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Three-dimensional porous sheet ferroferric oxide/carbon nanometer electromagnetic wave absorption material and preparing method thereof

A technology of ferroferric oxide and absorbing materials, which is applied in the directions of magnetic materials, inorganic material magnetism, magnetic field/electric field shielding, etc., can solve the problems of low reflection loss intensity, achieve low production cost, improve electromagnetic wave absorption performance, and high magnetic permeability rate effect

Active Publication Date: 2018-05-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these Fe 3 o 4 / C nanocomposites are limited to one-dimensional or two-dimensional structures, and the maximum reflection loss intensity is low

Method used

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  • Three-dimensional porous sheet ferroferric oxide/carbon nanometer electromagnetic wave absorption material and preparing method thereof
  • Three-dimensional porous sheet ferroferric oxide/carbon nanometer electromagnetic wave absorption material and preparing method thereof
  • Three-dimensional porous sheet ferroferric oxide/carbon nanometer electromagnetic wave absorption material and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0054] A method for preparing a three-dimensional porous lamellar Fe3O4 / carbon nanometer electromagnetic wave absorbing material, comprising the following steps:

[0055] 1) FeCl 3 ·6H 2 O, urea is as the precursor of synthesizing ferric oxide, and polyvinylpyrrolidone is as surfactant, adds in the 100mL ethylene glycol solvent by mass ratio 3:4:4, and in airtight reactor, reacts 10h under 180 ℃, After the reaction is completed, the product is washed and dried to obtain iron oxyhydroxide; the prepared iron oxyhydroxide is calcined at 350°C for 3 hours to obtain ferric oxide powder;

[0056] 2) Mix 1.5g of ferric oxide powder in step 1) with 0.5g of pyrrole, and then react in a closed reaction kettle at 550°C for 5h to obtain a three-dimensional porous lamellar ferric oxide / carbon nano Electromagnetic wave absorbing material.

[0057] The TG test was carried out on the electromagnetic wave absorbing material prepared in this embodiment, and the mass percentages of carbon and...

Embodiment 2

[0065] A method for preparing a three-dimensional porous lamellar Fe3O4 / carbon nanometer electromagnetic wave absorbing material, comprising the following steps:

[0066] 1) Fe(NO 3 ) 3 9H 2 O, urea is as the precursor of synthesizing ferric oxide, and polyvinylpyrrolidone is as surfactant, adds in 100mL ethylene glycol solvents by mass ratio 3:4:2, and in airtight reactor, reacts 30h under 100 ℃, After the reaction is completed, the product is washed and dried to obtain iron oxyhydroxide; the prepared iron oxyhydroxide is calcined at 300°C for 5 hours to obtain ferric oxide powder;

[0067] 2) Mix 2g of ferric oxide powder in step 1) with 1g of pyrrole, and then react in a closed reaction kettle at 500°C for 30h to obtain a three-dimensional porous layered ferric oxide / carbon nanometer electromagnetic wave absorber Material.

[0068] The TG test was carried out on the electromagnetic wave absorbing material prepared in this embodiment, and the mass percentages of carbon a...

Embodiment 3

[0072] A method for preparing a three-dimensional porous lamellar Fe3O4 / carbon nanometer electromagnetic wave absorbing material, comprising the following steps:

[0073] 1) Fe(NO 3 ) 3 9H 2 O, urea is used as the precursor of synthesizing ferroferric oxide, and polyvinylpyrrolidone is used as surfactant, adds in 100mL ethylene glycol solvents by mass ratio 1:3:0.5, and in airtight reactor, reacts 2h under 400 ℃, After the reaction is completed, the product is washed and dried to obtain iron oxyhydroxide; the obtained iron oxyhydroxide is calcined at 500°C for 1 hour to obtain ferric oxide powder;

[0074] 2) Take 4g of ferric oxide powder in step 1) and mix with 1g of pyrrole, and then react in a closed reaction kettle at 600°C for 2h to obtain a three-dimensional porous lamellar ferric oxide / carbon nanometer electromagnetic wave absorption Material.

[0075]The TG test was carried out on the electromagnetic wave absorbing material prepared in this embodiment, and the mas...

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Abstract

The invention relates to a three-dimensional porous sheet ferroferric oxide / carbon nanometer electromagnetic wave absorption material and a preparing method thereof. Carbon in the electromagnetic waveabsorption material forms a three-dimensional framework of a flower-shaped structure, and ferroferric oxide particles wrapped by carbon are evenly distributed on a carbon base body. The preparing method includes the steps of firstly, making trivalent inorganic ferrite and urea as precursors for synthesizing ferroferric oxide dissolved together with a surface active agent in a solvent according toa certain mass ratio to have a reaction under closed conditions, washing and drying a product after the reaction is completed to prepare hydroxyl ferric oxide, and calcinating the prepared hydroxyl ferric oxide to obtain ferric oxide powder; secondly, mixing the ferric oxide powder in the first step with a carbon source to have a reaction under closed conditions to obtain the three-dimensional porous sheet ferroferric oxide / carbon nanometer electromagnetic wave absorption material. The electromagnetic wave absorption material is high in saturated magnetic susceptibility, large in coercivity,light in weight, strong in oxidization resistance and excellent in electromagnetic wave absorption performance.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorbing materials, in particular to a three-dimensional porous lamellar Fe3O4 / carbon nanometer electromagnetic wave absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of remote sensing detection, computer, communication and other electronic technologies, the increasing problem of electromagnetic interference makes electromagnetic wave absorbing materials receive more and more attention. With the continuous increase of space electromagnetic energy density, the application of electromagnetic wave absorbing materials in the field of electromagnetic pollution protection and military technology is attracting widespread attention from all over the world. According to the loss mechanism of electromagnetic waves, electromagnetic wave absorbing materials can be mainly divided into two types: magnetic materials and dielectric material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/01H01F41/00H05K9/00
CPCH01F1/0054H01F1/01H01F41/00H05K9/0081
Inventor 刘久荣刘伟吴莉莉吴楠楠汪宙
Owner SHANDONG UNIV
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