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J Reinhardt1, A Scacchi1, J M Brader1

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Investigating colloidal suspensions near a liquid-gas phase boundary reveals unique particle behaviors. Repulsive tracers cause cavitation bubbles, while attractive tracers form liquid trails, impacting fluid dynamics.

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Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Two-dimensional colloidal suspensions exhibit complex behavior near phase boundaries.
  • Tracer particle motion significantly influences local microstructure and rheology.
  • Understanding these interactions is crucial for soft matter system design.

Purpose of the Study:

  • To investigate the microstructural and microrheological response of a 2D colloidal suspension to a tracer particle.
  • To characterize cavitation phenomena and liquid trail formation near a liquid-gas phase boundary.
  • To calculate velocity-dependent friction for tracer particles in both liquid and gas phases.

Main Methods:

  • Simulations of a two-dimensional colloidal suspension near the liquid-gas binodal.
  • Analysis of tracer particle dynamics and resulting microstructural changes.
  • Calculation of colloidal cavitation number and velocity-dependent friction.

Main Results:

  • On the liquid side, repulsive tracers induce cavitation bubbles with depleted particle concentration.
  • A dimensionless colloidal cavitation number characterizes the tendency to cavitate.
  • On the gas side, attractive tracers create extended colloidal liquid trails via advection of wetting layers.

Conclusions:

  • Tracer particle velocity and interaction type dictate distinct microstructural responses near phase boundaries.
  • The study introduces a colloidal cavitation number for quantifying this phenomenon.
  • Velocity-dependent friction is determined for both repulsive and attractive tracer scenarios.