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Magnetoelectric aerogel and preparation method thereof

A composite airgel and gel technology, which is applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems that are difficult to achieve light weight, high efficiency, broadband, etc., achieve good microwave absorption performance, improve Effect of Magnetic Loss Capability, Large Reflection Loss and Absorption Bandwidth

Active Publication Date: 2021-09-21
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, extensive research on microwave absorbers has focused on reducing weight, reducing thickness and expanding Absorption bandwidth, however, a single magnetic loss or dielectric loss material is often difficult to meet the requirements of light weight, high efficiency, and broadband. Therefore, it is necessary to prepare a composite absorber with a synergistic effect of magnetic loss and dielectric loss to solve this problem

Method used

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  • Magnetoelectric aerogel and preparation method thereof
  • Magnetoelectric aerogel and preparation method thereof
  • Magnetoelectric aerogel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] see Figure 1-6 , the present invention provides a technical solution: a magnetic electrogel, the magnetic electrogel includes the following raw material components and the mass percentages of each component in the total amount of wave-absorbing materials are: CoFe 2 o 4 85% for rGO and 85% for rGO.

[0031] The present invention also provides a preparation method of magnetic electrogel, comprising the following steps:

[0032] S1. According to the components and proportions of the solid raw materials, weigh the solid raw materials to mix and dissolve them in water, then fully stir until the solution is clear, and react by heating in a water bath after stirring to obtain an orange precursor solution;

[0033] S2. Centrifuge the orange precursor mixed solution and collect the orange centrifuged product, wash the orange centrifuged product repeatedly with deionized water and ethanol, and then dry the orange centrifuged product to obtain the FeCo-MOF precursor;

[0034]...

Embodiment 2

[0045] (1) Preparation of FeCo-MOF: Weigh 1.0812g of FeCl 3 ·6H 2 O and 1.1641g of Co(NO 3 ) 2 ·6H 2 O add 20mL of deionized water, stir well until the solution is clear;

[0046] Then weigh 0.9288g of fumaric acid powder and add 50mL of deionized water, heat in a water bath at 60°C and stir until the solution is clear;

[0047] Then the above two solutions were fully mixed, transferred to a 100mL polytetrafluoroethylene reactor for hydrothermal reaction, the reaction temperature was 100°C, and the reaction time was 4h;

[0048] The reaction product FeCo-MOF was repeatedly washed with ethanol and deionized water three times before use.

[0049] (2) Preparation of graphene oxide aqueous solution: Weigh 200 mg of graphene oxide powder, place in 40 ml of deionized water, and then sonicate at 20° C. for 2 hours to obtain a brown-yellow graphene oxide aqueous solution (5 mg / ml).

[0050] (3)CoFe 2 o 4 Preparation of / rGO composite airgel: First, take 10 mg of FeCo-MOF in st...

Embodiment 3

[0055] (1) Preparation of FeCo-MOF: Weigh 0.7213g of FeCl 3 ·6H 2 O and 1.5522g of Co(NO 3 ) 2 ·6H 2 O add 20mL of deionized water, stir well until the solution is clear;

[0056] Then weigh 0.9288g of fumaric acid powder and add 50mL of deionized water, heat in a water bath at 60°C and stir until the solution is clear;

[0057] Then the above two solutions were fully mixed, transferred to a 100mL polytetrafluoroethylene reactor for hydrothermal reaction, the reaction temperature was 100°C, and the reaction time was 4h;

[0058] The reaction product FeCo-MOF was repeatedly washed with ethanol and deionized water three times before use.

[0059] (2) Preparation of graphene oxide aqueous solution: Weigh 200 mg of graphene oxide powder, place in 40 ml of deionized water, and then sonicate at 20° C. for 2 hours to obtain a brown-yellow graphene oxide aqueous solution (5 mg / ml).

[0060] (3)CoFe 2 o 4 Preparation of / rGO composite airgel: First, take 10 mg of FeCo-MOF in st...

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Abstract

The invention discloses a magnetoelectric aerogel. The aerogel is prepared from the following raw material components in percentage by mass: 15%-85% of CoFe2O4 and 15%-85% of rGO based on the total mass of a wave-absorbing material. A rod-like FeCo-MOF precursor is synthesized, and is subjected to gelation with graphene oxide, CoFe2O4 / rGO composite aerogel is obtained through heat treatment in the atmosphere of nitrogen, argon or helium, and CoFe2O4 particles are embedded into a three-dimensional framework of reduced graphene oxide, so that the magnetic loss capacity of the material is improved, interface polarization relaxation loss is provided by an interface of the reduced graphene oxide, and the aerogel shows good microwave absorption performance. The prepared aerogel with the magnetic dielectric property has large reflection loss and absorption bandwidth, the preparation method is simple, raw materials are easy to obtain, and repeatability is good.

Description

technical field [0001] The invention relates to the technical field of an aerogel with magnetic and dielectric properties and a preparation method, in particular to a magnetic electrogel and a preparation method. Background technique [0002] With the rapid development of electronic equipment and wireless communication, the problem of electromagnetic interference is also becoming more and more serious. It is urgent to develop high-performance microwave absorbing materials to reduce the harm of electromagnetic wave interference. [0003] In recent years, in terms of practical applications in portable electronic devices, aircraft, and spacecraft, extensive research on microwave absorbers has focused on reducing weight, reducing thickness, and expanding absorption bandwidth, however, a single magnetic loss or dielectric loss material is often very poor. It is difficult to meet the requirements of light weight, high efficiency, and broadband. Therefore, it is necessary to prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 黄啸谷
Owner NANJING UNIV OF INFORMATION SCI & TECH
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