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Method for preparing super-hydrophobicity membrane on silicon face

A super-hydrophobic, thin-film technology, which can be used in devices for coating liquids on surfaces, special surfaces, pre-treated surfaces, etc., can solve the problems of complex super-hydrophobic surface processes, high energy consumption in the preparation process, and unfavorable promotion and application. Achieve good industrial application prospects, stable superhydrophobicity, and good environmental friendliness.

Inactive Publication Date: 2008-06-04
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above patents that the prepared superhydrophobic surface process is relatively complicated, and pollutants are discharged during the preparation process, which may cause environmental pollution, and the energy consumption of the preparation process is relatively high.
Chinese patent (CN1397668A) prepared polymer nanofibers with superhydrophobic surface by template extrusion method, but we found that the template used in this method is fragile and relatively expensive, which greatly limits its application in industrial production
The advantage of this method is that we can get the patterned surface we designed and the roughness we need. Its disadvantage is that it has high requirements for equipment, which is not conducive to its promotion and application in industrial production.

Method used

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  • Method for preparing super-hydrophobicity membrane on silicon face
  • Method for preparing super-hydrophobicity membrane on silicon face

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 3ml 30% NH 4 The OH solution was added dropwise to 50ml of ethanol, stirred at 60°C and kept for 30min, and then 3ml of ethyl orthosilicate was added dropwise to it, and stirring was continued for 90min at 60°C to ensure the formation of a sol. Then put the silicon wafer into a Piranha solution of concentrated sulfuric acid / hydrogen peroxide with a volume ratio of 7:3, take it out after keeping it at 90°C for 30 minutes, and then ultrasonically clean it with double distilled water, and finally dry it with nitrogen. After that, put the processed silicon wafer into the configured sol by pulling method at a pulling speed of 14cm / min. After pulling, let it dry naturally in the air for 5 minutes, and then dry it in an atmosphere of 210℃ , Ensure that the residual solvent in the film evaporates completely. Finally, it was immersed in a 0.1 mol / l perfluorooctyl trichlorosilane solution in n-hexane, and after 6 h, it was taken out to obtain a super-hydrophobic surface. The cont...

Embodiment 2

[0027] According to the operation method and steps of Example 1, the ethyl orthosilicate was changed to 6ml, and the rest of the steps were the same, and the superhydrophobic surface could also be obtained. The contact angle of the water droplets is 154±1.6°, and the rolling angle is about 8°.

Embodiment 3

[0029] According to the operation method and steps of Example 1, the n-hexane solution of perfluorooctyltrichlorosilane was changed to 0.2mol / l, and the rest of the steps were the same, and the superhydrophobic surface could also be obtained. The contact angle of the water droplets is 155±1.6°, and the rolling angle is about 6°.

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Abstract

The invention discloses a method that a film with ultra-hydrophobic property is prepared on silicon surface. The method prepares a dual-layer structure that micron structure and nanostructure coexist in surface microstructure by adopting a sol-gel method, and chemically modifies the surface through fluoric organics in order to form a contact angle of more than 150 DEG between the surface and the water and a sliding angle of less than 10 DEG that water drop slides on the surface, thus having good ultra-hydrophobic property. The invention provides a new preparation method for the applicable expansion of silicon material in industrial production. The invention has the advantages of simple operation, low requirements to equipment, scale production and having excellent industrial application prospect.

Description

Technical field [0001] The invention relates to a method for preparing a super-hydrophobic film on a silicon surface. Background technique [0002] Wetting ability is a very important feature of solid surface, usually the roughness and surface energy of solid surface determine its wetting ability. Super-hydrophobicity is one of the main manifestations of wetting ability, which means that the static contact angle between the water droplet and its surface is greater than 150°, and it also exhibits a smaller rolling angle. With the rapid development of nanotechnology in the past ten years, the study of superhydrophobicity has also become a hot spot, and people have done a lot of research work on the construction of superhydrophobicity. For example, a Chinese patent (application number 02121553) discloses a method for preparing carbon nanofibers, and particularly relates to a nanofiber with superhydrophobic, superphobic and superhydrophobic surfaces at the same time. The preparation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D3/02C09D1/00C09D5/16
Inventor 刘维民郭志光
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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