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Arresting dissolution by interfacial rheology design.

Peter J Beltramo1, Manish Gupta2, Alexandra Alicke1

  • 1Department of Materials, ETH Zürich, CH-8093 Zürich, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|September 13, 2017
PubMed
Summary
This summary is machine-generated.

Researchers engineered "armored bubbles" to prevent dissolution by designing interfacial rheology, not just particle coverage. This strategy works even with fewer particles, offering broad applications in foams and emulsions.

Keywords:
Ostwald ripeningemulsionsfoamsinterfacial rheologyyield stress

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Fluid Dynamics

Background:

  • Particle-coated bubbles, or
  • armored bubbles
  • , are susceptible to dissolution.
  • Previous understanding suggested dense particle monolayers were necessary to prevent bubble dissolution.

Purpose of the Study:

  • To present a strategy for halting bubble dissolution using interfacial rheology design.
  • To demonstrate that engineered interfacial properties, not just particle density, can stabilize bubbles.
  • To investigate the relationship between interfacial rheology and bubble dissolution kinetics.

Main Methods:

  • Characterization of spherical and ellipsoidal particles at air-water interfaces using interfacial rheology techniques.
  • Fabrication of bubbles with varying particle coverages.
  • Evaluation of bubble dissolution resistance using a microfluidic technique.

Main Results:

  • Engineering a 2D yield stress interface suffices to prevent bubble dissolution at submonolayer particle coverages.
  • Armored bubbles exhibit a range of pressures over which dissolution is arrested, unlike bare bubbles.
  • Nonspherical particles achieve significant yield stress at lower coverages, confirming the design rationale.

Conclusions:

  • Interfacial rheology design is a key factor in stabilizing particle-coated bubbles.
  • The developed strategy can inhibit Ostwald ripening in various foam and emulsion applications.
  • This approach offers a more efficient method for creating stable armored bubbles.