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a co/zro 2 /c Electromagnetic wave absorbing material and its preparation method and application

A technology for absorbing materials and electromagnetic waves, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of inability to provide electrical and magnetic losses, difficult to obtain electromagnetic wave absorption performance, and difficult to achieve broadband absorption, etc., to achieve beneficial electromagnetic waves. The effect of absorption performance, excellent impedance matching performance, and low production cost

Active Publication Date: 2020-07-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For wave-absorbing materials, it is difficult for a single absorber to achieve broadband absorption. As a dielectric material, zirconia cannot provide appropriate electrical loss and magnetic loss, and according to the impedance matching condition, a single It is difficult for zirconium dioxide to meet the impedance matching conditions, and it is difficult to obtain excellent electromagnetic wave absorption performance, which also limits its further development and application.
[0005] In the prior art, two kinds of metal-carbon composite absorbing materials have also been prepared, but they still have the problems of poor absorbing performance and easy collapse of carbon materials.

Method used

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  • a co/zro <sub>2</sub> /c Electromagnetic wave absorbing material and its preparation method and application
  • a co/zro <sub>2</sub> /c Electromagnetic wave absorbing material and its preparation method and application
  • a co/zro <sub>2</sub> /c Electromagnetic wave absorbing material and its preparation method and application

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preparation example Construction

[0051] Again, the present invention discloses a Co / ZrO 2 The preparation method of / C electromagnetic wave absorbing material comprises the steps:

[0052] (1) Mix zirconium source, organic ligand and acetic acid evenly in an organic solvent, and react at 100-400°C for 2-30 hours under airtight conditions. After the reaction is completed, the product is washed and dried to obtain MOF, and then The MOF is dispersed into the cobalt source solution to obtain a composite of MOF.

[0053] (2) Calcining the compound obtained in step (1) under a protective atmosphere, reducing the cobalt ions in the cobalt source to simple cobalt, and decomposing the MOF into ZrO 2 and carbon, that is, Co / ZrO 2 / C.

[0054] As a further technical solution, in step (1), the cobalt source includes any one of cobalt nitrate, cobalt chloride and cobalt sulfate.

[0055] As a further technical solution, in step (1), the zirconium source includes any one of zirconium tetrachloride and zirconium oxychlor...

Embodiment 1

[0067] A Co / ZrO 2 The preparation method of / C electromagnetic wave absorbing material comprises the steps:

[0068] (1) Add 5mL of acetic acid into 100mL of DMF, then dissolve 2.5mmol of zirconium tetrachloride and 2.5mmol of terephthalic acid in the above solution, and obtain a homogeneous transparent solution after vigorous stirring. After completion, the product is washed and dried to obtain a MOF precursor.

[0069] (2) Put the above precursor in 2mol / L cobalt nitrate solution, vacuum treatment (relative vacuum degree is -0.1MPa) for 30min, put it in the natural environment for 24h, then wash and dry to obtain the composite cobalt source MOF precursors.

[0070] (3) Put the MOF precursor treated in step (2) in a closed tube furnace, and in a nitrogen atmosphere, keep it at 700°C for 2h for high-temperature calcination to obtain Co / ZrO 2 / C Electromagnetic wave absorbing material.

Embodiment 2

[0072] A Co / ZrO 2 The preparation method of / C electromagnetic wave absorbing material comprises the steps:

[0073] (1) Add 8mL of acetic acid to 100mL of DMF, then dissolve 3mmol of zirconium oxychloride and 2mmol of amino-terephthalic acid in the above solution, and obtain a homogeneous transparent solution after vigorous stirring, and keep it in a closed space at 300°C for 15h, and the reaction is complete Afterwards, the product is washed and dried to obtain a MOF precursor.

[0074] (2) Put the above precursor in 2.5mol / L cobalt chloride solution, vacuum treatment (relative vacuum degree is -0.1MPa) for 40min, then place it in the natural environment for 20h, then wash and dry to obtain composite cobalt The MOF precursor after the source.

[0075] (3) Put the MOF precursor treated in step (2) in a closed tube furnace, and in a nitrogen atmosphere, keep it at 650°C for 3h for high-temperature calcination to obtain Co / ZrO 2 / C Electromagnetic wave absorbing material.

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Abstract

The invention relates to a Co-modified metal organic framework-derived ZrO2 / C electromagnetic wave absorbing material, and a preparation method and an application thereof. The electromagnetic wave absorbing material is of a three-dimensional network structure formed by interweaving one-dimensional fibers. The fiber is composed of a carbonaceous matrix, ZrO2 and Co nanoparticles. The Co nanoparticles are embedded in the surface of the carbonaceous matrix uniformly distributed by ZrO2. The method comprises the steps that 1, a cobalt source, a zirconium source, an anhydrous acetic acid organic ligand and DMF are processed into a solvothermal solution, the organic ligand containing a carbon source, an MOF precursor is obtained after solvothermal reaction, the MOF precursor is washed and dried,then the MOF precursor is treated with the cobalt source, and cobalt source composite MOF is obtained; and (2) the compounded MOF precursor is placed in a protective atmosphere to convert cobalt ionsin a cobalt source into elemental cobalt, a zirconium source into ZrO2 and an organic ligand into a carbon matrix, thereby obtaining the catalyst. According to the preparation method disclosed by theinvention, ZrO2, Co and C are effectively subjected to nanoscale compounding, so that the prepared material has excellent performance.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorbing materials, in particular to a Co / ZrO 2 / C Electromagnetic wave absorbing materials and their preparation methods and applications. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the rapid development of communication technology and electronic products, electromagnetic pollution continues to intensify, and human health will also be damaged. Studies have shown that excessive electromagnetic radiation can cause various nervous system disorders. In the military, as modern warfare moves towards informationization, the possibility of military defense systems and aircraft being det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 刘久荣刘伟张雪王凤龙汪宙吴莉莉
Owner SHANDONG UNIV
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