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Copper base gradient contact angle functional surface and preparation method thereof

A contact angle and gradient technology, applied in the direction of metal material coating process, etc., can solve the problems of poor water resistance and heat resistance of gradient wetting surface, limited application of copper-based contact angle surface, complicated preparation method, etc. The preparation method is simple and easy to implement, and the effect of expanding the scope of application

Inactive Publication Date: 2012-11-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method is complicated and the required equipment is expensive, which limits the further application of copper-based contact angle surfaces
In addition, the water resistance and heat resistance of the gradient wetting surface are poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step is to place the copper sheet with a smooth surface in acetone, soak and clean it for 15 minutes to obtain a clean copper sheet;

[0028] In the second step, after mixing 10 grams of 1mol / L sodium hydroxide solution, 10 grams of 1mol / L ammonium persulfate solution and 15 grams of distilled water, the solution was stirred for 7 minutes at a speed of 15 rpm to obtain solution C;

[0029] The third step is to place the clean copper sheet obtained in the first step vertically in an open container, and gradually add solution C to the container to ensure that when the addition is completed in 30 minutes, the upper edge of the clean copper sheet is just completely covered by solution C. Infiltration to obtain a pre-functional surface;

[0030] In the fourth step, the pre-functional surface obtained in the third step was washed twice in distilled water, and then dried at 50°C. After drying, the preparation of the copper-based gradient contact angle functional surf...

Embodiment 2

[0032] The first step is to place the copper sheets with smooth and flat surfaces in acetone and ethanol respectively, soak and clean them for 10 minutes in turn, for a total of 20 minutes, to obtain clean copper sheets;

[0033] In the second step, the concentration is 5 grams of 0.1mol / L potassium hydroxide solution, 2 grams of 0.01mol / L sodium persulfate solution and 10 grams of distilled water are mixed, and stirred for 5 minutes at a speed of 10 rpm to obtain solution C;

[0034] The third step is to place the clean copper sheet obtained in the first step vertically in an open container, and gradually add solution C to the container to ensure that when the addition is completed in 10 minutes, the upper edge of the clean copper sheet is just completely covered by solution C. Infiltration to obtain a pre-functional surface;

[0035] In the fourth step, the pre-functional surface obtained in the third step is washed twice in distilled water, and then dried at 40°C. After dry...

Embodiment 3

[0037] In the first step, place the smooth and flat copper sheets in ethanol and distilled water respectively, soak and clean them for 12 minutes in turn, for a total of 24 minutes, to obtain clean copper sheets;

[0038] In the second step, after the concentration is 4 grams of 3mol / L potassium hydroxide solution and 9 grams of 5mol / L sodium bicarbonate solution, 3.5 grams of 4mol / L potassium persulfate solution and 27 grams of distilled water are mixed, and the mixture is mixed at 14 rpm. The rotation speed was stirred for 6 minutes to obtain solution C;

[0039] The third step is to place the clean copper sheet obtained in the first step vertically in an open container, and gradually add solution C to the container to ensure that when the addition is completed in 36 minutes, the upper edge of the clean copper sheet is just completely covered by solution C. Infiltration to obtain a pre-functional surface;

[0040] In the fourth step, the pre-functional surface obtained in t...

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Abstract

The invention discloses a copper base gradient contact angle functional surface and a preparation method thereof. The preparation method comprises the following steps of (1) placing a copper sheet in cleaning solution, and soaking and cleaning to obtain a clean copper sheet; (2) mixing and stirring 2-15 parts of alkaline solution A, 0-10 parts of oxidizing solution B and 10-30 parts of distilled water so as to obtain solution C; (3) vertically placing the clean copper sheet in an opened container, dripping the solution C in the container, guaranteeing that when dripping of the solution C is finished in 10-40 minutes, the upper edge of the copper sheet is completely wetted by the solution C exactly, and obtaining a pre-functional surface; and (4) placing the pre-functional surface in the distilled water, cleaning, and then drying so as to obtain the copper base gradient contact angle functional surface. The contact angle on a copper base can be continuously changed in a gradient manner within a range between 95 degrees (+ / -3 degrees) and 5 degrees (+ / -3 degrees). The preparation method is simple and practicable, and is low in cost, an obtained gradient wetted surface has good water resisting property and heat resisting property, and an application range of an engineering material, namely copper, is further expanded.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a preparation process for endowing a copper-based surface with the characteristic of continuous change in contact angle. Background technique [0002] Functionally graded material refers to a high-performance material in which the function of the material, such as composition, structure, and performance, changes continuously or stepwise with space or time. The contact angle is an important physical quantity used to measure the wettability of the surface of a material. Generally, the smaller the contact angle, the greater the surface energy. The gradient contact angle surface refers to the continuous change of the contact angle of the material surface along a certain direction of the surface. As a functional material, copper has shown broad application prospects in engineering fields such as heat transfer and electrical conduction. However, there are few reports on the prepar...

Claims

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Application Information

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IPC IPC(8): C23C22/63
Inventor 程江张勇皮丕辉文秀芳蔡智奇杨卓如
Owner SOUTH CHINA UNIV OF TECH
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