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Related Experiment Video

Updated: Jul 20, 2026

Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles
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Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles

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Nanoparticle encapsulation of emulsion droplets.

Clive A Prestidge1, Spomenka Simovic

  • 1Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia. clive.prestidge@unisa.edu.au

International Journal of Pharmaceutics
|August 26, 2006
PubMed
Summary

This study coats emulsion droplets with silica nanoparticles to enhance stability and control release. Hydrophobic nanoparticle coatings provide sustained release of dibutyl phthalate (DBP), demonstrating potential for controlled delivery applications.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Emulsion stabilization and controlled release are critical in various industries.
  • Nanoparticle coatings offer tunable interfacial properties for emulsions.
  • Understanding nanoparticle adsorption and interfacial layer formation is key.

Purpose of the Study:

  • To coat emulsion droplets with silica nanoparticles via heterocoagulation.
  • To investigate adsorption behavior, interfacial microstructure, and physical stability.
  • To determine the release profile of a model lipophilic molecule (dibutyl phthalate).

Main Methods:

  • Utilized polydimethylsiloxane (PDMS) droplets and Aerosil silica nanoparticles of varying hydrophobicity.
  • Employed adsorption isotherms, SEM, optical microscopy, and coagulation studies.

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Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles
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  • Investigated the influence of pH and salt concentration on nanoparticle adsorption.

    • Main Results:

    • Hydrophilic nanoparticle adsorption is pH-insensitive but salt-sensitive; hydrophobic nanoparticle adsorption is governed by hydrophobic and electrostatic forces.
    • Hydrophilic nanoparticle layers provide a weak coalescence barrier (approx. 1kT).
    • Rigid layers of hydrophobic silica nanoparticles enable significant sustained dibutyl phthalate (DBP) release with high activation energies.

    Conclusions:

    • Silica nanoparticle coatings can effectively stabilize emulsions and control lipophilic molecule release.
    • Hydrophobic nanoparticle coatings create rigid interfacial layers that significantly reduce coalescence and facilitate sustained DBP release.
    • This approach offers a promising strategy for developing advanced delivery systems.