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Issue 46, 2016
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Topological defects in cholesteric liquid crystal shells

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Abstract

We investigate experimentally and numerically the defect configurations emerging when a cholesteric liquid crystal is confined to a spherical shell. We uncover a rich scenario of defect configurations, some of them non-existent in nematic shells, where new types of defects are stabilized by the helical ordering of the liquid crystal. In contrast to nematic shells, here defects are not simple singular points or lines, but have a large structured core. Specifically, we observe five different types of cholesteric shells. We study the statistical distribution of the different types of shells as a function of the two relevant geometrical dimensionless parameters of the system. By playing with these parameters, we are able to induce transitions between different types of shells. These transitions involve interesting topological transformations in which the defects recombine to form new structures. Surprisingly, the defects do not approach each other by taking the shorter distance route (geodesic), but by following intricate paths.

Graphical abstract: Topological defects in cholesteric liquid crystal shells

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Publication details

The article was received on 30 Jul 2016, accepted on 29 Sep 2016 and first published on 29 Sep 2016


Article type: Paper
DOI: 10.1039/C6SM01748G
Citation: Soft Matter, 2016,12, 9280-9288
  • Open access: Creative Commons BY-NC license
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    Topological defects in cholesteric liquid crystal shells

    A. Darmon, M. Benzaquen, S. Čopar, O. Dauchot and T. Lopez-Leon, Soft Matter, 2016, 12, 9280
    DOI: 10.1039/C6SM01748G

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