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SUMMARY:From Wall-Climbing Active Colloids to self-assembly of Magnetotact
 ic Bacteria - Prof Cottin-Bizonne\, Université Lyon
DTSTART:20250523T150000Z
DTEND:20250523T160000Z
UID:TALK231577@talks.cam.ac.uk
CONTACT:Professor Grae Worster
DESCRIPTION:The observation of flocks of birds\, schools of fish\, and swa
 rms of bees reveals captivating examples of collective behavior in nature.
  Over the past decade\, physicists have unveiled intriguing features in su
 ch systems\, giving rise to both spectacular phenomena and fundamental que
 stions. In this presentation\, we will first explore active wetting phenom
 ena in a suspension of self-propelled Janus colloids near a vertical wall.
  While classical capillary rise is governed by equilibrium surface tension
 \, active fluids challenge this paradigm. We investigate whether analogous
  interfacial effects emerge in non-phase-separated active sediments\, unco
 vering how self-propulsion modifies wetting behavior.  By studying the int
 eraction between a non-phase-separated active sediment and a wall\, we unc
 over how self-propulsion alters wetting-like behavior\, offering insights 
 into the role of activity in interfacial processes. In the second part\, w
 e turn to magnetotactic bacteria— microswimmers equipped with intracellu
 lar magnetic nanoparticles\, enabling directed motion along magnetic field
 s. These bacteria exhibit dual sensitivity\, responding not only to magnet
 ic fields (magnetotaxis) but also to oxygen gradients (aerotaxis)\, which 
 drives them to form dense\, dynamic bands. We demonstrate how the interpla
 y of magnetic steering\, chemical gradients\, and hydrodynamic interaction
 s leads to rich self-organization.
LOCATION:MR2
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