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Related Experiment Videos

Double emulsions: how does release occur?

K Pays1, J Giermanska-Kahn, B Pouligny

  • 1Centre de Recherche Paul Pascal, CNRS, Avenue Schweitzer, 33600, Pessac, France.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|February 21, 2002
PubMed
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This study investigates how substances are released from water-in-oil-in-water (W/O/W) double emulsions. Researchers identified two main release mechanisms: film coalescence and compositional ripening, offering insights into controlled release applications.

Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Chemical Engineering

Background:

  • Water-in-oil-in-water (W/O/W) double emulsions encapsulate smaller droplets within larger ones.
  • These structures are promising for controlled release applications.
  • Understanding stability and release requires well-defined model systems.

Purpose of the Study:

  • To investigate the mechanisms of chemical substance release from W/O/W double emulsions.
  • To utilize quasi-monodisperse double emulsions with controlled droplet sizes.
  • To differentiate between release via film coalescence and compositional ripening.

Main Methods:

  • Fabrication of quasi-monodisperse W/O/W double emulsions.
  • Investigation of NaCl release mechanisms.

Related Experiment Videos

  • Systematic variation of surfactant properties and composition.
  • Analysis of release kinetics under different conditions.

    • Main Results:

    • Identified two primary release mechanisms: film coalescence and compositional ripening.
    • Demonstrated that surfactant properties influence which mechanism dominates.
    • Established conditions favoring diffusion/permeation (compositional ripening) versus film rupture (coalescence).

    Conclusions:

    • The release of substances from W/O/W double emulsions can be controlled by manipulating surfactant characteristics.
    • Basic rules governing W/O/W double emulsion behavior were established.
    • Findings provide a foundation for designing advanced controlled release systems.