Liquid injection type super smooth surface and laser precision micro-fabrication method thereof

Abstract

The invention relates to a liquid injection type super smooth surface and a laser precision micro-fabrication method thereof, and belongs to the technical field of functional materials. The liquid injection type super smooth surface takes a metal as a substrate; firstly, a micro-nano composite structure is prepared on the metal surface by means of laser etching; after that, a super-hydrophobic surface is obtained by baking, and then injected liquid covers the super-hydrophobic surface to obtain the liquid injection type super smooth surface. Test droplets include water droplets, acid solutions, alkali solutions, lake water, sea water, serum, glycerin and ketchup. The liquid injection type super smooth surface provided by the invention has very small frictional resistance, and can very easily slide off the surface and reduce the retention time and probability of the water droplets and other test liquid on the surface. The laser precision micro-fabrication method of the liquid injection type super smooth surface provided by the invention adopts the laser precision machining technology to prepare the micro-nano composite structure on the metal surface, the technological process is simple and easy to operate, no other chemical additives are needed, and there is no toxic side effect and pollution, so that the laser precision micro-fabrication method is suitable for large-scale and mass production.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a liquid-injected super-smooth surface and a laser precision micromachining method thereof. Background technique [0002] In 2011, the Aizenberg research group at Harvard University was inspired by the use of pitcher leaves to prey on insects by the smooth edge of pitcher leaves. For the first time, the concept of injecting slippery liquid into porous surfaces, also known as super slippery surfaces, was proposed. By preparing a loose and porous substrate and injecting lubricating oil, a super-slip surface covered by a dynamic oil film is obtained. Since the traditional solid-liquid interface is replaced by a liquid-liquid interface, the roughness of the contact surface is reduced to the molecular level, so the liquid droplet on the superslip surface can roll with a small rolling angle. This is similar to the super-hydrophobic surface that also has low rolling angle ...

AI Technical Summary

Problems solved by technology

This is similar to the super-hydrophobic surface that also has low rolling angle characteristics, but the defect of the super-hydrophobic surface is that liquids with low surface energy such as hexadecane and phenyl silicone oil will immerse the surface micro-nano structure when they contact the super-hydrophobic surface, while other The first defect is that when the droplet hits the surface with a certain kinetic energy, it may destroy the surface micro-nano structure, and it is also easier to immerse into the surface micro-nano structure, resulting in the failure of the super-hydrophobic state

In addition, low surface energy coatings or chemical groups are easy to degrade or stain after long-term use. For example, when bacteria come into contact with the surface, biomacromolecules such as proteins will be adsorbed on the surface to degrade the low surface energy, thus losing the super liquid repellency.

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