| Humans have studied the uniqueness of the surface structure of animals and plants in nature,and more and more researchers have been inspired by it to study bionic materials.At present,how to prepare micro-nano structure interfaces with special functions has become an urgent problem to be solved.In this paper,the nanosecond laser micro-nano processing technology and the principles involved in the field of bionic,according to the material characteristics and the corresponding chemical modification and combined with the actual engineering application requirements,aluminum foil is used as the substrate to prepare microstructures with special wettability.Firstly,the main components of the nanosecond laser micro-nano processing system and the mechanism of interaction between the nanosecond laser and metal surface are described.Based on the finite element multi-physical field simulation software COMSOL Multiphysics version 5.4,the penetration processes of wetting water in single-hole channel with different wettability were studied.Several wettabilities of aluminum foil films under different process parameters were explored:(super)hydrophilic/(super)hydrophilic,(super)hydrophobic/(super)hydrophobic,(super)hydrophobic/(super)hydrophilic.The effect of surface microstructures on its wetting properties and fog collection ability of(super)hydrophilic/(super)hydrophobic aluminum foil films were studied.The main content of this article is as follows:(1)The basic concept of wettability is expounded.The significance and current research status of fog collection as well as the research status and application of wettability on aluminum surface are analyzed.It is pointed out that it is necessary to use the uniqueness of biological surface structure to prepare microstructures for wettability and fog collection.(2)In the experiment,the components of the nanosecond fiber laser system were further described,and the physical process of nanosecond laser irradiation on the metal surface was analyzed.(3)Based on the simulation software COMSOL,a model was built to carry out dynamic simulation,analyze the wetting state of water in a single-pore channel with differentwettability,and the effect of different micro-channel structure sizes on the transmission rate of water under different microchannel sizes was explored.(4)Based on the current situation and application of droplet transmission in fluid control,wettability film is proposed to be used in droplet transmission and fog water collection experiments.(Super)hydrophilic/(super)hydrophilic,(super)hydrophobic/(super)hydrophobic,(super)hydrophobic/(super)hydrophilic Janus mesh of aluminum foil films were prepared.The wetting state of different wettability micro-structure surface to water was studied.The transport speed of water droplets in different wettability micro-structure surface is explored and the mechanism of water penetration and interception by different wettability films is analyzed.The(super)hydrophobic/(super)hydrophilic aluminum foil films in three kinds of films showed unique wetting ability,and their fog collection ability under the condition of the same through-hole quantity and different top pore size was studied.The results show that different pore sizes affect the function of fog collecting with the same amount of through-holes,the maximum fog collection of the(super)hydrophobic/(super)hydrophilic aluminum foil film is about 31.3 times higher than the smallest.In this paper,different wettability aluminum foil films prepared by nanosecond laser play a unique role in droplet transmission and fog collection,which has a certain impact on exploring the influence of surface micro-structures on its performance and applications. |
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