Coalescence, Growth, and Stability of Surface-Attached Nanobubbles
Coalescence, Growth, and Stability of Surface-Attached Nanobubbles
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DOI：
10.1021/acs.langmuir.5b01599
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发表时间：
2015-06-30
期刊：
影响因子：
3.9
通讯作者：
Ohl, Claus-Dieter
中科院分区：
文献类型：
--
作者：
Chan, Chon U.;Arora, Manish;Ohl, Claus-Dieter
表面附着的纳米气泡一旦形成并保持在恒定条件下，就显示出显著的抗溶解稳定性。当使用全内反射荧光（TIRF）显微镜观察大量纳米气泡时，我们发现罕见的聚结事件，即，两个相邻气泡的合并。新的气泡覆盖了他们“足迹”的凸起船体，三相接触线的大部分保持固定。有趣的是，新形成的气泡是形状不稳定，但在几个100毫秒内的高度增长。这种增长动态可以描述与经典的扩散理论，使用接触线钉扎和亨利定律。该理论还表明，在过饱和液体中，表面纳米气泡可以获得稳定的形状，接触角大于90。
Surface-attached nanobubbles once formed and kept under constant conditions Show remarkable stability against dissolution. When observing a large population of nanobubbles using total internal reflection fluorescence (TIRF), microscopy, we find rare events of coalescence, i.e., the merging of two neighboring bubbles. The new bubble covers the convex hull of their "footprint", with most of the three-phase contact line remaining pinned. Interestingly, the newly formed bubble is not shape-stable but grows in height within several 100 ms. This growth dynamic can be described with the classical diffusion theory using contact line pinning and Henry's law. This theory also shows that surface nanobubbles can attain a stable shape with a contact angle larger than 90 in supersaturated liquid.