Production method of graphene foam/magnetic nanowire composite wave-absorbing material

A composite absorbing material, graphene foam technology, applied in chemical instruments and methods, other chemical processes and other directions, can solve the problems of poor absorbing performance, complex preparation methods, large specific surface area, etc., to achieve good toughness, good electricity The effect of chemical activity and good absorbing performance

Active Publication Date: 2019-09-24
TONGJI UNIV
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Problems solved by technology

Graphene is a new two-dimensional nanomaterial discovered for the first time in 2004. It has unique physical and chemical properties. Compared with traditional carbonaceous materials, graphene not only has a lower density and a larger specific surface area, but also has high electrical conductivity and thermal conductivity. These characteristics of stability enable graphene to replace traditional carbon materials and become a new type of wave-absorbing material. The main electromagnetic wave attenuation mechanism of simple graphene is electrical loss, so the wave-absorbing performance is not good, and the electromagnetic wave absorption of graphene materials is further improved. Performance is an open issue
[0003] Chinese patent CN107177053A discloses a nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structure wave-absorbing material and its preparation method. A hydrothermal reaction is carried out in solution A, and after the reaction, the silicon carbide fiber cloth is taken out for annealing treatment to obtain a nickel cobaltate-silicon carbide fiber multi-scale reinforcement; solution A is obtained by adding cobalt nitrate, nickel nitrate and urea into water and stirring evenly; The polyamic acid solution is evenly painted on the outer surface of the nickel cobaltate-silicon carbide fiber multi-scale reinforcement, and then stacked neatly to obtain the prefabricated part; the prefabricated part is subjected to repeated processes of vacuuming-pressure maintaining-pressure relief several times, Nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structure wave-absorbing material is obtained by molding, but the preparation method of this patent is relatively complicated, requiring multiple vacuum-holding-pressure-relieving processes

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  • Production method of graphene foam/magnetic nanowire composite wave-absorbing material

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[0028] A preparation method of a graphene foam / magnetic nanowire composite wave-absorbing material, the specific steps are as follows:

[0029] (1) Preparation of graphene oxide aqueous solution: Weigh 35ml, 2-5mg / ml graphene oxide in beaker A, weigh 10-100ml deionized water with a measuring cylinder, pour it into beaker A, stir while injecting, Transfer to 50ml centrifuge tube B after forming a uniform graphene aqueous solution;

[0030] (2) Preparation of graphene oxide ethanol solution: Weigh 30-100ml ethanol solution with a measuring cylinder, pour it into centrifuge tube B, shake well, put it into a centrifuge for centrifugation, the speed is 10000-12000r / min, and the time is 2-10min, pour out about 30-100ml supernatant after centrifugation, stir the residue and then add 30-100ml ethanol solution for centrifugation, repeat this operation 6 times, measure 35-65ml ethanol as the solvent for oxidation Graphene solution;

[0031] (3) Preparation of graphene oxide foam: put ...

Embodiment 1

[0036] This embodiment is a preparation method of graphene foam / nickel cobaltate nanowires with wave-absorbing properties, which is carried out in the following steps:

[0037] (1) Preparation of graphene oxide aqueous solution: Weigh 35ml, 2.5mg / ml graphene oxide in beaker A, weigh 10ml of deionized water, inject it into beaker A, stir while injecting, and form a uniform graphene aqueous solution Transfer to 50ml centrifuge tube B;

[0038] (2) Preparation of graphene oxide ethanol solution: Weigh 30ml of ethanol solution with a measuring cylinder, pour it into centrifuge tube B, shake well, put it in a centrifuge for centrifugation, the speed is 11000r / min, the time is 2min, and the centrifugation is over Finally pour out about 30ml supernatant, stir the residue and then add 30ml ethanol solution for centrifugation, repeat the operation 6 times like this, measure 35ml ethanol as the graphene oxide solution of solvent;

[0039] (3) Preparation of graphene oxide foam: 35ml of...

Embodiment 2

[0045] This embodiment is a preparation method of graphene foam / cobalt tetroxide nanowires with wave-absorbing properties, which is carried out in the following steps:

[0046] (1) Preparation of graphene oxide aqueous solution: Weigh 35ml, 2.5mg / ml graphene oxide in beaker A, weigh 10ml of deionized water, inject it into beaker A, stir while injecting, and form a uniform graphene aqueous solution Transfer to 50ml centrifuge tube B;

[0047] (2) Preparation of graphene oxide ethanol solution: Weigh 30ml of ethanol solution with a measuring cylinder, pour it into centrifuge tube B, shake well, put it in a centrifuge for centrifugation, the speed is 11000r / min, the time is 2min, and the centrifugation is over Finally pour out about 30ml supernatant, stir the residue and then add 30ml ethanol solution for centrifugation, repeat the operation 6 times like this, measure 35ml ethanol as the graphene oxide solution of solvent;

[0048] (3) Preparation of graphene oxide foam: 35ml of...

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Abstract

The invention relates to a production method of a graphene foam/magnetic nanowire composite wave-absorbing material. The production method of the graphene foam/magnetic nanowire composite wave-absorbing material comprises the following steps of producing a graphene oxide aqueous solution, conducting high-speed centrifugation for multiple times by using ethyl alcohol as a solvent to make sure that water is completed replaced, so as to obtain a graphene oxide solution with the low-concentration ethyl alcohol used as the solvent, carrying out a one-step hydrothermal reaction to produce three-dimensional porous graphene oxide foam, and then carrying out a secondary hydrothermal reaction to synthesize one-dimensional magnetic nanowires in a porous structure formed by two-dimensional graphene sheet layers, so as to form a rich structure which integrates multidimensional scaling. Electrical loss and magnetic loss of the graphene foam/magnetic nanowire composite wave-absorbing material are given play to, and an electromagnetic coupling effect, an interfacial effect, a nanometer effect and a quantum effect are used at the same time, so that excellent wave absorbing performance is obtained, wide-frequency high-strength absorption of electromagnetic waves is achieved, and the problems of electromagnetic interference, electromagnetic radiation and the like can be effectively solved.

Description

technical field [0001] The invention relates to a preparation method of a wave-absorbing material, in particular to a preparation method of a graphene foam / magnetic nanowire composite wave-absorbing material. Background technique [0002] Although traditional ferrite, ceramic-based wave absorbers and other materials have good electromagnetic properties, they cannot meet the needs of practical applications due to their high density, heavy mass, and limited wave-absorbing performance. Therefore, the development of new wave-absorbing materials with light weight, broadband and high strength can solve practical problems. Graphene is a new two-dimensional nanomaterial discovered for the first time in 2004. It has unique physical and chemical properties. Compared with traditional carbonaceous materials, graphene not only has a lower density and a larger specific surface area, but also has high electrical conductivity and thermal conductivity. These characteristics of stability ena...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 邱军国健欣
Owner TONGJI UNIV
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