期刊
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
卷 66, 期 11, 页码 1711-1714出版社
KOREAN PHYSICAL SOC
DOI: 10.3938/jkps.66.1711
关键词
Bent-core liquid crystal; Surface adsorption; Homeotropic orientation
资金
- National Research Foundation of Korea (NRF) - ministry of Science, ICT & Future Planning [NRF-2013R1A1A1058681]
- Brain Korea 21 PLUS Project
We reported the promotion of a homeotropic alignment of a nematic liquid crystal (NLC) by bent-core liquid-crystal (BLC) Molecules adsorbed its surface. The BLC was mixed at various concentrations with the NLC, and the mixtures were injected into an empty cell with a cell gap of 13 mu m. Although the pure NLC showed a heterogeneous orientation, the BLC-NLC mixture was gradually transformed to a homeotropic alignment with increasing concentration of the BLC. We investigated the surface topography of the samples by using an atomic force microscopy (AFM) and found that the BLC molecules were segregated into a polyimide (PI) surface and formed protrusion domains with diameters of 50-100 nm. The BLC protrusions might promote the homeotropic orientation of the NLC molecules.
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