Featured Liquid Crystal Picture Art of the Month
Observation of an orientational transition of a conventional nematic liquid crystal, 4'-butyl-4-heptyl-bicyclohexyl-4-carbonitrile (CCN-47), in the nematic phase was made by using a polarizing optical microscope with a 10x objective. The substance is confined in a wedge cell upon a cooling procedure. The texture was taken at the transition temperature, at which a discontinuos variation in the orientation of director, from planar to homeotropic state, occurs. The picture width is approx. 860 µm. More details can be found in the paper by ACS, DOI: 10.1021/acs.langmuir.6b03112.
This is not just a simple Schlieren texture with beautiful color gradation. Double-step surface-orientation transition brings about formation of some interesting patterns of sharp color changes.
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