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Description of Micellar Radii for Phase Behavior and Viscosity Modeling of Aqueous Surfactant Solutions and Microemulsions.

Langmuir : the ACS journal of surfaces and colloids·2018
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Coupled Interfacial Tension and Phase Behavior Model Based on Micellar Curvatures.

V A Torrealba1,2, R T Johns1

  • 1Department of Energy and Mineral Engineering and EMS Energy Institute, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 9, 2017
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Summary

This study presents a robust model predicting microemulsion interfacial tension (IFT) and phase behavior. It links IFT and characteristic length via hydrophilic-lipophilic deviation (HLD), enabling simultaneous tuning for diverse Winsor types.

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Area of Science:

  • Physical Chemistry
  • Colloid Science
  • Surfactant Science

Background:

  • Microemulsions are crucial in enhanced oil recovery and drug delivery.
  • Predicting interfacial tension (IFT) and phase behavior is complex.
  • Existing models often lack robustness across different microemulsion types.

Purpose of the Study:

  • To develop a unified and robust model for predicting microemulsion interfacial tensions (IFT) and phase behavior.
  • To couple IFT prediction with phase behavior for simultaneous tuning.
  • To establish relationships between IFT, characteristic length, and hydrophilic-lipophilic deviation (HLD).

Main Methods:

  • Incorporation of film bending arguments and Huh's equation.
  • Coupling the IFT model with phase behavior predictions.
  • Relating IFT to solubilization ratios and micelle curvatures.

Main Results:

  • The model accurately predicts IFT for all microemulsion Winsor types and compositions.
  • Demonstrated relationship between oil-water IFT, characteristic length, and HLD.
  • Successful prediction of two- and three-phase behavior (tie lines, tie triangles) by varying input parameters.

Conclusions:

  • The developed model offers a consistent and predictive tool for microemulsion systems.
  • Simultaneous tuning of IFT and phase behavior is achievable.
  • The approach provides excellent agreement with experimental data.