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SUMMARY:Diffusion of active particles in a complex environment strongly de
 pends on boundary conditions - Samuel Bell (University of Cambridge)
DTSTART:20180531T120000Z
DTEND:20180531T130000Z
UID:TALK106264@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:Upon collision with a circular obstacle\, pusher-like active p
 articles (e.g. bacteria\, Janus particles) temporarily glide along the sur
 face of the obstacle. They then leave the obstacle approximately at a tang
 ent to the surface. Microfluidic experiments have shown that bacteria appe
 ar to be guided by regular structures of such obstacles. Here we introduce
  a theoretical framework based on simulations of active (Brownian) particl
 es in a hexagonal lattice. We show that the observed guiding effect could 
 be a consequence of mere geometric constraints as opposed to more complica
 ted long-range hydrodynamic interactions\, and that for certain parameter 
 ranges\, large diffusion coefficients approaching the free space case are 
 possible even at high obstacle density. We contrast this with the Lorentz 
 gas\, where particles undergo billiard ball-like collisions.
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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