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Wetting of a solid surface by active matter.

P D Neta1, M Tasinkevych1, M M Telo da Gama1

  • 1Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal. pedrodidier@hotmail.com mtasinkevych@fc.ul.pt mmgama@fc.ul.pt csdias@fc.ul.pt and Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal.

Soft Matter
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This summary is machine-generated.

Active particles near a surface exhibit motility-induced phase separation, forming distinct liquid and vapor states. The study reveals complete wetting behavior, where film thickness diverges as the system approaches coexistence.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Active particles exhibit unique collective behaviors not seen in equilibrium systems.
  • Wetting phenomena describe how fluids interact with surfaces, crucial in various physical and chemical processes.
  • Understanding active matter at interfaces is key to controlling emergent properties.

Purpose of the Study:

  • To investigate the wetting behavior of repulsive active particles at a planar surface.
  • To characterize motility-induced phase separation and bulk coexistence in this system.
  • To analyze the formation and thickness of adsorbed liquid films.

Main Methods:

  • Utilized a lattice model to simulate repulsive active particles.
  • Employed a rejection-free Kinetic Monte Carlo method for simulations.
  • Introduced a particle-number-varying ensemble, analogous to the grand canonical ensemble.

Main Results:

  • Predicted and characterized motility-induced phase separation.
  • Determined bulk coexistence of dense liquid-like and dilute vapor-like steady states.
  • Observed divergent behavior in adsorbed film thickness, indicating complete wetting.

Conclusions:

  • The active particle system demonstrates complete wetting along the full coexistence curve.
  • Motility-induced phase separation is a key factor governing wetting in active matter.
  • The introduced ensemble provides a powerful tool for studying non-equilibrium systems.