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Periodic pattern formation in an achiral bent core nematic

Journal article
Authors Omaima Abubakr Elamain
G. Hegde
Lachezar Komitov
Published in Aip Advances
Volume 8
Issue 9
ISSN 2158-3226
Publication year 2018
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1063/1.5040566
Keywords banana-shaped mesogens, liquid-crystals, physical-properties, rod-like, molecules, phases, curvature, monomers, order, Science & Technology - Other Topics, Materials Science, Physics
Subject categories Physical Sciences

Abstract

We investigated a periodic flexoelectric domain pattern, which appeared as regular parallel stripes in an achiral bent core nematic liquid crystal when dc electric field was applied. We found that such a pattern was first formed at the substrate surface and took place in sandwich cells with a gap larger than 2 mu m. The field-induced periodic pattern was preserved in the field-off state by a polymer network formed in the cell and was found to exhibit a polar as well as a linear electro-optic response due to in-plane switching of the sample optic axis. A comparison between this response and the one obtained in short cholesteric liquid crystals, aligned in ULH (uniform lying helix) texture, and short pitch ferroelectric liquid crystals, respectively, suggested that a heliconical molecular order is most probably formed in the field-induced periodic stripe pattern, with the helix axis orthogonal to the stripes. To our knowledge, this is the first experimental evidence of field-induced chiral-symmetry breaking in the flexoelectric periodic stripe pattern in achiral bent core nematic, resulting in heliconical molecular order, resembling the one of twist-bend (TB) nematic phase in this kind of nematics. (C) 2018 Author(s).

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