Bionic self-driven water collection pattern capable of being applied to large-scale surface and preparation method of bionic self-driven water collection pattern

Abstract

The invention relates to a bionic self-driven water collection pattern capable of being applied to a large-scale surface and a preparation method of the bionic self-driven water collection pattern. The pattern is characterized in that a super-hydrophilic area is distributed on a super-hydrophobic surface, the super-hydrophilic area is composed of a bionic triangular lap-joint structure main channel, triangular secondary channels and net-shaped linear channels, the main channel is located in the center of the pattern, the secondary channels extend out of the two sides of the main channel and are asymmetrically distributed, the net-shaped linear channels are distributed around the main channel and the secondary channels, the net-shaped linear channels are composed of transverse parallel line type channels and inclined line type channels forming angles with the transverse parallel line type channels, the main channel is formed by multiple rows of single triangular structures in an up-down lap joint mode and in a left-right multi-column expansion mode, the bottoms of the upper row of triangular structures of a triangular lap joint structure are in lap joint with the narrow ends of the upper portions of the lower row of triangular structures, multi-row connection and multi-column expansion are formed according to the connection mode, and the bottoms of the triangular structures of the last row are provided with circular water storage areas connected with the triangular structures. The water collection pattern is processed by laser, and microstructure parameters can be precisely adjusted.

Description

technical field [0001] The invention relates to a bionic self-driving water collection pattern that can be applied to large-scale surfaces and a preparation method thereof, belonging to the technical field of water collection and superhydrophobic-superhydrophilic surfaces. Background technique [0002] Water is currently an essential resource for the daily activities of all living things on Earth. According to reports, two-thirds of the world's regions (about 4 billion people) are in a state of severe water shortage for at least one month every year, especially in arid and semi-arid regions, such as deserts, Gobi and other regions, which urgently need water resources for survival . Although seawater desalination technology has been used in various regions to alleviate the water shortage problem in some areas, it has been in a state of slow development due to expensive infrastructure and complicated seawater desalination technology. According to reports, the atmosphere cont...

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Problems solved by technology

For example, in the literature (Laser Direct Writing of Tree-Shaped Hierarchical Cones on a Superhydrophobic Film for High-Efficiency Water Collection) by Wang Meng et al., laser direct writing technology is used to prepare tree-like quadruple wedge-shaped hydrophobic patterns on superhydrophobic TiO2 films, which greatly improves the Water collection efficiency, the limitation is that the driving ability is poor, and the sizes of all levels are mutually restricted, so it is difficult to be flexibly applied and enlarged

Patent CN108816702A uses picosecond laser to prepare multi-level superhydrophilic vein network structure on superhydrophobic surface, which solves the problem of weak driving ability under a certain transportation distance. The distance cannot be transported because the radius of curvature is inversely proportional to the Laplace pressure difference. If the radius of curvature of the triangular structure is enlarged, the triangle structure will lose the Laplace pressure difference, and the condensate cannot be transported quickly, and the evaporation of the condensate will be lost. It will increase and reduce the water collection; at the same time, the complex patterned structure is not easy to prepare

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