Control of surface anchoring properties of liquid crystal by thermo-transfer printing of siloxane oligomers |
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| Authors: | Jeng-Hun Suh Jiyoon Kim Yong-Sang Ryu Youngjoo Sohn |
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| Affiliation: | 1. School of Electrical Engineering, Seoul National University, Seoul 151-600, Korea;2. Department of Anatomy, College of Korean Medicine, Kyung Hee University, Seoul 130-701, Korea |
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| Abstract: | We presented the results for the surface anchoring properties of a nematic liquid crystal (LC) in a wide range of the substrate wettability through thermo-transfer printing of siloxane oligomers. For the modification of the surface energy, poly(dimethylsiloxane) (PDMS) oligomers were directly transferred onto a glass substrate from a bulk PDMS plate by contact printing at elevated temperatures. The hydrophobicity of the PDMS-modified surface was found to increase with the temperature of the substrate during transfer printing. The LC alignment on the PDMS-modified substrate exhibited continuous variations of the pretilt angle from nearly 0° to 90° and the polar anchoring strength according to the surface energy. |
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| Keywords: | liquid crystal alignment pretilt angle thermo-transfer printing poly(dimethylsiloxane) |
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