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Ni/NiO-C composite material with porous structure and preparation method and application thereof

A composite material and porous structure technology, which is applied in chemical instruments and methods, and other chemical processes, can solve problems such as increasing the weight of electromagnetic wave absorbing films, reducing magnetization, and strong magnetic loss, so as to improve electron transfer efficiency and wave absorption. The effect of strong capacity and low density

Active Publication Date: 2019-12-17
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High saturation magnetization of magnetic metals leads to high Snoek limit and permeability in high frequency region, which leads to strong magnetic losses
However, metallic Ni always has a high density and is easily oxidized, which not only increases the weight of the electromagnetic wave absorbing film, but also leads to a decrease in the magnetization

Method used

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  • Ni/NiO-C composite material with porous structure and preparation method and application thereof
  • Ni/NiO-C composite material with porous structure and preparation method and application thereof
  • Ni/NiO-C composite material with porous structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a porous structure Ni / NiO-C composite material, comprising the following steps:

[0029] (1) Use an analytical balance to weigh 15 mmol glucose and 2 mmol NiSO 4 ·6H 2 O, 10 mmol urea;

[0030] (2) Measure 60 mL of deionized water into a glass beaker;

[0031] (3), first slowly add glucose into the glass beaker, and then slowly add NiSO in turn 4 ·6H 2 O, urea, magnetic stirring for 1 h;

[0032] (4) Transfer the homogeneously mixed solution from the glass beaker to a polytetrafluoroethylene autoclave, and then react in a drying oven at 190 °C for 15 h;

[0033] (5) After the reaction, the black precipitate was taken out from the reactor, and washed three times with distilled water and then with anhydrous ethanol for three times, and then dried in a drying oven at 60 °C for 9 h to obtain the precursor;

[0034] (6) Under nitrogen atmosphere in a tube furnace, put the obtained precursor in a small porcelain boat, heat it up to a calcination ...

Embodiment 2

[0036] The difference from Example 1 is that the calcination temperature in step (6) is changed to 500° C., and the obtained calcined product is designated as N-500 sample;

Embodiment 3

[0038] The difference from Example 1 is that the calcination temperature in step (6) is changed to 600° C., and the obtained calcined product is labeled as N-600 sample; the others are 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 Ni / NiO-C composite material with a porous structure as well as a preparation method and application thereof. The composite material comprises carbon spheres and Ni / NiO composite particles attached to the surfaces of the carbon spheres, micropores are distributed in the surfaces of the carbon spheres, and the Ni / NiO composite particles are flower-shaped. The preparation method comprises the following steps: adding glucose, water-soluble nickel salt and urea into water, and uniformly stirring; controlling the temperature of the obtained solution at 170-190 DEG C, standing and carrying out hydrothermal reaction for 15-18 hours; after the hydrothermal reaction is finished, taking out precipitates, cleaning and drying to obtain a precursor; and in an inert or protective atmosphere, controlling the temperature of the precursor to be 400-800 DEG C, and calcining for 2-3 hours to obtain acalcined product, namely the Ni / NiO-C composite material with the porous structure. The prepared Ni / NiO-C composite material has a better electromagnetic wave absorption characteristic, and can be widely applied to the corresponding fields of electromagnetic protection and microwave stealth as an electromagnetic wave absorption material.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, and particularly relates to a porous structure Ni / NiO-C composite material and a preparation method and application thereof. Background technique [0002] Over the past few decades, the rapid development of telecommunications, digital industry and electronic equipment has resulted in excessive electromagnetic radiation. EMI is classified as the pollution of human living space and becomes an important concern of physical health, biological systems, information security and normal operation of electronic equipment. Therefore, some advanced level and efficient electromagnetic wave absorbing materials must be developed to eliminate electromagnetic hazards and electromagnetic interference problems. The efficiency of electromagnetic absorption mainly depends on the inherent electromagnetic properties of microwave absorbing materials. Among countless microwave absorbin...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 郭晓琴赵彪张锐李阳白中义王艳高卡任玉美
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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