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• W1858145493 abstract "Drops of active liquid crystal have recently shown the ability to self-propel, which was associated with topological defects in the orientation of active filaments [Sanchez et al., Nature 491, 431 (2013)]. Here, we study the onset and different aspects of motility of a three-dimensional drop of active fluid on a planar surface. We analyze theoretically how motility is affected by orientation profiles with defects of various types and locations, by the shape of the drop, and by surface friction at the substrate. In the scope of a thin drop approximation, we derive exact expressions for the flow in the drop that is generated by a given orientation profile. The flow has a natural decomposition into terms that depend entirely on the geometrical properties of the orientation profile, i.e., its bend and splay, and a term coupling the orientation to the shape of the drop. We find that asymmetric splay or bend generates a directed bulk flow and enables the drop to move, with maximal speeds achieved when the splay or bend is induced by a topological defect in the interior of the drop. In motile drops the direction and speed of self-propulsion is controlled by friction at the substrate." @default.
• W1858145493 created "2016-06-24" @default.
• W1858145493 creator A5020853360 @default.
• W1858145493 creator A5074553785 @default.
• W1858145493 date "2015-12-22" @default.
• W1858145493 modified "2023-10-14" @default.
• W1858145493 title "Motility of active fluid drops on surfaces" @default.
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• W1858145493 doi "https://doi.org/10.1103/physreve.92.062311" @default.
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