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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Published on: September 30, 2014

Particle bridging between oil and water interfaces.

Hui Xu1, Mauricio Lask, John Kirkwood

  • 1Department of Chemical Engineering, Stanford University, Stanford, California 94305-5025, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary

Particle bridging at oil-water interfaces forms particle discs, preventing drop coalescence. This process does not require particle registry and follows a power law, with potential for phase segregation in binary mixtures.

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Area of Science:

  • Colloid and Surface Science
  • Interfacial Phenomena
  • Materials Science

Background:

  • Particle bridging at fluid interfaces is crucial for stabilizing emulsions and preventing coalescence.
  • Previous studies emphasized particle registry between interfaces for successful bridging.
  • The role of particle size and interfacial properties in bridging dynamics remains an active area of research.

Purpose of the Study:

  • To investigate particle bridging dynamics between a water drop and an oil-water interface.
  • To determine if particle registry is essential for bridging.
  • To analyze the growth kinetics of particle discs and explore phase segregation in binary particle mixtures.

Main Methods:

  • Controlled experiments involving bringing a water drop into contact with a particle-covered oil-water interface.
  • Utilizing interfaces with different particle sizes and clean interfaces to study bridging mechanisms.
  • Observing and quantifying particle disc formation and growth dynamics.
  • Conducting experiments with binary mixtures of particles to study phase segregation.

Main Results:

  • Particle bridging forms dense particle discs that inhibit drop coalescence.
  • Particle registry between interfaces is not a prerequisite for bridging; selective bridging by particles from one interface was observed.
  • Particle disc growth follows a power law (r ∝ t^0.32±0.03), consistent with capillary attraction and hydrodynamic resistance (r ∝ t^1/3).
  • Binary particle mixtures exhibit phase segregation driven by the particle bridging process.

Conclusions:

  • Particle bridging is a robust phenomenon that can occur without precise particle alignment.
  • The observed power law dynamics provide insights into the forces governing interfacial particle assembly.
  • Particle bridging can act as a driving force for phase separation in complex colloidal systems.