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Double Emulsion Generation Using a Polydimethylsiloxane (PDMS) Co-axial Flow Focus Device
Published on: December 25, 2015
Coalescence in double emulsions
Martín Chávez-Páez1, Carla M Quezada, Laura Ibarra-Bracamontes
1Instituto de Física Manuel Sandoval Vallarta, Universidad Autónoma de San Luis Potosí, Alvaro Obregón 64, 78000 San Luis Potosí, SLP, Mexico.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 21, 2012
Summary
Coalescence in double emulsions (water-in-oil-in-water) depends on inner droplet and external phase interactions. Surfactant balance dictates which process dominates, leading to predictable system evolution.
Area of Science:
- Colloid and Surface Science
- Physical Chemistry
- Materials Science
Background:
- Double emulsions (water-in-oil-in-water) exhibit complex dynamics governed by coalescence.
- Understanding coalescence is crucial for controlling emulsion stability and properties.
Purpose of the Study:
- To investigate the coalescence processes in water-in-oil-in-water double emulsions.
- To identify the factors influencing the interplay between different coalescence mechanisms.
- To develop a predictive model for double emulsion evolution.
Main Methods:
- Optical microscopy was used to observe the time evolution of double emulsion systems.
- A computer simulation modeled the system as a spherical cavity with Brownian spheres.
- Coalescence probabilities P(i) (internal) and P(e) (external) were defined in the simulation.
Main Results:
- The interplay between inner droplet coalescence and droplet-external phase coalescence dictates system evolution.
- The relative amounts of hydrophilic and lipophilic surfactants regulate the predominance of each coalescence process.
- A master behavior was observed in a specific class of experimental systems.
- Computer simulations successfully reproduced the experimental phenomenology with appropriate probability parameters.
Conclusions:
- The study elucidates the key mechanisms governing coalescence in double emulsions.
- Surfactant composition is a critical factor in controlling emulsion stability.
- The developed simulation model provides a valuable tool for predicting and understanding double emulsion behavior.
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