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Twist-bend nematic phase in cyanobiphenyls and difluoroterphenyls bimesogens

Panov, Vitaly P.; Vij, Jagdish K.; Mehl, Georg H.

Authors

Vitaly P. Panov

Jagdish K. Vij



Abstract

The paper reviews assignment of the low-temperature nematic phase observed in simple bimesogenic or dimeric systems based on cyanobiphenyls and difluoroterphenyls to the twist-bend nematic phase, NTB, using a range of experimental techniques. These include DSC, X-rays, Polarising Microscopy, electro-optics, birefringence and measurements of the electroclinic effect arising from flexoelectricity. An emphasis is laid on the observations of the chiral domains of opposite handedness at zero field in an otherwise achiral liquid crystalline system in this phase. These observations are a direct consequence of the structure of the twist-bend phase predicted by Ivan Dozov for achiral bent core molecules. The paper reviews the electro-optic phenomena and the observed electroclinic effect and how these observations assign it as the NTB phase. Results of the nanoscale helical pitch measurements using freeze-fracture microscopy are reviewed and discussed briefly. Results of the measurements of elastic constants especially close to the N–NTB transition are also reviewed.

Journal Article Type Article
Publication Date Jan 2, 2017
Journal Liquid crystals
Print ISSN 0267-8292
Electronic ISSN 1366-5855
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 44
Issue 1
Pages 147-159
APA6 Citation Panov, V. P., Vij, J. K., & Mehl, G. H. (2017). Twist-bend nematic phase in cyanobiphenyls and difluoroterphenyls bimesogens. Liquid crystals, 44(1), 147-159. https://doi.org/10.1080/02678292.2016.1254289
DOI https://doi.org/10.1080/02678292.2016.1254289
Keywords Twist bend nematic phase; Dimers; Nematic liquid crystals; Electroclinic effect; Flexoelectricity
Publisher URL http://www.tandfonline.com/doi/full/10.1080/02678292.2016.1254289
Additional Information This is an Accepted Manuscript of an article published by Taylor & Francis in Liquid crystals on 20/11/2016, available online: http://wwww.tandfonline...0/02678292.2016.1254289

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