Pretransitional nonlinear dielectric effect, Kerr effect and optical rotation in isotropic cholesterogens

Cholesteryl oleate and cholesteryl oleyl carbonate have been studied in the vicinity of the isotropic-blue phase transition by nonlinear dielectric effect (NDE), electro-optical Kerr effect (EKE) and optical rotation (OR) methods. The electrically induced pretransitional effects follow the classical...

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Bibliographic Details
Published in:Chemical physics 1988-04, Vol.121 (2), p.255-263
Main Authors: Pyżuk, W., Słomka, I., Chrapeć, J., Rzoska, S., Zioło, J.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Physics
Specific phase transitions
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Summary:Cholesteryl oleate and cholesteryl oleyl carbonate have been studied in the vicinity of the isotropic-blue phase transition by nonlinear dielectric effect (NDE), electro-optical Kerr effect (EKE) and optical rotation (OR) methods. The electrically induced pretransitional effects follow the classical 1/( T-T*) behaviour, the OR reveals more complex behaviour. The noncritical background due to contributions from individual molecules, is observed by the NDE method. The electric permittivity anisotropies of the perfectly ordered phase are determined from the ratio of the NDE to EKE amplitudes. Some procedures which yield the accurate determination of the Kerr constant in chiral systems are discussed.
ISSN:0301-0104
DOI:10.1016/0301-0104(88)90032-8