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Researchers achieved phase inversion of Pickering emulsions from water-in-oil to oil-in-water by creating an interfacial particle bilayer. This method utilizes electrostatic attraction between oppositely charged particles, offering tunable emulsion stability.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Pickering emulsions are stabilized by solid particles at the oil-water interface.
  • Phase inversion is a critical process for tailoring emulsion properties.
  • Controlling emulsion type (W/O vs. O/W) is essential for various applications.

Purpose of the Study:

  • To achieve phase inversion of Pickering emulsions from water-in-oil (W/O) to oil-in-water (O/W).
  • To investigate the mechanism of phase inversion using oppositely charged particles.
  • To demonstrate tunable emulsion stability through particle design.

Main Methods:

  • Emulsification using cationic silica-FITC particles in toluene to stabilize W/O emulsions.
  • Induction of phase inversion by adding anionic silica-RB particles to the aqueous phase.
  • Analysis of particle size, surface charge, pH, and salt concentration effects.
  • Characterization using Confocal Laser Scanning Microscopy (CLSM) and Scanning Electron Microscopy (SEM).
  • Evaluation of emulsion stability via osmotic pressure measurements and centrifugation.

Main Results:

  • Cationic silica particles (600 nm) stabilized W/O emulsions in toluene.
  • Addition of anionic silica-RB particles (1.0 wt % or higher) induced phase inversion.
  • Smaller anionic silica-RB particles (100 nm) induced inversion at lower concentrations (0.4 wt %).
  • Interfacial particle bilayers were visualized using CLSM and SEM.
  • Electrostatic attraction mechanism confirmed by tuning surface charge density.
  • Emulsion stability was successfully tuned.

Conclusions:

  • Phase inversion of Pickering emulsions can be achieved by forming an interfacial particle bilayer via electrostatic attraction.
  • The size and surface charge density of particles are key parameters for controlling phase inversion and emulsion stability.
  • This study provides a mechanism for tunable Pickering emulsion stabilization.