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Field-induced director alignment for 4-nonyl-4'-cyanobiphenyl near the smectic A - Nematic transition

Field-induced director alignment for 4-nonyl-4'-cyanobiphenyl near the smectic A - Nematic transition
Field-induced director alignment for 4-nonyl-4'-cyanobiphenyl near the smectic A - Nematic transition
Deuterium NMR spectroscopy has been used to investigate the director dynamics of deuteriated 4-alpha,alpha-d(2)-nonyl-4'-cyanobiphenyl, where the director was aligned by an electric field. The electric field direction made an angle of 47 degrees with the magnetic field in order to provide a unique alignment pathway; accordingly the director is expected to rotate as a monodomain. The time dependence of the director orientation was investigated at different temperatures. At each temperature in the nematic phase, all of the deuterium NMR spectra indicate that the director was uniformly oriented as a monodomain. It was found that the relaxation time in the smectic A phase is about 1,000,000 times as large as that in the nematic phase. This also results in a strong pretransitional growth of the relaxation time as the transition to the smectic A phase is approached.
deuterium nmr-spectroscopy, magnetic-resonance spectroscopy, liquid-crystal, dynamics, phase, 4-octyl-4'-cyanobiphenyl, behavior
1542-1406
131-141
Kamada, D.
5d523884-1f41-448a-b6ae-980ea2dbd124
Okumoto, K.
dbbc8603-43b8-4995-85d5-7a736eb53635
Sugimura, A.
ad404617-1e0f-445f-84d4-1f7efdf57909
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Timimi, B A.
f4a1a640-d675-4eeb-8aae-bd818f2210cb
Zimmermann, H.
559ddd30-a833-4cf0-a67e-b7b53bbfba17
Kamada, D.
5d523884-1f41-448a-b6ae-980ea2dbd124
Okumoto, K.
dbbc8603-43b8-4995-85d5-7a736eb53635
Sugimura, A.
ad404617-1e0f-445f-84d4-1f7efdf57909
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Timimi, B A.
f4a1a640-d675-4eeb-8aae-bd818f2210cb
Zimmermann, H.
559ddd30-a833-4cf0-a67e-b7b53bbfba17

Kamada, D., Okumoto, K., Sugimura, A., Luckhurst, G.R., Timimi, B A. and Zimmermann, H. (2005) Field-induced director alignment for 4-nonyl-4'-cyanobiphenyl near the smectic A - Nematic transition. Molecular Crystals and Liquid Crystals, 441, 131-141. (doi:10.1080/154214091009626).

Record type: Article

Abstract

Deuterium NMR spectroscopy has been used to investigate the director dynamics of deuteriated 4-alpha,alpha-d(2)-nonyl-4'-cyanobiphenyl, where the director was aligned by an electric field. The electric field direction made an angle of 47 degrees with the magnetic field in order to provide a unique alignment pathway; accordingly the director is expected to rotate as a monodomain. The time dependence of the director orientation was investigated at different temperatures. At each temperature in the nematic phase, all of the deuterium NMR spectra indicate that the director was uniformly oriented as a monodomain. It was found that the relaxation time in the smectic A phase is about 1,000,000 times as large as that in the nematic phase. This also results in a strong pretransitional growth of the relaxation time as the transition to the smectic A phase is approached.

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More information

Published date: 2005
Keywords: deuterium nmr-spectroscopy, magnetic-resonance spectroscopy, liquid-crystal, dynamics, phase, 4-octyl-4'-cyanobiphenyl, behavior

Identifiers

Local EPrints ID: 20835
URI: http://eprints.soton.ac.uk/id/eprint/20835
ISSN: 1542-1406
PURE UUID: a84a8c89-b36f-485a-ad62-8d7be5d04e89

Catalogue record

Date deposited: 03 Mar 2006
Last modified: 06 Oct 2020 23:43

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