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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.


E. E. Burnell

R. Y. Dong

A. Kohlmeier

M. G. Tamba

C. Welch


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
APA6 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.
Keywords General Materials Science; General Chemistry; Condensed Matter Physics
Publisher URL
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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