In situ self-assembled photo-switchable liquid crystal alignment layer using azosilane monomer-liquid crystal mixture system

M. R. Vengatesan, Seung Ho Lee, Jong Ho Son, M. Alagar, Jang Kun Song

    Research output: Contribution to journalArticlepeer-review

    11 Scopus citations

    Abstract

    Self-assembled monolayers (SAMs) are a unique approach for the liquid crystal (LC) alignment in electro-optical applications such as displays. Herein, a new methodology for photo-switchable LC alignment layer using an azosilane monomer and LC mixture system in the absence of any other foreign alignment layer is presented. The azosilane monomer spontaneously separated from the host LCs, and formed a stable monolayer network on the substrate surface. Data from X-ray photo-electron spectroscopy (XPS), spectroscopic elipsometry (SE), water contact angle and LC alignment studies confirmed that, in the azosilane and LC mixture system, azosilane makes an in situ SAM that is capable of photo-switchable LC alignment layer on glass and indium tin oxide (ITO) substrates. The LCs are aligned with respect to change in the photo-isomerisation of the azo molecule.

    Original languageBritish English
    Pages (from-to)1227-1237
    Number of pages11
    JournalLiquid Crystals
    Volume40
    Issue number9
    DOIs
    StatePublished - Sep 2013

    Keywords

    • alignment layer
    • azo compounds
    • liquid crystal
    • photo-isomerisation
    • self-assembled monolayer

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