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Proceedings Paper

Molecular stacking of discotic liquid crystals on the surfaces treated by O2 plasma
Author(s): Wenjun Zheng; Ya-Ting Hu; Cheng-Yan Chiang; Chi Wi Ong
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Paper 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.

Paper Details

Date Published: 27 August 2008
PDF: 8 pages
Proc. SPIE 7050, Liquid Crystals XII, 705012 (27 August 2008); doi: 10.1117/12.793517
Show Author Affiliations
Wenjun Zheng, National Sun Yat-Sen Univ. (Taiwan)
Ya-Ting Hu, National Sun Yat-Sen Univ. (Taiwan)
Cheng-Yan Chiang, National Sun Yat-Sen Univ. (Taiwan)
Chi Wi Ong, National Sun Yat-Sen Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7050:
Liquid Crystals XII
Iam Choon Khoo, Editor(s)

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