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A preparation method of Fe3O4@iron core-shell structure-graphene composite wave-absorbing material

A graphene composite, ferric oxide technology, applied in chemical instruments and methods, other chemical processes and other directions, can solve the problems of reduced high-frequency absorbing performance, narrow frequency bandwidth, etc., to enhance the absorbing performance, suppress agglomeration, Overcome the effects of high density

Active Publication Date: 2017-04-26
智玺那诺(上海)生物科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of ferrite absorbing materials is that the high-frequency band has a narrow frequency bandwidth due to the reduced absorbing performance, and it is difficult to meet the requirements for broadband absorption of absorbing materials in the new era. It needs to be combined with other materials to make up for the deficiency

Method used

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  • A preparation method of Fe3O4@iron core-shell structure-graphene composite wave-absorbing material

Examples

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Effect test

Embodiment 1

[0020] (1) Take a certain amount of K 3 [Fe(CN) 6 ] was dissolved in deionized water with a controlled concentration of 0.1 mol / L, put into polytetrafluoroethylene for hydrothermal reaction at a temperature of 140 °C for 2 days, and brick-red leaf-like α-Fe was obtained 2 o 3 ;

[0021] (2) Disperse a certain mass of graphene oxide in 150 ml of absolute ethanol, and ultrasonically disperse for 30 min to obtain a dispersion concentration of 5 mg / mL graphene oxide dispersion; the α-Fe produced in (1) 2 o 3 Add the graphene oxide ethanol dispersion at a mass ratio of 1:3 to the graphene oxide, and add 50 ml of glycerol, and stir magnetically for 4 h. Then the mixed solution was placed in a hydrothermal reactor for hydrothermal reduction at a temperature of 200 °C and a reaction time of 12 h. After the reaction, the sediment was centrifuged in a centrifuge at a speed of 10,000 r / min for 10 min. During the centrifugation process, it was washed 3 times with absolute ethanol. T...

Embodiment 2

[0025] (1) Take a certain amount of K 3 [Fe(CN) 6 ] was dissolved in deionized water, and the concentration was controlled at 0.1 mol / L, and put into polytetrafluoroethylene for hydrothermal reaction at a temperature of 140 °C for 2 days to obtain brick-red leaf-like α-Fe 2 o 3 ;

[0026] (2) Disperse a certain mass of graphene oxide in 150 ml of absolute ethanol, and disperse it ultrasonically for 30 min to obtain a dispersion of graphene oxide with a dispersion concentration of 3 mg / mL; the α-Fe produced in (1) 2 o 3 Add graphene oxide to ethanol dispersion liquid at a mass ratio of 1:1 to graphene oxide, and add 50 ml of glycerol, and magnetically stir for 4 h. Then the mixed solution was placed in a hydrothermal reactor for hydrothermal reduction at a temperature of 180 °C and a reaction time of 12 h. After the reaction, the sediment was centrifuged in a centrifuge at a speed of 10,000 r / min for 10 min. During the centrifugation process, it was washed 3 times with abs...

Embodiment 3

[0030] (1) Take a certain amount of K 3 [Fe(CN) 6 ] was dissolved in deionized water with a controlled concentration of 0.1 mol / L, put into polytetrafluoroethylene for hydrothermal reaction at a temperature of 140 °C for 2 days, and brick-red leaf-like α-Fe was obtained 2 o 3 ;

[0031] (2) Disperse a certain mass of graphene oxide in 150 ml of absolute ethanol, and disperse it ultrasonically for 30 min to obtain a dispersion of graphene oxide with a dispersion concentration of 3 mg / mL; the α-Fe produced in (1) 2 o 3 Add the graphene oxide ethanol dispersion in a mass ratio of 1:1 to the graphene oxide, and add 50 ml of glycerol, and stir magnetically for 3 h. Then the mixed solution was placed in a hydrothermal reactor for hydrothermal reduction at a temperature of 160 °C and a reaction time of 12 h. After the reaction, the sediment was centrifuged in a centrifuge at a speed of 10,000 r / min for 10 min. During the centrifugation process, it was washed 3 times with absolut...

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Abstract

The invention relates to a preparation method of a ferroferric oxide @ iron core shell structure-graphene composite absorbing material. The preparation method is characterized in that K3[Fe(CN)6] and graphene oxide are taken as the raw materials, and further comprises three steps: firstly, on the basis of taking K3[Fe(CN)6] as the raw material, carrying out hydrothermal reaction to prepare tree-leaf-shaped alpha-Fe2O3; secondly, mixing alpha-Fe2O3 with graphene oxide, and on the basis of taking absolute ethyl alcohol as a solvent, carrying out hydrothermal reduction to produce alpha-Fe2O3-reduced graphene oxide composite material; finally, performing reduction on the alpha-Fe2O3-reduced graphene oxide composite material under a mixed atmosphere of hydrogen and argon, so as to obtain the ferroferric oxide @ iron core shell structure-graphene composite absorbing material. The preparation method is simple, controllable, can effectively broaden the absorbing range of a single material, and can further strengthen the absorbing property.

Description

technical field [0001] The invention relates to the field of microwave absorption, in particular to a preparation method of ferric oxide@iron core-shell structure-graphene composite microwave-absorbing material. Background technique [0002] With the rapid development of radar and microwave electronic technology, stealth technology, as an effective means to improve the survival, penetration and deep strike of weapon systems, has become one of the research hotspots of military powers in various countries. At the same time, the use of electronic equipment in daily life generates a large amount of electromagnetic waves, leading to problems of electromagnetic wave interference, radio frequency or radio interference. With the development of the times and technology, absorbing materials should have excellent electromagnetic wave absorption performance in the widest range of electromagnetic wave frequencies as possible, and also require properties such as light weight, temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
Inventor 何丹农章龙林琳董毅金彩虹
Owner 智玺那诺(上海)生物科技有限责任公司
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