Research On The Preparation Of Superhydrophobic Surfaces With Gradient Microcone Structure And Its Anti-icing/deicing Performance In Imitation Of Arrow Bamboo Leaf

Icing and ice accumulation pose significant hazards to human daily life and industrial applications,resulting in a significant demand for anti-icing/deicing surfaces.With the progress of science and technology,surface structuring technology,one of the key factors in constructing superhydrophobic surfaces,has developed rapidly,making superhydrophobic surfaces gradually enter people’s lives.Superhydrophobic surfaces have proven to be icephobic due to their unique water repellency.However,it is susceptible to the intrusion of liquids into micro and nano structures in cold and humid environments,resulting in icing selflocking and thus limiting its practical application.Therefore,the adoption of rational structural design and preparation strategies is essential to enhance the anti-icing/deicing performance of superhydrophobic surfaces.How to make superhydrophobic surfaces with condensate droplet self-removal properties,high delayed icing properties,and ultra-low ice adhesion properties is important to promote the application of superhydrophobic engineering surfaces for antiicing/deicing in complex cold environments.Inspired by the structure and function of the gradient microprotrusions on the back of the arrow bamboo leaf,this thesis has precisely constructed a gradient microcones array structure on an engineered aluminum surface through a green fabrication strategy combining femtosecond laser processing technology with hydrothermal treatment.After further surface modification,a superhydrophobic surface with an excellent anti-icing/deicing effect of the gradient microcone structure was prepared.The wettability of the prepared surface was characterised by droplet bounce experiments and contact angle measurements,and the results showed superhydrophobicity with a contact angle as high as 165° and a sliding angle of only1.61°.The surface structure and composition were analysed and characterised using field emission scanning electron microscopy,optical profilometry,and energy dispersive X-ray spectroscopy.The results show that the special gradient microcone structure of the surface and the dense nano-layers covering it can effectively expand the cavitation and enhance the stability,resulting in excellent Cassie stability of the surface.To investigate the anti-icing and deicing properties of a gradient microcone structured superhydrophobic surface,microdroplet condensation tests,anti-icing tests,and deicing tests were carried out on the surface.The results show that the surface has excellent self-removal properties of condensate droplets after bouncing,delayed icing properties,and ultra-low ice adhesion properties.The influence of the level of gradient microcones on the anti-icing and deicing performance of the surface was also investigated,with the best results being obtained for surfaces with a two-level gradient.The stability and durability of the anti-icing and deicing properties of the surface are demonstrated through icing/deicing cycle tests,water impact tests,and chemical corrosion resistance tests.The practical utility of the surface is further demonstrated by simulated application experiments.The proposed superhydrophobic surface with a gradient microcone structure provides a new idea for the design of integrated anti-icing and deicing surfaces and will further promote the development of passive anti-icing and deicing superhydrophobic surfaces.