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Related Experiment Videos

Gels in soap stabilized emulsions.

J M Pickett, K A Ellway

    The Journal of Pharmacy and Pharmacology
    |August 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    The contact angle of soap gels at the oil/water interface influences emulsion type. Different soap gels, like magnesium or ammonium oleate, affect emulsion stability and prevent inversion to water-in-oil types.

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    Area of Science:

    • Colloid and Surface Science
    • Emulsion Technology
    • Materials Science

    Background:

    • Liquid paraffin emulsions are stabilized by soap gels.
    • The type of emulsion (oil-in-water or water-in-oil) can be influenced by the stabilizing agent.
    • Contact angle measurements at the oil/water interface are crucial for understanding interfacial phenomena.

    Purpose of the Study:

    • To investigate the correlation between emulsion type and the contact angle of soap gels.
    • To compare the behavior of magnesium oleate and ammonium oleate gels in stabilizing liquid paraffin emulsions.
    • To determine if contact angle differences predict emulsion stability and inversion behavior.

    Main Methods:

    • Preparation of two distinct series of liquid paraffin emulsions stabilized by magnesium oleate gels and ammonium oleate gels.

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  • Synthesis of soap gels using double decomposition (magnesium oleate) and suppression of ionization (ammonium oleate).
  • Measurement of contact angles of the respective soap gels at the oil/water interface.

    • Main Results:

    • A correlation was observed between emulsion type and the contact angle of the soap gel at the oil/water interface.
    • Emulsions stabilized by magnesium oleate gels showed different behavior compared to those stabilized by ammonium oleate gels.
    • Unlike the magnesium oleate system, the ammonium oleate series did not undergo inversion to water-in-oil emulsions.

    Conclusions:

    • The contact angle of the soap gel at the oil/water interface is a significant factor in determining emulsion type and stability.
    • Differences in the contact angles of magnesium oleate and ammonium oleate gels explain the observed dissimilarity in emulsion inversion behavior.
    • Contact angle provides a predictive parameter for emulsion stability in soap-stabilized systems.