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SUMMARY:From Droplets to Bridges: Nucleation and Growth of Chemically Acti
 ve Droplets - Noah Ziethen\, DAMTP/Max Planck Institute\, for Dynamics and
  Self-Organization
DTSTART:20251021T120000Z
DTEND:20251021T130000Z
UID:TALK238954@talks.cam.ac.uk
CONTACT:Tal Agranov
DESCRIPTION:Driven chemical reactions can control the macroscopic properti
 es of droplets\, like their size. Such active droplets are critical in str
 ucturing the interior of biological cells. When bridging two structures\, 
 such droplets generate capillary forces\, which depend on surface properti
 es and distance. Understanding these forces in the presence of active chem
 ical reactions requires determining how chemical reactions alter both drop
 let nucleation\, which controls the onset of force\, and the forces themse
 lves.\nHere\, we employ an equilibrium surrogate model\, which reveals tha
 t reactions increase the effective energy barrier of nucleation\, enabling
  quantitative predictions of the increased nucleation times. Once bridges 
 form\, we demonstrate that reactions control the radius of the bridge. Thi
 s ultimately leads to purely repulsive forces\, which contrasts with the t
 ypically attractive forces in passive systems. Our results reveal how chem
 ical activity can fundamentally alter forces generated by liquid bridges\,
  which could be exploited by cells.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4.
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