The manipulation of underwater bubble using the superwetting surface is crucial for industrial and scientific research. However, most of the superwetting surfaces are not able to achieve precise control for underwater bubble transportation. Here, a new method was proposed to construct a superaerophobic wedge pattern on superaerophilic wedge surface for precise underwater bubble transportation. The pattern was fabricated on the aluminum plate for underwater bubble transportation by the secondary laser etching and fluoroalkylsilane modification techniques. In this study, the wedge angle and the length of superaerophobic wedge pattern were investigated for the underwater bubble transportation on the superaerophilic wedge surface, and the results showed that the transportation distance of underwater bubbles could be precisely controlled by adjusting the wedge angle and the length of superhydrophobic wedge pattern.
With the development of science and technology, hole structures are widely used in many industrial fields, such as engine fuel nozzle, turbine blade air film cooling hole, etc. Traditional electrochemical machining can be used to fabricate the hole structures. However, an insulating layer must be coated on the tube electrode. The use of the insulating layer would degrade the quality of the fabricated hole structures. Here, we proposed to fabricate the hole structures by using superhydrophobic tube electrode. First, the superhydrophobic tube electrode was fabricated by laser ablation and low surface energy modification. Then, we investigated the influence of the voltage and feed rate on the radial overcut of the hole structures. Our superhydrophobic tube electrode is expected to be used in the fabrication of the hole structures.
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