Ferrocobalt nanocrystalline-graphene composite material and preparation method and application thereof

A technology of iron-cobalt alloy and composite materials, which is applied in the field of electromagnetic wave materials, can solve the problems of reducing electromagnetic properties, and achieve the effects of good wave-absorbing performance, cheap and easy-to-obtain raw materials, and good economic prospects

Inactive Publication Date: 2014-12-10
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nanocrystals of cobalt and iron are easily agglomerated and oxidized when exposed to air, forming antiferromagnetic cobalt and iron oxides, which reduce their electromagnetic properties

Method used

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  • Ferrocobalt nanocrystalline-graphene composite material and preparation method and application thereof
  • Ferrocobalt nanocrystalline-graphene composite material and preparation method and application thereof
  • Ferrocobalt nanocrystalline-graphene composite material and preparation method and application thereof

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preparation example Construction

[0031] The preparation method of the above-mentioned iron-cobalt alloy nanocrystal-graphene composite material comprises the following steps:

[0032] a) After mixing graphite oxide and N-methylpyrrolidone, disperse to obtain the first dispersion liquid, wherein the mass ratio of graphite oxide to N-methylpyrrolidone is preferably 0.8 g / L to 1.6 g / L; The method of dispersion is preferably ultrasonic dispersion, vibration dispersion or a combination thereof, more preferably ultrasonic dispersion, and the time of ultrasonic dispersion is not specifically limited in the present invention, as long as the first dispersion liquid that can be uniformly dispersed is obtained.

[0033] b) Iron acetylacetonate, cobalt acetylacetonate, octadecylamine and potassium hydroxide are added to the first dispersion liquid, and continue to disperse to obtain the second dispersion liquid, wherein the quality of graphite oxide is the same as that of iron acetylacetonate, acetylacetonate The ratio o...

Embodiment 1

[0054] Weigh homemade 40mg of graphite oxide and 25ml of N-methylpyrrolidone in a 50ml beaker, ultrasonically disperse for about 2 hours to obtain the first brown dispersion liquid; , a total amount of 3 mmol, was added to the first dispersion, and then 1 g of octadecylamine and 0.5 g of potassium hydroxide were added, and the ultrasonic wave was continued until the dispersion was uniformly mixed to obtain the second dispersion;

[0055] In the fume hood, add 3ml of hydrazine hydrate to the second dispersion liquid, pass through protective gas N 2 After 5 minutes, the oxygen dissolved in the solution was removed to obtain the third dispersion liquid, and then the third dispersion liquid was transferred to a 100 ml polytetrafluoroethylene reactor, and reacted at 160° C. for 1 hour. The reaction product was separated by centrifugation in a high-speed refrigerated centrifuge, then washed alternately with cyclohexane and acetone for 3 times, and then alternately washed with deioni...

Embodiment 2

[0057] Weigh homemade 40mg of graphite oxide and 35ml of N-methylpyrrolidone in a 50ml beaker, ultrasonically disperse for about 2 hours to obtain the first brown dispersion liquid; , a total amount of 5 mmol, was added to the first dispersion, and then 2 g of octadecylamine and 1 g of potassium hydroxide were added, and the ultrasound was continued until the dispersion was uniformly mixed to obtain the second dispersion;

[0058] In the fume hood, add 5ml of hydrazine hydrate to the second dispersion, pass through the protective gas Ar for 5min, and get rid of the dissolved oxygen in the solution to obtain the third dispersion, then transfer the third dispersion to a 100ml polytetrafluoroethylene reactor , reacted at 180°C for 2 hours. The product was separated by centrifugation, washed alternately with n-hexane and acetone for three times, then alternately washed twice with deionized water and ethanol, filtered, and vacuum-dried at 40°C for 24 hours.

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Abstract

The embodiment of the invention discloses a ferrocobalt nanocrystalline-graphene composite material and a preparation method and application thereof. The composite material comprises graphene and ferrocobalt nanocrystalline dispersed and / or wrapped in the graphene, or is composed of graphene and ferrocobalt nanocrystalline, wherein a molar ratio of iron to cobalt in ferrocobalt nanocrystalline is (3:7)-(7:3). The ferrocobalt nanocrystalline-graphene composite material prepared by the invention is good in wave-absorbing performance. The preparation method is simple and feasible, the raw materials are low in price and readily available, and compared with the other preparation modes, the preparation method disclosed by the invention has good economic prospects.

Description

technical field [0001] The invention relates to the field of electromagnetic wave materials, in particular to an iron-cobalt alloy nanocrystal-graphene composite material, a preparation method and application thereof. Background technique [0002] With the development of science and technology, people are increasingly concerned about the impact of electromagnetic radiation on human health. A considerable number of theoretical and experimental studies have focused on the design and manufacture of effective electromagnetic wave absorbing materials and devices, which have attracted widespread attention because of their thin thickness, light weight, high reflection loss, and wide absorption frequency. [0003] Cobalt and iron are typical soft metal magnetic materials and show large magnetic anisotropy, so small-sized cobalt and iron nanocrystals have strong electromagnetic properties. However, nanocrystals of cobalt and iron are easily agglomerated and oxidized when exposed to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 孙根班马腾潘国华马淑兰
Owner BEIJING NORMAL UNIVERSITY
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