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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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A new model to study the phase transition from microstructures to nanostructures in ionic/ionic surfactants mixture.

Beheshteh Sohrabi1, Hussein Gharibi, Soheila Javadian

  • 1Department of Chemistry, Tarbiat Modarres University, P.O. Box 14155-4838, Tehran, Iran.

The Journal of Physical Chemistry. B
|August 10, 2007
PubMed
Summary

Oppositely charged surfactants cetyltrimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) form vesicles and mixed micelles. Differences in hydrophobic chain lengths stabilize vesicles, driving a phase transition from vesicles to mixed micelles with changing concentrations.

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Area of Science:

  • Physical Chemistry
  • Colloid and Surface Chemistry
  • Supramolecular Chemistry

Background:

  • Mixtures of oppositely charged surfactants exhibit complex phase behavior.
  • Understanding aggregate structures is crucial for surfactant science.

Purpose of the Study:

  • To explore the phase behavior and aggregate structures of CTAB/SDS mixtures.
  • To determine aggregation numbers and hydrodynamic radii of vesicles and mixed micelles.
  • To investigate the phase transition between vesicles and mixed micelles.

Main Methods:

  • Pulsed field gradient stimulated echo (PFG-STE) NMR spectroscopy.
  • Viscosity and self-diffusion coefficient measurements.
  • Conductometry measurements.

Main Results:

  • Mixed micelles were larger than uniformly charged micelles.
  • A phase transition from vesicles to mixed micelles was observed with changing CTAB/SDS concentrations.
  • Hydrophobic chain length differences stabilize vesicles over other structures.

Conclusions:

  • Vesicles form spontaneously in both cationic-rich and anionic-rich CTAB/SDS solutions.
  • A new model was developed to estimate surface potentials and electrostatic free energy.
  • The study investigated variations in electrostatic and transfer free energy during phase transitions.