Srigengan, S., Liu, H., Osipov, M. A. et al. (3 more authors) (2019) Anomalies in the twist elastic behaviour of mixtures of calamitic and bent-core liquid crystals. LIQUID CRYSTALS. ISSN 1366-5855
Abstract
The splay, twist and bend elastic constants (K11, K22 and K33) have been measured as a function of temperature in bent-core/calamitic mixtures based on three different calamitic materials (5CB, 8CB and ZLI1132) and two bent-core dopants. The behaviour of the splay and bend constants are as expected; a reduction in K33 of ~20%, in line with predictions from mixing rules and other observations. Interestingly, no change is seen in the splay constant, K11 of the calamitic hosts. Surprisingly though, the twist elastic constant exhibits a reduction of 30–40% in all mixtures across the nematic range, an effect not previously reported and much larger than mixing rules can explain. The elastic behaviour is universal in our mixtures. We explain part of the reduction in the twist deformation by considering the influence of the chiral conformer fluctuations of the bent-core molecules on the twist elastic constants of the mixtures. However, the dramatic reduction can only be fully explained by also including contributions from chiral conformer fluctuations of the calamitic host, a form of chiral amplification.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 The Author(s). |
Keywords: | bent-core liquid crystals,calamitic liquid crystals,chirality,Elastic properties,liquid crystal mixtures,polarity |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Chemistry (York) |
Depositing User: | Pure (York) |
Date Deposited: | 06 Dec 2019 14:30 |
Last Modified: | 16 Oct 2024 16:15 |
Published Version: | https://doi.org/10.1080/02678292.2019.1687767 |
Status: | Published online |
Refereed: | Yes |
Identification Number: | 10.1080/02678292.2019.1687767 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:154306 |
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Description: Anomalies in the twist elastic behaviour of mixtures of calamitic and bent core liquid crystals
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