Morphology of open films of discotic hexagonal columnar liquid crystals as probed by grazing incidence X-ray diffraction |
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Authors: | Eric Grelet Sébastien Dardel Harald Bock Michel Goldmann Emmanuelle Lacaze and Frédéric Nallet |
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Institution: | 1.Centre de Recherche Paul-Pascal,Université de Bordeaux,Pessac,France;2.Insitut des Nanosciences de Paris,Universités Paris 6 et 7,Paris,France;3.Université Paris 5 René Descartes,Paris Cedex 06,France |
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Abstract: | The structure and the orientation of thermotropic hexagonal columnar liquid crystals are studied by grazing incidence X-ray
diffraction (GIXD) for different discotic compounds in the geometry of open supported thin films. Whatever the film deposition
mode (either spin-coating or vacuum evaporation) and the film thickness, a degenerate planar alignment with the liquid crystalline
columns parallel to the substrate is found. However, if a specific thermal process is applied to the liquid crystal film,
homeotropic anchoring (columns normal to the interface) can be stabilized in a metastable state. |
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