Jin Shaobo, Wei Xueyong, Yu Ziyi, Ren Juan, Meng Zhijun, Jiang Zhuangde
State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, 30 Puzhu South Road, Nanjing 211816, China.
ACS Appl Mater Interfaces. 2020 May 13;12(19):22318-22326. doi: 10.1021/acsami.0c02118. Epub 2020 Apr 14.
Porous materials have a variety of applications such as catalysis, gas separation, sensing, tissue engineering, sewage treatment, and so on. However, there are still challenges in the synthesis of porous materials with light weight, high porosity, and superhydrophobicity. Herein, we demonstrate one acoustic-controlled microbubble generation method, which is used to synthesize 3D polymer porous materials. The acoustic-controlled microbubble generation based on focused surface acoustic wave (FSAW) is suitable for not only the generation of gas-in-oil microbubbles but also the gas-in-water microbubbles. The size of microbubbles can be real-time controlled by adjusting the frequency or the driving voltage of the FSAW. The as-prepared poly(vinyl alcohol) (PVA) foams composed of microbubbles can be used as a template to fabricate the PVA-based porous gel materials through freezing-thawing cyclic processing, and the various sized bubbles result in different porosity of the PVA-based porous gel materials. Moreover, excellent properties like oleophilicity and superhydrophobicity of the PVA-based porous gel materials can be obtained through a further hydrophobic modification treatment. The oil/water separation experiments have been done to demonstrate the good absorption and reliability of the modified porous gel materials, which are capable of multiple uses.
多孔材料有多种应用，如催化、气体分离、传感、组织工程、污水处理等。然而，在合成具有轻质、高孔隙率和超疏水性的多孔材料方面仍存在挑战。在此，我们展示了一种声控微泡生成方法，该方法用于合成三维聚合物多孔材料。基于聚焦表面声波（FSAW）的声控微泡生成不仅适用于油包气微泡的生成，也适用于水包气微泡的生成。通过调节FSAW的频率或驱动电压，可以实时控制微泡的大小。由微泡组成的制备好的聚乙烯醇（PVA）泡沫可作为模板，通过冻融循环处理制备基于PVA的多孔凝胶材料，不同大小的气泡导致基于PVA的多孔凝胶材料具有不同的孔隙率。此外，通过进一步的疏水改性处理，可以获得基于PVA的多孔凝胶材料的亲油性和超疏水性等优异性能。已经进行了油/水分离实验，以证明改性多孔凝胶材料具有良好的吸附性和可靠性，并且能够多次使用。
