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Phase behavior and nano-emulsion formation by the phase inversion temperature method.

Paqui Izquierdo1, Jordi Esquena, Tharward F Tadros

  • 1Departament de Tecnologia de Tensioactius, Institut d'Investigacions Químiques i Ambientals de Barcelona, CSIC, Jordi Girona 18-26, 08034-Barcelona, Spain.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 28, 2004
PubMed
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This study investigated oil-in-water nano-emulsions using phase inversion temperature emulsification. Optimal nano-emulsion formation and stability were achieved when emulsification began in specific microemulsion or liquid crystalline phase regions.

Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Nano-emulsions are crucial for various applications, including drug delivery and food processing.
  • Understanding the influence of phase behavior on nano-emulsion formation is essential for controlling droplet size and stability.

Purpose of the Study:

  • To investigate the formation and stability of oil-in-water nano-emulsions in a water/C12E4/isohexadecane system.
  • To determine the effect of phase behavior on nano-emulsion droplet size and long-term stability.

Main Methods:

  • Utilized the phase inversion temperature (PIT) emulsification method.
  • Emulsification was initiated at the hydrophilic-lipophilic balance (HLB) temperature and samples were rapidly cooled to 25°C.
  • Nano-emulsion droplet size was measured using dynamic light scattering (DLS).

Related Experiment Videos

  • Nano-emulsion stability was assessed by monitoring droplet size over time.

    • Main Results:

    • The smallest nano-emulsion droplet sizes were obtained when emulsification commenced within the bicontinuous microemulsion (D) phase region or a co-existing microemulsion (D) and liquid crystalline (Lα) phase region.
    • Nano-emulsion breakdown is linked to oil transfer from smaller to larger droplets.
    • Increased surfactant concentration correlated with decreased nano-emulsion stability, potentially due to enhanced oil micellar transport.

    Conclusions:

    • Phase behavior significantly impacts nano-emulsion characteristics, with specific microemulsion and liquid crystalline phases yielding optimal results.
    • Surfactant concentration plays a critical role in nano-emulsion stability, with excess surfactant potentially destabilizing the system.
    • The findings provide valuable insights for designing and optimizing nano-emulsion formulations.