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Issue 44, 2016
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Mesoscale structure of chiral nematic shells

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There is considerable interest in understanding and controlling topological defects in nematic liquid crystals (LCs). Confinement, in the form of droplets, has been particularly effective in that regard. Here, we employ a Landau–de Gennes formalism to explore the geometrical frustration of nematic order in shell geometries, and focus on chiral materials. By varying the chirality and thickness in uniform shells, we construct a phase diagram that includes tetravalent structures, bipolar structures (BS), bent structures and radial spherical structures (RSS). It is found that, in uniform shells, the BS-to-RSS structural transition, in response to both chirality and shell geometry, is accompanied by an abrupt change of defect positions, implying a potential use for chiral nematic shells as sensors. Moreover, we investigate thickness heterogeneity in shells and demonstrate that non-chiral and chiral nematic shells exhibit distinct equilibrium positions of their inner core that are governed by shell chirality c.

Graphical abstract: Mesoscale structure of chiral nematic shells

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Article information

03 Jun 2016
10 Sep 2016
First published
12 Sep 2016

Soft Matter, 2016,12, 8983-8989
Article type

Mesoscale structure of chiral nematic shells

Y. Zhou, A. Guo, R. Zhang, J. C. Armas-Perez, J. A. Martínez-González, M. Rahimi, M. Sadati and J. J. de Pablo, Soft Matter, 2016, 12, 8983
DOI: 10.1039/C6SM01284A

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