Liquid crystal alignment induced by controllable surface wettability of BiFeO3 bumps thin layer |
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| Authors: | Yang Liu Kaihua Liu Pushan Wen Byeong-Yun Oh Hong-Gyu Park |
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| Institution: | 1. Information Display Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Republic of Korea;2. Department of Materials Science and Engineering, Yonsei University, Seoul, Republic of Korea;3. Department of Chemistry and Chemical Engineering, Zunyi Normal College, Zunyi, Republic of China;4. ZeSHTech Co., Ltd., Business Incubator, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea |
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| Abstract: | The alignment of liquid crystals (LCs) in LC-based optical devices determines the visual quality of devices, and a simple pretreatment is necessary for LC alignment. Here, we present a BiFeO3 (BFO) thin layer working as an alignment layer, homogeneously aligning LCs after a pre-thermal annealing treatment. Dramatic BFO bumps were observed during the thermal annealing process, and a corresponding enhancement in wettability was detected from measurement of tunable contact angles. LCs in the BFO bump thin layer sandwiched TN cell were found to be perfectly homogeneously aligned due to the enhanced anisotropy and wettability caused by the morphology change of the thin layer. |
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| Keywords: | Liquid crystals alignment BFO thermal annealing surface wettability |
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