Nuclear magnetic resonance studies of liquid crystals
Nuclear magnetic resonance studies of liquid crystals
This thesis is concerned with the investigation of liquid crystals using the technique of Nuclear Magnetic Resonance (N.M.R.) spectroscopy. An introduction to the properties of liquid crystals is given in Chapter 1, along with a resume of N.M.R. spectroscopy. The second chapter is concerned with the parameters that are measured by the technique of N.M.R. as a consequence of the statistical mechanical averaging of flexible molecules. In the next chapter models for the alkyl chain of a liquid crystal molecule are discussed and a method of calculating N.M.R. properties is given based on the rotational isomeric state model of Flory (192). Chapter 4 is concerned with the deuterium spectrum of 4-cyan-4'-n-octyl-d17 biphenyl (8CB-d17). Firstly the results are discussed in terms of a single ordering matrix for the whole molecule with temperature independent conformational properties as proposed by Doane et al. (85, 88). Then the rotational isomeric state model is applied to the alkyl chain of the molecules, but still with a single ordering matrix for the molecule as a whole. The work discussed in that chapter is part of a paper by N. Boden,R. J. Bushby, L. Clark, J. W. Emsley, G. R. Luckhurst and C. P. Stockley submitted to Molecular Physics. In Chapter 5 the N.M.R. spectra, both proton and deuterium, of specifically deuterated 4-cyan-4'-n-pentylcyanobiphenyl are reported and discussed. Chapters 6 and 7 are concerned with the development of a mean-field theory of nematics which allows for the flexibility of the molecules. In chapter 6 it is used to calculate the order along the alkyl chain of the molecule, while in chapter 7 the thermodynamic properties are calculated. Chapter 7 also contains a fuller derivation of the theory and a comparison with other theories.
University of Southampton
1980
Stockley, Charles Pierre
(1980)
Nuclear magnetic resonance studies of liquid crystals.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This thesis is concerned with the investigation of liquid crystals using the technique of Nuclear Magnetic Resonance (N.M.R.) spectroscopy. An introduction to the properties of liquid crystals is given in Chapter 1, along with a resume of N.M.R. spectroscopy. The second chapter is concerned with the parameters that are measured by the technique of N.M.R. as a consequence of the statistical mechanical averaging of flexible molecules. In the next chapter models for the alkyl chain of a liquid crystal molecule are discussed and a method of calculating N.M.R. properties is given based on the rotational isomeric state model of Flory (192). Chapter 4 is concerned with the deuterium spectrum of 4-cyan-4'-n-octyl-d17 biphenyl (8CB-d17). Firstly the results are discussed in terms of a single ordering matrix for the whole molecule with temperature independent conformational properties as proposed by Doane et al. (85, 88). Then the rotational isomeric state model is applied to the alkyl chain of the molecules, but still with a single ordering matrix for the molecule as a whole. The work discussed in that chapter is part of a paper by N. Boden,R. J. Bushby, L. Clark, J. W. Emsley, G. R. Luckhurst and C. P. Stockley submitted to Molecular Physics. In Chapter 5 the N.M.R. spectra, both proton and deuterium, of specifically deuterated 4-cyan-4'-n-pentylcyanobiphenyl are reported and discussed. Chapters 6 and 7 are concerned with the development of a mean-field theory of nematics which allows for the flexibility of the molecules. In chapter 6 it is used to calculate the order along the alkyl chain of the molecule, while in chapter 7 the thermodynamic properties are calculated. Chapter 7 also contains a fuller derivation of the theory and a comparison with other theories.
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Published date: 1980
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Local EPrints ID: 459209
URI: http://eprints.soton.ac.uk/id/eprint/459209
PURE UUID: daaa7ed4-9484-4160-a334-1a0f0f843b04
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Date deposited: 04 Jul 2022 17:06
Last modified: 04 Jul 2022 17:06
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Author:
Charles Pierre Stockley
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