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Multicomponent diffusion in solute-containing micelle and microemulsion solutions.
Wyatt J Musnicki1, Stephanie R Dungan, Ronald J Phillips
1Department of Chemical Engineering and Materials Science and ‡Department of Food Science and Technology, University of California , Davis, California 95616, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 20, 2014
Summary
Diffusion rates of hydrophobic solutes and surfactants in microemulsions were measured. Solute gradients significantly impact surfactant movement, revealing strong coupling in these complex fluids.
Area of Science:
- Physical Chemistry
- Colloid and Surface Chemistry
Background:
- Microemulsions are complex fluids with applications in various industries.
- Understanding diffusion dynamics is crucial for controlling microemulsion behavior.
Purpose of the Study:
- To quantify multicomponent diffusion coefficients for hydrophobic solutes and surfactants in microemulsions.
- To investigate the coupling between solute and surfactant diffusion.
Main Methods:
- Holographic interferometry was employed to measure diffusion coefficients.
- Three hydrophobic solutes (pentanol, octanol, heptane) were studied in C12E10 and SDS microemulsions.
Main Results:
- New multicomponent diffusion coefficients were determined for the first time.
- A strong coupling between solute and surfactant diffusion was observed.
- Solute concentration gradients induced significant surfactant flux.
Conclusions:
- Hydrophobic solutes profoundly influence surfactant chemical potential in microemulsions.
- This coupling effect is significant for both nonionic (C12E10) and ionic (SDS) microemulsions.
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