Morphology of open films of discotic hexagonal columnar liquid crystals as probed by grazing incidence X-ray diffraction.

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.

DOI: 10.1140/epje/i2010-10586-2

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@article{Grelet2010MorphologyOO, title={Morphology of open films of discotic hexagonal columnar liquid crystals as probed by grazing incidence X-ray diffraction.}, author={Eric Grelet and S{\'e}bastien Dardel and Harald Bock and Michel Goldmann and Emmanuelle Lacaze and Fr{\'e}d{\'e}ric Nallet}, journal={The European physical journal. E, Soft matter}, year={2010}, volume={31 4}, pages={343-9} }