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Pickering Emulsions Stabilized with Millimeter-Sized Polymer Plates.

Rina Kakiuchi1, Yuri Sakurai1, Hikaru Manabe1

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Summary

Hexagonal polymer plates stabilize emulsions, with smaller plates improving formability. Oil polarity and plate pre-dispersion significantly influence emulsion type and droplet shape, affecting stability.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science

Background:

  • Emulsion stability is crucial in various industries.
  • Controlling emulsion properties requires understanding stabilizer-emulsion interactions.
  • Polymer micro/nanoparticles offer tunable properties for emulsion stabilization.

Purpose of the Study:

  • To investigate the impact of hexagonal polymer plate stabilizers on emulsion characteristics.
  • To correlate polymer plate size, oil polarity, and pre-emulsification dispersion with emulsion formability, type, and droplet morphology.
  • To establish relationships between droplet-to-stabilizer size ratios and resulting droplet shapes.

Main Methods:

  • Utilized uniform hexagonal polymer plates of (sub)millimeter size as emulsion stabilizers.
  • Systematically varied plate size, oil polarity, and the medium in which plates were dispersed before emulsification.
  • Analyzed emulsion formability, type (O/W vs. W/O), and droplet shapes under different conditions.

Main Results:

  • Decreasing polymer plate size enhanced emulsion formability.
  • Lower oil polarity favored oil-in-water (O/W) emulsions; increasing polarity promoted water-in-oil (W/O) emulsions.
  • High oil polarity led to emulsion failure or macrophase separation.
  • Plates pre-dispersed in oil exhibited increased lipophilicity compared to those dispersed in water.
  • Droplet shape correlated with the droplet-to-plate size ratio: >2 yielded spherical, 1-2 yielded polyhedral, and <1 yielded sandwich-shaped droplets.

Conclusions:

  • Hexagonal polymer plates effectively stabilize emulsions, with tunable properties based on size and polarity.
  • Emulsion type and stability are strongly dependent on oil polarity and plate pre-treatment.
  • The droplet-to-stabilizer size ratio is a key determinant of droplet morphology, enabling control over emulsion structure.