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Water in Oil Emulsions: A New System for Assembling Water-soluble Chlorophyll-binding Proteins with Hydrophobic Pigments
Published on: March 21, 2016
Interparticle interactions in concentrate water-oil emulsions
N A Mishchuk1, A Sanfeld, A Steinchen
1Institute of Colloid Chemistry and Chemistry of Water, Ukrainian National Academy of Sciences, 42 Vernadsky Avenue, 03680 Kiev, Ukraine. nataliya@mis.kiev.ua
Advances in Colloid and Interface Science
|December 8, 2004
Summary
This study models concentrated water-in-oil emulsions, revealing that higher droplet concentrations reduce stability by lowering energy barriers, enhancing coagulation. However, medium concentrations can increase stability by raising these barriers.
Area of Science:
- Colloid and Surface Science
- Physical Chemistry
- Materials Science
Background:
- The stability of concentrated emulsions is crucial in various industrial applications.
- Existing models often simplify droplet interactions in dense systems.
- Understanding electrostatic and Van der Waals forces is key to predicting emulsion stability.
Purpose of the Study:
- To develop a stability theory for concentrated water-in-oil (W/O) emulsions based on Albers and Overbeek's electrostatic interaction model.
- To investigate the influence of droplet volume fraction on coagulation and emulsion stability.
- To refine interaction models by incorporating corrections for double layer thickness and van der Waals screening.
Main Methods:
- Developed a stability theory for concentrated W/O emulsions, extending the Albers and Overbeek model.
- Analyzed electrostatic and Van der Waals interactions between non-deformed droplets.
- Introduced a reference energy accounting for interactions with surrounding droplets in concentrated systems.
- Incorporated a correction factor (beta) for electrostatic double layer deviations from sphericity.
- Accounted for electrolyte screening in Van der Waals interactions.
- Defined critical volume fractions (phi(c1), phi(c2), phi(c3)) to delineate model applicability and rapid coagulation onset.
- Briefly considered the influence of gravitational coagulation.
Main Results:
- In concentrated emulsions, increasing volume fraction lowers the energy barrier between droplets, enhancing coagulation.
- At very high volume fractions (dense packing), the energy barrier vanishes.
- At medium volume fractions, the energy barrier can increase, extending emulsion stability.
- Correction factors for electrostatic and Van der Waals interactions promote coagulation by reducing the energy barrier.
- Critical volume fractions were defined to characterize model validity and coagulation behavior.
- Gravitational coagulation probability is higher than Brownian coagulation for fixed or sedimenting droplets.
Conclusions:
- Emulsion stability is highly dependent on droplet volume fraction and inter-droplet interactions.
- The developed model provides a more accurate prediction of stability in concentrated W/O emulsions.
- Understanding these interactions is essential for controlling emulsion properties and preventing phase separation.
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