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Proceedings Paper

Photochemical switching between a compensated nematic phase and a twisted nematic phase by photoisomerization of chiral azobenzene molecules
Author(s): Seiji Kurihara; Syugo Nomiyama; Takamasa Nonaka
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Paper Abstract

Three azobenzene compounds with chiral moieties were prepared. A cholesteric phase was induced by mixing each chiral azobenzene in a host nematic liquid crystal. The twisting power of the chiral azobenzene compounds was decreased by ultraviolet irradiation to cause trans - cis photoisomerization of the azobenzene compounds. In addition, a compensated nematic phase was induced by mixing of a chiral azobenzene and a non-photochromic chiral compound having opposite chiral ability to the chiral azobenzene in the host nematic liquid crystal when the twisting powers of both chiral compounds were balanced. The photoisomerization of the chiral azobenzene broke the balanced state in the twisting power, resulting in the transformation of the compensated nematic phase into a cholesteric phase. Effect of the trans-cis photoisomerization on the phase structure of liquid crystals containing the chiral compounds will be discussed.

Paper Details

Date Published: 24 October 2000
PDF: 8 pages
Proc. SPIE 4107, Liquid Crystals IV, (24 October 2000); doi: 10.1117/12.405307
Show Author Affiliations
Seiji Kurihara, Kumamoto Univ. (Japan)
Syugo Nomiyama, Kumamoto Univ. (Japan)
Takamasa Nonaka, Kumamoto Univ. (Japan)

Published in SPIE Proceedings Vol. 4107:
Liquid Crystals IV
Iam-Choon Khoo, Editor(s)

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