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A preparation method of graphene-enhanced biomass porous carbon electromagnetic wave-absorbing material

A technology of electromagnetic wave absorption and porous carbon, which is applied in the preparation/purification of carbon, chemical instruments and methods, and other chemical processes. The effect of improved performance, good electromagnetic wave absorption performance, good electromagnetic performance

Active Publication Date: 2021-01-08
SHENZHEN STRONG ADVANCED MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current porous carbon electromagnetic absorbing materials have poor microstructure design, narrow electromagnetic absorbing efficiency and effective absorbing frequency band, and the rigidity of porous carbon is not enough, the electromagnetic absorbing efficiency is not high, and the Durability and other issues
In addition, the poor macroscopic mechanical properties of porous carbon electromagnetic absorbing materials in the prior art make it difficult to design their macroscopic morphology, and it is difficult to obtain electromagnetic absorbing materials with a macroscopic three-dimensional structure

Method used

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  • A preparation method of graphene-enhanced biomass porous carbon electromagnetic wave-absorbing material
  • A preparation method of graphene-enhanced biomass porous carbon electromagnetic wave-absorbing material
  • A preparation method of graphene-enhanced biomass porous carbon electromagnetic wave-absorbing material

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Embodiment 1

[0051] A graphene-enhanced biomass porous carbon electromagnetic wave-absorbing material, which is prepared according to the following steps:

[0052] Step 1, pretreatment of egg white:

[0053] Use physical dispersion to pretreat the egg white to obtain a uniform protein solution. The specific steps are as follows: separate the fresh egg white from the egg, and use an ultrasonic cell pulverizer to ultrasonically pulverize it to obtain a uniform protein (as the main component) solution. Wherein: the mass fraction of protein in the protein solution is 10wt% (the mass fraction of protein in the protein solution obtained by different eggs will be different); the power of ultrasonic pulverization is 15% of the power of ultrasonic cell pulverizer, pulverization time 2min;

[0054] Step 2, preparation of graphene oxide slurry:

[0055] Graphene oxide powder is dissolved in deionized water to obtain graphene oxide slurry, wherein: the concentration of the graphene oxide slurry is 1...

Embodiment 2

[0066] In this embodiment, the graphene-enhanced biomass porous carbon electromagnetic absorbing material is realized in the following steps:

[0067] Step 1, pretreatment of egg white:

[0068] Use physical dispersion to pretreat the egg white to obtain a uniform protein solution. The specific steps are as follows: separate the fresh egg white from the egg, and use an ultrasonic cell pulverizer to ultrasonically pulverize it to obtain a uniform protein (as the main component) solution. Wherein: the mass fraction of protein in the protein solution is 10wt% (the mass fraction of protein in the protein solution obtained by different eggs will be different); the power of ultrasonic pulverization is 15% of the power of ultrasonic cell pulverizer, pulverization time 2min;

[0069] Step 2, preparation of graphene oxide slurry:

[0070] Graphene oxide powder is dissolved in deionized water to obtain graphene oxide slurry, wherein: the concentration of the graphene oxide slurry is 5...

Embodiment 3

[0081] In this embodiment, the graphene-enhanced biomass porous carbon electromagnetic absorbing material is realized in the following steps:

[0082] Step 1, pretreatment of egg white:

[0083] Use physical dispersion to pretreat the egg white to obtain a uniform protein solution. The specific steps are as follows: separate the fresh egg white from the egg, and use an ultrasonic cell pulverizer to ultrasonically pulverize it to obtain a uniform protein (as the main component) solution. Wherein: the mass fraction of protein in the protein solution is 10wt% (the mass fraction of protein in the protein solution obtained by different eggs will be different); the power of ultrasonic pulverization is 15% of the power of ultrasonic cell pulverizer, pulverization time 2min;

[0084] Step 2, preparation of graphene oxide slurry:

[0085] Graphene oxide powder is dissolved in deionized water to obtain graphene oxide slurry, wherein: the concentration of the graphene oxide slurry is 1...

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Abstract

Abstract The present invention provides a graphene-enhanced biomass porous carbon electromagnetic wave-absorbing material and a preparation method thereof, wherein the preparation method comprises the following steps of: pretreating egg white to obtain a uniform protein solution; preparing graphene oxide slurry; adding the graphene oxide slurry obtained into the protein solution, and pulverizing to obtain a uniform protein porous carbon precursor solution; carrying out water bath heating on the protein porous carbon precursor, carrying out protein denaturation gel to obtain porous carbon precursor hydrogel, freezing with liquid nitrogen, carrying out freeze drying to obtain a dried porous carbon precursor, heating and carbonizing under Ar atmosphere to obtain the graphene-enhanced biomass porous carbon electromagnetic wave-absorbing material. According to the technical solution of the present invention, nitrogen doping of porous carbon is realized by adopting in-situ doping, and the obtained lightweight porous carbon has satisfactory electromagnetic wave absorbing performance and good mechanical strength, which has taken full advantage of the natural structure of biomass for micromorphology design. Besides, the gelation of protein implies a simple but effective process for the preparation of porous carbon, which is an environmentally friendly and low-cost way. Drawings a) b) 5.01 11CG-O.54. 'N~..4.0 -. 5- 2.5 0 CG-1 \,2. 2 4 4 II 12 14 M, I 2 6 8 1 0 I 12 14 16 IN Frequiency / Gflz Frequency / Gllz c) .11 d) 1.30 0.41- 1.25 u~1.2 CG-1 11.11CG-1 E 1.15 0.25- ms' / 11 0210 g ol ;;.3 6~ -~CG-1 0.10- 6 1C -0, iO I CG-0.551 CG-O.5 2 4 0 8 t0 13 14 16 is 4 6 0 it) 12 14 1S, INl Frequency / Gllz Frequency!Gllz

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a preparation method of a graphene-enhanced biomass porous carbon electromagnetic wave-absorbing material. Background technique [0002] Since World War I, with the popularization of electromagnetic waves, especially its application in the military, the demand for electromagnetic wave-absorbing materials has continued to increase. Taking the radar stealth coating on the surface of fighter planes as an example, electromagnetic wave-absorbing materials are moving towards lightweight , high stability, high absorbing efficiency trend. [0003] Traditional electromagnetic absorbing materials generally use metal element electromagnetic absorbing materials, which have high density, low specific absorbing strength, poor mechanical flexibility, easy corrosion, complicated processing and high cost. Moreover, due to the existence of metal elements, the ferromagnetic metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C09K3/00
CPCC09K3/00C01B32/05
Inventor 彭庆宇刘宗林赫晓东
Owner SHENZHEN STRONG ADVANCED MATERIALS RES INST CO LTD
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