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Phys Rev Lett. 2011 Sep 9;107(11):116101. Epub 2011 Sep 6.

Knudsen gas provides nanobubble stability.

Author information

1
Physics of Fluids, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. j.r.t.seddon@utwente.nl

Abstract

We provide a model for the remarkable stability of surface nanobubbles to bulk dissolution. The key to the solution is that the gas in a nanobubble is of Knudsen type. This leads to the generation of a bulk liquid flow which effectively forces the diffusive gas to remain local. Our model predicts the presence of a vertical water jet immediately above a nanobubble, with an estimated speed of ∼3.3  m/s, in good agreement with our experimental atomic force microscopy measurement of ∼2.7  m/s. In addition, our model also predicts an upper bound for the size of nanobubbles, which is consistent with the available experimental data.

PMID:
22026686
DOI:
10.1103/PhysRevLett.107.116101
[Indexed for MEDLINE]
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