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NMR study of a bimesogenic liquid crystal with two nematic phases

Burnell, E. E.; Dong, R. Y.; Kohlmeier, A.; Tamba, M. G.; Welch, C.; Mehl, G. H.

Authors

E. E. Burnell

R. Y. Dong

A. Kohlmeier

M. G. Tamba

C. Welch



Abstract

Recent interest in bimesogenic liquid crystals showing two nematic phases has led us to investigate the nematic mean-field interactions in these nematic phases by using rigid solutes as probes. The nematic potential that is modelled by two independent Maier-Saupe terms is successful in fitting the observed dipolar couplings (order parameters) of para-, meta- and ortho-dichlorobenzene solutes in both the nematic phases of 39 wt% of 4-n-pentyl-4′-cyanobiphenyl (5CB) in α,ω-bis(4-4′-cyanobiphenyl)nonane (CB_C9_CB) to better than the 5% level. The derived liquid-crystal potential parameters G₁ and G₂ for each solute in the N and Ntb phases will be discussed. The most interesting observation is that G1 (associated with size and shape interactions) is almost constant in the Ntb phase, whereas G₂ (associated with longer-range electrostatic interactions) has large variation, even changing sign.

Publication Date Mar 24, 2015
Journal Molecular crystals and liquid crystals
Print ISSN 1542-1406
Electronic ISSN 1563-5287
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 610
Issue 1
Pages 100-107
Institution Citation Burnell, E. E., Dong, R. Y., Kohlmeier, A., Tamba, M. G., Welch, C., & Mehl, G. H. (2015). NMR study of a bimesogenic liquid crystal with two nematic phases. Molecular crystals and liquid crystals, 610(1), 100-107. https://doi.org/10.1080/15421406.2015.1025211
DOI https://doi.org/10.1080/15421406.2015.1025211
Keywords General Materials Science; General Chemistry; Condensed Matter Physics
Publisher URL http://www.tandfonline.com/doi/full/10.1080/15421406.2015.1025211#.VebPJyVVhBc
Copyright Statement ©2015 University of Hull
Additional Information This is an Accepted Manuscript of an article published by Taylor & Francis in Molecular Crystals and Liquid Crystals on 6 July 2015, available online: http://wwww.tandfonline.../15421406.2015.1025211.

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