Composite structure film based on double-gradient tapered hole array, and preparation method thereof

Abstract

The invention discloses a composite structure film based on double-gradient tapered hole array, and a preparation method thereof, and relates to a composite structure film and a preparation method thereof. The problems that a water drop self-drive effect for the self-driven water mist collecting film is unsatisfactory and the self-drive energy source is single are solved. By combining the femto-second laser drilling technology with the low-surface energy modification technology, the efficient and quick processing of the tapered hole array with the morphology gradient and the surface energy gradient can be realized by adjusting a laser pulse impact parameter and a focus space location. The structure can spontaneously change the own state of the water drop to accomplish the self-drive conveying process from an upper surface to a lower surface. The upper surface and the lower surface of a composite structure aluminum foil prepared by the invention have super-hydrophobic performance and super-hydrophilic performance. Three gradient elements are existent in the micropore from a top end to a bottom end, three gradient elements are roughness, surface energy and section radius; and three gradients endow the capacity for spontaneously transferring to the lower surface from the upper surface of the aluminum foil for the droplet. The composite structure film disclosed by the invention isapplied to the mist treatment.

Description

technical field [0001] The invention relates to a membrane based on a composite structure and a preparation method thereof. Background technique [0002] With the continuous growth of population and the increasing shortage of fresh water resources, how to quickly obtain fresh water resources has become a difficult problem for researchers. The fresh water resources in the air can be replenished continuously through the atmospheric circulation, which is an inexhaustible source of fresh water. Inspired by the epidermis structure of some biological bodies in nature, the use of materials for water wettability to harvest water from the air has attracted people's attention. For example: the unique multi-level water droplet condensation-collection-transportation-absorption structure of cactus can effectively absorb water from the air and transport it to the roots; The superhydrophilic region is condensed and transported into the body etc. through the superhydrophobic region. Thes...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of unsatisfactory self-driving effect on self-driven water mist collection film droplets and single source of self-driven energy, and provide a multi-function device that can take into account the condensation, collection, transfer and preservation of mist water. Integrated high-efficiency self-driven composite structure membrane structure

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