High Frequency Relaxation in Nematic Liquid Crystal Mixtures by Brillouin Scattering
作者:
I.G. Siny,
C.-S. Tu,
V.H. Schmidt,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 269,
issue 1
页码: 125-132
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508037326
出版商: Taylor & Francis Group
关键词: Liquid crystal;nematic;relaxation;Brillouin scattering
数据来源: Taylor
摘要:
Brillouin scattering as a function of scattering angles from 180° to ∼10° has been measured in the nematic phases of two liquid crystal mixtures, E. Merck ZLI-2861 and E7, without any preferred orientation. Such measurements at room temperature cover the frequency range from ∼10 to ∼1 GHz. The behavior of both the frequency shifts and linewidths is explained by a single time internal relaxation process with the characteristic frequencies 3.2 (ZLI-2861) and 1.2 (E7) GHz respectively. The behavior of the hypersonic attenuation shows no correlation with the static bulk viscosity in the nematic phase.
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