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How liquid-liquid phase separation induces active spreading.

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Summary
This summary is machine-generated.

Phase separation in spreading droplets defies traditional wetting laws, driven by an active spreading force. Nucleation occurs earlier than expected in the precursor film due to evaporation and surface forces.

Keywords:
moving contact linemulticomponent dropletphase separationsurface forcewetting

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Phase separation and wetting are critical in natural and technological processes.
  • Sessile droplets show microdroplet nucleation at contact lines during static phase separation.
  • Dynamic wetting during phase separation in spreading droplets remains poorly understood.

Purpose of the Study:

  • Investigate the coupling between liquid-liquid phase separation and dynamic wetting in spreading droplets.
  • Determine the applicability of classical wetting laws in nonequilibrium conditions.
  • Identify the mechanisms driving early nucleation and wetting transitions.

Main Methods:

  • Observation of liquid-liquid phase separation in spreading droplets.
  • High-speed ellipsometry to analyze dynamic wetting and nucleation.
  • Theoretical analysis of contact line dynamics and surface forces.

Main Results:

  • Phase separation actively couples with and influences the spreading motion of three-phase contact lines.
  • The classical Cox-Voinov law is insufficient due to an additional active spreading force.
  • Spreading initiates before visible microdroplet nucleation in the main droplet.
  • Evaporation-induced enrichment and surface forces cause premature nucleation in the wetting precursor film.

Conclusions:

  • Liquid-liquid phase separation significantly alters dynamic wetting behavior.
  • New insights into nonequilibrium wetting phenomena involving phase separation.
  • Findings have implications for oil recovery, inkjet printing, material synthesis, and biomolecular condensates.