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.
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Submitted on : Tuesday, May 11, 2010 - 2:06:50 PM
Last modification on : Tuesday, May 14, 2019 - 10:58:29 AM

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Eric Grelet, Sébastien Dardel, Harald Bock, M. Goldmann, Emmanuelle Lacaze, et al.. Morphology of open films of discotic hexagonal columnar liquid crystals as probed by grazing incidence X-ray diffraction. European Physical Journal E: Soft matter and biological physics, EDP Sciences: EPJ, 2010, 31, pp. 343-349. ⟨10.1140/epje/i2010-10586-2⟩. ⟨hal-00482771⟩

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