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A neutron scattering study of orientational ordering in the smectic and nematic phases of the liquid crystal, 2',3'-difluoro-4-heptyl-4"-nonyl p-terphenyl

A neutron scattering study of orientational ordering in the smectic and nematic phases of the liquid crystal, 2',3'-difluoro-4-heptyl-4"-nonyl p-terphenyl
A neutron scattering study of orientational ordering in the smectic and nematic phases of the liquid crystal, 2',3'-difluoro-4-heptyl-4"-nonyl p-terphenyl
The orientational order parameters (P) over bar (2), (P) over bar (4), and (P) over bar (6) have been determined by neutron scattering from a mixture of normal hydrogenous and deuterium labeled molecules in the nematic, smectic A and smectic C phases of the mesogen 2',3'-difluoro-4-heptyl-4"-nonyl-p-terphenyl. Since the method relies on a knowledge of the molecular structure, the influence of different molecular conformations resulting from the terminal chains on the values determined was examined in detail. It was shown that the choice of conformation could significantly effect the resulting values of the order parameters. The order parameters were, therefore, determined by assuming a distribution of conformations for the alkyl chains. The relative contributions of these conformations were governed by the Flory rotational isomeric state model. The values for (P) over bar (2) were consistent with those determined by nuclear magnetic resonance but all the order parameters were generally much greater than those predicted by the Maier-Saupe theory.
diffraction, parameters, systems
0021-9606
3887-3899
Hamley, I.W.
aa1c38a0-dc90-4cc8-9a0a-b8e2186e0451
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Richardson, R.M.
078e0f27-01e2-4c5f-b500-77d18eeb43ba
Santos, F.
2d0490b8-1b08-417e-9535-22db3dd7e7c5
Hamley, I.W.
aa1c38a0-dc90-4cc8-9a0a-b8e2186e0451
Luckhurst, G.R.
7807d1c6-54a1-414f-9abe-22de4d9c30f7
Richardson, R.M.
078e0f27-01e2-4c5f-b500-77d18eeb43ba
Santos, F.
2d0490b8-1b08-417e-9535-22db3dd7e7c5

Hamley, I.W., Luckhurst, G.R., Richardson, R.M. and Santos, F. (2002) A neutron scattering study of orientational ordering in the smectic and nematic phases of the liquid crystal, 2',3'-difluoro-4-heptyl-4"-nonyl p-terphenyl. Journal of Chemical Physics, 116 (9), 3887-3899. (doi:10.1063/1.1446435).

Record type: Article

Abstract

The orientational order parameters (P) over bar (2), (P) over bar (4), and (P) over bar (6) have been determined by neutron scattering from a mixture of normal hydrogenous and deuterium labeled molecules in the nematic, smectic A and smectic C phases of the mesogen 2',3'-difluoro-4-heptyl-4"-nonyl-p-terphenyl. Since the method relies on a knowledge of the molecular structure, the influence of different molecular conformations resulting from the terminal chains on the values determined was examined in detail. It was shown that the choice of conformation could significantly effect the resulting values of the order parameters. The order parameters were, therefore, determined by assuming a distribution of conformations for the alkyl chains. The relative contributions of these conformations were governed by the Flory rotational isomeric state model. The values for (P) over bar (2) were consistent with those determined by nuclear magnetic resonance but all the order parameters were generally much greater than those predicted by the Maier-Saupe theory.

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Published date: 1 March 2002
Keywords: diffraction, parameters, systems
Organisations: Chemistry

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Local EPrints ID: 19755
URI: http://eprints.soton.ac.uk/id/eprint/19755
ISSN: 0021-9606
PURE UUID: 3e2a9f86-db6f-4a25-99d1-03399443e7d7

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Date deposited: 20 Feb 2006
Last modified: 08 Jan 2022 06:46

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Contributors

Author: I.W. Hamley
Author: G.R. Luckhurst
Author: R.M. Richardson
Author: F. Santos

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