Preparation method for porous aluminium oxide bionic multilayer dewatering surface

Abstract

The invention relates to preparation of a porous aluminium oxide bionic multilayer dewatering surface, belonging to the field of thin films. The invention aims to solve the technical problems that the current process for preparing a porous aluminium oxide dewatering thin film is relatively complex; the cost is high; and the range of a thin film substrate is limited by the preparation method of chemical etching, so that a preparation method for the porous aluminium oxide bionic multilayer dewatering surface is provided. According to the method, a degreased and processed aluminium sheet is subjected to electropolishing, and then is subjected to oxidation for twice; a prepared aluminium oxide film is soaked; a reducing agent is added; an aired aluminium / argentum oxide multilayer film is soaked in an ethanol solution of perfluorodecanethiol; and then the film is taken out and blow-dried by nitrogen so as to obtain the porous aluminium oxide bionic multilayer dewatering surface. The method is simple in process and low in cost; the prepared porous aluminium oxide dewatering thin film has good heat resistance, chemical stability and high mechanical strength and dimensional stability, and can be widely promoted for use.

Description

technical field [0001] The invention relates to a method for preparing a porous alumina biomimetic multilayer hydrophobic surface, belonging to the field of hydrophobic materials. Background technique [0002] With the continuous improvement of people's requirements for material properties, the research on materials with hydrophobic properties has become a new hot spot in recent years. Hydrophobic transparent coating materials have low surface free energy, so they have many unique surface properties, such as self-cleaning, anti-fouling, hydrophobic and oleophobic, etc., and are widely used in many fields such as national defense, industrial and agricultural production, and daily life. And important research and application value. Using such materials on the glass surface to make self-cleaning glass can be used as windshields for automobiles, airplanes, spacecraft, etc., which can not only reduce the pollution of pollutants such as dust in the air, but also make it suitable ...

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide a porous alumina biomimetic multi-layer hydrophobic surface in view of the disadvantages of poor hydrophobic performance of the current porous alumina surface material, irregular pore size, and relatively complicated surface modification process and high cost. The preparation method of the method is to electropolish the treated aluminum sheet after degreasing, and then oxidize twice, soak the prepared aluminum oxide film, add a reducing agent, and soak the dried aluminum oxide / silver multilayer film In the ethanol solution of perfluorododecanemercaptan, take it out and blow it dry with nitrogen to obtain a porous alumina biomimetic multilayer hydrophobic surface. The method is simple in process and low in cost, and the prepared porous alumina hydrophobic film has excellent Hydrophobic performance, the film pore shape is regular, the pore size is large and uniform, and the distribution is even