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SUMMARY:Light-driven dynamics of a deformable microgel spiral and synchron
 isation of cilia in strong confinement - Ivan Tanasijevic (University of C
 ambridge)
DTSTART:20190606T120000Z
DTEND:20190606T130000Z
UID:TALK125314@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:The world of micro-organisms is filled with a variety of diffe
 rent swimming mechanisms which provide us with great insight into optimal 
 propulsion at low Reynolds numbers. One example of such a mechanism is the
  beating of eukaryotic cilia. In the first part of the talk\, we will look
  at the fabrication and light-actuation of a thermoresponsive polymer gel 
 spiral which allows it to mimic cilia and to deform in a periodic but a no
 n-reciprocal way. The breaking of the time-reversal symmetry produces a to
 rque on the ribbon immersed in a fluid and the ribbon rotates. After intro
 ducing the experiments\, done in collaboration with the group of Ahmed Mou
 rran from Aachen\, a simple mathematical model for the motion of this micr
 o-motor will be presented\, able to produce excellent agreement with the e
 xperimental data. The hydrodynamic interaction between two such micro-moto
 rs is the motivation for the work presented in the second part of this tal
 k where we consider a pair of cilia confined between two flat\, parallel w
 alls and investigate their synchronisation. Theoretical results will provi
 de us with a measure of robustness towards confinement of two widely accep
 ted mechanisms for cilia synchronisation – elasticity and force modulati
 on.
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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