Preparation method of graphene aerogel, Fe3O4/graphene aerogel and preparation method of Fe3O4/graphene aerogel

A graphene airgel and gel technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as low electrical conductivity and poor structural integrity

Active Publication Date: 2019-08-09
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene airgel produced by this method has more defects and po

Method used

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  • Preparation method of graphene aerogel, Fe3O4/graphene aerogel and preparation method of Fe3O4/graphene aerogel
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  • Preparation method of graphene aerogel, Fe3O4/graphene aerogel and preparation method of Fe3O4/graphene aerogel

Examples

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preparation example Construction

[0027] The preparation method of graphene airgel comprises the steps:

[0028] S10, preparing the silica porous framework:

[0029]S110, mixing the silicon source material and the phase separation inducer for acid hydrolysis to obtain a first hydrolyzate. In detail, silicon source material, acid, water (H 2 O) and the phase separation inducer are mixed sequentially according to the mass ratio of (6~10):(0.5~1.5):(8~12):(0.5~1), and the temperature is 0~15°C. Acid hydrolysis yields the first hydrolyzate.

[0030] Wherein, the silicon source material includes at least one of ethyl orthosilicate, methyl orthosilicate, methyltriethoxysilane and methyltrimethoxysilane, as long as it can be hydrolyzed to obtain silicon dioxide. The phase separation inducer includes polyethylene oxide, polyvinyl polypyrrolidone or polyacrylamide. Through the use of the phase separation inducer, the phase separation reaction of the homogeneous silicon-containing aqueous solution can occur under cer...

Embodiment 1

[0060] The preparation method of graphene airgel comprises the steps:

[0061] (1), tetraethyl orthosilicate (TEOS), nitric acid (HNO 3 ), water (H 2 O) and polyethylene oxide (PEO) were mixed sequentially according to a mass ratio of 8.5:1:10:0.8, and acid hydrolyzed at a temperature of 0° C. to obtain a first hydrolyzate. Wherein, the molecular weight of polyethylene oxide (PEO) is 10,000.

[0062] (2) Pour the first hydrolyzate into a plastic mold and place it in an incubator at 60° C. to fully react for at least three days to obtain a silica skeleton.

[0063] (3) After washing the silica skeleton to neutrality, add ammonia solution with a concentration of 1mol / L for aging treatment for at least 24 hours, then wash the sample to neutrality, and control the temperature of the incubator at 40°C. After drying for 25 hours, a three-dimensional silica porous framework was obtained.

[0064] (4) Place the silica porous framework in an environment with a temperature of 800° C...

Embodiment 2

[0068] The preparation method of the graphene airgel provided in Example 2 is basically the same as the preparation method of the graphene airgel provided in Example 1, except that the molecular weight of the polyethylene oxide (PEO) provided in Example 2 is 100,000.

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Abstract

The invention provides a preparation method of a graphene aerogel, a Fe3O4/graphene aerogel and a preparation method of the Fe3O4/graphene aerogel, and belongs to the technical field of graphene aerogels. The preparation method of the graphene aerogel comprises the steps that an annealed porous silicon dioxide framework is placed at 1,100-1,300 DEG C, through a chemical vapor deposition method, graphene grows, and pretreated gel is obtained. The porous silicon dioxide framework in the pretreated gel is removed to obtain the graphene aerogel. The preparation method of the Fe3O4/graphene aerogelcomprises the steps that the graphene aerogel and a dopamine solution are subjected to a hybrid reaction under the alkalescence condition to obtain a dopamine/graphene aerogel. Then through an alcohol-thermal reaction and calcining, the Fe3O4/graphene aerogel is obtained. The graphene aerogel prepared by the preparation method is specific in structure and high in conductive performance and has few defects, and therefore the obtained Fe3O4/graphene aerogel has better electromagnetic shielding performance.

Description

technical field [0001] The application relates to the technical field of graphene airgel, in particular, to a preparation method of graphene airgel, Fe 3 o 4 / Graphene airgel and preparation method thereof. Background technique [0002] At present, the preparation method of graphene airgel usually uses a metal three-dimensional framework (copper foam or nickel foam) as a catalyst, grows graphene in situ on the surface of the metal three-dimensional framework by chemical vapor deposition, and then removes the metal framework, and finally After drying, graphene airgel is obtained. However, due to the large pore size of the metal framework itself, and the relatively harsh preparation conditions of the framework itself, the graphene airgel obtained by this method has a large pore size and high preparation costs. Another method is to prepare graphene airgel by chemical reduction of graphene oxide dispersion. The graphene airgel prepared by this method has more defects and po...

Claims

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Application Information

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IPC IPC(8): C01B32/186C01B32/194
CPCC01B32/186C01B32/194
Inventor 梅园赖垂林刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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