Knudsen gas provides nanobubble stability

Details Knudsen gas provides nanobubble stability Knudsen gas provides nanobubble stability

2011-09-08

arxiv.org/abs/1109.1652v1

PRL 107, 116101 (2011)

Physics

Fluid Dynamics

Scientific paper

10.1103/PhysRevLett.107.116101

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 $\sim3.3\,\mathrm{m/s}$, in good agreement with our experimental atomic force microscopy measurement of $\sim2.7\,\mathrm{m/s}$. In addition, our model also predicts an upper bound for the size of nanobubbles, which is consistent with the available experimental data.

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