Tan Beng Hau, An Hongjie, Ohl Claus-Dieter
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore.
Low Energy Electronic Systems, Singapore-MIT Alliance for Research and Technology, 1 Create Way, 138602 Singapore.
Phys Rev Lett. 2020 Apr 3;124(13):134503. doi: 10.1103/PhysRevLett.124.134503.
The existence of bulk nanobubbles has long been regarded with scepticism, due to the limitations of experimental techniques and the widespread assumption that spherical bubbles cannot achieve stable equilibrium. We develop a model for the stability of bulk nanobubbles based on the experimental observation that the zeta potential of spherical bubbles abruptly diverges from the planar value below 10 μm. Our calculations recover three persistently reported-but disputed-properties of bulk nanobubbles: that they stabilize at a typical radius of ∼100 nm, that this radius is bounded below 1 μm, and that it increases with ionic concentration.
由于实验技术的局限性以及普遍认为球形气泡无法实现稳定平衡的观点，大量纳米气泡的存在长期以来一直受到质疑。基于实验观察结果，即球形气泡的zeta电位在直径小于10μm时会突然偏离平面值，我们建立了一个关于大量纳米气泡稳定性的模型。我们的计算重现了大量纳米气泡一直被报道但存在争议的三个特性：它们在典型半径约为100nm时达到稳定，该半径下限为1μm，并且会随着离子浓度的增加而增大。
