A Deuterium Nuclear Magnetic Resonance Investigation of Field Induced Director Dynamics in a Nematic Slab Subject to Magnetic and Pulsed Electric Fields
作者:
ChristopherJ. Dunn,
GeoffreyR. Luckhurst,
Tetsuo Miyamoto,
Hiroyoshi Naito,
Akihiko Sugimura,
BakirA. Timimi,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 347,
issue 1
页码: 167-178
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008024838
出版商: Taylor & Francis Group
关键词: director dynamics;rotational viscosity;diamagnetic anisotropy;deuterium nuclear magnetic resonance
数据来源: Taylor
摘要:
Deuterium nuclear magnetic resonance (NMR) spectroscopy has been used to investigate the field-induced director dynamics in a nematic liquid crystal, 4-pentyl-d2-4′-cyanobiphenyl (5CB-d2) deuteriated in the α-position of the pentyl chain, confined between two glass plates. The NMR spectra have been measured as a function of time after turning an electric field on and off. It is demonstrated that the field-induced director dynamics in the nematic liquid crystal cells can be successfully time-resolved. In addition, it is found that the doublet NMR spectra become powder-like during the turn-on and turn-off processes. It is shown that the rotational viscosity and the diamagnetic anisotropy of 5CB-d2can be determined from the time-resolved NMR spectra by assuming uniform alignment of the director.
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