Nano composite absorbing material and preparation method thereof

A nano-composite and wave-absorbing material technology, applied in the field of electromagnetics, can solve the problems that wave-absorbing materials cannot achieve stability, acid resistance, oxidation resistance, electromagnetic wave absorption, acid resistance, oxidation resistance, and composite material instability. Good application value, excellent microwave absorption performance, strong acid resistance effect

Active Publication Date: 2016-09-21
SOUTHWEST INST OF APPLIED MAGNETICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the composite absorbing materials of magnetic nanoparticles and graphene are generally prepared by co-precipitation method and solvothermal method. The composite absorbing materials prepared by these methods are deposited on the surface of graphene by physical adsorption or electrostatic interaction. , the composite materials formed by these methods are unstable, acid resistance and oxidation resistance are not strong, and the nanoparticles are easy to agglomerate, and are easy to fall off from the graphene surface during use.
[0004] Therefore, the existing wave-absorbing materials cannot meet the requirements of stability, acid resistance, oxidation resistance and effective absorption of electromagnetic waves.

Method used

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  • Nano composite absorbing material and preparation method thereof
  • Nano composite absorbing material and preparation method thereof
  • Nano composite absorbing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: CoFe 2 o 4 Preparation method of / RGO composite absorbing material

[0023] Such as figure 1 shown, including the following steps:

[0024] Step (1): Preparation of Alkynylated Cobalt Ferrite

[0025] Weigh Fe(NO 3 ) 3 · 9H 2 O and Co(NO 3 ) 2 · 6H 2 O ingredients, dissolve it in a beaker of deionized water, and stir, after it is completely dissolved, add ammonia water and adjust the pH of the solution to 9, transfer the solution to a polytetrafluoroethylene lined reactor, at 180 ° C Keep it warm for 10 hours, wash and freeze-dry after cooling at room temperature to obtain cobalt ferrite nanopowder, such as figure 2 As shown, the average particle size of cobalt ferrite nanoparticles is 10~20nm; according to the mass ratio of cobalt ferrite to polyacrylic acid 3:1, the cobalt ferrite nanoparticles are ultrasonically dispersed in the aqueous solution of polyacrylic acid, and then Stir rapidly at 95°C for 1 hour, then acidify, wash, and freeze-dry; ...

Embodiment 2

[0032] NiFe 2 o 4 , The preparation method of graphene is respectively the same as embodiment 1 step (1), step (2), weighs the alkynylation NiFe by mass ratio 5:1 2 o 4 and graphene azide, the preparation method is the same as the step (3) of Example 1 to obtain NiFe 2 o 4 / RGO composite absorbing material B. The prepared composite material B has a frequency bandwidth of 4.8GHz in which the reflectivity loss value is lower than -10dB within 2~18GHz, and the minimum reflectivity loss value can reach -44dB (5.6GHz).

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Abstract

The invention discloses a preparation method of a nano composite absorbing material, belonging to the field of electromagnetic. The preparation method comprises the steps of first preparing alkynyl modified magnetic nano particles, and preparing an azide modified graphene oxide substrate by taking graphite as a raw material, then chelating the alkynyl modified magnetic nano particles on the surface of tazide modified graphene oxide in a covalent manner through a cycloaddition reaction, and finally reducing by using hydrazine hydrate, so as to form the nano composite absorbing material; according to the preparation method disclosed by the invention, magnetic nano particles are chelated on the surface of the graphene in the covalent manner through a click coupling method, and the chelated nano particles are not liable to fall off from the surface of the graphene, thus a graphene-ferrite composite material has good conductivity and magnetic property, and has the advantages of high acid resistance, good stability, high practicability and the like; meanwhile, the impedance matching performance of the absorbing material is improved, the material prepared by the invention has better microwave absorbing property on a C waveband and a Ku waveband, and has important application value in the field of electromagnetic shielding.

Description

technical field [0001] The invention relates to the field of electromagnetics, in particular to a nanocomposite wave-absorbing material and a preparation method thereof. Background technique [0002] With the development of modern science and technology, the use of electronic and electrical equipment such as electric power (power transmission and transformation, household appliances, etc.), microwaves (microwave ovens, microwave signal transmission towers, etc.), radio waves (mobile phone mobile communications, radio and television transmission towers, etc.) It has been quite popular, and the complex electromagnetic environment formed is also becoming more and more serious. The electromagnetic radiation and electromagnetic interference produced are extremely harmful to the human body and electronic equipment. It is recognized as the fourth largest pollution after air pollution, noise pollution and water pollution, and has become a hot issue of social and scientific concern. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 张明徐光亮张芦李忭刘子瑜
Owner SOUTHWEST INST OF APPLIED MAGNETICS
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