Nanoconfined heliconical structure of twist-bend nematic liquid crystal phase

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We produced controlled heliconical structures of a twist-bend nematic (NTB) liquid-crystal (LC) phase in nanoconfinement in a porous anodic aluminium oxide (AAO) film. The structural parameters of the NTB phase such as conical angle and helical pitch can be modulated by varying the surface energy of the inner surface of the porous AAO film, done by using different self-assembled monolayers (SAMs). The LC molecules tend to be more freely packed, thus forming a larger conical angle, when placed on the tri-deca-fluoro-1,1,2,2-tetrahydrooctyl-trichlorosilane (FOTS)-treated substrate, which has a relatively low surface energy. In contrast, the molecules form a more tightly packed structure, and thus a smaller conical angle, when placed on the 2-(methoxy(polyethyleneoxy)-propyl)trimethoxysilane (PEG 6/9)-treated substrate, which has higher surface energy. This work improves our collective understanding of self-assembled heliconical structures in the NTB phase.
Publisher
TAYLOR & FRANCIS LTD
Issue Date
2019-04
Language
English
Article Type
Article
Citation

LIQUID CRYSTALS, v.46, no.2, pp.316 - 325

ISSN
0267-8292
DOI
10.1080/02678292.2018.1508770
URI
http://hdl.handle.net/10203/253956
Appears in Collection
NT-Journal Papers(저널논문)
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