The University of Southampton
University of Southampton Institutional Repository

Field-induced director dynamics in a nematic liquid crystal: a molecular site dependence?

Field-induced director dynamics in a nematic liquid crystal: a molecular site dependence?
Field-induced director dynamics in a nematic liquid crystal: a molecular site dependence?
Studies of the field-induced alignment of the nematic director for low molar mass materials using vibrational spectroscopy have revealed some fascinatingly unexpected results. Several studies have found that the relaxation time for the director alignment is dependent on the group in the molecule used to monitor the director orientation. Seemingly this undermines the basic concept of the Leslie-Ericksen hydrodynamic theory of nematics. Here we report complementary studies using deuterium NMR spectroscopy of perdeuteriated 4-pentyl-4'-cyanobiphenyl where the director is aligned by a magnetic or an electric field. This particular technique was chosen because the spectral peaks associated with each rigid group in the molecule are clearly resolved and of comparable intensity. We have investigated the director alignment using different temperatures, electric field strengths and angles between the magnetic and electric fields, each of which influences the director relaxation time. For all of the experiments we find that the relaxation times are independent of the group used to determine the director orientation during the alignment process.
induced reorientation, ft-ir, transition
0021-9606
5099-5106
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Miyamoto, T.
bd635bfc-13ea-41bd-a687-e5466a9cdbd4
Sugimura, A.
ad404617-1e0f-445f-84d4-1f7efdf57909
Timimi, B.A.
845f8bba-a04b-4e8d-adfe-51b13e9f29ca
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Miyamoto, T.
bd635bfc-13ea-41bd-a687-e5466a9cdbd4
Sugimura, A.
ad404617-1e0f-445f-84d4-1f7efdf57909
Timimi, B.A.
845f8bba-a04b-4e8d-adfe-51b13e9f29ca

Luckhurst, G.R., Miyamoto, T., Sugimura, A. and Timimi, B.A. (2002) Field-induced director dynamics in a nematic liquid crystal: a molecular site dependence? Journal of Chemical Physics, 116 (12), 5099-5106. (doi:10.1063/1.1452106).

Record type: Article

Abstract

Studies of the field-induced alignment of the nematic director for low molar mass materials using vibrational spectroscopy have revealed some fascinatingly unexpected results. Several studies have found that the relaxation time for the director alignment is dependent on the group in the molecule used to monitor the director orientation. Seemingly this undermines the basic concept of the Leslie-Ericksen hydrodynamic theory of nematics. Here we report complementary studies using deuterium NMR spectroscopy of perdeuteriated 4-pentyl-4'-cyanobiphenyl where the director is aligned by a magnetic or an electric field. This particular technique was chosen because the spectral peaks associated with each rigid group in the molecule are clearly resolved and of comparable intensity. We have investigated the director alignment using different temperatures, electric field strengths and angles between the magnetic and electric fields, each of which influences the director relaxation time. For all of the experiments we find that the relaxation times are independent of the group used to determine the director orientation during the alignment process.

This record has no associated files available for download.

More information

Published date: 22 March 2002
Keywords: induced reorientation, ft-ir, transition
Organisations: Chemistry

Identifiers

Local EPrints ID: 19812
URI: http://eprints.soton.ac.uk/id/eprint/19812
ISSN: 0021-9606
PURE UUID: fe2f5e8b-8a5c-46e5-8129-fa298b7af5c2

Catalogue record

Date deposited: 21 Feb 2006
Last modified: 08 Jan 2022 06:46

Export record

Altmetrics

Contributors

Author: G.R. Luckhurst
Author: T. Miyamoto
Author: A. Sugimura
Author: B.A. Timimi

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×