Exploring the behaviour of the twist-bend nematic phase using NMR with a variety of spin probes

Here we discuss the use of deuteriated probe molecules in NMR studies of the nematic (N) and twist-bend nematic (N TB ) phases formed by the generic liquid crystal dimer CB7CB. The key properties of three probes dissolved in the N TB phase investigated are the orientational order S zz B and the coni...

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Bibliographic Details
Published in:Liquid crystals 2020-10, Vol.47 (13), p.2074-2091
Main Authors: Ferrarini, Alberta, Greco, Cristina, Luckhurst, Geoffrey R., Timimi, Bakir A., Zimmermann, Herbert
Format: Article
Language:English
Subjects:
Chirality
Conical angle
Deuterons
Dimers
Haller function
Liquid crystals
NMR
Nuclear magnetic resonance
phase chirality
Probes
prochiral deuterons
Surface Interaction model
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Summary:Here we discuss the use of deuteriated probe molecules in NMR studies of the nematic (N) and twist-bend nematic (N TB ) phases formed by the generic liquid crystal dimer CB7CB. The key properties of three probes dissolved in the N TB phase investigated are the orientational order S zz B and the conical angle, θ 0 , of the director with respect to the spectrometer field. In addition for one probe 5CB-d 2 it is possible to obtain a measure of the phase chirality from the difference in the quadrupolar splittings given by the prochiral pair of deuterons. The relative simplicity of the probes facilitates the determination of the key properties which are obtained using two different approaches.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2020.1769756