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dc.contributor.authorBellier-Castella, L.
dc.contributor.authorCaprion, D.
dc.contributor.authorRyckaert, J.-P.
dc.coverage.temporal21st century
dc.date2004
dc.date.accessioned2016-03-07T16:16:47Z
dc.date.accessioned2021-12-09T09:53:09Z
dc.date.available2016-03-07T16:16:47Z
dc.date.available2021-12-09T09:53:09Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/8565
dc.descriptionWe 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.
dc.languageeng
dc.publisherIRM
dc.publisherKMI
dc.publisherRMI
dc.relation.ispartofseriesJ. Chem. Phys 121, 4874 (2004)
dc.title"Surface ordering of discotik liquid crystals"
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceGeneral Public
dc.audienceScientific
dc.subject.freeliquid crystal/air interfaces
dc.subject.freesemifluorinated alkane C18H37–C12F25
dc.subject.freealkane
dc.subject.freeTemperatures
dc.subject.freecyanobiphenyl liquid crystals
dc.subject.freeC18H37–C12F25 Contentration in the liquid crystal bulk phase
dc.subject.freenematic–isotropic
dc.subject.freer smectic–isotropic transition
dc.source.issueJ. Chem. Phys 121, 4874 (2004)
Orfeo.peerreviewedNot pertinent


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