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Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device

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Understanding the Stability of Poorly Covered Pickering Emulsions Using on-Chip Microfluidics.

Xuefeng Shen¹, Chang Chen¹, Berend van der Meer¹

¹Laboratory of Physical Chemistry and Soft Matter, Wageningen University and Research, Stippeneng 4, Wageningen, 6708 WE, The Netherlands.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|February 3, 2025

Summary

Particle-stabilized emulsions, or Pickering emulsions, remain stable even with sparse particle coverage. This study reveals particle bridges forming crowns between droplets, ensuring exceptional stability.

Keywords:

droplet coalescence microfluidics pickering emulsions poorly‐covered stabilization

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Particle Templated Emulsification enables Microfluidic-Free Droplet Assays

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Published on: March 9, 2021

Area of Science:

Colloid and Surface Science
Materials Science
Fluid Dynamics

Background:

Particle-stabilized emulsions (Pickering emulsions) offer enhanced stability compared to conventional surfactant-stabilized systems.
While densely covered interfaces are common, the stability of sparsely covered Pickering emulsions remains less understood.
Understanding interfacial particle behavior is crucial for designing robust emulsion systems.

Purpose of the Study:

To investigate the formation, dynamics, and stability of poorly covered model Pickering emulsions.
To elucidate the mechanism behind the exceptional stability of sparsely covered Pickering emulsions.
To explore particle assembly at interfaces under controlled hydrodynamic conditions.

Main Methods:

Utilized a microfluidic platform for controlled emulsion formation.
Employed confocal microscopy to visualize particle distribution and interfacial structures.
Analyzed interfacial forces and particle dynamics, corroborated by numerical simulations.

Main Results:

Achieved highly stable Pickering emulsions with surface area coverage below 3%, stable for over 12 hours.
Identified spatially heterogeneous particle distribution leading to the formation of particle bridges.
Observed particle bridges assembling into crown-like structures at droplet contact points.

Conclusions:

Demonstrated exceptional stability in poorly covered Pickering emulsions due to particle bridging.
Provided insights into the self-assembly of particles at interfaces under hydrodynamic influence.
Highlighted the potential of lab-on-a-chip approaches for fabricating stable Pickering emulsions via preferential interfacial localization.