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Preparation method of graphene oxide/barium ferrite wave-absorbing material

A wave-absorbing material and graphene technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of narrow absorption frequency band and low wave-absorbing efficiency, and achieve wave-absorbing performance, shortened reaction time, and simple reaction process controllable effect

Inactive Publication Date: 2015-03-25
SHANGHAI YUEDA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still shortcomings such as narrow absorption frequency band and low absorption efficiency, so the research on composite absorbing materials containing barium ferrite has positive significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 2.61g of barium nitrate and 29.02g of ferric nitrate and dissolve them in 500ml and 800ml of deionized water, and then mix the two solutions to obtain a nitrate mixed solution;

[0023] (2) Under the action of magnetic stirring, add 9.81 g of citric acid and 3.17 g of ethylene glycol to the nitrate mixed solution to obtain a nitrate-complexing agent mixed solution;

[0024] (3) Weigh 3.16g of graphene oxide and ultrasonically disperse it in 32ml of deionized water, the ultrasonic power is 150W, and the ultrasonic time is 15min to obtain the graphene oxide aqueous solution;

[0025] (4) Under the action of magnetic stirring, add the above graphene oxide aqueous solution dropwise to the nitrate-complexing agent mixed solution in step (2), mix well, add ammonia water to adjust the pH value to 6.8, and continue stirring for 2 hours to form a sol ;

[0026] (5) Heat the above sol in an 80oC water bath for 2 hours, and then place it in a blast drying oven at 120oC ...

Embodiment 2

[0028] (1) Dissolve 3.92g of barium nitrate and 43.53g of ferric nitrate in 450ml and 525ml of deionized water respectively, and then mix the two solutions to obtain a nitrate mixed solution;

[0029] (2) Under the action of magnetic stirring, 11.85 g of citric acid and 7.65 g of ethylene glycol were added to the nitrate mixed solution to obtain a nitrate-complexing agent mixed solution;

[0030] (3) Weigh 9.50g of graphene oxide and ultrasonically disperse it in 180ml of deionized water, the ultrasonic power is 200W, and the ultrasonic time is 10min to obtain the graphene oxide aqueous solution;

[0031] (4) Under the action of magnetic stirring, add the above graphene oxide aqueous solution dropwise to the nitrate-complexing agent mixed solution in step (2), mix well, add ammonia water to adjust the pH value to 7.0, and continue stirring for 3 hours to form a sol ;

[0032] (5) Heat the above sol in an 80oC water bath for 2h, and then place it in a blast drying oven at 100o...

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Abstract

The invention relates to a novel material for absorbing electromagnetic waves, and in particular relates to a preparation method of a graphene oxide / barium ferrite wave-absorbing material. The preparation method comprises the following steps: forming a sol from analytically pure barium nitrate Ba(NO3)2 and ferric nitrate Fe(NO3)3 with a graphene oxide water solution by taking citric acid and ethylene glycol as a compound complexing agent; continuously heating and stirring the sol to form a gel; and igniting the gel by virtue of microwave-assisted auto-combustion to further prepare the graphene oxide / barium ferrite wave-absorbing material. The preparation method disclosed by the invention is simple and controllable in process, uniform in temperature distribution of the entire system through microwave field heating, and meanwhile, the preparation method can be used for greatly shortening reaction time and greatly improving the wave-absorbing performance of a barium ferrite material with the doping of the graphene oxide.

Description

technical field [0001] The invention relates to a new material for absorbing electromagnetic waves, in particular to a preparation method of a graphene oxide / barium ferrite wave-absorbing material. Background technique [0002] Electromagnetic wave absorbing materials are widely used in civil and national defense fields such as microwave anechoic chambers, microwave interference protection and stealth materials. The development of new wave-absorbing materials with good structural stability, high absorption rate, wide absorption frequency band, light weight and good physical and mechanical properties is one of the important ways to realize stealth technology. Therefore, research on absorbing materials has far-reaching practical significance in both military and civilian applications. [0003] The barium ferrite ferrite material with a magnetoplumbite structure has a high magnetic anisotropy equivalent field and a high natural resonance frequency, and is one of the most promi...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 杨晓伟蔡铜祥孙龙飞
Owner SHANGHAI YUEDA NEW MATERIAL TECH
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