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SUMMARY:Active particles in complex fluids - Gwynn Elfring (University of 
 British Columbia)
DTSTART:20181008T120000Z
DTEND:20181008T130000Z
UID:TALK112045@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:Active particles are self-driven objects\, biological or other
 wise\, which convert stored or ambient energy into systematic motion. The 
 motion of small active particles in Newtonian fluids has received consider
 able attention\, with interest ranging from phoretic propulsion to biologi
 cal locomotion\, whereas studies on active bodies immersed in complex flui
 ds are comparatively scarce. A simple model for an active particle conside
 rs a sphere with an axisymmetric distribution of slip-velocities on its su
 rface\, known as the squirmer model. This model has been helpful in develo
 ping insights into the dynamics of both biological swimmers\, like Volvox 
 and Opalina\, and synthetic self-propelling colloids. In this talk we pres
 ent a theory for an active squirmer-type particle in a complex fluid\, and
  then discuss the effects of viscoelasticity and shear-thinning rheology i
 n the context of biological locomotion and the propulsion of colloidal Jan
 us particles.
LOCATION:MR13\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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