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Graphene-loaded nanometer Fe<3>O<4>/ZnO composite and preparation method thereof

A technology of graphene nanosheets and composite materials, which is applied in the field of graphene-loaded nano-Fe3O4/ZnO composite materials and its preparation, can solve the problems that the low-frequency magnetic field shielding effect cannot be achieved, and the shielding mechanism is only due to dielectric loss. Industrialized production and application, easy industrialized production and application, good electrical conductivity

Active Publication Date: 2016-03-09
TANGSHAN JIANHUA TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene has a good application prospect in the field of electromagnetic shielding, but its shielding mechanism is only due to dielectric loss, and it cannot achieve a good shielding effect on low-frequency magnetic fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take Zn powder and FeCl with a mass ratio of 0.04:1 3 ·6H 2 Add O into deionized water, stir for 0.5h in a water bath environment at 50°C, and the stirring speed is 200r / min. After mixing evenly, add NaOH solution dropwise to adjust the pH of the mixture to 9, and continue stirring for more than 30min until the mixture is evenly mixed. ; The Zn powder is granular or flaky, the mesh number is greater than 400 mesh, the Zn content is greater than 90%, FeCl 3 ·6H 2 O solution concentration is 0.01mol / L.

[0027] (2) According to FeCl 3 ·6H 2 O: Graphene oxide with a mass ratio of 1.75:1 Weigh graphene oxide and dissolve it in deionized water to obtain a graphene oxide aqueous solution with a mass concentration of 0.05%, add it to the suspension in step (1), and stir evenly ,stand-by.

[0028] (3) The mixed solution obtained in step (2) was placed in a closed reaction kettle, and hydrothermally reacted at a temperature of 160° C. for 12 hours.

[0029] (4) Take o...

Embodiment 2

[0032] (1) Take Zn powder and FeCl with a mass ratio of 0.08:1 3 ·6H 2 O was added to deionized water, stirred in a water bath at 30°C for 1 hour, and the stirring speed was 500 r / min. After mixing evenly, drop in KOH solution to adjust the pH of the mixture to 12, and continue stirring for more than 30 minutes until the mixture was evenly mixed; The Zn powder is granular or flaky, with a mesh size greater than 400 mesh, a Zn content greater than 90%, FeCl 3 ·6H 2 O solution concentration is 0.1mol / L.

[0033] (2) According to FeCl 3 ·6H 2 O: The mass ratio of graphene oxide is 7:1. Weigh graphene oxide and dissolve it in deionized water to obtain a graphene oxide aqueous solution with a mass concentration of 3%. Add it to the suspension in step (1) and stir evenly ,stand-by.

[0034] (3) The mixed solution obtained in step (2) was placed in a closed reaction kettle, and subjected to hydrothermal reaction at a temperature of 180° C. for 5 hours.

[0035] (4) Take out th...

Embodiment 3

[0038] (1) Take Zn powder and FeCl with a mass ratio of 0.04:1 3 ·6H 2 Add O into deionized water, stir for 1.5h in a water bath environment at 40°C, and stir at a speed of 500r / min. After mixing evenly, drop Na 2 CO 3Solution, adjust the pH of the mixed solution to 10, continue to stir, and the duration is longer than 30min, until the mixing is uniform; the Zn powder is granular or flake, the mesh number is greater than 400 mesh, the Zn content is greater than 90%, and the FeCl 3 ·6H 2 O solution concentration is 2mol / L.

[0039] (2) According to FeCl 3 ·6H 2 O: The mass ratio of graphene oxide is 10.5:1. Weigh graphene oxide and dissolve it in deionized water to obtain a graphene oxide aqueous solution with a mass concentration of 2%. Add it to the suspension in step (1) and stir evenly ,stand-by.

[0040] (3) The mixed solution obtained in step (2) was placed in a closed reaction kettle, and hydrothermally reacted at a temperature of 200° C. for 12 hours.

[0041] (...

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Abstract

The invention relates to a graphene-loaded nanometer Fe<3>O<4> / ZnO composite with an electromagnetic shielding function and a preparation method thereof. Te preparation method includes the steps that firstly, ferric chloride hexahydrate and Zn powder are mixed to be uniform after no sediment exists, an alkaline solution and a graphene oxide solution are added, and after the mixture is stirred to be uniform, suspension liquid is obtained; then, the suspension liquid is placed in a reaction kettle to be subjected to constant temperature heat treatment, centrifugal separation is conducted, and obtained paste-shaped solid is placed in a tube-shaped furnace to be subjected to thermal recovery under the mixed atmosphere of H<2> / Ar after being refrigerated and dried; finally, the graphene-loaded nanometer Fe<3>O<4> / ZnO composite is obtained. The graphene-loaded nanometer Fe<3>O<4> / ZnO composite prepared through the method is high in degree of dispersion and good in water solubility, the magnetic property and the electromagnetic shielding property are remarkably enhanced, the operation process is simple and efficient, and industrialized production and application is achieved easily.

Description

technical field [0001] The invention relates to composite materials, in particular to a graphene-loaded nano-Fe with electromagnetic shielding function 3 o 4 / ZnO composite material and its preparation method. Background technique [0002] At present, electromagnetic pollution has become the fourth major public hazard that threatens human health after noise pollution, water pollution, and air pollution. In order to prevent electromagnetic pollution, using electromagnetic shielding materials for shielding is one of the main preventive methods. Density and economical electromagnetic shielding materials are the focus of research and development. [0003] Graphene has a unique structure and excellent physical and chemical properties, high strength, huge specific surface area and low density, and has become a hot spot for researchers. Graphene has good application prospects in the field of electromagnetic shielding, but its shielding mechanism is only due to dielectric loss, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B1/00B82B3/00C01B31/04C01G49/08C01G9/02H05K9/00G12B17/02
CPCB82B1/00B82B3/00C01G9/02C01G49/08G12B17/02H05K9/00
Inventor 吴洪鹏孟英耿晓欣侯林艳王建华
Owner TANGSHAN JIANHUA TECH DEV
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