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Controlling motile disclinations in a thick nematogenic material with an electric field

Bhattacharjee, Amit Kumar (2018) Controlling motile disclinations in a thick nematogenic material with an electric field. In: SCIENTIFIC REPORTS, 8 (2517).

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Official URL: http://dx.doi.org/10.1038/s41598-018-19891-0

Abstract

Manipulating topological disclination networks that arise in a symmetry-breaking phase transformation in widely varied systems including anisotropic materials can potentially lead to the design of novel materials like conductive microwires, self-assembled resonators, and active anisotropic matter. However, progress in this direction is hindered by a lack of control of the kinetics and microstructure due to inherent complexity arising from competing energy and topology. We have studied thermal and electrokinetic effects on disclinations in a three-dimensional nonabsorbing nematic material with a positive and negative sign of the dielectric anisotropy. The electric flux lines are highly nonuniform in uniaxial media after an electric field below the Freedericksz threshold is switched on, and the kinetics of the disclination lines is slowed down. In biaxial media, depending on the sign of the dielectric anisotropy, apart from the slowing down of the disclination kinetics, a nonuniform electric field filters out disclinations of different topology by inducing a kinetic asymmetry. These results enhance the current understanding of forced disclination networks and establish the presented method, which we call fluctuating electronematics, as a potentially useful tool for designing materials with novel properties in silico.

Item Type: Journal Article
Additional Information: Copy right for the article belong to NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 08 Mar 2018 19:07
Last Modified: 08 Mar 2018 19:07
URI: http://eprints.iisc.ac.in/id/eprint/59126

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