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Preparing method for zinc-based super-hydrophobic surface with condensate liquid drop self-bounce character

A super-hydrophobic surface and condensate technology, applied to special surfaces, methods of granulating raw materials, pre-treated surfaces, etc., to achieve enhanced condensation heat transfer and simple and easy operation

Inactive Publication Date: 2018-12-07
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many reports on the preparation of superhydrophobic surfaces on zinc surfaces (such as CN103157590A, CN104846376A), but there are few reports on the direct preparation of superhydrophobic surfaces with self-bounce properties on zinc surfaces.

Method used

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  • Preparing method for zinc-based super-hydrophobic surface with condensate liquid drop self-bounce character
  • Preparing method for zinc-based super-hydrophobic surface with condensate liquid drop self-bounce character

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Clean the surface of the zinc sample with ethanol and deionized water in sequence, and dry it with nitrogen gas for later use.

[0020] (2) Soak the above-mentioned cleaned zinc sample in a low-temperature mixed solution with excess 0.5M zinc nitrate and 4.0M potassium hydroxide (the molar ratio of zinc nitrate and potassium hydroxide is 1:8) , deposited for 4 hours.

[0021] (3) Immerse the deposited zinc sample in an excess ethanol solution containing 1vol.% 1H,1H,2H,2H-perfluorodecyltriethoxysilane for 5 minutes, take it out and place it in an open environment at 120°C Heat treatment for 10 minutes.

[0022] After treatment, the water drop contact angle photos on the surface of the obtained zinc sample are shown in figure 1 , the surface of the zinc sample exhibits superhydrophobic properties, with a contact angle of 169°. The merged condensate droplets will disappear from the superhydrophobic surface, demonstrating the occurrence of self-bouncing behavior, th...

Embodiment 2

[0024] (1) Clean the surface of the zinc sample with ethanol and deionized water in sequence, and dry it with nitrogen gas for later use.

[0025] (2) Soak the above-mentioned cleaned zinc sample in a low-temperature mixed solution with excess 0.5M zinc nitrate and 4.0M potassium hydroxide (the molar ratio of zinc nitrate and potassium hydroxide is 1:8) , deposited for 6 hours.

[0026] (3) Immerse the deposited zinc sample in an excess ethanol solution containing 1vol.% 1H,1H,2H,2H-perfluorodecyltriethoxysilane for 5 minutes, take it out and place it in an open environment at 120°C Heat treatment for 10 minutes.

[0027] After treatment, the surface of the obtained zinc sample exhibits superhydrophobic properties. The merged condensate droplets do not disappear from the superhydrophobic surface and remain on the superhydrophobic surface, proving that self-bouncing behavior does not occur.

[0028] The 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane can also be composed of tri...

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Abstract

The invention relates to super-hydrophobic surface preparing, in particular to a preparing method for a zinc-based super-hydrophobic surface with the condensate liquid drop self-bounce character. A cleaned zinc sample is immersed in excessive low-temperature mixed liquid containing zinc salt and strong alkali to be deposited, after being taken out, the zinc sample is immersed in an excessive ethanol solution containing perfluor silane, heating treatment is conducted after the zinc sample is taken out again, and the super-hydrophobic surface with the condensate liquid drop self-bounce charactercan be obtained on the zinc sample after cooling. According to the preparing method, operation is simple and easy to implement, expensive equipment is not needed, and adopted reagents are free of environmental harm. The prepared super-hydrophobic surface can be expected to be applied to the fields of metal corrosion resisting, frost prevention, ice resisting, condensation heat transfer strengthening, self-cleaning and the like.

Description

technical field [0001] The invention relates to the preparation of a super-hydrophobic surface, in particular to a method for preparing a zinc-based super-hydrophobic surface with self-bounce characteristics of condensed liquid droplets. Background technique [0002] Wetting performance is an important feature of solid surfaces. It is generally believed that the contact angle of water on a solid surface is greater than 150°, and the surface is in a superhydrophobic state. The surface of the lotus leaf in nature is a typical example of superhydrophobicity. On the surface of the lotus leaf, water droplets can roll freely, and when rolling, they can take away pollutants such as dust attached to the surface, so that the surface can be kept clean. However, the detachment of droplets from superhydrophobic surfaces requires external forces such as wind and gravity. In practice, it has been found that on some superhydrophobic surfaces, the droplets caused by condensation can detac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/08B05D3/10B01J2/30C23C22/60
CPCB01J2/30B05D3/102B05D5/08B05D2518/10C23C22/60
Inventor 王鹏张盾陈勇李天平
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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