Field-induced director dynamics of nematic 4-octyl-4'-cyanobiphenyl: a study by deuterium NMR spectroscopy
Field-induced director dynamics of nematic 4-octyl-4'-cyanobiphenyl: a study by deuterium NMR spectroscopy
Deuterium NMR spectroscopy has been used to investigate the director dynamics in the nematic phase of perdeuteriated 4-octyl-4'-cyanobiphenyl-d(25) (8CB-d(25)) When the electric field is applied to the nematic film, the director moves from being parallel to the magnetic field to being at an angle with respect to it. After the electric field is switched off, the director relaxes back to being parallel to the magnetic field. Deuterium NMR spectra were recorded during the, turn-on and the turn-off alignment processes as a function of time. This particular technique was chosen because the spectral peaks associated with each rigid group in the molecule are clearly resolved and of comparable intensity. For all of the experiments at different temperatures in the nematic phase of 8CB-d(25) we find that the field-induced relaxation times are independent of the group used to determine the director orientation during the alignment process.
nematic liquid crystal, director dynamics, rotational viscosity, deuterium nuclear magnetic resonanceliquid-crystals, induced reorientation, ft-ir, transition
235-248
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Timimi, B A.
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Nakatsuji, M.
1f7a46ce-8ba7-489a-bebc-954861cab123
Okumoto, K.
dbbc8603-43b8-4995-85d5-7a736eb53635
Sugimura, A.
ad404617-1e0f-445f-84d4-1f7efdf57909
Zimmermann, H.
559ddd30-a833-4cf0-a67e-b7b53bbfba17
2003
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Timimi, B A.
845f8bba-a04b-4e8d-adfe-51b13e9f29ca
Nakatsuji, M.
1f7a46ce-8ba7-489a-bebc-954861cab123
Okumoto, K.
dbbc8603-43b8-4995-85d5-7a736eb53635
Sugimura, A.
ad404617-1e0f-445f-84d4-1f7efdf57909
Zimmermann, H.
559ddd30-a833-4cf0-a67e-b7b53bbfba17
Luckhurst, G.R., Timimi, B A., Nakatsuji, M., Okumoto, K., Sugimura, A. and Zimmermann, H.
(2003)
Field-induced director dynamics of nematic 4-octyl-4'-cyanobiphenyl: a study by deuterium NMR spectroscopy.
Molecular Crystals and Liquid Crystals, 398, .
Abstract
Deuterium NMR spectroscopy has been used to investigate the director dynamics in the nematic phase of perdeuteriated 4-octyl-4'-cyanobiphenyl-d(25) (8CB-d(25)) When the electric field is applied to the nematic film, the director moves from being parallel to the magnetic field to being at an angle with respect to it. After the electric field is switched off, the director relaxes back to being parallel to the magnetic field. Deuterium NMR spectra were recorded during the, turn-on and the turn-off alignment processes as a function of time. This particular technique was chosen because the spectral peaks associated with each rigid group in the molecule are clearly resolved and of comparable intensity. For all of the experiments at different temperatures in the nematic phase of 8CB-d(25) we find that the field-induced relaxation times are independent of the group used to determine the director orientation during the alignment process.
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Published date: 2003
Keywords:
nematic liquid crystal, director dynamics, rotational viscosity, deuterium nuclear magnetic resonanceliquid-crystals, induced reorientation, ft-ir, transition
Identifiers
Local EPrints ID: 20034
URI: http://eprints.soton.ac.uk/id/eprint/20034
ISSN: 1542-1406
PURE UUID: 3e52fda9-e8ef-43fe-9bb7-78137ad65522
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Date deposited: 24 Feb 2006
Last modified: 11 Dec 2021 14:27
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Contributors
Author:
G.R. Luckhurst
Author:
B A. Timimi
Author:
M. Nakatsuji
Author:
K. Okumoto
Author:
A. Sugimura
Author:
H. Zimmermann
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