Effect of ion beam irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals on polyimide surfaces

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3033380· OSTI ID:21185968

Lee, Kang-Min; Oh, Byeong-Yun; Kim, Young-Hwan; Seo, Dae-Shik ^[1]

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1. Department of Electrical and Electronic Engineering, Information Display Device Laboratory, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749 (Korea, Republic of)

We investigated the effects of ion beam (IB) irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals (LCs) on polyimide (PI) surfaces. We found that the LC direction follows the IB irradiation alignment direction on the PI surface regardless of whether the irradiation occurs before or after rubbing. We assumed that the LC direction depends strongly on the C-O bonds created from C=O bonds on the PI surface broken by IB irradiation and conducted an investigation of the chemical bonding state of the PI surface by x-ray photoelectron spectroscopy.

• OSTI ID: 21185968
• Journal Information: Journal of Applied Physics, Vol. 105, Issue 1; Other Information: DOI: 10.1063/1.3033380; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL BONDS
ION BEAMS
IRRADIATION
LIQUID CRYSTALS
POLYMERS
X-RAY PHOTOELECTRON SPECTROSCOPY