The superhydrophobicity of solid surfaces is primarily dependent on low surface energy and surface microstructure. In order to prepare a low-wetting surface, a micro-column array was constructed on the surface of aluminum by micro-milling and grinding, and the influence of the square-column structure on the surface wettability of the material was analyzed. Milling will cause burrs on the surface of the square column. Under the joint action of the square columns and the burrs on the surface, the contact angle of the material surface increased from 50.3° to 98.4°. After grinding, the burr on the surface of the square column disappears, but the irregular secondary groove structure is formed at the top of the groove, which further improves the contact angle of the surface of the test piece (127.8°). On the whole, the construction of the micro-column structure enhances the hydrophobic properties of the aluminum alloy surface. The micro-grinding square column structure can further realize the transition of the wettability of the aluminum alloy surface from hydrophilic to hydrophobic, and the contact state of the water droplet on the surface thereof is in the transition state of Wenzel and Cassie.
#1Jing Li(Changchun University of Science and Technology)H-Index: 1
#2ShiCai Zhao(Changchun University of Science and Technology)H-Index: 1
Last. HuaDong Yu(Changchun University of Science and Technology)H-Index: 1
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With the continuous exploration of the special morphologies and properties of skin of some animals and plant leaf surfaces in the nature, new hydrophobic surfaces are developed through imitation of the observed surface effects. The aluminum alloy surface which is similar to multi-scale hierarchical structure surface of biomimetic rice leaf can be obtained by combining high speed wire electrical discharge machining (WEDM) method and electric brush-plating technique. The morphological feature was ...
It has been expected that superhydrophobic (SHP) surfaces could have potential anti-icing applications due to their excellent water-repellence properties. However, a thorough understanding on the anti-icing performance of such surfaces has never been reported; even systematic characterizations on icing behavior of various surfaces are still rare because of the lack of powerful instrumentations. In this study, we employed the electrochemical anodic oxidation and chemical etching methods to simpli...
Nanocasting technique was used to obtain a biomimetic superhydrophobic electroactive polyimide (SEPI) surface structure from a natural Xanthosoma sagittifolium leaf. An electroactive polyimide (EPI) was first synthesized through thermal imidization. An impression of the superhydrophobic Xanthosoma sagittifolium leaf was then nanocasted onto the surface of the EPI so that the resulting EPI was superhydrophobic and would prevent corrosion. Polydimethylsiloxane (PDMS) was then used as a negative te...
To simulate the hydrophobic microstructure of cicada wing surface,a high speed precise micromilling machine was used to fabricate columnar microstructure arrays on aluminum alloy substrate.Microstructure,hydrophobicity and surface roughness of bionic specimen were investigated,and the hydrophobic mechanism of bionic specimen was analyzed.The results show that the columnar microstructure arrays can effectively improve the hydrophobic properties of aluminum alloy,and the contact angle value is imp...
High-accuracy three-dimensional miniature components and microstructures are increasingly in demand in the sector of electro-optics, automotive, biotechnology, aerospace and information-technology industries. A rational approach to mechanical micro machining is to develop ultra-precision machines with small footprints. In part 1 of this two-part paper, the-state-of-the-art of ultra-precision machines with micro-machining capability is critically reviewed. The design considerations and specificat...
#1Uwe Teicher(TUD: Dresden University of Technology)H-Index: 6
#2Amitava Ghosh(IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 21
Last. K. Künanz(TUD: Dresden University of Technology)H-Index: 2
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Abstract This paper deals with an investigation of the grindability of Titanium alloy Ti–6Al–4V with monolayered brazed type superabrasive grinding wheels. The experiments, conducted under different grinding environments, showed the performance of the grinding fluids based on an evaluation of grinding forces, chip formation and tool condition. It could be found that conventional grinding fluids like oil or alkaline soap are preferable compared to dry or cryogenic conditions or with MoS 2 coated ...
