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Three-dimensional porous flower-like structure cobalt/carbon nano-composite electromagnetic wave absorbing material and preparation method thereof

A carbon nanocomposite, flower-like structure technology, applied in the fields of magnetic/electric field shielding, electrical components, etc., can solve the problems that are difficult to meet the requirements of high-performance electromagnetic wave absorbing materials, large-scale industrial production, and complex preparation processes, and achieve excellent Electromagnetic wave absorption performance, excellent electromagnetic wave absorption performance, and simple process

Active Publication Date: 2018-04-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, affected by the particle size, shape and uniformity of metal magnets, it is difficult to meet the requirements of high-performance electromagnetic wave absorbing materials; in addition, its complicated preparation process and high production cost are also difficult to meet the needs of large-scale industrial production
[0005] In summary, there are still many problems in the structure and performance of the existing cobalt / carbon nanocomposite electromagnetic wave absorbing materials. Therefore, it is necessary to study a new cobalt / carbon nanocomposite electromagnetic wave absorbing material

Method used

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  • Three-dimensional porous flower-like structure cobalt/carbon nano-composite electromagnetic wave absorbing material and preparation method thereof
  • Three-dimensional porous flower-like structure cobalt/carbon nano-composite electromagnetic wave absorbing material and preparation method thereof
  • Three-dimensional porous flower-like structure cobalt/carbon nano-composite electromagnetic wave absorbing material and preparation method thereof

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Embodiment 1

[0054] A method for preparing a cobalt / carbon nanocomposite electromagnetic wave absorbing material with a three-dimensional porous flower-like structure, comprising the following steps:

[0055] 1) Co(CH 3 COO) 2 4H 2 O is used as a precursor for synthesizing cobalt, polyvinylpyrrolidone is used as a surfactant, and is added to 100mL of methanol solvent at a mass ratio of 2:1. In a closed reaction kettle, react at 200°C for 3h. After the reaction is completed, the product is washed and dried. , to obtain cobalt hydroxide; calcining the obtained cobalt hydroxide at 350° C. for 3 hours to obtain tricobalt tetroxide powder;

[0056] 2) Mix 1.5g of cobalt tetroxide powder with 0.5g of pyrrole in step 1), and then react in a closed reaction kettle at 550°C for 5 hours to obtain a three-dimensional porous flower-like cobalt / carbon nanocomposite electromagnetic wave absorbing material.

[0057] The TG test was carried out on the electromagnetic wave absorbing material prepared in...

Embodiment 2

[0065] A method for preparing a cobalt / carbon nanocomposite electromagnetic wave absorbing material with a three-dimensional porous flower-like structure, comprising the following steps:

[0066] 1) CoCl 2 ·6H 2 O is used as a precursor for synthesizing cobalt, polyvinylpyrrolidone is used as a surfactant, and is added to 100mL methanol solvent at a mass ratio of 1:0.5. In a closed reaction kettle, react at 100°C for 30h. After the reaction is completed, the product is washed and dried. , to obtain cobalt hydroxide; calcining the obtained cobalt hydroxide at 300° C. for 5 hours to obtain tricobalt tetroxide powder;

[0067] 2) Mix 5g of cobalt tetroxide powder with 2g of pyrrole in step 1), and then react in a closed reaction kettle at 500°C for 30 hours to obtain a three-dimensional porous flower-like cobalt / carbon nanocomposite electromagnetic wave absorbing material.

[0068] The TG test was carried out on the electromagnetic wave absorbing material prepared in this embod...

Embodiment 3

[0072] A method for preparing a cobalt / carbon nanocomposite electromagnetic wave absorbing material with a three-dimensional porous flower-like structure, comprising the following steps:

[0073] 1) CoSO 4 ·6H 2 O is used as a precursor for synthesizing cobalt, polyvinylpyrrolidone is used as a surfactant, and is added to 100mL methanol solvent at a mass ratio of 1:4. In a closed reaction kettle, react at 400°C for 2 hours. After the reaction is completed, the product is washed and dried. , to obtain cobalt hydroxide; calcining the prepared cobalt hydroxide at 500°C for 1 hour to obtain tricobalt tetroxide powder;

[0074] 2) Mix 4g of cobalt tetroxide powder with 2g of pyrrole in step 1), and then react in a closed reaction kettle at 600°C for 2 hours to obtain a three-dimensional porous flower-like cobalt / carbon nanocomposite electromagnetic wave absorbing material.

[0075] A TG test was performed on the electromagnetic wave absorbing material prepared in this embodiment,...

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Abstract

The invention relates to a three-dimensional porous flower-like structure cobalt / carbon nano-composite electromagnetic wave absorbing material. Carbon in the electromagnetic wave absorbing material forms a three-dimensional skeleton in a flower-like structure, and carbon coated cobalt particles are uniformly distributed on a carbon matrix. The preparation method comprises the following steps: 1) serving divalent inorganic cobalt salt as a precursor of cobalt hydroxide, and dissolving the divalent inorganic cobalt salt and surfactant into a solvent according to a certain mass ratio; carrying out reaction under an enclosed condition, and after reaction, carrying out washing and drying on the product to obtain the cobalt hydroxide; carrying out calcination treatment on the prepared cobalt hydroxide to obtain cobaltosic oxide powders; and 2) mixing the cobaltosic oxide powders obtained in the step 1) with a carbon source, and carrying out reaction under an enclosed condition to obtain thethree-dimensional porous flower-like structure cobalt / carbon nano-composite electromagnetic wave absorbing material. The prepared electromagnetic wave absorbing material is high in saturation magnetization, high in coercive force, light in weigh and high in oxidation resistance and has an excellent electromagnetic wave absorption performance.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorbing materials, in particular to a cobalt / carbon nanocomposite electromagnetic wave absorbing material with a three-dimensional porous flower-like structure and a preparation method thereof. Background technique [0002] With the application and popularization of radio communication technology, the problems of electromagnetic wave interference and electromagnetic wave pollution have become increasingly prominent, becoming a potential threat to human health, and at the same time reducing the quality of human communication. These problems have inspired people to study electromagnetic wave absorbing materials. enthusiasm. According to the loss mechanism of electromagnetic waves, electromagnetic wave absorbing materials can be mainly divided into two types: magnetic loss materials and dielectric loss materials. Among them, magnetic loss materials have become a current research hotspo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 刘久荣刘伟吴莉莉吴楠楠汪宙
Owner SHANDONG UNIV
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