Dai Xin, Guo Zhiguang, Liu Weimin
Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
ACS Appl Mater Interfaces. 2022 Sep 21;14(37):42734-42743. doi: 10.1021/acsami.2c12766. Epub 2022 Sep 7.
Understanding the behavior of underwater bubbles and enabling their effective manipulation is important for bubble capture, collection, and transport. Here, to discuss the underwater permeation behavior of bubbles and critical influencing parameters in this process, the copper foams with tunable wettability were fabricated by utilizing the light-stimulated wettability response of TiO. The Janus copper foams had different wettability gradients from superhydrophobic/hydrophobic to superhydrophobic/hydrophilic after UV irradiation at different times, and the bubbles on the surfaces showed distinctly diverse penetration behaviors. In particular, the constructed superhydrophobic/hydrophilic surfaces showed more difficult to achieve bubble penetration than the fully superhydrophobic, superhydrophobic/hydrophobic surface. It was found that the wetting states of the foams exposed to different irradiation times underwater plays a crucial role in the bubble penetration behavior. In other words, the difficulty of bubble penetration depends on the difficulty of bubble transition from gas-liquid contact to gas-solid contact. This facile and low-cost fabrication approach for Janus foams provided a valuable approach to understand the penetration behaviors of underwater bubbles, which is significant for expanding potential applications in bubble capture, bubble transport, and control of unstable gas reactions in underwater conditions.
了解水下气泡的行为并实现对其有效操控对于气泡捕获、收集和运输至关重要。在此，为了探讨气泡的水下渗透行为以及该过程中的关键影响参数，利用TiO的光刺激润湿性响应制备了具有可调润湿性的泡沫铜。经过不同时间的紫外线照射后，双面泡沫铜具有从超疏水/疏水到超疏水/亲水的不同润湿性梯度，并且表面上的气泡表现出明显不同的渗透行为。特别是，所构建的超疏水/亲水表面比完全超疏水、超疏水/疏水表面更难实现气泡渗透。研究发现，泡沫在水下暴露于不同照射时间的润湿状态在气泡渗透行为中起着关键作用。换句话说，气泡渗透的难易程度取决于气泡从气液接触转变为气固接触的难易程度。这种用于双面泡沫的简便且低成本的制造方法为理解水下气泡的渗透行为提供了一种有价值的方法，这对于扩大在气泡捕获、气泡运输以及水下不稳定气体反应控制方面的潜在应用具有重要意义。
