Study On Preparation Of Wettability Micro-nano Structure And Anti-icing Characteristics Of Femtosecond Laser

In terms of surface icing,many industries have been affected by it and have had severe adverse effects.The most typical ones are wind power and aviation industries.Therefore,studying the preparation of material surfaces with excellent anti-icing properties is significant.Based on the synergistic effect of chemical composition and microstructure,the surface of superhydrophobic micro-nano structure can achieve a high probability of droplet detachment and extremely low heat transfer efficiency,which is very beneficial to improve the anti-icing performance of the surface.Therefore,in recent years,researchers at home and abroad have focused on developing anti-icing performance on the surface of superhydrophobic micro-nano structures.Its working process saves energy and is an ideal technical solution to the current icing problem.As an efficient,flexible,and controllable surface preparation method for micro-nano structures,femtosecond laser micro-nanofabrication has broad application prospects regarding material surfaces’ wettability and anti-icing properties.This paper uses this technology to prepare micro-nano-structured surfaces with different structure types and systematically studies its influence on materials’ wettability and anti-icing performance.The material surface’s hydrophobic and anti-icing performance have been successfully improved by designing and optimizing the microstructure.The specific research contents and conclusions are as follows:(1)Groove structure,square column structure,and independent air cavity structure surface with different structure pitches were prepared on nickel surface by femtosecond laser.The fine control of the microstructure is realized by adjusting the processing parameters such as laser energy,scanning speed and scanning mode of the femtosecond laser.The anisotropic wetting properties of each structured surface were experimentally explored.The relationship between the wetting properties of each structured surface and the structure type and the proportion of solid-liquid contact area was analyzed.(2)Based on the relationship mentioned above between surface wettability,structure type,and solid-liquid contact area ratio,the advantage of femtosecond laser directional and controllable processing is used to construct a new type of micro-nano structure with air cavity structure on the nickel surface.The effects of different air cavity structure types on surface wettability and anti-icing performance were also explored.They combine the layered condensation observation experiment in a low-temperature environment and the surface Laplace pressure test experiment,the surface Cassie state maintenance of various air cavity structure types.The difference in anti-icing performance between different air cavity structure types is attributed to the extra stability of different air cavity structure types in maintaining the Cassie state of the droplet contact interface.In summary,this paper conducted experiments on the preparation of superhydrophobic micro-nano structures on femtosecond laser surfaces,conducted systematic research on the analysis of surface wettability mechanism and anti-icing applications,and obtained relevant experimental results.These research results provide an essential reference for applying femtosecond laser superhydrophobic micro-nano structured surface in anti-icing,especially for developing anti-icing technology in aviation,wind power,and other industrial fields.