Preparation method of super-hydrophobic surface with directional transport function

Abstract

The invention discloses a preparation method of a super-hydrophobic surface with a directional transport function. The method comprises the following steps: step 1, spin coating a first layer of ultraviolet lithography positive photoresist for the first ultraviolet lithography; step 2, spin coating a second layer of ultraviolet lithography negative photoresist, and tilting a substrate for the second ultraviolet lithography; step 3, dip coating low surface energy nanoparticles; and step 4, evaporating a hydrophilic metal thin film in a vacuum mode, and generating a required directional transport track to obtain the super-hydrophobic surface with the directional transport function. According to the preparation method of the super-hydrophobic surface with the directional transport function provided by the invention, through twice ultraviolet lithography, the specific surface area of a microstructure is increased on one hand, so that the roughness after dip coating the low-surface energy nanoparticles is sufficient; and on the other hand, when the second lithography is performed, the substrate is intentionally inclined for exposure, so that a one-way inclined structure with a certain inclination angle is obtained, therefore a rolling direction is given in advance. The pre-given rolling direction is combined with a hydrophilic transportation track obtained through later evaporation,so that the directional transport of liquid drops is better realized.

Description

technical field [0001] The invention relates to the field of super-hydrophobic surface processing, in particular to a method for preparing a super-hydrophobic surface with directional transport function. Background technique [0002] The superhydrophobic surface is a kind of bionic functional surface inspired by the "lotus leaf effect". Usually, the contact angle of water droplets is greater than 150°, and the rolling angle is less than 10°. There are also nanostructures on the micro-papillary structure on the surface of the lotus leaf. This micro-nano composite structure has an important impact on superhydrophobicity. Roll down, so that the lotus leaf has good self-cleaning performance. [0003] Oriented transport of water droplets refers to the rolling of water droplets along a designed track on a superhydrophobic surface, which has great potential value in the field of droplet shunting. In the existing technology, a hydrophilic track is set on the superhydrophobic surfa...

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Problems solved by technology

[0007] 1. The chemical etching method is used to construct a rough micro-nano composite structure on the substrate. This structure can only be formed vertically on the substrate, and cannot form a unidirectional inclined structure with a certain inclination angle, and the generated microstructure morphology is also poor. unable to regulate

[0008] 2. The micro-nano composite structure constructed on the substrate by chemical etching method, the generated micro-scale structure and nano-scale structure cannot be adjusted, so the two structures cannot be effectively matched. Although the surface presents super hydrophobicity, the droplet is Surface does not roll well

[0009] 3. Use a knife to scratch a certain track on the super-hydrophobic surface according to the actual needs to realize the directional transport of the droplets. However, due to the uncontrollable force of the scraping, it will cause the scraped track to be in and out of the track of the required directional transport. The directional transport of droplets cannot be effectively realized, and the controllability is poor

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