Journal ArticleDOI
Molecular Orientation Effects in Compensated Liquid Crystals
Susumu Sato,Masanobu Wada +1 more
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TLDR
In this paper, the phase transition from the homeotropic to the plane texture is observed by applying the high frequency electric field and the critical frequency depends upon the sample temperature and it varies from 3 kHz to 500 kHz as the temperature rises from 17°C to 50°C.Abstract:
An optical and a dielectric memory effect is observed in compensated mixtures of cholesteryl chloride and cholesteryl laurate. When the temperature is increased after a sufficiently high dc electric field is once applied and then reduced to zero at low temperatures, the liquid crystal becomes transparent and the dielectric constant becomes maximum at a temperature approaching the cholesteric to nematic phase transition temperature. This effect can be erased by heating up to an isotropic state. The phase transition from the homeotropic to the plane texture is observed by applying the high frequency electric field. The critical frequency depends upon the sample temperature and it varies from 3 kHz to 500 kHz as the temperature rises from 17°C to 50°C. These phenomena are discussed based on the orientation effects of liquid crystal molecules.read more
Citations
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Journal ArticleDOI
Memory Effects in Nematic Liquid Crystals by a Surface Molecular Reorientation
TL;DR: In this article, the memory effect of the molecular orientation along a lateral component of a nonuniform electric field, which is produced by the patterned electrode structure, is observed after removing the electric field.
Journal ArticleDOI
Optical Activity of Oriented Molecules IV. The anisotropic CD. and UV. Spectra of testosterone propionate
TL;DR: In this article, it was shown that the CD, measured with light beams having different directions of propagation with respect to the molecular framework, is different in magnitude and frequency dependence from the concentration and temperature dependence of the CD.
Journal ArticleDOI
Solid support surface effects on the chromatographic behavior of a liquid crystal stationary phase
Eli Grushka,J. F. Solsky +1 more
TL;DR: In this paper, the behavior of p-ethoxyphenylazo (EPAPU) liquid crystal as a stationary phase coated on glass beads in gas chromatography under a variety of conditions was investigated.
Book ChapterDOI
Comments on the Relaxation Process in the Cholesteric-Nematic Transition
TL;DR: In this article, the authors report some new transient optical and capacitive measurements which emphasize the dependence of the relaxation on sample boundary conditions, which supports earlier inferences of a tilted-Grandjean-planar structure.
Journal ArticleDOI
A new method for solid surface topographical studies using nematic liquid crystals
N. Baber,Z. Strugalski +1 more
TL;DR: In this paper, a new simple method has been developed to investigate the topography of a wide range of solid surfaces using nematic liquid crystals using polarizing microscopy is employed.