Titanium alloy super hydrophobic-super hydrophilic surface and preparing method and application of titanium alloy super hydrophobic-super hydrophilic surface

Abstract

The invention discloses a titanium alloy super hydrophobic-super hydrophilic surface. Multiple sub arrays are distributed on the surface of a titanium alloy. Multiple super hydrophobic areas and multiple super hydrophilic areas in each sub array are arranged alternately in a wedge shape or a triangular shape, and super hydrophilic gathering areas are distributed between the sub arrays. The super hydrophobic surface has the good super hydrophobic performance, drop adhesion is very little, and rolling is extremely easy; drops can be adsorbed by the super hydrophilic areas, the drops at the top ends of the super hydrophilic areas in the wedge shape or the triangular shape can rapidly move towards the bottom of the wedge shape or the triangular shape under the drive of Plath pressure generatedby the wedge shape or the triangular shape, the super hydrophilic areas arranged alternately with the super hydrophilic areas can repel directional transportation of the drops, under the synergisticeffect of the super hydrophobic areas and the super hydrophilic areas, the condensation small drops can be gathered into the hydrophilic gathering area constantly, high-concentration-ratio self-driving water gathering is achieved, disengaging of the drops is accelerated, and therefore the condensation heat transfer efficiency is improved. The invention provides a preparing method and application of the titanium alloy super hydrophobic-super hydrophilic 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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