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Janus particles with distinct hydrophobic and hydrophilic sides enable stable millimeter-size Pickering emulsions. Particle size and wettability control emulsion drop size and stability, with smaller, balanced particles yielding the most stable emulsions.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Microfluidics

Background:

  • Pickering emulsions are stabilized by solid particles at interfaces.
  • Janus particles offer tunable interfacial properties due to their distinct surface chemistries.
  • Controlling particle properties is key to tailoring emulsion characteristics.

Purpose of the Study:

  • To demonstrate the synthesis of millimeter-size Janus particles for Pickering emulsion stabilization.
  • To investigate the influence of Janus particle size and wettability on emulsion properties.
  • To understand the mechanisms governing particle-stabilized emulsion formation and stability.

Main Methods:

  • Synthesis of Janus particles using glass capillary microfluidics.
  • Fabrication of Janus particles with controlled size (128–440 μm) and wettability (hydrophilic-to-hydrophobic ratio 0.36–12.77).
  • Characterization of emulsion stability using centrifugation and visual observation.

Main Results:

  • Janus particle size directly controls emulsion drop size.
  • Emulsion stability is maximized with smaller particles and a balanced hydrophilic-hydrophobic ratio.
  • Increased hydrogel (hydrophilic) volume promotes particle jamming and nonspherical droplet formation.
  • Large Janus particles facilitate visualization and understanding of stabilization mechanisms.

Conclusions:

  • Millimeter-size Janus particles are effective stabilizers for water-in-oil and oil-in-water Pickering emulsions.
  • Tunable particle size and wettability provide control over emulsion structure and stability.
  • Understanding particle jamming and interfacial behavior is crucial for designing robust Pickering emulsions.