Bernardini Jacopo, Sen Uddalok, Jafari Gukeh Mohamad, Asinari Pietro, Megaridis Constantine M
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States.
Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, Italy.
ACS Appl Mater Interfaces. 2020 Apr 15;12(15):18046-18055. doi: 10.1021/acsami.9b22284. Epub 2020 Mar 31.
The interaction of rising gas bubbles with submerged air-repelling or air-attracting surfaces is relevant to various technological applications that rely on gas-microvolume handling or removal. This work demonstrates how submerged metal meshes with super air-attracting/repelling properties can be employed to manipulate microvolumes of air, rising buoyantly in the form of bubbles in water. Superaerophobic meshes are observed to selectively allow the passage of air bubbles depending on the mesh pore size, the bubble volume-equivalent diameter, and the bubble impact velocity on the mesh. On the other hand, superaerophilic meshes reduce or amplify the volume captured from a train of incoming bubbles. Finally, a spatial wettability pattern on the mesh is used to control the size of the outgoing bubble, and an empirical relation is formulated to predict the released gas volume. The study demonstrates how porous materials with controlled wettability can be used to precisely modulate and control the outcome of bubble/mesh interactions.
上升气泡与水下拒气或吸气表面的相互作用与各种依赖气体微体积处理或去除的技术应用相关。这项工作展示了具有超吸气/拒气特性的水下金属网如何用于操纵在水中以气泡形式向上漂浮的微体积空气。观察到超疏水网根据网孔尺寸、气泡体积等效直径和气泡对网的冲击速度选择性地允许气泡通过。另一方面，超亲水网减少或放大从一连串进入气泡中捕获的体积。最后，利用网上的空间润湿性模式来控制流出气泡的大小，并建立了一个经验关系式来预测释放的气体体积。该研究展示了具有可控润湿性的多孔材料如何用于精确调节和控制气泡/网相互作用的结果。
