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Hydrodynamics-Induced Long-Range Attraction between Plates in Bacterial Suspensions.

Luhui Ning1,2,3, Xin Lou2,3, Qili Ma1

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Bacterial suspensions create long-range attraction between parallel plates, driven by bacterial flow fields. This hydrodynamic effect, crucial in active baths, offers new ways to control self-assembly.

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Area of Science:

  • Soft matter physics
  • Biophysics
  • Fluid dynamics

Background:

  • Understanding interactions in active matter systems is crucial.
  • Bacterial suspensions represent a model active bath.

Purpose of the Study:

  • To investigate the effective interactions between parallel plates in bacterial suspensions.
  • To elucidate the mechanisms driving these interactions and their dependence on bacterial density and plate separation.

Main Methods:

  • Optical-tweezers experiments were conducted to measure forces between plates.
  • Mesoscale fluid simulations were employed to model bacterial hydrodynamics and interactions.

Main Results:

  • A long-range attractive force between parallel plates was observed.
  • This attraction scales linearly with bacterial density and inversely with the square of plate separation.
  • The primary driver identified was the bacterial flow field, not direct collisions.

Conclusions:

  • Hydrodynamics significantly influence effective forces between passive objects in active baths.
  • Bacterial flow fields are key to generating long-range attractions.
  • Findings provide insights for controlling activity-directed assembly.