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Reverse Micelle Formation Using a Sodium Di(n-Octyl) Phosphinate Surfactant.

Esalah1, Weber, Vera

  • 1Department of Chemical Engineering, McGill University, Montreal, Quebec, H3A 2B2, Canada

Journal of Colloid and Interface Science
|September 18, 1999
PubMed
Summary
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This study synthesized sodium di(n-octyl) phosphinate as a surfactant to create reverse micelles. Optimal water solubilization in organic solvents was achieved using specific cosurfactant ratios, revealing critical parameters for micelle formation.

Area of Science:

  • Physical Chemistry
  • Colloid and Surface Science
  • Surfactant Chemistry

Background:

  • Reverse micelles are crucial for solubilizing water in organic solvents.
  • Sodium di(n-octyl) phosphinate is a surfactant capable of forming these structures.
  • Understanding the role of cosurfactants is key to controlling micelle properties.

Purpose of the Study:

  • To synthesize and characterize sodium di(n-octyl) phosphinate for reverse micelle formation.
  • To investigate the effect of two cosurfactants (decanol and di(n-octyl) phosphinic acid) on water solubilization.
  • To determine the optimal conditions for maximum water uptake in a Winsor II system.

Main Methods:

  • Synthesis and purification of sodium di(n-octyl) phosphinate.
  • Formation of reverse micelles in isooctane using the contact method.

Related Experiment Videos

  • Adjustment of ionic strength with sodium chloride.
  • Systematic variation of cosurfactant (decanol, di(n-octyl) phosphinic acid) to surfactant mole ratios.

    • Main Results:

    • A minimum cosurfactant to surfactant mole ratio was necessary for reverse micelle formation and water solubilization.
    • Maximum water uptake occurred at this minimum ratio, with no uptake above a specific maximum ratio.
    • The maximum mole ratio for di(n-octyl) phosphinic acid was independent of concentration, while for decanol, it decreased with increasing concentration.
    • Increased cosurfactant concentration led to enhanced maximum water uptake.

    Conclusions:

    • Sodium di(n-octyl) phosphinate effectively forms reverse micelles.
    • The choice and concentration of cosurfactant significantly influence water solubilization capacity.
    • Specific mole ratios of cosurfactant to surfactant are critical for optimizing Winsor II systems.