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Particles' Organization in Direct Oil-in-Water and Reverse Water-in-Oil Pickering Emulsions.

Diego M Ramos1, Véronique Sadtler1, Philippe Marchal1

  • 1Laboratoire Réactions et Génie des Procédés (LRGP), UMR 7274 CNRS, Université de Lorraine, 1 Rue Grandville, 54001 Nancy, France.

Nanomaterials (Basel, Switzerland)
|February 11, 2023
PubMed
Summary
This summary is machine-generated.

The initial wetting of particles and oil viscosity significantly alter Pickering emulsion structure and rheology. Whether particles are dispersed in oil or water initially impacts emulsion properties, even with particles at interfaces.

Keywords:
Pickering emulsionsdirect emulsionsdodecaneparaffinreverse emulsionssilica

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Rheology

Background:

  • Pickering emulsions are stabilized by solid particles, offering unique properties.
  • Understanding particle-oil-water interactions is crucial for emulsion design.
  • The initial state of particle dispersion influences final emulsion characteristics.

Purpose of the Study:

  • To investigate how initial particle wetting and oil viscosity affect Pickering emulsion structure and rheology.
  • To compare direct (Oil/Water) and reverse (Water/Oil) Pickering emulsions.
  • To elucidate the role of particle dispersion phase on emulsion properties.

Main Methods:

  • Confocal microscopy and static light scattering for structural analysis.
  • Stress-controlled rheometry for flow and viscoelastic property evaluation.
  • Stabilization of dodecane/paraffin emulsions using partially hydrophobic silica particles.

Main Results:

  • Particle adsorption at interfaces was confirmed for all emulsions.
  • Emulsion structure and rheological behavior varied based on the initial particle dispersion phase (oil or water).
  • Particle concentration and oil viscosity were identified as key factors influencing these differences.

Conclusions:

  • Initial particle wetting is a critical factor in determining Pickering emulsion microstructure and macroscopic properties.
  • The phase in which particles are initially dispersed dictates emulsion type and performance.
  • Tailoring initial particle dispersion offers a route to control emulsion rheology and structure.