Liquid Crystal Alignment on Ion-Beam-Treated Polyimide with a Long Alkyl Side Chain: Near Edge X-ray Absorption Fine Structure Spectroscopy Analysis
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- 作者：Joo-Hong Seo ; Soo Won Hwang ; Dong Han Song ; Jae Hoon Shin ; Tae-Hoon Yoon ; Jae Chang Kim* ; Mi Hye Yi
- 刊名：Journal of Physical Chemistry B
- 出版年：2009
- 出版时间：February 19, 2009
- 年：2009
- 卷：113
- 期：7
- 页码：2001-2005
- 全文大小：156K
- 年卷期：v.113,no.7(February 19, 2009)
- ISSN：1520-5207
文摘
Liquid crystal alignment on ion-beam-treated polyimides with a long alkyl side chain was investigated using near edge X-ray absorption fine structure (NEXAFS) spectroscopy. The long alkyl side chains and the asymmetric distribution and orientational order of the π-bonds of the polyimide surface can be determined by analyzing the angular dependent resonance intensities of the NEXAFS measurements. Herein, we demonstrate that the pretilt angle of the LC cell made by our method decreases as more long alkyl side chains are destroyed. Additionally, the tilt direction of the LC molecules can be determined from the asymmetric distribution of π-bonds of the polyimide created by the ion beam irradiation.