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Active particles like swimming bacteria explore obstacle boundaries, generating forces dependent on wall curvature. Bacteria are propelled from concave to convex surfaces, with speed linearly scaling with curvature.

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Area of Science:

  • Soft Matter Physics
  • Microbiology
  • Active Matter Physics

Background:

  • Active particles exhibit persistent dynamics, leading to complex boundary exploration during collisions.
  • The forces exerted by active particles on surfaces are influenced by geometric features like curvature.

Purpose of the Study:

  • To systematically investigate the forces exerted by swimming bacteria on microfabricated structures with variable curvature.
  • To understand how wall curvature influences the propulsion and dynamics of microswimmers.

Main Methods:

  • Experimental investigation of forces exerted by swimming bacteria on microfabricated structures.
  • Parametric variation of the radii of curvature of the microstructures.
  • Theoretical analysis of the collision problem for microswimmers with wall-induced torques.

Main Results:

  • Bacterial propulsion speed scales linearly with wall curvature.
  • Propulsion is directed from concave to convex sides along the axis of symmetry.
  • The force law for bacteria on curved surfaces simplifies to that of spherical active particles.

Conclusions:

  • Wall curvature is a critical factor governing the interaction dynamics of active particles with boundaries.
  • Bacteria exhibit unique propulsion mechanisms on curved surfaces, driven by wall geometry.
  • The study provides insights into fundamental active matter-surface interactions.