Archbold, Craig T., Andrews, Jessica L., Mandle, Richard J. orcid.org/0000-0001-9816-9661 et al. (2 more authors) (2017) Effect of the linking unit on the twist-bend nematic phase in liquid crystal dimers : a comparative study of two homologous series of methylene- and ether-linked dimers. LIQUID CRYSTALS. pp. 84-92. ISSN 1366-5855
Abstract
Two series of bimesogens with phenyl benzoate mesogenic units were prepared: one series having a heptamethylene spacer and the other a pentamethylene spacer with two ether-linking groups. These materials were prepared to provide experimental backing to the widely held hypothesis that methylene-linked bimesogens are more likely to exhibit the twist-bend nematic mesophase than their ether-linked counterparts. Several of the methylene-linked materials exhibited nematic and NTB mesophases, whereas the analogous ether-linked materials gave only nematic phases albeit with significantly higher clearing points. Virtual N–NTB transition temperatures for both methylene- and ether-linked bimesogens were extrapolated by constructing binary phase diagrams with the well-studied twist-bend material CB9CB. Contrary to our expectations these virtual transition temperatures were in most cases higher for the ether-linked bimesogens than in the analogous methylene compounds, this runs counter to reported theories and hypotheses that the incorporation of ether-linking groups should serve to destabilise the NTB phase.
Metadata
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Copyright, Publisher and Additional Information: | © 2016 Informa UK Limited, trading as Taylor & Francis Group. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details | ||||
Keywords: | bimesogens, Liquid crystals, twist-bend nematic | ||||
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Institution: | The University of York | ||||
Academic Units: | The University of York > Faculty of Sciences (York) > Chemistry (York) | ||||
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Depositing User: | Pure (York) | ||||
Date Deposited: | 09 Aug 2017 10:00 | ||||
Last Modified: | 06 Dec 2023 11:59 | ||||
Published Version: | https://doi.org/10.1080/02678292.2016.1240247 | ||||
Status: | Published | ||||
Refereed: | Yes | ||||
Identification Number: | https://doi.org/10.1080/02678292.2016.1240247 | ||||
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