Title: Swimming in Nematic Liquid Crystals

Speaker: Kate Stebe, University of Pennsylvania

Abstract: Purcell's scallop theorem, which requires non-reciprocal motions for translation in isotropic fluids, needs adjustment for swimmers in nematic liquid crystals (NLC). Unlike isotropic fluids, where complex, non-reciprocal motions are essential, symmetric motions can induce translation in NLC due to its anisotropic nature. In NLC, symmetric flows create broken symmetries and elastic stresses that drive motion, expanding the range of effective swim strokes. This study outlines the conditions for swimming at low Reynolds numbers in NLC and explores how colloidal swimmers can access far-from-equilibrium defect dynamics that enhance swimming efficiency. The research, in collaboration with Miha Ravnik's group, reveals new possibilities for effective swimming in NLC environments.

Special Note: Stephen H. Davis Lecture

Zoom: https://northwestern.zoom.us/j/97615086394

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