Surface preparation method combining wave forms and chemical gradients

Abstract

The invention discloses a surface preparation method combining wave forms and chemical gradients. The surface preparation method includes the steps: (1) preparing coating solution; (2) preparing mask plates; (3) spin-spraying the coating solution; (4) preparing flexible wave structures; (5) preparing baffle plates; (6) preparing surfaces combining the chemical gradients and the flexible wave structures. According to the method, stress directions of two sides of flexible materials generate wave structures, so that movement barriers of two sides of liquid drops are improved, micro-structure surfaces of the chemical gradients are acquired by the aid of plasma treatment, so that the liquid drops are unidirectionally spread, wetting properties of the liquid drops can continuously change along the inclined direction, and the liquid drops are easily and bidirectionally spread to form band shapes by the aid of the wave structures.

Description

technical field [0001] The invention belongs to the field of material surface modification and relates to a surface preparation method combining wave shape and chemical gradient. Background technique [0002] The wettability gradient surface is a high-performance surface whose composition, structure, and wettability change continuously or stepwise with space. The surface tension is not equal, which leads to the tendency and ability of the liquid to flow automatically from the place of low surface energy to the place of high surface energy. Therefore, wettability gradient surfaces have been widely used in biocompatibility, diagnostics, nanotribology, microfluidics, liquid self-transportation, etc., especially in liquid droplet and microfluidic migration (flow) and enhanced gas phase droplet condensation. There are important applications in the heat transfer process and the heat dissipation performance of micro heat pipes. [0003] At present, the preparation methods of wett...

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Problems solved by technology

[0003] At present, the preparation methods of wetting gradient surfaces can be mainly divided into two types, that is, controlling the chemical composition of the surface and changing the microscopic morphology of the surface. There are many problems in the single-gradient wettability surface prepared by these two methods, and the performance needs to be improved. Such as the inability to achieve precise and directional wetting control

Therefore, it is very necessary to combine the chemical composition of the surface with the change of the surface microstructure to prepare a high-performance wettability gradient surface. However, there is no simple and effective preparation method on the market. In view of this situation, this paper Invention proposes a method for preparing wettability gradient surfaces combining corrugations and chemical gradients

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