Molecular stacking of discotic liquid crystals on the surfaces treated by O2 plasma

Wenjun Zheng; Ya-Ting Hu; Cheng-Yan Chiang; Chi Wi Ong

doi:10.1117/12.793517

27 August 2008 Molecular stacking of discotic liquid crystals on the surfaces treated by O₂ plasma

Wenjun Zheng, Ya-Ting Hu, Cheng-Yan Chiang, Chi Wi Ong

Proceedings Volume 7050, Liquid Crystals XII; 705012 (2008) https://doi.org/10.1117/12.793517
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

Abstract

The effects of plasma surface treatment on molecular stacking of a discotic liquid crystal are studied. Glass substrates are bombarded by an obliquely incident O₂ plasma beam. Plasma treatment causes an increase in surface free energy of the substrates, and in addition, the oblique plasma beam generates a preferential direction on the surface processed. The configuration of the cell is found to be crucial to achieve alignment of the discotic columns, and in general, cells with anti-parallel configuration of substrates should be used to achieve uniform alignment of the columnar phase. Homeotropic alignment of dichotic columns can be produced on plasma treated glass substrates with high surface free energy. When the surface free energy of the substrate decreases, the axes of the discotic columns will tilt from the normal of the substrate and towards the preferential direction.

Citation Download Citation

Wenjun Zheng, Ya-Ting Hu, Cheng-Yan Chiang, and Chi Wi Ong "Molecular stacking of discotic liquid crystals on the surfaces treated by O₂ plasma", Proc. SPIE 7050, Liquid Crystals XII, 705012 (27 August 2008); https://doi.org/10.1117/12.793517

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