Cylindrical nematic liquid crystal shell: effect of saddle-splay elasticity

This study introduces cylindrical nematic liquid crystal (LC) shells. Shells as confinement can provide soft matter with intriguing topology and geometry. Indeed, in spherical shells of LCs, rich defect structures have been reported. Avoiding the inherent Plateau-Rayleigh instability of cylindrical...

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Bibliographic Details
Published in:Soft matter 2018-11, Vol.14 (44), p.9005-9011
Main Authors: Javadi, Arman, Eun, Jonghee, Jeong, Joonwoo
Format: Article
Language:English
Subjects:
Coexistence
Configurations
Cylindrical shells
Elastic properties
Interface stability
Interfaces
Liquid crystals
Modulus of elasticity
Nematic crystals
Phase separation
Shells
Spherical shells
Topology
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Summary:This study introduces cylindrical nematic liquid crystal (LC) shells. Shells as confinement can provide soft matter with intriguing topology and geometry. Indeed, in spherical shells of LCs, rich defect structures have been reported. Avoiding the inherent Plateau-Rayleigh instability of cylindrical liquid-liquid interfaces, we realize the cylindrical nematic LC shell by two different methods: the phase separation in the nematic-isotropic coexistence phase and a cylindrical cavity with a glass rod suspended in the middle. Specifically, the director configurations of lyotropic chromonic LCs (LCLCs) in the cylindrical shell and their energetics are investigated theoretically and experimentally. Unusual elastic properties of LCLCs, i.e., a large saddle-splay modulus, and a shell geometry with both concave and convex curvatures, result in a double-twist director configuration.
ISSN:1744-683X
1744-6848
DOI:10.1039/c8sm01829d