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SUMMARY:Emerging patterns of phoretic active matter: from crystalline soli
 ds to active turbulence - Lailai Zhu (National University of Singapore)
DTSTART:20240611T110000Z
DTEND:20240611T113000Z
UID:TALK214654@talks.cam.ac.uk
DESCRIPTION:Co-authors: Qianhong Yang\, Maoqiang Jiang\, and Francesco Pic
 ano\nPhoretic microswimmers\, such as Janus colloids and isotropic active 
 droplets\, are promising constituents for self-organized active materials.
  However\, the underlying mechanisms governing their self-organization rem
 ain unclear\, despite numerous experimental observations in various regime
 s. Here\, we perform large-scale simulations to investigate a paradigmatic
  suspension of isotropic phoretic disks representing active droplets\, exp
 licitly resolving their many-body\, long-range hydrochemical interactions.
  We observe that they exhibit diverse collective phenomena\, including the
  formation of crystalline solids resembling Wigner crystals\, melting\, ga
 s-like chain formation\, active transition and turbulence. Our work reprod
 uces and reconciles seemingly conflicting experimental observations on che
 mically active systems\, emphasizing the importance of incorporating full 
 physicochemical hydrodynamics. Remarkably\, altering activity alone induce
 s solid-fluid phase transition and\, subsequently\, the laminar-turbulent 
 transition of the fluid. These two progressively emerging transitions\, hi
 therto unreported\, bring us closer to perceiving the parallels between ac
 tive matter and traditional matter. Our findings will help enhance the und
 erstanding of long-range\, many-body interactions among phoretic agents\, 
 offer new insights into non-equilibrium collective behaviors\, and provide
  potential guidelines for designing reconfigurable materials.
LOCATION:Seminar Room 1\, Newton Institute
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