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Vesicle Phases with Semipolar Additives.

H. Hoffmann1, K. Horbaschek, F. Witte

  • 1Physikalische Chemie I, Universität Bayreuth, Bayreuth, D-95445, Germany

Journal of Colloid and Interface Science
|March 10, 2001
PubMed
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Semipolar additives like hexylacetate transform micellar solutions into lamellar phases and microemulsions. Even small amounts of additives can induce significant phase changes in surfactant systems.

Area of Science:

  • Colloid and Surface Science
  • Materials Science

Background:

  • Zwitterionic surfactant systems are crucial in various applications.
  • Understanding phase behavior is key to controlling surfactant system properties.
  • Semipolar additives can influence surfactant aggregation and phase transitions.

Purpose of the Study:

  • To investigate the effect of semipolar additives (esters and ketones) on the phase behavior of mixed zwitterionic surfactant/cosurfactant systems.
  • To characterize the resulting phases, including micellar (L1), lamellar (Lα), and microemulsion phases.
  • To explore the influence of preparation methods (shear vs. diffusion) on phase behavior.

Main Methods:

  • Systematic variation of semipolar additive concentrations (hexylacetate, hexylmethylketone) in tetradecyldimethylamineoxide (TDMAO)/cosurfactant solutions.

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  • Phase behavior analysis through conductivity measurements and electron microscopy.
  • Comparative sample preparation with and without shear forces.

    • Main Results:

    • Additives induce phase transitions from L1 to Lα and then to microemulsion with increasing concentration.
    • The Lα phase forms densely packed multilamellar vesicles with significantly lower conductivity than the L1 phase.
    • Very small cosurfactant concentrations can trigger L1 to Lα phase transformation.
    • The Lα phase exhibits viscoelastic properties.
    • Shear forces during preparation can lead to fundamental differences in phase behavior.

    Conclusions:

    • Semipolar additives act as both consurfactants and hydrocarbons, significantly altering surfactant phase diagrams.
    • Multilamellar vesicles form the Lα phase, characterized by low conductivity and viscoelasticity.
    • The sensitivity of phase transitions to additive concentration and preparation methods highlights the complexity of these systems.