Molecular mechanism of anomalous increase in the helical pitch of cholesteric liquid crystals induced by achiral dopants

Masatoshi Kidowaki, Masaya Moriyama, Momoyo Wada, Nobuyuki Tamaoki

研究成果: Article

26 引用 (Scopus)

抜粋

A dopant-induced anomalous increase in the helical pitch of dicholesteryl 10,12-docosadiynedioate 1 is explained by generation of smectic clusters in the cholesteric phase where the dopants act as promoters of smectic domains. The dopants, having a mesogenic core and the proper length of alkyl chains on both their molecular sides, such as 4,4′-dialkylazobenzenes, 4,4′-dialkylazoxybenzenes and 4,4′-dialkylbiphenyls, considerably increase the pitch. However, dopants having benzene or a binaphthyl structure in the molecular center, and alkyl chain at one side of the molecules and Z-isomers of azobenzene and azoxybenzene derivatives slightly decrease the pitch by acting as impurities that decrease the transition temperature of the host. At X-ray diffraction study of the cholesterics revealed that the pitch increases with an increase in size and amount of the smectic domains induced by the appropriate dopants.

元の言語English
ページ(範囲)12054-12061
ページ数8
ジャーナルJournal of Physical Chemistry B
107
発行部数44
DOI
出版物ステータスPublished - 2003 11 6

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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