Metal organic framework derived Co/C nanoparticle coated carbonized cotton fiber wave-absorbing material and preparation method thereof

A metal organic framework, cotton fiber technology, applied in metal processing equipment, transportation and packaging, antennas and other directions, can solve the problems of impedance mismatch, insufficient electromagnetic wave absorption ability, etc., to solve the effect of agglomeration

Active Publication Date: 2020-04-14
HARBIN INST OF TECH
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  • Summary
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of insufficient electromagnetic wave absorption capacity caused by the impedance mismatch of pure carbon-based wave-absorbing materials and the single electromagnetic wave loss mechanism, and provide a carbonized cotton fiber absorber coated with Co / C nanoparticles derived from metal organic frameworks. Wave material and its preparation method

Method used

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  • Metal organic framework derived Co/C nanoparticle coated carbonized cotton fiber wave-absorbing material and preparation method thereof
  • Metal organic framework derived Co/C nanoparticle coated carbonized cotton fiber wave-absorbing material and preparation method thereof
  • Metal organic framework derived Co/C nanoparticle coated carbonized cotton fiber wave-absorbing material and preparation method thereof

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specific Embodiment approach 1

[0025] Specific Embodiment 1: This embodiment describes a carbonized cotton fiber absorbing material coated with Co / C nanoparticles derived from a metal organic framework. The surface of the hollow cotton fiber is uniformly covered by Co / C magnetic nanoparticles with regular dodecahedron microscopic morphology, forming a tubular core-shell structure.

specific Embodiment approach 2

[0026] Embodiment 2: A method for preparing a metal-organic framework-derived Co / C nanoparticle-coated carbonized cotton fiber wave-absorbing material described in Embodiment 1. The steps of the method are:

[0027] Step 1: drying and drying the cotton fiber to remove moisture;

[0028] Step 2: Prepare an anhydrous methanol solution of 2-methylimidazole, soak the dried cotton in step 1 into the above solution, and let it stand for 8-12 hours to ensure full infiltration;

[0029] Step 3: Prepare an anhydrous methanol solution of cobalt nitrate, then pour the anhydrous methanol solution of cobalt nitrate into an anhydrous methanol solution of 2-methylimidazole soaked in cotton fibers, shake evenly, and put The cotton fiber with ZIF-67 metal organic framework on the surface is taken out, washed with alcohol, and dried in an oven to obtain a cotton fiber precursor wrapped with ZIF-67 metal organic framework particles;

[0030] Step 4: Take the cotton fiber precursor wrapped with ...

specific Embodiment approach 3

[0031] Embodiment 3: The preparation method of metal-organic framework-derived Co / C nanoparticles-coated carbonized cotton fiber absorbing material described in Embodiment 2, in step 1, the cotton is natural cotton or industrial absorbent cotton.

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Abstract

The invention relates to a metal organic framework derived Co / C nanoparticle coated carbonized cotton fiber wave-absorbing material and a preparation method thereof and belongs to the technical fieldof electromagnetic wave-absorbing materials. In the method, cotton, 2-methylimidazole and cobalt nitrate are taken as raw materials, through in-situ growth of a cobalt-containing metal organic framework ZIF-67 on a cotton surface in a methanol solution environment, a cotton fiber precursor uniformly coated by ZIF-67 metal organic framework particles is acquired. And then high-temperature thermal carbonization in a protective atmosphere is performed to prepare the metal organic framework derived Co / C nanoparticle coated carbonized cotton fiber wave-absorbing material, wherein a density is 0.0198 g / cm<3>. A 2-18GHz complex dielectric constant and complex permeability are tested by adopting a transmission line method, a reflection loss curve is calculated, an effective absorption frequency band width is 5.6 GHz (12.0-17.6 GHz) when the reflection loss is lower than-10dB under a thickness of 2mm, and maximum absorption strength at 14.3 GH reaches-45.3 dB. The technical problems that a traditional wave-absorbing material is high in density, low in absorption strength and narrow in frequency band are solved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave-absorbing materials, and in particular relates to a carbonized cotton fiber wave-absorbing material coated with Co / C nanoparticles derived from a metal organic framework and a preparation method thereof. Background technique [0002] The rapid development of civil wireless communication technology has brought convenience to life, but it has also caused serious microwave radiation pollution. High stealth performance requirements. Therefore, there is an urgent need to develop high-performance electromagnetic wave absorbing materials with low-cost, light-weight, strong absorption and other performance characteristics. The actual use environment requires ideal electromagnetic wave absorbing materials to have the characteristics of light material density, thin thickness, effective absorption frequency bandwidth, and strong absorption. Carbon materials, especially porous carbon materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B22F1/02B22F1/00H01Q17/00
CPCB22F9/20H01Q17/00B22F1/07B22F1/054B22F1/17
Inventor 李宜彬杨明龙尹维龙
Owner HARBIN INST OF TECH
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