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Multi-body coalescence in Pickering emulsions.
Tong Wu1, Haitao Wang1, Benxin Jing2
1Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, Indiana 46556, USA.
Nature Communications
|January 13, 2015
Summary
Pickering emulsions exhibit simultaneous multi-droplet coalescence, a novel behavior observed with various particles. This finding enhances understanding and design of these particle-stabilized systems.
Area of Science:
- Colloid and Surface Science
- Materials Science
- Physical Chemistry
Background:
- Particle-stabilized Pickering emulsions display unique phenomena, including non-spherical droplet formation and inhibited coalescence.
- Previous research has documented unusual behaviors in Pickering emulsions, prompting further investigation into droplet dynamics.
Purpose of the Study:
- To report and characterize the novel phenomenon of simultaneous multi-droplet coalescence in Pickering emulsions.
- To investigate the influence of different particle types and surface interactions on multi-body coalescence.
Main Methods:
- Utilized latex particles, silica particles, and carbon nanotubes as model stabilizers for Pickering emulsions.
- Observed and analyzed multi-body coalescence events in both water-in-oil and oil-in-water emulsion systems.
- Quantified the number of coalescing droplets using the tetrahedral sequence in close packing.
Main Results:
- Demonstrated simultaneous coalescence of multiple droplets in a single event across different emulsion types.
- Showed that repulsive particles (latex, silica) promote coalescence, while attractive particles (carbon nanotubes) inhibit it.
- The number of droplets in coalescence events follows a pattern related to the tetrahedral sequence.
Conclusions:
- Multi-body coalescence is a newly identified behavior in Pickering emulsions.
- Particle properties, specifically surface interactions (repulsive vs. attractive), significantly impact multi-droplet coalescence.
- This discovery aids in understanding natural Pickering emulsions and optimizing engineered systems.
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