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Nano-Engineering of New Photoreactive Materials Having Fluorine Units: Synthesis and Photoalignment of Liquid Crystals

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Author(s): Rasha Ata Alaa | Gurumurthy Hegde | Arun M Isloor | Boodappa Chandrakantha | Shridhar Malladi | M.M. Yusoff | Lachezar Komitov

Journal: Soft Nanoscience Letters
ISSN 2160-0600

Volume: 03;
Issue: 01;
Start page: 1;
Date: 2012;
Original page

Keywords: Liquid Crystals | Fluorine | Parallel | Perpendicular | Irradiation

ABSTRACT
In order to investigate the photoalignment mechanism of nematic liquid crystals on an oxadiazoles, new 1,3,4-oxadiazole having fluorine atoms as terminal, as well as sideways was synthesized. Linearly polarized UV light shined in these nano-layered films causes the preferential direction of the liquid crystal molecules either perpendicular (in the case of terminal fluoro substitution) or parallel (in the case of sideways fluorine substitution) to the polarized direction. A powerful indication about the relationship between molecular structure and alignment properties where just by changing fluorine atom can change the entire alignment direction is proposed. Such information is indispensable for the design and synthesis of photoalignment materials for liquid crystal displays of high quality.

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