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Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device
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Hydrodynamic model for drying emulsions.

Huanhuan Feng1,2, Joris Sprakel1, Jasper van der Gucht1

  • 1Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, Netherlands.

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Summary
This summary is machine-generated.

This study models film formation in oil-in-water emulsions. It reveals two coalescence modes based on pressure and evaporation, impacting film formation speed and structure.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Colloid science

Background:

  • Dense emulsions undergo complex changes during drying.
  • Understanding film formation is crucial for emulsion stability and application.

Purpose of the Study:

  • To develop a hydrodynamic model for film formation in drying oil-in-water emulsions.
  • To investigate the influence of pressure gradients and evaporation rates on droplet coalescence.

Main Methods:

  • Hydrodynamic modeling of water flow and pressure buildup.
  • Analysis of film rupture and droplet coalescence dynamics.
  • Development of a state diagram to categorize film formation modes.

Main Results:

  • Water flow creates pressure gradients, leading to film rupture and droplet coalescence.
  • Two distinct coalescence modes were identified: bulk and front-limited.
  • Front-limited coalescence results in an oil layer, slowing film formation.

Conclusions:

  • The model accurately predicts film formation behavior in emulsions.
  • Coalescence modes are dependent on critical disjoining pressure and evaporation rate.
  • Findings align with experimental observations and provide a framework for emulsion design.