Phase Transition Isotropic Liquid-Nematic in Films with Two Free Surfaces
作者:
P. Simova,
Y. Marinov,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1992)
卷期:
Volume 210,
issue 1
页码: 83-94
ISSN:1058-725X
年代: 1992
DOI:10.1080/10587259208030759
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The nematic layer growing from the isotropic liquid of a free suspended film has been investigated. The selected substances possess different dielectric anisotropy, molecular orientation of the interfaces, latent heat of the N-I phase transition, a kind of phase under the nematic. It is found that the nematic layers of the two interfaces nematic-air arise and grow at very slow cooling independently if the thickness of the free film is ≥8 μm. After the upper nematic layer of some substances reaches ∼5 μm thickness, the formation of drops begins under the layer on the interface nematic-isotropic liquid. For substances in which the molecules lie approximately in the interface N-I at the same experimental conditions the drops are not seen. It is found that the transition I-N does not depend on the kind of phase under the nematic if the nematic temperature region is not too small.
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