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Issue 35, 2018
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Linear defects forming the ground state of polar free standing smectic-C* films

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Abstract

In this paper we report on observations of unusual linear defects forming spontaneously in polar free-standing smectic-C* films near the temperatures of thinning transitions. At high temperature a periodic structure of defects becomes the ground state of the system. We found that the defects are characterized by continuous rotation of the molecular orientation with a change of the sense of the rotation across the defects. We develop a simple theoretical model that describes the observed behavior. The structure of the defects is governed by the competition between two-dimensional quadratic and linear orientational elasticity. The proposed model explains the origin of the linear defects, the periodic structure and their transformation with temperature and chirality of the liquid crystal.

Graphical abstract: Linear defects forming the ground state of polar free standing smectic-C* films

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Publication details

The article was received on 22 Jun 2018, accepted on 13 Aug 2018 and first published on 17 Aug 2018


Article type: Paper
DOI: 10.1039/C8SM01276H
Citation: Soft Matter, 2018,14, 7174-7179
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    Linear defects forming the ground state of polar free standing smectic-C* films

    P. V. Dolganov, E. I. Kats, V. K. Dolganov and P. Cluzeau, Soft Matter, 2018, 14, 7174
    DOI: 10.1039/C8SM01276H

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