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Related Experiment Videos

Wetting-induced depletion interaction between particles in a phase-separating liquid mixture.

Takeaki Araki1, Hajime Tanaka

  • 1Institute of Industrial Science, University of Tokyo, Meguro-ku, Tokyo 153-8505, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 16, 2006
PubMed
Summary

Solid particles influence binary fluid phase separation. Immobile particles suppress domain growth, while mobile particles exhibit reentrant morphological transformations due to wetting-induced depletion interactions.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Fluid Dynamics

Background:

  • Phase separation in binary fluid mixtures is significantly altered by the presence of solid particles.
  • Preferential wetting of one fluid phase to particle surfaces is a key mechanism driving these alterations.

Purpose of the Study:

  • To investigate the impact of solid particles on the pattern evolution during binary fluid phase separation.
  • To elucidate the role of interparticle hydrodynamic interactions and wetting phenomena.

Main Methods:

  • Numerical simulations were employed to model the phase separation process.
  • The simulations incorporated interparticle hydrodynamic interactions and preferential wetting effects.

Main Results:

Related Experiment Videos

  • Particles favoring one phase become coated with wetting layers and are incorporated into that phase.
  • Immobile particles pin domains, suppressing growth, with domain size decreasing as particle concentration increases.
  • Mobile particles show a reentrant morphological transformation (network-droplet-network) with increasing concentration, driven by wetting-induced depletion interactions.

Conclusions:

  • Particle wettability dictates their incorporation into specific fluid phases.
  • Particle mobility and concentration critically influence phase separation morphology, with depletion interactions playing a key role in transitions for mobile particles.