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Aging mechanism in model Pickering emulsion.

Sarah Fouilloux1, Florent Malloggi, Jean Daillant

  • 1Interdisciplinary Laboratory on Nanoscale and Supramolecular Organizations, CEA-Saclay, IRAMIS/NIMBE/LIONS, UMR CNRS 3685, Gif-sur-Yvette, France. florent.malloggi@cea.fr.

Soft Matter
|November 10, 2015
PubMed
Summary
This summary is machine-generated.

This study explores Pickering emulsion stability using functionalized silica nanoparticles and fluorinated oil. We found a new stability regime at low nanoparticle coverage, challenging previous models of droplet size control.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Fluid Dynamics

Background:

  • Pickering emulsions are stabilized by solid nanoparticles at the oil-water interface.
  • Understanding nanoparticle wettability and surface coverage is crucial for emulsion stability.
  • Previous models suggested limited coalescence dictates droplet size based on surface coverage.

Purpose of the Study:

  • To investigate the stability of a model Pickering emulsion system.
  • To explore the role of nanoparticle wettability and surface coverage on emulsion formation and stability.
  • To re-evaluate existing models of emulsion stability in light of new experimental observations.

Main Methods:

  • Utilized a specialized counter-flow microfluidic setup for precise droplet generation.
  • Employed functionalized silica nanoparticles (NPs) with tunable wettability.
  • Systematically varied nanoparticle surface coverage and observed emulsion droplet behavior over time.

Main Results:

  • Achieved monodisperse oil droplets in water stabilized by silica nanoparticles.
  • Identified a novel Pickering emulsion stability regime at surface coverages as low as 23%.
  • Observed increasing droplet surface coverage over time with constant droplet size, coexisting with excess oil.

Conclusions:

  • The observed stability regime provides a broader perspective beyond the limited coalescence model.
  • Nanoparticle surface coverage and wettability significantly influence Pickering emulsion stability.
  • This work advances the understanding of nanoparticle-stabilized emulsions for potential applications.