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Related Experiment Videos

Superstability of surface nanobubbles.

Bram M Borkent1, Stephan M Dammer, Holger Schönherr

  • 1Physics of Fluids, Faculty of Science and Technology and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Physical Review Letters
|August 7, 2007
PubMed
Summary
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Surface nanobubbles on polyamide and silicon surfaces resist cavitation. These nanobubbles remain stable even under extreme pressure drops, a phenomenon termed superstability.

Area of Science:

  • Surface science
  • Fluid dynamics
  • Nanotechnology

Background:

  • Surface nanobubbles are prevalent on various substrates in aqueous environments.
  • Their role in cavitation phenomena, particularly under reduced pressure, remains poorly understood.
  • Understanding nanobubble behavior is crucial for applications involving interfaces and pressure changes.

Purpose of the Study:

  • To investigate the behavior of surface nanobubbles during shock wave induced cavitation.
  • To determine if surface nanobubbles act as nucleation sites for cavitation bubbles.
  • To assess the stability of surface nanobubbles under significant negative pressure.

Main Methods:

  • Performing shock wave induced cavitation experiments.
  • Utilizing atomic force microscopy (AFM) to characterize surfaces and nanobubbles.

Related Experiment Videos

  • Immersing flat polyamide and hydrophobized silicon surfaces in water.

    • Main Results:

    • Surface nanobubbles were observed on both polyamide and hydrophobized silicon surfaces.
    • Contrary to expectations, these nanobubbles did not serve as nucleation sites for cavitation bubbles.
    • Nanobubbles exhibited remarkable stability even when the liquid pressure was reduced to -6 MPa.

    Conclusions:

    • Surface nanobubbles demonstrate exceptional stability under conditions of extreme negative pressure.
    • This stability, termed 'superstability,' suggests nanobubbles are robust structures not easily disrupted by cavitation.
    • The findings challenge existing models of cavitation nucleation and highlight the unique properties of surface nanobubbles.