Preparation method for super-hydrophobic surface with bionic micro-nano composite structure

A technology of micro-nano composite structure and super-hydrophobic surface, which is applied to the device for coating liquid on the surface, special surface, pre-treated surface, etc., can solve the problems of expensive raw materials and processing equipment, complicated preparation process, poor stability, etc., and achieve Low cost, good repeatability, and improved corrosion resistance

Inactive Publication Date: 2016-03-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have their own shortcomings and limitations, such as complex preparation process, expensive raw materials and processing equipment, long cycle time, poor stability, etc.

Method used

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  • Preparation method for super-hydrophobic surface with bionic micro-nano composite structure
  • Preparation method for super-hydrophobic surface with bionic micro-nano composite structure
  • Preparation method for super-hydrophobic surface with bionic micro-nano composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Ⅰ. Cut out a 304 stainless steel sheet with a size of 30×20×0.2mm, put it in an ultrasonic cleaning machine and use chloroform, acetone, absolute ethanol and deionized water to ultrasonically clean it for 10 minutes, after cleaning, take it out and blow it dry with nitrogen ,stand-by.

[0035] Ⅱ. Weigh 8.0g FeCl on electronic analytical balance 3 Put it in a beaker, use a graduated cylinder to measure 30mL of deionized water and add it to the beaker. After the ferric chloride is completely dissolved, add 2mL of HCl, 2mL of H 3 PO 4 , 2mLH 2 o 2 , stir evenly with a glass rod, and prepare a ferric chloride etching solution with a concentration of 0.22g / mL. The cleaned stainless steel sheet was first immersed in FeCl at room temperature 3 Etched in the etching solution for 4 minutes, then immersed in 1mol / L HCl solution and etched for 20 minutes. After the etching is completed, the stainless steel sheet is ultrasonically cleaned with deionized water for 5 min, taken...

Embodiment 2

[0041] Ⅰ. Cut out a silicon wafer with a size of 30×20×0.2mm, place it in an ultrasonic cleaning machine and use chloroform, acetone, absolute ethanol and deionized water to ultrasonically clean it for 10 minutes. After cleaning, take it out and blow it dry with nitrogen. stand-by.

[0042] II. At room temperature, firstly immerse the cleaned silicon wafer in 0.5g / mL KOH etching solution for 10min and then immerse in 2mol / LHF solution for 5min. After the etching is completed, the silicon wafer is ultrasonically cleaned with deionized water for 5 min, taken out and blown dry with nitrogen gas.

[0043] Ⅲ. Place the beaker on an electronic analytical balance, accurately weigh 30g of absolute ethanol, and slowly add 1.5g of fatty acid (perfluorooctanoic acid, CF 3 (CF 2 ) 6 COOH), made into a 5% perfluorooctanoic acid-ethanol solution. After the prepared solution was placed on a magnetic stirrer and stirred for 3 h, a uniform and transparent liquid was formed. Immerse the et...

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Abstract

The invention belongs to the technical field of preparation of super-hydrophobic surfaces, and relates to a preparation method for a super-hydrophobic surface with a bionic micro-nano composite structure. From the angle of the super-hydrophobic surface, the super-hydrophobic surface is prepared by virtue of a mesoscale two-step etching method; etching treatment is carried out on a substrate surface twice; a micro-nano composite structure similar to a lotus leaf surface is constructed by utilizing a chemical or an electrochemical reaction etching substrate, and surface modification is carried out by virtue of a surface modifier to reduce surface free energy. The size of the micro-nano structure can be controlled by virtue of reaction time, a reaction temperature and concentration. A contact angle, on the surface of the micro-nano composite structure, of water drops is as high as 170 degrees while a rolling angle of the water drops is smaller than 5 degrees. According to electrochemical test results, corrosion resistance of a super-hydrophobic stainless steel sheet is 22 times that of common stainless steel. The method provided by the invention does not need special equipment, is low in cost, good in stability, excellent in super-hydrophobic property, good in corrosion resistance and can be applied to metal corrosion-resistant protection.

Description

technical field [0001] The invention belongs to the technical field of super-hydrophobic surface preparation, and relates to a method for preparing a bionic micro-nano composite structure super-hydrophobic surface. Background technique [0002] The wetting of liquid to solid surface is a common interface phenomenon, and wettability is an important property of solid surface. It is not only closely related to the life activities of various animals and plants in nature, but also widely used in industrial and agricultural production and people's daily life, such as waterproofing, oil recovery, paint coating, etc. There are many factors that affect the wettability of solid surfaces, among which surface free energy and surface microstructure are two key factors that determine the wettability of liquids on solid surfaces [Jiang Lei, Feng Lin. Bionic Intelligent Nano-interface Materials. Beijing: Chemical Industry Press, 2007.]. Many plants and animals in nature have superhydropho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/08B05D3/10
CPCB05D5/08B05D3/104B05D2401/20
Inventor 高立国杨红静杨树章马廷丽郝策
Owner DALIAN UNIV OF TECH
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