Zinc alloy superhydrophobic-superhydrophilic surface as well as preparation method and application thereof

Abstract

The invention discloses a zinc alloy superhydrophobic-superhydrophilic surface. A plurality of sub-arrays are distributed on the surface of a zinc alloy; a plurality of superhydrophobic areas and a plurality of superhydrophilic areas in each of the sub-arrays can be alternately arranged in a wedge or triangular shape; and a superhydrophilic collecting area is distributed between every two sub-arrays. The superhydrophobic surface disclosed by the invention has the excellent superhydrophobic performance, the adhesiveness of liquid droplets is very small and the liquid droplets are extremely andeasily rolled off; however, the superhydrophilic areas can absorb the liquid droplets, the liquid droplets formed in the top ends of the wedged or triangular superhydrophilic areas are driven by Plathpressure produced by the wedge or triangular shape and can be automatically and quickly moved toward the bottom part of the wedge or triangular shape, the superhydrophobic areas which alternate withthe superhydrophilic areas reject oriented transportation of the liquid droplets; and due to a mutual coordination effect of the superhydrophobic areas and the superhydrophilic areas, small condensedliquid droplets are continuously collected to a hydrophilic collecting area, so that self-driven water collection with the high concentration ratio can be realized, and dropping of the liquid dropletsis quickened, and thus, the condensation and heat transfer efficiency can be accelerated. The invention provides a preparation method and application of the zinc alloy superhydrophobic-superhydrophilic surface.

Description

technical field [0001] The invention relates to the technical field of surface modification of metal substrates, in particular to a superhydrophobic-superhydrophilic surface and its preparation method and application. Background technique [0002] In many important applications, such as heat transfer, seawater desalination, water harvesting, etc., the condensation of water vapor is a very important process. On a solid surface, the condensation process includes droplet condensation and film condensation, and the condensation method depends on the wettability of the condensation surface. Droplet condensation can greatly improve the efficiency of heat transfer. Studies have shown that compared with film condensation, the heat transfer efficiency of droplet condensation can be increased by more than 10 times. [0003] Condensing equipment is a device used to promote condensation, which mainly uses the principle of heat exchange to cool and condense steam into liquid. More comm...

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Problems solved by technology

For example: Patent CN200910221165 discloses a method for preparing a titanium or titanium alloy superamphiphobic surface anti-corrosion and anti-scratch material. Low surface energy modification, so as to make a super-hydrophobic surface, but this method uses volatile, irritating and toxic chemical reagents at room temperature, which does not meet the requirements of green environmental protection; patent CN201410788477 discloses a super-hydrophobic surface of titanium alloy The preparation method of the micro-nano structure, after ultrasonic cleaning the titanium alloy sample with acetone and absolute alcohol respectively, obtains a titanium alloy sample with a clean surface, and performs femtosecond laser lithography processing on the surface of the titanium alloy sample with a clean surface, and obtains in one step Titanium alloy samples with a superhydrophobic micro-nano structure surface, but this method is not suitable for large-scale application, the femtosecond laser processing efficiency is low, and the equipment cost is expensive; Patent CN201510281693 discloses a method for preparing titanium alloy superhydrophobic by using ultrashort pulse laser The anti-frost surface method uses an ultra-short pulse laser to adjust the relevant process parameters and then performs surface treatment on the sample. Numerous microstructures are processed on the surface of the sample. After the processing is completed, the processed sample is placed in an electric drying oven. Baking to obtain a titanium alloy super-hydrophobic frost-resistant surface, the preparation method is suitable for industrial production, and will not pollute the environment

However, the super-hydrophobic surface prepared by the above methods can only prevent the condensation of droplets on the surface, but cannot make the condensed droplets leave the surface quickly, which has very limited improvement in the condensation efficiency of condensation equipment.

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