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Wetting Transitions Displayed by Persistent Active Particles.

Néstor Sepúlveda1, Rodrigo Soto1

  • 1Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Blanco Encalada 2008, Santiago, Chile.

Physical Review Letters
|September 27, 2017
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Summary
This summary is machine-generated.

Active matter models exhibit distinct wetting transitions on a wall. Increasing particle tumbling rates lead to changes from wetting films to droplets and finally to dry surfaces, revealing nonequilibrium phase transitions.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Active matter systems exhibit complex behaviors not seen in equilibrium systems.
  • Understanding phase transitions in active matter is crucial for predicting emergent phenomena.

Purpose of the Study:

  • To numerically investigate wetting transitions in a lattice model of active matter.
  • To characterize the different wetting phases and their transitions as a function of particle tumbling rate.

Main Methods:

  • Numerical simulation of a lattice model for active matter.
  • Analysis of particle distribution and phase behavior at an impenetrable wall.

Main Results:

  • Three distinct wetting phases were observed: total wetting, partial wetting with droplets, and unwetting (dry).
  • Transitions between these phases are driven by changes in the particle tumbling rate (α).
  • The transition from partial to total wetting is continuous, while the transition to the dry phase shows logarithmic divergence in droplet spacing.

Conclusions:

  • The study demonstrates novel nonequilibrium wetting transitions in active matter.
  • The tumbling rate is identified as a key parameter controlling wetting behavior and phase transitions.