Nanoconfined heliconical structure of twist-bend nematic liquid crystal phase
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- Nanoconfined heliconical structure of twist-bend nematic liquid crystal phase
- You, Ra; Park, Wongi; Carlson, Eric; Ryu, Seong Ho; Shin, Min Jeong; Guzman, Edward; Ahn, Hyungju; Shin, Tae Joo; Walba, David M.; Clark, Noel A.; Yoon, Dong Ki
- Issue Date
- TAYLOR & FRANCIS LTD
- LIQUID CRYSTALS, v.46, no.2, pp.316 - 325
- We produced controlled heliconical structures of a twist-bend nematic (N-TB) liquid-crystal (LC) phase in nanoconfinement in a porous anodic aluminium oxide (AAO) film. The structural parameters of the N-TB 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 N-TB phase.
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