Fabrication and Coupling Mechanism of Super-hydrophobical Aluminium Alloy Surface
Wang Yan-lin
2014
Citations
3
Citations
Journal
China Surface Engineering
Semantic Scholar
Key Takeaway Key Takeaway: Super-hydrophobic aluminum alloy surfaces can be fabricated by copying the bionic groove structure of rice leaves, which improves wettability and adhesion properties.
Abstract
To fabricate super-hydrophobic aluminum alloy surface,bionic groove structure of rice leaf on the aluminum alloy surface was copied by means of high speed wire cut electrical discharge machine.The surface morphologies,structure,wettability and adhesion of the aluminum alloy surface were studied using scanning electronic microscope(SEM)and the interface contact angle was measured,respectively.The results show that surface consists of micro-scale grooves in a regular arrangement covered by micro-scale pits,processes and nano-scale staggered floor structure.The wettability of the surface changes from hydrophilicity(the contact angle is 61.24°)to super-hydrophobicity(the contact angle is 157.71°),and the biggest contact angle of the resulting surface reaches 165.36°.Czochralski method shows that the specimen surface is high-adhesive.By comparing the experimental results with that from the theoretical Cassie model,it can be found that the super-hydrophobic surface of the specimen is the coupling result of micro-and nano-scale composite structures.Multi-scale structures of aluminum alloy surface not only improve the hydrophobic properties,but also form the high-adhesion properties of material surface.