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Cross-diffusion-induced convective patterns in microemulsion systems.

M A Budroni1, L Lemaigre, A De Wit

  • 1Department of Chemistry and Pharmacy, University of Sassari, Via Vienna 2, 07100 Sassari, Italy.

Physical Chemistry Chemical Physics : PCCP
|September 17, 2014
PubMed
Summary
This summary is machine-generated.

Cross-diffusion drives convective fingering in microemulsions. This instability arises from density changes and salt-induced water/micelle movement, creating finger-like patterns.

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Area of Science:

  • Fluid dynamics
  • Physical chemistry
  • Materials science

Background:

  • Microemulsions exhibit complex behaviors when stratified.
  • Cross-diffusion can significantly alter fluid interfaces.

Purpose of the Study:

  • To experimentally demonstrate cross-diffusion-induced convective fingering.
  • To elucidate the mechanism behind this hydrodynamic instability.

Main Methods:

  • Stratification of two microemulsions with differing compositions.
  • Inducing diffusion of a salt entraining water and AOT micelles.
  • Observing interface deformation and density profile changes.

Main Results:

  • Convective fingering was observed around the initially stable interface.
  • A non-monotonic density profile developed due to salt and micelle diffusion.
  • The interface deformed into characteristic finger patterns.

Conclusions:

  • Cross-diffusion is a key factor in inducing hydrodynamic instability in stratified microemulsions.
  • The observed fingering is driven by buoyancy and density gradients.
  • A diffusion model accurately explains the instability and finger properties.