Journal
APPLIED SURFACE SCIENCE
Volume 471, Issue -, Pages 999-1004Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.12.094
Keywords
Unidirectional transportation; Shape-gradient; Self-driven; Gas bubbles; Femtosecond laser
Categories
Funding
- 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]
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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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