Liquid Crystal Alignment on Ion-Beam-Treated Polyimide with a Long Alkyl Side Chain: Near Edge X-ray Absorption Fine Structure Spectroscopy Analysis

Autor:	Soo Won Hwang, Joo-Hong Seo, Dong Han Song, Jae Hoon Shin, Mi Hye Yi, Tae-Hoon Yoon, Jae Chang Kim
Rok vydání:	2009
Předmět:	chemistry.chemical_classification Materials science Ion beam Analytical chemistry XANES Surfaces Coatings and Films X-ray absorption fine structure Crystallography chemistry Liquid crystal Materials Chemistry Side chain Physical and Theoretical Chemistry Absorption (chemistry) Polyimide Alkyl
Zdroj:	The Journal of Physical Chemistry B. 113:2001-2005
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp809090h
Popis:	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 pi-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 pi-bonds of the polyimide created by the ion beam irradiation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f68e5190cd864441970e0c1f4ffd39d https://doi.org/10.1021/jp809090h Zobrazit plný text záznamu