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    "Surface ordering of discotik liquid crystals"

    Authors
    Bellier-Castella, L.
    Caprion, D.
    Ryckaert, J.-P.
    Discipline
    Earth and related Environmental sciences
    Subject
    liquid crystal/air interfaces
    semifluorinated alkane C18H37–C12F25
    alkane
    Temperatures
    cyanobiphenyl liquid crystals
    C18H37–C12F25 Contentration in the liquid crystal bulk phase
    nematic–isotropic
    r smectic–isotropic transition
    Audience
    General Public
    Scientific
    Date
    2004
    Publisher
    IRM
    KMI
    RMI
    Metadata
    Show full item record
    Description
    We study the surface ordering and anchoring behaviour at liquid crystal/air interfaces laden with the semifluorinated alkane C18H37–C12F25. On alkanes, the semifluorinated alkane is known to form Gibbs films exhibiting a sharp transition from a dilute state at higher temperatures to a dense state at lower temperatures. We observe a similar transition in Gibbs films of this compound on the surface of cyanobiphenyl liquid crystals. The transition temperature can be tuned by controlling the C18H37–C12F25 concentration in the liquid crystal bulk phase. Our results show that the transition in the Gibbs film changes the anchoring of the liquid crystal from homeotropic at higher temperatures to planar at lower temperatures. When the transition temperature of the Gibbs film is tuned so that it takes place above the nematic–isotropic or smectic–isotropic transition of the liquid crystals, a pronounced effect on the nematic or smectic surface order is observed. Our study demonstrates for the first time that the ordering and anchoring behaviour of thermotropic liquid crystals can be tuned at a liquid crystal/air interface.
    Citation
    Bellier-Castella, L.; Caprion, D.; Ryckaert, J.-P. (2004). "Surface ordering of discotik liquid crystals". , Issue J. Chem. Phys 121, 4874 (2004), IRM,
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/8565
    Type
    Article
    Peer-Review
    Not pertinent
    Language
    eng
    Links
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