Microbubbles have gained universal interest due to their wide applications in water treatment, cosmetics, and pharmaceutical industry and potential applications in gas–liquid reactions such as hydrogenation and oxidation. However, microbubble formation in organic solvents has been seldom investigated. A controllable and efficient platform is built to investigate microbubble formation in organic solvents using a hydrophilic ceramic membrane and a hydrophobic polytetrafluoroethylene (PTFE) membrane. The effect of membrane wettability on the size of microbubbles is studied with the change of the liquid property and membrane type. Experimental results show that the sizes of microbubbles are in ranges of 130–453 μm and 59–387 μm using the hydrophilic ceramic membrane and the hydrophobic PTFE membrane, respectively. Microbubbles generated in organic solvents using the hydrophilic ceramic membrane are much larger than those in water, and the size of microbubbles formed using the hydrophobic PTFE membrane shows an opposite trend. Furthermore, an equivalent pore is introduced to develop mathematical model to predict the microbubble size, which agrees well with the experimental data.

中文翻译：

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不同膜润湿性多孔膜在有机溶剂中微泡的产生

微气泡因其在水处理、化妆品和制药工业中的广泛应用以及在加氢和氧化等气液反应中的潜在应用而受到普遍关注。然而，很少研究有机溶剂中微泡的形成。使用亲水陶瓷膜和疏水聚四氟乙烯 (PTFE) 膜构建了一个可控且高效的平台，以研究有机溶剂中微气泡的形成。随着液体性质和膜类型的变化，研究了膜润湿性对微气泡大小的影响。实验结果表明，使用亲水性陶瓷膜和疏水性 PTFE 膜时，微气泡的尺寸分别在 130-453 μm 和 59-387 μm 范围内。使用亲水陶瓷膜在有机溶剂中产生的微气泡远大于在水中产生的微气泡，而使用疏水性聚四氟乙烯膜形成的微气泡大小则呈现相反的趋势。此外，引入等效孔来建立数学模型来预测微泡尺寸，这与实验数据非常吻合。