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Solvent dependent interactions between droplets in water-in-oil microemulsions
Peizhu Zheng1, Yuanming Ma, Dashuang Fan
1Department of Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China. shenwg@lzu.edu.cn.
Soft Matter
|August 27, 2014
Summary
Investigating water/AOT/oil microemulsions revealed that droplet interactions vary with oil type. Repulsive interactions were observed for isooctane and decane, while attractive interactions occurred with cyclohexane and toluene.
Area of Science:
- Physical Chemistry
- Colloid and Surface Chemistry
Background:
- Microemulsions are thermodynamically stable, optically isotropic liquid phases.
- Understanding droplet interactions is crucial for microemulsion stability and applications.
Purpose of the Study:
- To investigate the dilution enthalpies and droplet interactions in water/AOT/oil microemulsions.
- To determine the influence of different oils (isooctane, decane, cyclohexane) on droplet interactions.
Main Methods:
- Isothermal titration microcalorimetry (ITC) was used to measure dilution enthalpies.
- Static light scattering was employed to confirm droplet interactions for the isooctane system.
Main Results:
- Enthalpy interactions between droplets were repulsive for isooctane and decane systems.
- Enthalpy interactions were attractive for cyclohexane and toluene systems.
- Repulsive droplet interactions in the isooctane system were corroborated by static light scattering.
Conclusions:
- Solvents significantly influence droplet enthalpy interactions in microemulsions, shifting them from positive to negative.
- Entropy contribution appears to be the dominant factor in the stability of these microemulsion droplet systems.
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