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On the investigation of field-induced director dynamics: a novel ESR experiment

On the investigation of field-induced director dynamics: a novel ESR experiment
On the investigation of field-induced director dynamics: a novel ESR experiment
The rotational viscosity coefficient of a nematic liquid crystal with a positive diamagnetic susceptibility anisotropy can be determined by monitoring the time dependence of the director orientation as it is rotated by a field from a non-equilibrium to the equilibrium state parallel to the field. A variety of techniques is available using different properties to monitor the director orientation as a function of time. Normally these experiments are designed so that the property used to determine the director orientation does not change during the time taken for its measurement. Here using ESR spectroscopy, we explore the benefits of exploiting exactly the opposite situation. That is during the time taken to record the ESR spectrum the director orientation is allowed to change. We have developed both semi-quantitative and quantitative models to allow us to simulate how the form of the spectrum depends on experimental conditions such as the field scan rate. These models have also proved to be valuable in designing the experiment and in analysing the spectra. It seems that this novel ESR experiment provides a valuable route to the field-induced relaxation time and hence to the rotational viscosity coefficient.
nematic liquid crystals, rotational viscosity coefficient, field-induced relaxation time, esr spectroscopy
1542-1406
45-61
Becker, J.
f2e3a494-e85b-4f6c-9410-82b82644dd20
Dunmur, D.A.
d10d31b4-e7ac-4a9d-9cfc-b53f1b1a35a7
Dunn, C.J.
d0f96544-b5c4-4898-ad6e-8ef3d312e097
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Marchant-Lane, S.E.
eb7308d5-0347-4519-8de2-2b9ba915a6cb
Timimi, B.A.
845f8bba-a04b-4e8d-adfe-51b13e9f29ca
Becker, J.
f2e3a494-e85b-4f6c-9410-82b82644dd20
Dunmur, D.A.
d10d31b4-e7ac-4a9d-9cfc-b53f1b1a35a7
Dunn, C.J.
d0f96544-b5c4-4898-ad6e-8ef3d312e097
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Marchant-Lane, S.E.
eb7308d5-0347-4519-8de2-2b9ba915a6cb
Timimi, B.A.
845f8bba-a04b-4e8d-adfe-51b13e9f29ca

Becker, J., Dunmur, D.A., Dunn, C.J., Luckhurst, G.R., Marchant-Lane, S.E. and Timimi, B.A. (2003) On the investigation of field-induced director dynamics: a novel ESR experiment. Molecular Crystals and Liquid Crystals, 394 (1), 45-61.

Record type: Article

Abstract

The rotational viscosity coefficient of a nematic liquid crystal with a positive diamagnetic susceptibility anisotropy can be determined by monitoring the time dependence of the director orientation as it is rotated by a field from a non-equilibrium to the equilibrium state parallel to the field. A variety of techniques is available using different properties to monitor the director orientation as a function of time. Normally these experiments are designed so that the property used to determine the director orientation does not change during the time taken for its measurement. Here using ESR spectroscopy, we explore the benefits of exploiting exactly the opposite situation. That is during the time taken to record the ESR spectrum the director orientation is allowed to change. We have developed both semi-quantitative and quantitative models to allow us to simulate how the form of the spectrum depends on experimental conditions such as the field scan rate. These models have also proved to be valuable in designing the experiment and in analysing the spectra. It seems that this novel ESR experiment provides a valuable route to the field-induced relaxation time and hence to the rotational viscosity coefficient.

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More information

Published date: 2003
Keywords: nematic liquid crystals, rotational viscosity coefficient, field-induced relaxation time, esr spectroscopy

Identifiers

Local EPrints ID: 19900
URI: https://eprints.soton.ac.uk/id/eprint/19900
ISSN: 1542-1406
PURE UUID: 74b80a19-f001-4be1-876c-e14bdcf63e68

Catalogue record

Date deposited: 23 Feb 2006
Last modified: 15 Jul 2019 19:26

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