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13C NMR study of the director distribution adopted by the modulated nematic phases formed by liquid-crystal dimers with odd numbers of atoms in their spacers

13C NMR study of the director distribution adopted by the modulated nematic phases formed by liquid-crystal dimers with odd numbers of atoms in their spacers
13C NMR study of the director distribution adopted by the modulated nematic phases formed by liquid-crystal dimers with odd numbers of atoms in their spacers
The orientational order of the molecules in the bent mesogen CB6OCB has been studied throughout the range of temperature stability of both the NU and NTB liquid-crystal phases by 13C NMR spectroscopy. These spectra provide local order parameters for the para axes of both of the nonequivalent cyanobiphenyl groups and show how they change on entering the twist-bend nematic phase. A key feature of the order parameters is a weak, but clear maximum in the temperature variation of the order parameter prior to the NTB phase. This suggests that the directors in both the NU and NTB phases are tilted with respect to the magnetic field of the spectrometer. Significantly the conformational states of the spacer are comparable in both phases, although the low temperature nematic is chiral but not that at high temperature. It is proposed that the higher temperature, tilted phase could be the splay-bend nematic phase.
2470-0045
Emsley, J.W.
1196f183-5b1c-4948-8f59-e67c0710406e
Lelli, M.
4d5beedf-5630-433e-9119-cbc08d16f4e3
Luckhurst, G.R.
3deaf900-9562-4589-ab5e-3b1fc6fce1a9
Zimmermann, H.
559ddd30-a833-4cf0-a67e-b7b53bbfba17
Emsley, J.W.
1196f183-5b1c-4948-8f59-e67c0710406e
Lelli, M.
4d5beedf-5630-433e-9119-cbc08d16f4e3
Luckhurst, G.R.
3deaf900-9562-4589-ab5e-3b1fc6fce1a9
Zimmermann, H.
559ddd30-a833-4cf0-a67e-b7b53bbfba17

Emsley, J.W., Lelli, M., Luckhurst, G.R. and Zimmermann, H. (2017) 13C NMR study of the director distribution adopted by the modulated nematic phases formed by liquid-crystal dimers with odd numbers of atoms in their spacers. Physical Review E, 96 (6), [062702]. (doi:10.1103/PhysRevE.96.062702).

Record type: Article

Abstract

The orientational order of the molecules in the bent mesogen CB6OCB has been studied throughout the range of temperature stability of both the NU and NTB liquid-crystal phases by 13C NMR spectroscopy. These spectra provide local order parameters for the para axes of both of the nonequivalent cyanobiphenyl groups and show how they change on entering the twist-bend nematic phase. A key feature of the order parameters is a weak, but clear maximum in the temperature variation of the order parameter prior to the NTB phase. This suggests that the directors in both the NU and NTB phases are tilted with respect to the magnetic field of the spectrometer. Significantly the conformational states of the spacer are comparable in both phases, although the low temperature nematic is chiral but not that at high temperature. It is proposed that the higher temperature, tilted phase could be the splay-bend nematic phase.

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More information

Accepted/In Press date: 28 June 2017
e-pub ahead of print date: 15 December 2017
Published date: 15 December 2017

Identifiers

Local EPrints ID: 416990
URI: http://eprints.soton.ac.uk/id/eprint/416990
ISSN: 2470-0045
PURE UUID: 9ec32cb7-b56b-40af-a217-d92b2edf1c35

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Date deposited: 16 Jan 2018 17:30
Last modified: 14 Sep 2021 20:28

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Contributors

Author: J.W. Emsley
Author: M. Lelli
Author: G.R. Luckhurst
Author: H. Zimmermann

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