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Preparation method of in-situ fluorination modified super-amphiphobic flexible SiO2 aerogel

An aerogel and superamphiphobic technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of limiting the application range of superamphiphobic materials and the amphiphobic properties staying on the surface of materials

Active Publication Date: 2021-12-24
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of amphiphobic materials generally adopts the method of chemical vapor deposition or modification after impregnation, and most of the amphiphobic properties can only stay on the surface of the material, which greatly limits the application range of super amphiphobic materials.

Method used

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  • Preparation method of in-situ fluorination modified super-amphiphobic flexible SiO2 aerogel
  • Preparation method of in-situ fluorination modified super-amphiphobic flexible SiO2 aerogel
  • Preparation method of in-situ fluorination modified super-amphiphobic flexible SiO2 aerogel

Examples

Experimental program
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Effect test

example 1

[0027] First, mix 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane and methyltrimethoxysilane in a molar ratio of 1:1 to form a silicone solution, then add methanol and deionized water to control the organic silicon solution. The molar ratio of silicon solution, methanol, and deionized water is 1:10:8, and stirred for 10 minutes to obtain SiO 2 Sol solution, then add oxalic acid solution, control the pH value of the solution to 2, stir for 30min, then add tetramethylammonium hydroxide, the concentration of tetramethylammonium hydroxide in the mixed solution is 0.01mol / L, under the condition of 40℃ water bath Stir for 10 min. Pour the sol solution into the abrasive tool, seal the film, and place it in a vacuum oven at 50°C for 30 minutes to obtain SiO 2 wet gel. Take it out, place it at room temperature, add isopropanol to the mold of the wet gel to perform solvent replacement on the composite wet gel, replace the aging solution every 12 hours, and replace it 3 times in total to...

example 2

[0029] First, mix 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane and methyltrimethoxysilane in a molar ratio of 1:0.1 to form a silicone solution, then add ethanol and deionized water to control Silicone solution, ethanol, and deionized water in a molar ratio of 1:1:1, and stirred for 20 minutes to obtain SiO 2 Sol solution, then add hydrochloric acid solution, control the pH value of the solution to 3, stir for 40 minutes, then add ammonium hydroxide, the concentration of ammonium hydroxide in the mixed solution is 0.1mol / L, stir for 30 minutes in a water bath at 50°C. Pour the sol solution into the mold, seal the film, and place it in a vacuum oven at 60°C for 30 minutes to obtain SiO 2 wet gel. Take it out, place it at room temperature, add ethanol to the mold of the wet gel to perform solvent replacement on the composite wet gel, replace the aging solution every 12 hours, and replace it 5 times in total to obtain a silica gel. The resulting gel samples were subjected to CO...

example 3

[0031] First, mix 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane and methyltriethoxysilane in a molar ratio of 1:10 to form a silicone solution, then add isopropanol, deionized Water, control the molar ratio of organic silicon solution, isopropanol, and deionized water at 1:20:10, stir for 20 minutes, and obtain SiO 2 Sol solution, then add hydrofluoric acid solution, control the pH of the solution to 2, stir for 60 minutes, then add ammonium fluoride solution, the concentration of ammonium fluoride in the mixed solution is 0.1mol / L, and stir for 20 minutes in a 60°C water bath. Pour the sol solution into the mold, seal the film, and place it in a vacuum oven at 60°C for 30 minutes to obtain SiO 2 wet gel. Take it out, place it at room temperature, add isopropanol to the mold of the wet gel to perform solvent replacement on the composite wet gel, replace the aging solution every 24 hours, and replace it 5 times in total to obtain a silica gel. The resulting gel samples were su...

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Abstract

The invention relates to a preparation method of in-situ fluorination modified super-amphiphobic flexible SiO2 aerogel, which comprises the following steps: taking fluorosilane and organosilane as silicon sources, taking an alcohol solvent and deionized water as solvents, combining with an acid-base two-step catalysis method, mixing according to a certain ratio, and through in-situ fluorination modification, sol-gel, solvent replacement, aging and other methods, drying a sample through a CO2 supercritical drying method, and finally obtaining the in-situ fluorination modified super-amphiphobic flexible SiO2 aerogel material. By adopting an in-situ modification method, fluorosilane with a fluorocarbon chain and organosilane with a methyl group are mixed to serve as a silicon source, Si-O-Si bonding is performed through a hydrolytic polycondensation reaction, and the prepared silicon dioxide aerogel material has excellent super-amphiphobic performance on the surface and in the interior, has good flexibility, can be cut, and has a profound research value and a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials with characteristics of superhydrophobic and oleophobic, heat insulation and high specific surface area, and relates to a preparation method of in-situ fluorinated modified superamphiphobic flexible SiO2 airgel. Background technique [0002] The extreme hydrophobic properties of the material surface are inspired by natural organisms such as lotus leaves and butterfly wings, this wettability comes from the interaction of surface topography and low-energy surface coatings, manifested as high water contact angle and low sliding It has a wide range of applications in self-cleaning, anti-icing, etc. Airgel is a new type of material that uses gas as a dispersion medium and has a continuous three-dimensional nanoporous network structure. It has a low density (0.003-0.5g / cm 3 ), high porosity (80%~99.8%), low thermal conductivity (~0.02W / (m K)), large specific surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01B33/159
CPCC01B33/1585C01B33/159C01P2006/12C01P2004/03
Inventor 张君君刘一鸣仲亚
Owner NANJING UNIV OF TECH
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