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Fluorescence study on a physical gel of a cyanobiphenyl liquid crystal
Author(s) -
Oya Masato,
Machida Shinjiro,
Horie Kazuyuki,
Kato Takashi,
Hanabusa Kenji
Publication year - 2000
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/1099-1581(200008/12)11:8/12<456::aid-pat43>3.0.co;2-6
Subject(s) - liquid crystal , cyclohexane , materials science , fluorescence , molecule , intermolecular force , crystal (programming language) , thermal fluctuations , chemical physics , organic chemistry , optics , chemistry , thermodynamics , optoelectronics , computer science , programming language , physics
We have measured temperature dependence of fluorescence peak wavelengths of a nematic liquid crystal, 4′‐pentyl‐4‐cyanobiphenyl, and its physical gel, which is formed by the aggregation of hydrogen‐bonded networks of trans ‐ ( 1 R , 2 R ) ‐ bis ( dodecanoylamino ) cyclohexane. Intermolecular interactions and thermal fluctuation of the liquid crystal and its physical gel are evaluated. The gelation causes a red shift of fluorescence, suggesting the restriction of thermal fluctuation of the liquid crystal by the gelation even though most of the cyanobiphenyl molecules are isolated from the molecular network. The isotropic–nematic transition of the liquid crystal induces a red shift of fluorescence in the presence of the gelling agent, while a small blue shift is observed at the isotropic–nematic transition without the gelling agent. For the single component of the liquid crystal, emission peaks excited at two wavelengths have also been measured and the results are discussed in relation to the difference between the liquid‐crystalline molecules in the vicinity of the interface with substrates and the bulk liquid‐crystalline molecules. Copyright © 2000 John Wiley & Sons, Ltd.