365-70. doi: 10.1002/adma.201300730. Epub 2013 May 13.

In situ homeotropic alignment of nematic liquid crystals based on photoisomerization of azo-dye, physical adsorption of aggregates, and consequent topographical modification.

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  • 1Department of BIN Fusion Technology, Chonbuk National University, Jeonju, 561-756, Korea.


In situ homeotropic alignment is achieved by photochromic trans- to cis-isomerization of an azo-dye doped in a nematic host. The augmented dipole moment of the cis-isomer formed under UV-irradiation expedites molecular assembly into crystalline aggregates. Subsequent deposition of the aggregates creates a roughened surface and induces an anchoring transition from the initial planar to a homeotropic alignment of the LCs.

Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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