Surface structures of hybrid aligned liquid crystal network coatings containing reverse tilt domains

Greta Babakhanova, Albert P.H.J. Schenning, Dirk J. Broer, Oleg D. Lavrentovich

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

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Samenvatting

Controlled shape changes of polymerized liquid crystalline coatings is often achieved via prepatterning the molecular orientation of liquid crystal (LC) monomers at the stage of preparation. In this work, using the so-called hybrid alignment of the LC, we produce surface structures of positive Gaussian curvature of coatings without complex techniques such as photoalignment. A mixture of LC monomers coated onto a glass plate with planar alignment of the director is exposed to air, which promotes vertical alignment. The competing planar and homeotropic boundary conditions result in a) thickness dependent director and b) spontaneous formation of spindle-like regions, limited by disclination loops, that are called the reverse tilt domains (RTDs). The disclination separates different director configurations inside and outside the RTD. The RTDs produce relatively big protrusions (100-600 nm) of the LC network coating. Actuation of the coating by heat increases the amplitude of RTD protrusions.

Originele taal-2Engels
TitelEmerging Liquid Crystal Technologies XIV
RedacteurenIgor Musevic, Liang-Chy Chien, Byoungho Lee, Dirk J. Broer
Plaats van productieBellingham
UitgeverijSPIE
Aantal pagina's6
ISBN van elektronische versie9781510625242
DOI's
StatusGepubliceerd - 1 jan 2019
EvenementEmerging Liquid Crystal Technologies XIV 2019 - San Francisco, Verenigde Staten van Amerika
Duur: 3 feb 20195 feb 2019

Publicatie series

NaamProceedings of SPIE
Volume10941

Congres

CongresEmerging Liquid Crystal Technologies XIV 2019
LandVerenigde Staten van Amerika
StadSan Francisco
Periode3/02/195/02/19

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