3PA07 液晶フォトニクス : ドナー・アクセプター型アゾベンゼンの光化学反応を利用したネマチック液晶の高速光駆動

概要

論文の詳細を見る
Photochemical phase transition behavior of mixtures of donor-acceptor (D-A) type azobenzene liquid crystals (LCs) and 4-pentyl-4'-cyanobiphenyl (5CB) has been explored. Various kinds of the D-A type azobenzene LCs were prepared. trans-Azobenzene in the mixture stabilizes an LC phase, while cis isomer destabilizes the LC phase. Photoirradiation of very thin film (〜 200 nm) of the mixtures at 405 nm and 436 nm resulted in disappearance of the LC phase due to trans-cis photoisomerization of the azobenzenes, and the LC phase recovered when the irradiated sample was kept in the dark because of cis-trans thermal isomerization and reorientation of the mesogens. The thermal I-LC phase transition rate varied with structures of D and A: the LC phase recovered in 500 ms in a mixture of an azobenzene (with A = -NO_2 and D = -N<) and 5CB at 37℃.
日本液晶学会の論文
1997-09-24