Physics of Fluids, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Phys Rev Lett. 2011 Sep 9;107(11):116101. doi: 10.1103/PhysRevLett.107.116101. Epub 2011 Sep 6.
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.
我们为表面纳米气泡对体相溶解的显著稳定性提供了一个模型。该解决方案的关键在于纳米气泡中的气体为克努森型。这导致了体相液体流的产生，有效地迫使扩散气体保持局部化。我们的模型预测了在纳米气泡上方存在一个垂直的水流，其估计速度约为 3.3 m/s，与我们实验原子力显微镜测量的约 2.7 m/s 非常吻合。此外，我们的模型还预测了纳米气泡的最大尺寸，这与现有的实验数据一致。
