Nanoconfined heliconical structure of twist-bend nematic liquid crystal phase
| Autor: | Ra You, David M. Walba, Edward Guzman, Noel A. Clark, Hyungju Ahn, Eric Carlson, Dong Ki Yoon, Wongi Park, Min Jeong Shin, Seong Ho Ryu, Tae Joo Shin |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
010405 organic chemistry 02 engineering and technology General Chemistry Substrate (electronics) Conical surface 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Surface energy 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry Liquid crystal Phase (matter) Monolayer Aluminium oxide General Materials Science 0210 nano-technology Porosity |
| DOI: | 10.6084/m9.figshare.6979118.v1 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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