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SUMMARY:Active particles under soft and dynamic confinement - Thomas Speck
  (University of Stuttgart)
DTSTART:20250225T130000Z
DTEND:20250225T140000Z
UID:TALK225682@talks.cam.ac.uk
CONTACT:Sarah Loos
DESCRIPTION:Confining active particles has two intertwined consequences: i
 t changes the local arrangement of particles\, and particles exert forces 
 onto the confining boundary. I will present recent and ongoing work to cha
 racterize the behavior of active particles under confinement combining exp
 eriments using colloidal particles with simulations and dynamic mean-field
  theory. First\, I will discuss how active particles modulate forces betwe
 en a hard wall and a trapped probe particle\, opening strategies for micro
 rheological investigations of active media. In contrast to passive suspens
 ions\, such active depletants imply large repulsive forces governed by a p
 ronounced local structure. I will then discuss the behavior of active part
 icles if confined to a channel or annulus by soft forces as relevant for m
 any biological situations in which confinement is rather soft and flexible
 . Varying the propulsion speed and confinement strength\, we observe the f
 ormation of dynamic clusters and a reentrant transition into a uniform gas
 -like phase. Finally\, I will present some preliminary results on immersed
  bodies that undergo cyclic shape changes.\n
LOCATION:Center for Mathematical Sciences\, Lecture room MR4
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