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Molecular field theory for biaxial nematics formed from liquid crystal dimers and inhibited by the twist-bend nematic

Molecular field theory for biaxial nematics formed from liquid crystal dimers and inhibited by the twist-bend nematic
Molecular field theory for biaxial nematics formed from liquid crystal dimers and inhibited by the twist-bend nematic
Liquid crystal dimers with odd spacers are good candidates as materials for biaxial nematic phases (NB). The dimers are flexible molecules sustaining biaxial conformations, and couplings between the conformational and orientational distributions could be expected to stabilise NB. We apply a molecular field theory for flexible molecules developed elsewhere to study a simple system made up of dimers composed of two cylindrically symmetric mesogenic groups. Our model allows for two idealised conformations: one linear and one bent at a tetrahedral angle. For a restricted set of chain lengths, the model predicts a first-order reentrant phase transition from the NB phase into a low temperature uniaxial nematic phase (NU ). However the formation of the biaxial nematic could be blocked by the appearance of a twist-bent nematic.
1463-9076
29321-29332
To, Tung Ba Thanh
82b77b8d-0ea0-45ca-930a-e944be4d2dc5
Sluckin, Timothy (Tim) J.
8dbb6b08-7034-4ae2-aa65-6b80072202f6
Luckhurst, Geoffrey R.
3deaf900-9562-4589-ab5e-3b1fc6fce1a9
To, Tung Ba Thanh
82b77b8d-0ea0-45ca-930a-e944be4d2dc5
Sluckin, Timothy (Tim) J.
8dbb6b08-7034-4ae2-aa65-6b80072202f6
Luckhurst, Geoffrey R.
3deaf900-9562-4589-ab5e-3b1fc6fce1a9

To, Tung Ba Thanh, Sluckin, Timothy (Tim) J. and Luckhurst, Geoffrey R. (2017) Molecular field theory for biaxial nematics formed from liquid crystal dimers and inhibited by the twist-bend nematic. Physical Chemistry Chemical Physics, 19 (43), 29321-29332. (doi:10.1039/C7CP04350C).

Record type: Article

Abstract

Liquid crystal dimers with odd spacers are good candidates as materials for biaxial nematic phases (NB). The dimers are flexible molecules sustaining biaxial conformations, and couplings between the conformational and orientational distributions could be expected to stabilise NB. We apply a molecular field theory for flexible molecules developed elsewhere to study a simple system made up of dimers composed of two cylindrically symmetric mesogenic groups. Our model allows for two idealised conformations: one linear and one bent at a tetrahedral angle. For a restricted set of chain lengths, the model predicts a first-order reentrant phase transition from the NB phase into a low temperature uniaxial nematic phase (NU ). However the formation of the biaxial nematic could be blocked by the appearance of a twist-bent nematic.

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Tung_etal_preprintPCCP2017(2) - Accepted Manuscript
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Accepted/In Press date: 25 September 2017
e-pub ahead of print date: 27 September 2017
Published date: 21 November 2017

Identifiers

Local EPrints ID: 414754
URI: http://eprints.soton.ac.uk/id/eprint/414754
ISSN: 1463-9076
PURE UUID: 7254a595-fa45-46c0-a2d8-4810d7ac0a8b
ORCID for Timothy (Tim) J. Sluckin: ORCID iD orcid.org/0000-0002-9163-0061

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Date deposited: 10 Oct 2017 16:31
Last modified: 17 Dec 2019 05:52

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