Core-shell structure C@CoNi composite material as well as preparation method and application thereof

A composite material, core-shell structure technology, used in carbon preparation/purification, transportation and packaging, metal processing equipment, etc. The effect of strong absorbing ability

Inactive Publication Date: 2020-01-10
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such magnetic metal materials exhibit excellent microwave-absorbing performance, they all have fatal disadvantages: they are easy to oxidize, and because they are metals, their excellent electrical conductivity will cause eddy current loss, which may be detrimental to the microwave-absorbing performance
However, the problem of oxidation resistance has not been solved, so the future research of such materials will focus on the combination of magnetic metals and other oxidation-resistant substances to improve the oxidation resistance of their practical applications.

Method used

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  • Core-shell structure C@CoNi composite material as well as preparation method and application thereof
  • Core-shell structure C@CoNi composite material as well as preparation method and application thereof
  • Core-shell structure C@CoNi composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a core-shell structure C@CoNi composite material, comprising the following steps:

[0031] (1) Add 8 g of glucose and 0.2 g of cetyltrimethylammonium bromide (CTAB) into 70 mL of water, and stir well at room temperature;

[0032] (2) Transfer the solution obtained in step (1) to a polytetrafluoroethylene reactor, and set the temperature in a drying oven at 190 °C for hydrothermal reaction for 15 h;

[0033] (3) After the hydrothermal reaction in step (2), the precipitate was taken out, washed three times with distilled water, then washed three times with absolute ethanol, and dried to obtain precursor carbon spheres;

[0034] (4), 6 mmol (0.072 g) carbon spheres, 1 mmol CoCl 2 ·6H 2 O, 1 mmol NiCl 2 ·6H 2 O. Disperse 6 mL of hydrazine hydrate in 60 mL of water and stir evenly at room temperature;

[0035] (5) Transfer the solution obtained in step (4) to a polytetrafluoroethylene reactor, and set the temperature in a drying oven at 170 °C for...

Embodiment 2

[0043] The difference from Example 1 is that the CoCl in step (4) 2 ·6H 2 O and NiCl 2 ·6H 2 The amount of O was changed to 0.5 mmol at the same time, and the obtained product was marked as A-2 sample; others were the same as in Example 1.

Embodiment 3

[0045]The difference from Example 1 is that the CoCl in step (4) 2 ·6H 2 O and NiCl 2 ·6H 2 The amount of O was changed to 0.75 mmol at the same time, and the obtained product was marked as A-3 sample; others were the same as in Example 1.

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Abstract

The invention belongs to the technical field of electromagnetic wave absorbing materials, and discloses a core-shell structure C@CoNi composite material as well as a preparation method and applicationthereof. The composite material is a core-shell structure formed by uniformly wrapping several CoNi alloy particles around a carbon sphere, and the CoNi alloy particles are in a flower-like structure. The preparation method comprises the following steps of adding glucose and hexadecyl trimethyl ammonium bromide into water, and uniformly stirring; carrying out standing hydrothermal reaction on theobtained solution at a temperature of 180-200 DEG C for 12-15 hours; after the hydrothermal reaction is finished, taking out precipitate, and cleaning and drying to obtain a precursor carbon sphere;dispersing the carbon sphere, water-soluble cobalt salt, water-soluble nickel salt and hydrazine hydrate in water, and uniformly stirring; carrying out standing hydrothermal reaction on the obtained solution at a temperature of 160-180 DEG C for 15-18 hours; and after the hydrothermal reaction is finished, taking out precipitate, and cleaning and drying to obtain the core-shell structure C@CoNi composite material. The C@CoNi composite material of the prepared core-shell structure has good electromagnetic wave absorption characteristics.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, and in particular relates to a core-shell structure C@CoNi composite material and its preparation method and application. Background technique [0002] Today, electromagnetic radiation pollution is becoming more and more serious, which not only affects the operation of electronic equipment, but also affects human health and military applications. Researchers focus on designing and fabricating highly efficient microwave absorbing materials to solve serious electromagnetic problems. The microwave absorption performance of microwave-absorbing materials has a lot to do with the complex magnetic permeability and permittivity and their synergistic matching. These electromagnetic parameters can be effectively tuned by constructing magnetic and / or dielectric elements. In particular, the dielectric loss can be significantly enhanced by proper integration of specific micr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B22F1/00C01B32/05H01Q17/00
CPCB22F9/24C01B32/05H01Q17/00B22F1/0553B22F1/054B22F1/07B22F1/17
Inventor 赵彪张锐李阳郭晓琴白中义王若名范冰冰樊磊关莉
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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