Article (Scientific journals)
Topological Defect-Guided Regular Stacking of Focal Conic Domains in Hybrid-Aligned Smectic Liquid Crystal Shells
Noh, Junghyun; LAGERWALL, Jan
2021In Crystals, 11 (8), p. 913
Peer reviewed
 

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Abstract :
[en] We study liquid crystal (LC) shells in hybrid configuration (director tangential to the inside but normal to the outside) as they slowly undergo a transition from a nematic (N) to a smectic-A (SmA) phase. Every shell has two antipodal +1 topological defects, at the thinnest and thickest points, respectively. On cooling from N to SmA, the symmetry axis connecting the defects gradually reorients from blackalong gravity to perpendicular to it, reversibly and continuously, if the LC and aqueous phase are density matched at the N-SmA transition. This suggests reduced density near the defects---reflecting a local reduction in order---under the strong confinement with antagonistic boundary conditions. In the SmA phase, a regular array of focal conic domains (FCDs) develops, templated in position and orientation by the +1 defect at the thinnest point. Around this defect, a single complete toroidal FCD always develops, surrounded by incomplete FCDs. In contrast to similar FCD arrangements on flat aqueous interfaces, this is a stable situation, since the two +1 defects are required by the spherical topology. Our results demonstrate how the topological defects of LC shells can be used to template complex self-organized structures. blackWith a suitable adaption of the LC chemistry, shells might serve as a basis for producing solid particles with complex yet highly regular morphologies.
Disciplines :
Physics
Author, co-author :
Noh, Junghyun
LAGERWALL, Jan  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
External co-authors :
no
Language :
English
Title :
Topological Defect-Guided Regular Stacking of Focal Conic Domains in Hybrid-Aligned Smectic Liquid Crystal Shells
Publication date :
04 July 2021
Journal title :
Crystals
Special issue title :
Special issue In Celebration of Noel A. Clark’s 80th Birthday
Volume :
11
Issue :
8
Pages :
913
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
European Projects :
H2020 - 648763 - INTERACT - Intelligent Non-woven Textiles and Elastomeric Responsive materials by Advancing liquid Crystal Technology
FnR Project :
FNR6992111 - Ultrathin Liquid-crystal Shells For Smart Colloids, 2013 (15/04/2014-14/04/2018) - Junghyun Noh
Funders :
CE - Commission Européenne [BE]
FNR - Fonds National de la Recherche [LU]
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