Structure and polarity of 8CB filmsevaporated onto solid substrates |
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Authors: | I.?Dreven?ek Olenik mailto:irena.drevensek@ijs.si" title=" irena.drevensek@ijs.si" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,K.?Ko?evar,I.?Mu?evi?,Th.?Rasing |
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Affiliation: | (1) Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI 1000 Ljubljana, Slovenia;(2) J. Stefan Institute, Jamova 39, SI 1000 Ljubljana, Slovenia;(3) Research Institute for Materials, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands |
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Abstract: | Brewster-angle reflection ellipsometry and surface opticalsecond harmonic generation were used to study the growth of4'-n-octyl-4-cyanobiphenyl(8CB) films evaporated in air onto polymeric and quartz glasssubstrates. The layer-by-layer growth of the films terminatesafter formation of two distinctive interfacial layers. Both ofthese two layers are polar and tilted. In the first layer themolecules lie nearly flat on the surface, while in the secondlayer they point on average about 50° toward the surface normal.The dipole moment of the second layer has a lower magnitude andan opposite direction with respect to the dipole moment of thefirst layer. |
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Keywords: | 61.30.Hn Surface phenomena: alignment, anchoring,anchoring transitions, surface-induced layering, surface-inducedordering, wetting, prewetting transitions, and wettingtransitions 68.03.Fg Evaporation and condensation 42.65.Ky Frequency conversion harmonic generation,including higher-order harmonicgeneration |
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