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SUMMARY:Spontaneous motion and deformation of a droplet driven by chemical
  reaction - Yoshinaga\, N (Tohoku University)
DTSTART:20130626T104500Z
DTEND:20130626T113000Z
UID:TALK45928@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Spontaneous motion has been attracting lots of attention in la
 st decades in nonlinear and nonequilibrium physics partially for its poten
 tial application to biological problems such as cell motility. Recently se
 veral model experiments showing spontaneous motion have been proposed in o
 rder to elucidate underlying mechanism of the motion. The systems in these
  works consist of relatively simple ingredients\, for instance oil droplet
 s in water\, but nevertheless the results show rich motion and deformation
  of the droplet. Importantly\, the system breaks symmetry and chooses one 
 direction of motion. In this work\, we theoretically derive a set of nonli
 near equations exhibiting a transition between stationary and motile state
 s starting from advection-reaction-diffusion equation driven away from an 
 equilibrium state due to chemical reactions. A particular focus is on how 
 hydrodynamic flow destabilizes an isotropic distribution of a concentratio
 n of chemicals. We also discuss a shape of the droplet. Due to self-propul
 sive motion and flow around the droplet\, a spherical shape becomes unstab
 le and it elongates perpendicular to the direction of motion. This fact wo
 uld imply that the self-propulsion driven by chemical reaction is characte
 rized as a pusher in terms of a flow field.\n
LOCATION:Seminar Room 1\, Newton Institute
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