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Issue 38, 2014
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Flexoelectric behavior of bimesogenic liquid crystals in the nematic phase – observation of a new self-assembly pattern at the twist-bend nematic and the nematic interface

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Abstract

Flexoelectric properties – the effective flexoelectric coefficient and flexoelectric polarization – are investigated for a bimesogenic liquid crystal CBC11CB with a twist bend nematic phase (Ntb). Results show that the effective flexoelectric coefficient is at least two times higher than that for bimesogens that do not exhibit the Ntb phase. The flexoelectric polarization for the Ntb phase is also two times greater than that in the nematic phase. In a temperature gradient cell, we observe surprisingly a new phenomenon, in the bimesogens CBC7CB and CBC9CB and their mixtures with 5CB, of periodic self-assembly in the N phase close to the N–Ntb phase transition temperature. This phenomenon is reminiscent of the self-deformation and spontaneous chirality that appear in the system.

Graphical abstract: Flexoelectric behavior of bimesogenic liquid crystals in the nematic phase – observation of a new self-assembly pattern at the twist-bend nematic and the nematic interface

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Submitted
19 May 2014
Accepted
31 Jul 2014
First published
01 Aug 2014

J. Mater. Chem. C, 2014,2, 8179-8184
Article type
Paper
Author version available

Flexoelectric behavior of bimesogenic liquid crystals in the nematic phase – observation of a new self-assembly pattern at the twist-bend nematic and the nematic interface

R. Balachandran, V. P. Panov, Y. P. Panarin, J. K. Vij, M. G. Tamba, G. H. Mehl and J. K. Song, J. Mater. Chem. C, 2014, 2, 8179
DOI: 10.1039/C4TC01043D

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