Wet gradient surface preparation method integrating waviness with chemical gradient

Abstract

The invention discloses a wet gradient surface preparation method integrating waviness with chemical gradient. The wet gradient surface preparation method comprises the following steps: step (1) preparing a coating solution of polydimethyl siloxane; step (2) performing coating solution spin-coating; step (3) preparing a flexible wavy structure; step (4) preparing shielding plate; and step (5) preparing a surface integrating chemical gradient with the flexible wavy structure. According to the preparation method disclosed by the invention, the flexible material is adopted, and the flexible material is utilized to generate the wavy structure in the stress directions at the two sides, so that motion barriers at the two sides of liquid drop are improved; and plasma treatment is utilized to obtain a chemical gradient micro structure surface, so that liquid drop spreads in single direction; and the side surfaces of the wavy structure are of trigonometric function types.

Description

technical field [0001] The invention belongs to the field of material surface modification, and in particular relates to a wettability gradient 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 pres...

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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 necessary to combine the chemical composition of the surface with the change of the surface microstructure to prepare a high-performance wettability gradient surface, but there is no simple and effective preparation method on the market.

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