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    Robust laser-structured asymmetrical PTFE mesh for underwater directional transportation and continuous collection of gas bubbles

    Year: 2018

    Journal: Appl. Phys. Lett., Volume 112, JUN 11

    Authors: Yin, Kai; Yang, Shuai; Dong, Xinran; Chu, Dongkai; Duan, Ji-An; He, Jun

    Organizations: National Key R&D Program of China [2017YFB1104801]; Natural Science Foundation of Hunan Province [2018JJ3666]; Open Research Fund of State Key Laboratory of High Performance Complex Manufacturing, Central South University [Kfkt2017-12]

    We report a simple, efficient method to fabricate micro/nanoscale hierarchical structures on one side of polytetrafluoroethylene mesh surfaces, using one-step femtosecond laser direct writing technology. The laser-treated surface exhibits superhydrophobicity in air and superaerophilicity in water, resulting in the mesh possessing the hydrophobic/superhydrophobic asymmetrical property. Bubbles can pass through the mesh from the untreated side to the laser-treated side but cannot pass through the mesh in the opposite direction. The asymmetrical mesh can therefore be designed for the directional transportation and continuous collection of gas bubbles in aqueous environments. Furthermore, the asymmetrical mesh shows excellent stability during corrosion and abrasion tests. These findings may provide an efficient route for fabricating a durable asymmetrical mesh for the directional and continuous transport of gas bubbles. Published by AIP Publishing.
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