We investigate the self-propulsive motion of a drop containing an active polar field. The drop demonstrates spontaneous symmetry breaking from a uniform orientational order into a splay or bend instability depending on the types of active stress, namely, contractile or extensile, respectively. We develop an analytical theory of the mechanism of this instability, which has been observed only in numerical simulations. We show that both contractile and extensile active stresses result in the instability and self-propulsive motion. We also discuss asymmetry between contractile and extensile stresses and show that extensile active stress generates chaotic motion even under a simple model of the polarity field coupled with motion and deformation of the drop.
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Research Article| May 13 2019
Self-propulsion of an active polar drop
Special Collection: Chemical Physics of Active Matter
Natsuhiko Yoshinaga; Self-propulsion of an active polar drop. J. Chem. Phys. 14 May 2019; 150 (18): 184904. https://doi.org/10.1063/1.5090790
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