Superhydrophobic Phenomenon In Plants And Preparation Of Superhydrophobic And Superamphiphobic Surfaces On Aluminum Alloy And Copper Alloy

In this thesis, the recent development of biomimetic superhydrophobic surface is reviewd, the new super-hydrophobic of ten plant leaves in nature by wettability test and analyze their structures by make use of scanning electron microscopy. Meanwhile, their surface chemical composition was studied by means of infra-redspectrum and X-ray photoelectron spectroscopy.Synergistic structures at micro-and nanometer scale were constructed simply on the surfaces of alloy by chemical etching. After modified with low surface energy compound, the surfaces with such structures exhibited excellent superhydrophobicities and superamphiphobi-cities.The aluminum alloy surfaces with micro-and nanostructures were fabricated by chemical etching method. After modification with ethylsilicone, the as-prepared surface shows super-hydrophobic property with the water contact angle could reach up to 159°and sliding angle smaller than 1°.The images and elements of the as-obtained surface was investigated by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. Meanwhile, the effects of the solution concentration, reaction time and relative humidity on the super-hydrophobicity were investigated, as well as the relationship between contact angle and different pH values of solution was studied. Moreover, the stability and corrosion resistance of the super-hydrophobic surface were also tested.There-dimensional and binary structures of aluminum alloy surface were fabricated by chemical etching method, after modification with palmitic acid. The as-prepared surface shows well super-hydrophobic property, with the water contact angle could reach up to 157°and sliding angle smaller than 3°.The images and elements of the as-prepared surface was investigated by scanning electron microscopy and X-ray photoelectron spectroscopy, the as-prepared super-hydrophobic surface meet the Cassie model. Simultaneously, the anti-adhesion of super-hydrophobic aluminum alloy surface was tested, as well as the anti-icing and anti-frosting characteristic were studied.Synergistic structures at micro-and nanometer scale were constructed simply on the surfaces of aluminum alloy and copper alloy by more effective chemical etching. After modified with perfluorooctanoic acid, the surfaces with such structures exhibited excellent superamphiphobicities. The contact angles of water and engine oil are 157.6°and 153.5°on aluminum alloy surface, and 155.3°and 150.4°on copper alloy surface, respectively. Meanwhile, the sliding angles are very low. In order to understand the detail of this chemical process, a series of experiments have been performed under different experiment conditions including different soak time and solution concentration.the superamphiphobic surface meet the Cassie model. In addition, the corrosioin and electrochemical properties of as-prepared surface were tested.