Preparing method of three-dimensional network super-hydrophobic surface

A superhydrophobic surface, three-dimensional network technology, applied in surface etching compositions, chemical instruments and methods, metal material coating processes, etc. and other problems, to achieve the effects of excellent superhydrophobicity, good long-term stability, and short experimental period.

Inactive Publication Date: 2016-04-06
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 limitations, such as complex preparation process, expensive raw materials and processing equipment, long preparation cycle, poor stability, etc., making it difficult to realize large-scale application of superhydrophobic surfaces in actual production.

Method used

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  • Preparing method of three-dimensional network super-hydrophobic surface
  • Preparing method of three-dimensional network super-hydrophobic surface
  • Preparing method of three-dimensional network super-hydrophobic surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Ⅰ. Cut out a 304 stainless steel sheet with a size of 30×20×0.2mm, put it in an ultrasonic cleaning machine and clean it with chloroform, acetone, absolute ethanol, and deionized water for 10 minutes. After cleaning, take it out and blow it dry with nitrogen ,stand-by.

[0034] Ⅱ. Use a capillary to measure about 0.15 μL of alkylchlorosilane (1H,1H,2H,2H-perfluorooctyltrichlorosilane, FOTMS) and add it to a hydrochloric acid solution with a concentration of 1mol / L to form a mixed solution, and place it side by side Stir well on a magnetic stirrer. At room temperature, the cleaned stainless steel sheet was etched in a mixed solution for 50 min. After etching, the steel sheet was taken out, rinsed with deionized water, and dried with nitrogen to obtain a stainless steel surface with superhydrophobic properties. At the same time, the The surface also has a certain oleophobicity (rapeseed oil, crude oil).

[0035] The reaction formula of the chemical reaction in the etchi...

Embodiment 2

[0039] Ⅰ. Cut out an aluminum 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.

[0040]Ⅱ. Use a capillary to take about 0.5 μL of alkylalkoxysilane (1H,1H,2H,2H-perfluorodecyltriethoxysilane) and add it to a sodium hydroxide solution with a concentration of 2mol / L to form a mixed solution , and placed on a magnetic stirrer to stir evenly. At room temperature, place the cleaned aluminum sheet in a mixed solution to etch for 30 minutes. After etching, take out the aluminum sheet, rinse it with deionized water, and dry it with nitrogen to obtain an aluminum surface with superhydrophobic properties. At the same time, the surface It also has certain oil repellency. The reaction formula of the chemical reaction in the etching process is:

[0041] 2Al+2NaOH+2H 2 O=2NaAlO 2 +3H...

Embodiment 3

[0043] 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.

[0044] II. Take 0.75 μL of fatty acid (perfluorodecanoic acid) and add it to potassium hydroxide solution with a concentration of 0.5 mol / L to make a mixed solution, and place it on a magnetic stirrer to stir evenly. At room temperature, place the cleaned silicon wafer in a mixed solution to etch for 60 minutes. After the etching is completed, take out the silicon wafer, rinse it with deionized water, and dry it with nitrogen to obtain a silicon surface with superhydrophobic properties. The surface also has a certain degree of oleophobicity.

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Abstract

The invention discloses a preparing method of a three-dimensional network super-hydrophobic surface. Chemical etching and surface modification are combined to be finished at one step. The preparing process of the super-hydrophobic surface comprises coarse structure preparation and surface modification. A substrate is arranged in an etchant-surface modification substance mixed solution, a coarse structure is constructed through substrate etching via the chemical or electrochemical reaction, and the surface modification is carried out through low-surface-energy substances to reduce the surface free energy. The size of the super-hydrophobic structure is controlled through reaction time, reaction temperature and concentration. The contact angle test shows that the contact angle of water drops on the surface of the super-hydrophobic structure reaches 175 degrees, and the rolling angle is smaller than 5 degrees. The electrochemical testing result shows that the corrosion resistance of super-hydrophobic stainless steel pieces is improved to about 16 times the corrosion resistance of ordinary stainless steel. The provided method is easy to operate, low in cost, good in stability, superior in super-hydrophobic performance, good in corrosion resistance, capable of facilitating industrialization and large-area popularization and capable of being applied to metal corrosion 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 three-dimensional network super-hydrophobic surface. Background technique [0002] Surface wettability is an important characteristic of solid surfaces, which is mainly determined by the surface chemical composition and surface microstructure. Generally, the wettability of a liquid on a solid surface is characterized by the contact angle, and the surface with a contact angle with water greater than 150° and a rolling angle less than 10° is usually called a superhydrophobic surface. Superhydrophobic surfaces are widely used in architectural glass, transportation, biomedicine and other fields due to their special wettability. Therefore, it is of great significance and broad application prospects to study the preparation of superhydrophobic surfaces. [0003] As a common engineering technology material, stainless steel is widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28C23F1/36C23F1/32C23C22/50C23C22/66
CPCC23F1/28C09K13/02C23C22/50C23C22/66C23F1/36
Inventor 高立国杨红静郝策马廷丽
Owner DALIAN UNIV OF TECH
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