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Molten fatty acid based microemulsions.

Cecile Noirjean1, Fabienne Testard, Christophe Dejugnat

  • 1LIONS, NIMBE, CEA, CNRS, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France. cecile.noirjean@saint-gobain.com david.carriere@cea.fr.

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Summary
This summary is machine-generated.

This study demonstrates that myristic acid and CTAB can form stable microemulsions with water without salt or co-surfactants. Myristic acid acts as both a solvent and co-surfactant, enabling tunable complex structures.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Microemulsions typically require salts or co-surfactants for stability.
  • Fatty acids and surfactants are key components in formulation science.

Purpose of the Study:

  • To investigate the formation of microemulsions using myristic acid (MA) and cetyltrimethylammonium bromide (CTAB) without additional agents.
  • To characterize the structures and thermal behavior of these novel microemulsions.

Main Methods:

  • Small-angle neutron scattering (SANS)
  • Small-angle X-ray scattering/Wide-angle X-ray scattering (SAXS/WAXS)
  • Differential scanning calorimetry (DSC)
  • Phase diagram determination

Main Results:

  • Stable ternary microemulsions of MA, CTAB, and water were formed above MA's melting point without salt or co-surfactants.
  • Myristic acid exhibited a dual role, acting as both a solvent and a co-surfactant, forming an equimolar complex with CTAB.
  • Water influenced film curvature and structure but not the thermal behavior, which was dominated by MA/CTAB interactions.

Conclusions:

  • Myristic acid's "solvosurfactant" behavior allows for the creation of complex microemulsion structures without traditional additives.
  • This finding opens new avenues for formulating advanced materials using fatty acids and surfactants.