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Magnetoelectric co-loss wave-absorbing agent derived from magnetic metal MOF and preparation method

A technology of magnetic metal and absorbing agent, which is applied in the fields of magnetic field/electric field shielding, electrical components, antennas, etc., can solve the problems of weak absorbing agent loss ability, narrow effective absorption bandwidth, and insufficient process universality, etc., and achieves environmentally friendly particles. Size, excellent absorbing properties, the effect of simplifying the synthesis steps

Active Publication Date: 2021-09-03
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method is simple in process, raw materials that are harmful to human body and pollute the environment are used in the synthesis process, the universality of the process is not high enough, and the prepared absorbent is not strong in loss ability, and the effective absorption bandwidth is narrow

Method used

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  • Magnetoelectric co-loss wave-absorbing agent derived from magnetic metal MOF and preparation method
  • Magnetoelectric co-loss wave-absorbing agent derived from magnetic metal MOF and preparation method
  • Magnetoelectric co-loss wave-absorbing agent derived from magnetic metal MOF and preparation method

Examples

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Effect test

Embodiment 1

[0025] A magnetoelectric co-loss electromagnetic wave absorber derived from a magnetic metal MOF and a preparation method thereof, comprising the following steps:

[0026] Step 1, weigh 2.1624g FeCl 3 ·6H 2 Dissolve O in 20mL of deionized water, weigh 0.9287g of fumaric acid and dissolve in 50mL of deionized water, stir the two solutions until they are clear and transparent, then mix them, then slowly add 2mL of graphene oxide aqueous solution to the above solution And fully stirred for 30min to obtain a mixed solution for subsequent use;

[0027] Step 2, transfer the mixed solution obtained in step 1 to the reaction kettle, then place it in a 100°C oven for hydrothermal reaction for 4 hours, collect the product after the reaction is completed, and wash the product repeatedly with ethanol and deionized water for 3 times, and finally Dry in a vacuum oven at 60°C for 24 hours to obtain a composite precursor of Fe MOF and rGO;

[0028] Step 3, place the dried powder in step 2 ...

Embodiment 2

[0030] A magnetoelectric co-loss electromagnetic wave absorber derived from a magnetic metal MOF and a preparation method thereof, comprising the following steps:

[0031] Step 1, weigh 0.1819g Co(NO 3 ) 2 ·6H 2 Dissolve O in 20mL methanol, weigh 0.8210g 2-methylimidazole and dissolve in 50mL methanol, stir the two solutions until they are clear and transparent, then mix them, then slowly add 4mL graphene oxide aqueous solution into the above solution and stir for 30min , to obtain a mixed solution for subsequent use;

[0032] Step 2, transfer the mixed solution obtained in step 1 to a beaker, and then place it at room temperature (25°C) to react for 24 hours, collect the product after the reaction is completed, and wash the product with methanol for 3 times, and finally dry it in vacuum at 60°C Dry in the oven for 24 hours to obtain the composite precursor of Co MOF and rGO;

[0033]Step 3, place the dried powder in step 2 in a crucible, conduct a heat treatment at 900°C ...

Embodiment 3

[0035] A magnetoelectric co-loss electromagnetic wave absorber derived from a magnetic metal MOF and a preparation method thereof, comprising the following steps:

[0036] Step 1, weigh 0.3635g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 20mL of deionized water, and 0.2077g of terephthalic acid was weighed and dissolved in 50mL of deionized water. After the two solutions were stirred until they were clear and transparent, they were mixed, and then 6mL of graphene oxide aqueous solution was slowly added to the above solution and mixed. Fully stir for 30 minutes to obtain a mixed solution for subsequent use;

[0037] Step 2, transfer the mixed solution obtained in step 1 to the reaction kettle, and then place it in a 100°C oven for hydrothermal reaction for 4h, collect the product after the reaction is completed, and wash the product repeatedly with deionized water for 5 times, and finally put it in a 60°C oven ℃ in a vacuum drying oven for 24 hours to obtain the composite precursor...

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Abstract

The invention relates to a magnetoelectric co-loss wave-absorbing agent derived from magnetic metal MOF and a preparation method. The magnetoelectric co-loss wave-absorbing agent is a composite material of a metal oxide derived from magnetic metal MOF and reduced graphene oxide, and is prepared by the following steps: mixing a metal salt with an organic complex, adding a graphene oxide aqueous solution, transferring the mixture into a container, performing reacting to obtain a compound of a precursor mono (bis, tri) metal MOF and rGO, carrying out heat treatment in a tubular furnace under the protection of gas, performing collecting, mixing with paraffin according to a ratio to prepare an annular piece, and finally determining the electromagnetic wave absorption performance of the sample. According to the method, the microstructure of a substance is possibly changed, the effective absorption bandwidth of the material is widened, and the material has higher reflection loss under the condition of lower thickness. The prepared composite wave-absorbing agent is uniform in particle size, complete in morphology and good in crystallinity.

Description

technical field [0001] The invention relates to the field of electromagnetic wave absorbing materials, in particular to a magnetoelectric co-loss wave absorber derived from magnetic metal MOF and a preparation method thereof. Background technique [0002] With the rapid development of communication technology and the continuous increase of electromagnetic radiation, the demand for high-performance electromagnetic wave absorbers is increasing. Among them, magnetic / dielectric composite materials have attracted widespread attention because of their excellent dielectric loss and magnetic loss. . Reduced graphene oxide (rGO) is widely used as a matrix material for composite absorbents due to its good electrical and thermal conductivity and thermal stability. However, if magnetic particles and RGO are simply compounded together, agglomeration of magnetic particles and RGO will inevitably occur. Metal-organic framework (MOF) materials can solve this problem very well. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H01Q17/00
CPCH05K9/0081H01Q17/00H01Q17/004
Inventor 黄啸谷马亚斌权斌邵高峰郭腾超
Owner NANJING UNIV OF INFORMATION SCI & TECH
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