期刊
OPTICS EXPRESS
卷 26, 期 7, 页码 8385-8396出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.26.008385
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资金
- BK21 Plus Project through the National Research Foundation of Korea
The surface of multilayered opal crystals resulted in homeotropic alignment of liquid crystal (LC), originated from the surface topography of opal crystals rather than a chemical nature of the nanoparticles. The polar anchoring energy (5.51 x 10(-5) J/m(2)) of the crystal surface for nematic LC molecules was in a similar range to the conventional polyimide alignment layer (2.11 x 10(-5) J/m(2)) used for commercial applications. The critical length scale for anchoring transition was approximately L-w = similar to 1 mu m. If a diameter of particle d << 1 mu m for opal crystals, LC molecules preferred to anchor vertically to the surface to minimize elastic free energy of bulk LCs. The LC favored a planar anchoring if d >> 1 mu m. The results provide crucial insights to understand the homeotropic alignment of LCs on solid surfaces and therefore offer opportunities to develop novel materials for a vertical alignment of LCs. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
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