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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

Emsley, J. W., Lelli, M., Luckhurst, G. R., & 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, pp. 1-16. doi:10.1103/PhysRevE.96.062702.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002E-8F23-5 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002E-8F24-3
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https://journals.aps.org/pre/pdf/10.1103/PhysRevE.96.062702 (Any fulltext)
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Emsley, J. W., Author
Lelli, M., Author
Luckhurst, G. R., Author
Zimmermann, Herbert1, Author           
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1Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 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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Language(s): eng - English
 Dates: 2017-12
 Publication Status: Issued
 Pages: 16
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 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevE.96.062702
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Title: Physical Review E
  Other : Phys. Rev. E
Source Genre: Journal
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Publ. Info: Melville, NY : American Physical Society
Pages: - Volume / Issue: 96 (6) Sequence Number: 062702 Start / End Page: 1 - 16 Identifier: ISSN: 1539-3755
CoNE: https://pure.mpg.de/cone/journals/resource/954925225012