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Related Experiment Video

Updated: Mar 14, 2026

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Molecular-Thermodynamic Modeling of Mixed Cationic/Anionic Vesicles.

Pak K Yuet1, Daniel Blankschtein1

  • 1Department of Chemical Engineering, and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary

A new molecular-thermodynamic theory predicts vesicle properties, explaining stabilization mechanisms in mixed surfactant systems. This model accurately forecasts vesicle size and surface potential, validated by experiments with CTAB and SOS surfactants.

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Area of Science:

  • Physical Chemistry
  • Colloid and Surface Science
  • Materials Science

Background:

  • Vesicles serve as model cells and are utilized as drug carriers and encapsulating devices.
  • Understanding vesicle formation is crucial for their practical applications in various industries.

Purpose of the Study:

  • To develop a molecular-thermodynamic theory for predicting the formation and properties of two-component mixed vesicles.
  • To elucidate the mechanisms of stabilization in mixed cationic/anionic vesicular systems.
  • To investigate the influence of surfactant molecular structure and solution conditions on vesicle characteristics.

Main Methods:

  • Calculated the free energy of vesiculation by modeling surfactant-tail packing, headgroup steric repulsions, and electrostatic interactions.
  • Employed a mean-field approach for tail conformations and the nonlinear Poisson-Boltzmann equation for charged vesicles.
  • Accounted for curvature corrections to interfacial tensions and steric repulsion surfaces.

Main Results:

  • The theory accurately predicts vesicle size distribution, surface potentials, and leaflet compositions.
  • Demonstrated entropic stabilization in mixed cetyltrimethylammonium bromide (CTAB) and sodium octyl sulfate (SOS) vesicles.
  • Predicted a mean vesicle radius of 1200 Å and an outer surface potential of -72 mV for a specific CTAB/SOS mixture, aligning with experimental data.

Conclusions:

  • The developed theory provides a fundamental understanding of vesicle formation and stabilization mechanisms.
  • It enables prediction of vesicle properties based solely on surfactant molecular structures and solution conditions.
  • The theory successfully explains the behavior of mixed cationic/anionic vesicles, including the effect of added salt.