Preparation of the Thermal-assisted Self-healing Bionic Super Slippery Surface on Aluminum Alloy Substrate and the Effect of Lubricant on Its Performance

The super slippery surface inspired by Nepenthes shows excellent properties such as liquid repellency and antifouling. However, when the lubrications film on the bionic super slippery surface is damaged, its super slippery property will be destroyed. Therefore, preparation of bionic super slippery surfaces with self-healing properties is crucial to solve the problem of poor durability. This paper first uses anode oxidation method to prepare a tapered microstructure on the surface of the aluminum alloy substrate, then uses perfluorosilane for low-energy modification, and finally injects three different lubrications of perfluoropolyether, low-viscosity silicone oil and high-viscosity silicone oil into the microstructure gap. Three bionic super slippery surfaces are obtained. The contact angles of water droplets on these three bionic super slippery surfaces are similar to 116 degrees, similar to 105 degrees and similar to 103 degrees, respectively, and the sliding angles are similar to 10 degrees, similar to 10 degrees, and similar to 9 degrees, respectively. The experimental results indicate that the bionic super slippery surfaces with perfluoropolyether and low-viscosity silicone oil show better self-cleaning and antifouling properties than the bionic super slippery surface with high-viscosity silicone oil, which can effectively prevent the failure of liquid repellency caused by the accumulation of pollutants. In addition, the bionic super slippery surface with perfluoropolyether and low-viscosity silicone oil show excellent thermal-assisted self-healing property, and the hydrophobicity after heal is basically the same as that of newly prepared samples. However, the bionic super slippery surface with high-viscosity silicone oil only shows a certain degree of self-healing, and the hydrophobicity of the healed sample is different from that of the newly prepared sample. Therefore, the prepared bionic super slippery surfaces on aluminum alloy substrate with thermally assisted self-healing property would show potential application prospect in marine anti-biofouling. A solution is providef for overcoming the poor durability of the traditional bionic super slippery surface.