Nematic liquid crystal alignment on chemical patterns

BRAMBLE, J. P., EVANS, S. D., HENDERSON, J. R., ANQUETIL, C., CLEAVER, D. J. and SMITH, N. J. (2007). Nematic liquid crystal alignment on chemical patterns. Liquid Crystals, 34 (9), 1059-1069.

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    Link to published version:: 10.1080/02678290701614665

    Abstract

    Patterned Self-Assembled Monolayers (SAMs) promoting both homeotropic and planar degenerate alignment of 6CB and 9CB in their nematic phase, were created using microcontact printing of functionalised organothiols on gold films. The effects of a range of different pattern geometries and sizes were investigated, including stripes, circles and checkerboards. EvanescentWave Ellipsometry was used to study the orientation of the liquid crystal (LC) on these patterned surfaces during the isotropic-nematic phase transition. Pretransitional growth of a homeotropic layer was observed on 1 ¹m homeotropic aligning stripes, followed by a homeotropic mono-domain state prior to the bulk phase transition. Accompanying Monte-Carlo simulations of LCs aligned on nano-patterned surfaces were also performed. These simulations also showed the presence of the homeotropic mono-domain state prior to the transition.

    Item Type: Article
    Additional Information: Copyright © 2007 Taylor & Francis Group, an informa business
    Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Materials and Fluid Flow Modelling Group
    Identification Number: 10.1080/02678290701614665
    Depositing User: Ann Betterton
    Date Deposited: 01 Oct 2007
    Last Modified: 21 Dec 2010 11:32
    URI: http://shura.shu.ac.uk/id/eprint/899

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