The removal of microbubbles from substrates is crucial for the efficiency of many catalytic and electrochemical gas evolution reactions in liquids. The current work investigates the coalescence and detachment of bubbles generated from catalytic decomposition of hydrogen peroxide. Self-propelled detachment, induced by the coalescence of two bubbles, is observed at sizes much smaller than those determined by buoyancy. Upon coalescence, the released surface energy is partly dissipated by the bubble oscillations, working against viscous drag. The remaining energy is converted to the kinetic energy of the out-of-plane jumping motion of the merged bubble. The critical ratio of the parent bubble sizes for the jumping to occur is theoretically derived from an energy balance argument and found to be in agreement with the experimental results. The present results provide both physical insight for the bubble interactions and practical strategies for applications in chemical engineering and renewable energy technologies like electrolysis.

中文翻译：

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表面气泡聚结时的自推进分离

从基质中去除微泡对于液体中许多催化和电化学气体析出反应的效率至关重要。目前的工作研究了过氧化氢催化分解产生的气泡的聚结和分离。由两个气泡的聚结引起的自推进分离被观察到，其尺寸远小于由浮力确定的尺寸。聚结时，释放的表面能被气泡振荡部分消散，抵抗粘性阻力。剩余的能量转化为合并气泡平面外跳跃运动的动能。发生跳跃的母气泡尺寸的临界比率理论上来自能量平衡论证，并发现与实验结果一致。