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From a bouncing compound drop to a double emulsion.

D Terwagne1, T Gilet, N Vandewalle

  • 1GRASP, Department of Physics, University of Liège, Liège, Belgium. D.Terwagne@ulg.ac.be

Langmuir : the ACS Journal of Surfaces and Colloids
|May 25, 2010
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Summary
This summary is machine-generated.

Researchers demonstrate creating oil-in-water-in-oil double emulsions from compound droplets impacting a vibrated liquid surface. Emulsification occurs above a threshold Weber number, dependent on frequency but not droplet size.

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Area of Science:

  • Colloid and Surface Science
  • Fluid Dynamics
  • Materials Science

Background:

  • Compound droplets, specifically surfactant solution in oil, are utilized as the starting material.
  • The study investigates the behavior of these droplets upon impact with a liquid surface.

Purpose of the Study:

  • To demonstrate the creation of a specific type of double emulsion (oil in water in oil).
  • To identify and rationalize the conditions and mechanisms leading to double emulsion formation.

Main Methods:

  • Vertically vibrating a liquid surface to induce droplet impacts.
  • Observing the transformation of compound droplets into double emulsions under controlled vibration amplitudes.
  • Analyzing the impact dynamics by investigating droplet impacts on a static liquid surface.

Main Results:

  • A double emulsion (oil in water in oil) is successfully formed from a compound droplet.
  • The formation process involves the oil layer penetrating the water core upon impact exceeding a vibration amplitude threshold.
  • The emulsification threshold is found to be dependent on the forcing frequency but independent of the droplet size.
  • Droplet creation is linked to the impact kinetic energy exceeding the energy required for droplet deformation, defined by the Weber number.

Conclusions:

  • The study provides a novel method for generating oil-in-water-in-oil double emulsions.
  • The findings offer a physical basis for understanding the emulsification threshold in terms of impact energy and fluid properties.