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    Femtosecond laser fabrication of shape-gradient platform: Underwater bubbles continuous self-driven and unidirectional transportation

    Year: 2019

    Journal: Appl. Surf. Sci., Volume 471, Nov-31, page 999–1004

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

    Organizations: National Natural Science Foundation of China [51805553]; 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]

    Keywords: Unidirectional transportation; Shape-gradient; Self-driven; Gas bubbles; Femtosecond laser

    The capture and directional transportation of gas bubbles in an aqueous environment are important aspects of modern science and technology including methane harvesting, CO2 capture/reduction and electrochemical H-2 generation and collection. However, designing and fabricating a device that functions to both harvest air bubbles from the aqueous solution and to directionally transport those bubbles with no external force remains a challenge. In this work, we develop a facile method to fabricate micro/nanoscale hierarchical structures on a trapezoidal platform using femtosecond laser direct cutting and surface structuring technology. The geometry-gradient platform surface exhibits superhydrophobicity in air and superaerophilicity in water and allows air bubbles to self-transport from the minor side onto the large side but not in the opposite direction. Furthermore, the as-prepared platform exhibits robust stability in corrosion and friction tests. In addition, a superaerophilic trapezoidal platform with a cross-shaped structure is developed that spontaneously captures, unidirectionally transports, and collects bubbles in a supersaturated gas solution. This superaerophilic trapezoidal platform exhibits tremendous potential in applications for advanced self-driven transport devices and is a promising tool in solving energy and environment problems.
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