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Method for preparing super-hydrophobicity surface on metallic zinc

A super-hydrophobic, metallic zinc technology, applied in the coating process of metal materials, etc., can solve problems such as complex process, special processing equipment, and harsh preparation conditions

Inactive Publication Date: 2015-06-03
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on wettability mainly focuses on the preparation of superhydrophobic surface, and its preparation methods are various, such as: sol-gel method, laser etching method, electro-spin method, electrochemical deposition, chemical vapor deposition, plasma etching , layer-by-layer self-assembly deposition, etc., but most of them have disadvantages such as harsh preparation conditions, special processing equipment or complicated process, so it is still a challenging task to explore methods for preparing superhydrophobic surfaces with low cost, simple process and excellent performance. research topic

Method used

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  • Method for preparing super-hydrophobicity surface on metallic zinc
  • Method for preparing super-hydrophobicity surface on metallic zinc
  • Method for preparing super-hydrophobicity surface on metallic zinc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1. Influence of reaction time with silver nitrate solution on the wetting behavior of superhydrophobic surface

[0038] Mix the cleaned zinc flakes with 0.01mol·L -1 AgNO 3 The aqueous solution was reacted, annealed in an oven at 200°C for 1 hour, and the reaction times were 5min, 10min, 15min, 20min, 25min, and 30min. From Figure 5 The relationship curve between surface wettability and reaction time of the samples shown shows that when the reaction time is 20 minutes, the hydrophobicity of the zinc-based surface is the best, and the CA reaches 164°. When the reaction time is less than 15min, the zinc-based surface has not yet fully bonded with AgNO 3 The aqueous solution reacts so that there are not enough Ag nanolayers on the surface to build a suitable rough structure; after the reaction time is longer than 20min, the zinc-based surface is excessively mixed with AgNO 3 The aqueous solution reacts so that the zinc-based surface is completely covered by...

Embodiment 2

[0039] Embodiment 2. The influence of silver nitrate solution concentration on the wetting behavior of superhydrophobic surface

[0040] The cleaned zinc flakes were mixed with AgNO 3 The aqueous solution was reacted for 30 minutes, annealed in an oven at 200°C for 1 hour, and the concentration was 0.0005mol L -1 , 0.001mol·L -1 , 0.002mol·L -1 , 0.005mol·L -1 , 0.01mol·L -1 , 0.02mol·L -1 . Such as Figure 6 Surface wettability of the samples shown versus AgNO 3 The relationship diagram of aqueous solution concentration (curve (A) represents after annealing; curve (B) represents before annealing) shows that before annealing, the CA of the unreacted zinc base is 69°, and after 30 minutes of reaction, the CA of the zinc base surface decreases, maintaining around 35°, and without AgNO 3 changes in the concentration of the aqueous solution. After annealing, the wettability of the zinc-based surface increased dramatically. The CA of the unreacted zinc-based surface was 1...

Embodiment 3

[0041] Example 3. Effect of annealing tool on the wetting behavior of superhydrophobic surfaces

[0042] Mix the cleaned zinc flakes with 0.01mol·L -1 AgNO 3The aqueous solution was reacted for 30 minutes. In an oven, when the temperature was 200°C and the time was 1 hour, the CA of the zinc-based surface was above 150°.

[0043] Mix the cleaned zinc flakes with 0.01mol·L -1 AgNO 3 The aqueous solution was reacted for 30 minutes, and annealed in an oven at 200°C for 1 hour. The methods were as follows: directly put the zinc sheet on the petri dish, 1) without filter paper and cover; 2) add filter paper under the zinc sheet without a cover; 3) add Cover with filter paper; 4) add filter paper above and below the zinc sheet without covering; 5) add filter paper above and below the zinc sheet and cover.

[0044] Experimental results: 1) The zinc base without filter paper and cover has no hydrophobicity on the upper and lower surfaces; 2) The CA of the lower surface of the zinc...

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Abstract

The invention relates to a method for preparing a super-hydrophobicity surface on metallic zinc. The method is characterized by reacting metallic zinc with silver nitrate and then drying and annealing the reactant, thus preparing a metallic zinc surface with super-hydrophobicity. The prepared metallic zinc surface has better uniformly distributed porous structures and has excellent super-hydrophobicity. At room temperature, the contact angle of the metallic zinc surface and water is more than 150 degrees. The method has the characteristics of surface stability, simple equipment, convenience in operation, large-area preparation and the like. The obtained super-hydrophobicity surface is unnecessary to be modified by any organic substance, so the method is environment-friendly.

Description

Technical field: [0001] The invention relates to the field of material surface treatment, in particular to a method for preparing a superhydrophobic surface on the surface of metal zinc. Background technique: [0002] Surface wetting is one of the important characteristics of solid surfaces, and it is also the most common type of interface phenomenon. It not only directly affects various life activities of animals and plants in nature, but also plays an important role in human daily life and industrial and agricultural production. role. In recent years, due to the application of superhydrophobic surfaces in self-cleaning surfaces, microfluidic systems, and waterproof and anti-corrosion, composite materials with micro-nano structures with special wettability have attracted scientific attention due to their application prospects in people's daily life and industrial production. widespread attention in the world. The wettability of the surface is mainly determined by the chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C22F1/16C23C22/68
Inventor 卢士香杨小婵崔海龙徐文国段雅琼
Owner BEIJING INSTITUTE OF TECHNOLOGYGY