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Updated: Jun 18, 2026

Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs
08:18

Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs

Published on: July 27, 2022

Scenario for equilibrium solid-stabilized emulsions.

Willem K Kegel1, Jan Groenewold

  • 1Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. w.k.kegel@uu.nl

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2009
PubMed
Summary
This summary is machine-generated.

Colloidal particles can spontaneously emulsify oil/water systems by overcoming interfacial tension through ionic dissociation. This occurs when oil-water tension is low, colloids favor oil over water, and colloid surface charge density is high with a suitable Debye length.

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Last Updated: Jun 18, 2026

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Area of Science:

  • Colloid and Interface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Spontaneous emulsification is crucial for various industrial applications.
  • Understanding the role of colloidal particles in stabilizing emulsions is key.
  • Existing models often do not fully capture the conditions for spontaneous emulsification driven by particle properties.

Purpose of the Study:

  • To theoretically investigate the conditions under which colloidal particles induce spontaneous emulsification in oil/water systems.
  • To elucidate the interplay between capillary forces, entropic contributions from ionic dissociation, and particle adsorption at interfaces.

Main Methods:

  • Theoretical modeling of colloidal particle behavior at oil/water interfaces.
  • Analysis of interfacial tension, entropic contributions, and electrostatic interactions.
  • Derivation of conditions based on colloid properties and system parameters.

Main Results:

  • Colloidal particles can adsorb at the oil/water interface and drive spontaneous emulsification.
  • Spontaneous emulsification is favored by low oil-water interfacial tension (≤ a few mN/m).
  • Key conditions include preferential colloid wetting of oil over water, high surface charge density on colloids (≈ 1 nm⁻²), and a Debye length comparable to colloid size.

Conclusions:

  • The study provides a theoretical framework for spontaneous emulsification driven by colloidal particles.
  • Ionic dissociation on colloid surfaces provides an entropic driving force that compensates for capillary penalties.
  • The findings offer insights into designing colloidal systems for controlled emulsification.