Hydrophilic/hydrophobic area synergistic water-collecting patterned surface and preparation method thereof

Abstract

The invention belongs to the field of metal surface modification, and particularly relates to a hydrophilic / hydrophobic area synergistic water-collecting patterned surface and a preparation method thereof. The surface involves constructing a super-hydrophilic pattern of a tree-like array structure on a super-hydrophobic copper substrate, wherein the tree-like array structure is formed by the up and down connection of a plurality of patterns with shape gradient. The method comprises the following steps of cleaning the surface of a copper sample; corroding the cleaned copper surface through using alkaline solution; conducting low surface energy chemical modification on a super-hydrophilic copper surface; and using optical fiber laser to conduct ablating a pattern with the tree-like array structure on a super-hydrophobic copper surface so as to obtain the super-hydrophilic pattern, and finally the hydrophilic / hydrophobic area synergistic water-collecting patterned surface can be obtained.According to the hydrophilic / hydrophobic area synergistic water-collecting patterned surface and the preparation method thereof, the defects of large aggregation of droplets in a single hydrophilic area, low nucleating density in a single hydrophilic area and the like are solved; and in addition, the super-hydrophilic pattern has shape gradient, so when the surface is vertically placed, under thedual effects of the Laplace pressure and gravity force, the droplets in a single hydrophilic area can quickly fall off from the surface, thus achieving high efficiency in water collecting.

Description

technical field [0001] The invention belongs to the field of metal surface modification, in particular to a surface with patterned hydrophilic / hydrophobic regions for synergistic water collection and a preparation method thereof. Background technique [0002] The shortage of fresh water resources is an important problem facing today's society, so designing efficient water collection schemes has important application value. In recent years, people have designed a series of water collection devices by imitating the water collection method of mixed hydrophilic / hydrophobic regions on the surface of animals and plants. CN1872533A, CN207003543U, CN107700591A, CN104196084A and other patents are inspired by the beetle, adding a series of hydrophilic raised particles on the hydrophobic substrate to make a bionic water collection device. However, since the hydrophilic particles and the hydrophobic substrate are not of the same material, they are prone to fall off, resulting in damage...

AI Technical Summary

Problems solved by technology

Although the surface can automatically drive the directional transport of droplets, the droplets will eventually accumulate in a large number in the super-hydrophilic sink area, and it is difficult to quickly detach from the surface, and the degree of improvement in the surface water collection efficiency is very limited.

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