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  Understanding the twist-bend nematic phase: the characterisation of 1-(4-cyanobiphenyl-4′-yloxy)-6-(4-cyanobiphenyl-4′-yl)hexane (CB6OCB) and comparison with CB7CB

Paterson, D. A., Gao, M., Kim, Y.-K., Jamali, A., Finley, K. L., Robles-Hernández, B., et al. (2016). Understanding the twist-bend nematic phase: the characterisation of 1-(4-cyanobiphenyl-4′-yloxy)-6-(4-cyanobiphenyl-4′-yl)hexane (CB6OCB) and comparison with CB7CB. Soft Matter, 12(32), 6827-6840. doi:10.1039/C6SM00537C.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0DD1-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-9CC6-B
Genre: Journal Article

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 Creators:
Paterson, Daniel A., Author
Gao, Min, Author
Kim, Young-Ki, Author
Jamali, Afsoon, Author
Finley, Kirsten L., Author
Robles-Hernández, Beatriz, Author
Diez-Berart, Sergio, Author
Salud, Josep, Author
de la Fuente, M. Rosario, Author
Timimi, Bakir A., Author
Zimmermann, Herbert1, Author              
Greco, Cristina, Author
Ferrarini, Alberta, Author
Storey, John M. D., Author
López, David O., Author
Lavrentovich, Oleg D., Author
Luckhurst, Geoffrey R., Author
Imrie, Corrie T., Author
Affiliations:
1Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 Abstract: The synthesis and characterisation of the nonsymmetric liquid crystal dimer, 1-(4-cyanobiphenyl-4′-yloxy)-6-(4-cyanobiphenyl-4′-yl)hexane (CB6OCB) is reported. An enantiotropic nematic (N)–twist-bend nematic (NTB) phase transition is observed at 109 °C and a nematic–isotropic phase transition at 153 °C. The NTB phase assignment has been confirmed using polarised light microscopy, freeze fracture transmission electron microscopy (FFTEM), 2H-NMR spectroscopy, and X-ray diffraction. The effective molecular length in both the NTB and N phases indicates a locally intercalated arrangement of the molecules, and the helicoidal pitch length in the NTB phase is estimated to be 8.9 nm. The surface anchoring properties of CB6OCB on a number of aligning layers is reported. A Landau model is applied to describe high-resolution heat capacity measurements in the vicinity of the NTB–N phase transition. Both the theory and heat capacity measurements agree with a very weak first-order phase transition. A complementary extended molecular field theory was found to be in suggestive accord with the 2H-NMR studies of CB6OCB-d2, and those already known for CB7CB-d4. These include the reduced transition temperature, TNTBN/TNI, the order parameter of the mesogenic arms in the N phase close to the NTB–N transition, and the order parameter with respect to the helix axis which is related to the conical angle for the NTB phase.

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Language(s): eng - English
 Dates: 2016-03-012016-07-112016-07-112016-08-28
 Publication Status: Published in print
 Pages: 14
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 Table of Contents: -
 Rev. Method: Peer
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Title: Soft Matter
  Abbreviation : Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 12 (32) Sequence Number: - Start / End Page: 6827 - 6840 Identifier: ISSN: 1744-683X
CoNE: /journals/resource/1744-683X