Dynamic Evolution of Topological Defects around Drops and Bubbles Rising in a Nematic Liquid Crystal

Details Dynamic Evolution of Topological Defects around Drops and Bubbles Rising in a Nematic Liquid Crystal Dynamic Evolution of Topological Defects around Drops and Bubbles Rising in a Nematic Liquid Crystal

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrvl..99w7802k&link_type=abstract

Physical Review Letters, vol. 99, Issue 23, id. 237802

Mathematics

Logic

3

Defects In Liquid Crystals, Drops And Bubbles, Flows Of Liquid Crystals

Scientific paper

We report observations of topological defects around drops and bubbles that rise through a vertically aligned nematic liquid crystal. We provide direct evidence for downstream convection of the Saturn-ring defect and its transformation to a hyperbolic point defect. The point defect is convected further in the wake of the drop or bubble as the rising velocity increases. In equilibrium, both defect configurations may persist for long times in the narrow cell. But the point defect sometimes spontaneously opens into a Saturn ring, indicating the latter as the globally stable configuration in the presence of tight wall confinement.

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