A functionally separated nanoimprinting material tailored for homeotropic liquid crystal alignment |
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Authors: | Gwag Jin Seog Oh-E Masahito Kim Kwang-Ryul Cho Sung-Hak Yoneya Makoto Yokoyama Hiroshi Satou Hiroyuki Itami Setsuo |
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Affiliation: | Liquid Crystal Nano-System Project, ERATO-SORST, Japan Science and Technology Agency, Tokodai, Tsukuba, Ibaraki 300-2635, Japan. |
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Abstract: | In order to homeotropically align liquid crystals (LCs) at the nanosized surface grooves processed by nanoimprint lithography technology (NIL), we propose to design a hybrid-type homeotropic polymer material consisting of two distinct moieties with largely different thermo-mechanical properties and surface activity. Surface contact angle measurements and sum-frequency vibrational spectroscopy allow us to conclude that the polymer film is a functionally separated composite suitable for the homeotropic LC alignment processed by NIL. As one of the potential applications using the hybrid-type homeotropic polymer, we demonstrate that the nanoimprinted grooves at the polymer surface can achieve a zenithal nematic LC bistability. |
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