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EPR study of the polydomain structure of the twist-bend nematic phase of CB9CB in the bulk

Bacchiocchi, Corrado; Tamba, Maria-Gabriela; Mehl, Georg H.; Arcioni, Alberto; Miglioli, Isabella; Zannoni, Claudio

Authors

Corrado Bacchiocchi

Maria-Gabriela Tamba

Alberto Arcioni

Isabella Miglioli

Claudio Zannoni

Abstract

EPR spin probe spectra of the liquid crystal phases exhibited, in the bulk, by the 1″,9″-bis(4-
cyanobiphenyl-4’-yl)nonane (CB9CB) bent-shape dimer showed that, on cooling from the isotropic
phase, this material forms a uniaxial nematic phase with a uniform director macroscopically
aligned along the spectrometer field. Upon further cooling, a transition into the twist-bend
nematic phase is observed after a biphasic region of approximately 4 K. In this lower temperature
nematic phase, the director does not appear to be macroscopically aligned. The non-uniform
director distribution is modelled as a collection of monodomains tilted with respect to the
magnetic field and orientationally distributed around the tilt direction.

Journal Article Type Article
Publication Date Aug 2, 2018
Journal Liquid Crystals
Print ISSN 0267-8292
Electronic ISSN 1366-5855
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 45
Issue 13-15
Pages 2109-2120
Institution Citation Bacchiocchi, C., Tamba, M., Mehl, G. H., Arcioni, A., Miglioli, I., & Zannoni, C. (2018). EPR study of the polydomain structure of the twist-bend nematic phase of CB9CB in the bulk. Liquid crystals, 45(13-15), 2109-2120. https://doi.org/10.1080/02678292.2018.1501110
DOI https://doi.org/10.1080/02678292.2018.1501110
Keywords General Materials Science; General Chemistry; Condensed Matter Physics
Publisher URL https://www.tandfonline.com/doi/full/10.1080/02678292.2018.1501110
Copyright Statement ©2018 University of Hull
Additional Information Peer Review Statement: The publishing and review policy for this title is described in its Aims & Scope.; Aim & Scope: http://www.tandfonline....cope&journalCode=tlct20

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