Scheid B, Zawala J, Dorbolo S
TIPs, Fluid Physics Unit, Université Libre de Bruxelles, B-1050 Bruxelles, Belgium.
Soft Matter. 2014 Sep 28;10(36):7096-102. doi: 10.1039/c4sm00718b.
Antibubbles are ephemeral objects. Their lifetime is driven by the slow drainage of the air shell from the bottom to the top of the antibubble under the action of hydrostatic pressure. We show in this paper that this argument is only valid if the water used to make the surfactant mixture is saturated in air. Otherwise, two paths are used by the air, which conduct to the thinning and the eventual collapse of the air shell: the drainage from the bottom to the top of the antibubble and the dissolution of the air into the liquid. Using degassed water dramatically shortens the lifetime of the antibubbles, as observed experimentally and rationalised by time-dependent simulations. Consequently, the antibubble lifetime is not only correlated with physical and chemical properties of the air-liquid interface but also with the gas content of the liquid. We also show that pure gas dissolution does not depend on the antibubble radius, a behaviour that allows to rationalise unexplained experimental data found in literature.
反气泡是短暂存在的物体。它们的寿命受静水压力作用下空气壳从反气泡底部缓慢排至顶部的过程驱动。我们在本文中表明，只有当用于制备表面活性剂混合物的水在空气中饱和时，这一观点才成立。否则，空气会通过两条路径导致空气壳变薄并最终坍塌：从反气泡底部到顶部的排水过程以及空气溶解到液体中。实验观察到，使用脱气水会显著缩短反气泡的寿命，并且通过时间相关模拟对此进行了合理的解释。因此，反气泡的寿命不仅与气液界面的物理和化学性质相关，还与液体中的气体含量有关。我们还表明，纯气体溶解不依赖于反气泡半径，这一行为有助于合理解释文献中未解释的实验数据。
