A bionic water vapor condensation and collection structure and its preparation method

Abstract

The invention provides a bionic water vapor condensation and collection structure and a preparation method thereof. The structure is composed of a hydrophilic region and a hydrophobic region that are formed by specific shapes. The preparation method comprises the following steps: spin-coating of photoresist, etching of silicon oxide layers, preparation of the hydrophobic region, treatment of the hydrophilic region, preparation of condensate drainage channels and the like. According to the bionic water vapor condensation and collection structure and the preparation method thereof provided by the invention, the condensate can be directionally collected by using the surface tension of the material rather than the gravity when the size of the condensate is up to several hundred microns or even tens of microns; part of the condensation region is exposed by using the special hydrophilic and hydrophobic alternate structure, and thus the blocking effect of the condensate is very small; silicon nanowires are adopted as the structure of the hydrophobic region, so that the hydrophobic characteristics of the hydrophobic region can be maintained effectively for a long time; and a porous material is taken as the drainage channel, and thus the condensate in the condensate collecting region can be rapidly and effectively drained out of the condensation structure even when placed horizontally. The bionic water vapor condensation and collection structure and the preparation method thereof provided by the invention have the advantages of easy preparation, fast condensation speed and the like, and have broad application prospects.

Description

technical field [0001] The present invention belongs to the field of bionic micro-nano manufacturing, and specifically relates to a bionic water vapor condensation and collection structure and a preparation method thereof. This water vapor condensation and collection structure has excellent water vapor condensation characteristics, and can collect water droplets formed by condensation in a directional manner. Efficient water vapor condensation and collection structures provide a solution. Background technique [0002] During the condensation process, since the condensate is attached to the surface of the condensation structure, the heat exchange process between the moist air and the surface of the condensation structure is hindered. Therefore, in order to obtain a water vapor condensation and collection structure with excellent performance, the condensate formed by condensation must be quickly and effectively separated from the surface of the condensation structure. At pres...

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Problems solved by technology

[0005] The above two bionic water vapor condensation and collection structures have certain limitations. The cactus-like structure is a cone-shaped structure, while the condensation surface used in general industries is a planar structure, and the scale preparation of the cone-shaped structure is difficult; The surface structure of the beetle is finally detached from the surface of the condensation structure under the action of gravity. The condensate is already large enough (usually the size of the condensate reaches several millimeters), which has formed a certain hindrance to the condensation process. In order to make the condensate detach quickly, It is necessary to reduce the proportion of the hydrophilic area, but this also limits the performance of the water vapor condensation and collection structure

In addition, the methods used in the existing technologies to prepare hydrophobic regions generally use self-assembled hydrophobic molecular layers or coating hydrophobic coatings. The surface of the prepared hydrophobic region is prone to contamination, which will deteriorate the hydrophobic performance and reduce the surface condensation performance.

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