Carbon/magnetic electromagnetic wave absorbing material with sandwich structure and preparation method thereof

A technology for absorbing materials and electromagnetic waves, applied in the fields of magnetic/electric field shielding, electrical components, etc., can solve the problems of heavy weight, difficult molding, single electromagnetic wave loss mechanism, etc., achieve light weight, magnetic loss performance, and improve electromagnetic wave absorption performance Effect

Pending Publication Date: 2021-11-02
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems of heavy product quality, difficult molding, and single electromagnetic wave loss mechanism in the prior art, the present invention prepares a carbon / magnetic electromagnetic wave absorbing material with a sandwich structure, which forms a carbon layer, a magnetic Layers and other multi-layered micro-flaky particles can effectively absorb electromagnetic waves and have very broad application prospects

Method used

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  • Carbon/magnetic electromagnetic wave absorbing material with sandwich structure and preparation method thereof
  • Carbon/magnetic electromagnetic wave absorbing material with sandwich structure and preparation method thereof
  • Carbon/magnetic electromagnetic wave absorbing material with sandwich structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Dissolve 2g of anhydrous ferric chloride into 20ml of diethylene glycol to prepare a metal salt solution;

[0020] (2) Add 2g of citric acid-sodium citrate buffer (pH=10) to the solution in step 1, stir to dissolve and let stand for 5 minutes to prepare the solution;

[0021] (3) Transfer the solution prepared in step 2 to a Teflon-lined stainless steel autoclave and keep it at 200°C for 8 hours. Vibrate once in 30 minutes to prevent the agglomeration of particles; then take it out and wash it with deionized water and dry it to obtain flake ferric oxide;

[0022] (4) Prepare 1g / L dopamine hydrochloride, and use citric acid-sodium citrate buffer to adjust the pH of the solution to 8.5;

[0023] (5) Put 5g of flaky iron ferric oxide into 50ml of the solution prepared in step 4, and then shake and react in a water bath at 30°C for 10 hours to obtain a flaky material coated with polydopamine. The thickness of polydopamine is 5nm;

[0024] (6) Place the material prepar...

Embodiment 2

[0028] (1) Dissolve 10g of anhydrous ferric chloride into 80ml of diethylene glycol to prepare a metal salt solution;

[0029] (2) Add 5g of citric acid-sodium citrate buffer (pH=10) into the solution in step 1, stir to dissolve and let stand for 5 minutes to prepare the solution;

[0030] (3) Transfer the solution prepared in step 2 to a Teflon-lined stainless steel autoclave and keep it at 200°C for 8 hours. Vibrate once in 30 minutes to prevent the agglomeration of particles; then take it out and wash it with deionized water and dry it to obtain flake ferric oxide;

[0031] (4) Prepare 2g / L dopamine hydrochloride, and adjust the pH of the solution to 8.5 with citric acid-sodium citrate buffer;

[0032] (5) Put 10g of flaky iron ferric oxide into 80ml of the solution prepared in step 4, and then shake and react in a water bath at 30°C for 24 hours to obtain a sheet-like material coated with polydopamine. The thickness of polydopamine is 10nm;

[0033] (6) Place the materia...

Embodiment 3

[0037] (1) Dissolve 10g of anhydrous ferric chloride into 80ml of diethylene glycol to prepare a metal salt solution;

[0038] (2) Add 5 g of citric acid-sodium citrate buffer (pH=10) to the solution in step 1, stir to dissolve and let stand for 5 minutes to prepare the solution;

[0039] (3) Transfer the solution prepared in step 2 to a Teflon-lined stainless steel autoclave and keep it at 200°C for 8 hours. Vibrate once in 30 minutes to prevent the agglomeration of particles; then take it out and wash it with deionized water and dry it to obtain flake ferric oxide;

[0040] (4) Prepare 2g / L dopamine hydrochloride, and adjust the pH of the solution to 8.5 with citric acid-sodium citrate buffer;

[0041] (5) Put 10g of flaky iron ferric oxide into 80ml of the solution prepared in step 4, and then shake and react in a water bath at 30°C for 24 hours to obtain a sheet-like material coated with polydopamine. The thickness of polydopamine is 10nm;

[0042] (6) Place the material...

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Abstract

The invention discloses a carbon / magnetic electromagnetic wave absorbing material with a sandwich structure and a preparation method thereof. The preparation method comprises the following steps of preparing flaky ferroferric oxide by using ferric salt, coating polydopamine with 5-10 g of flaky ferroferric oxide to obtain a flaky material, putting the flaky material coated with the polydopamine into a nitrogen atmosphere of 450-600 DEG C for carbonization treatment for 1 hour to obtain a material, adding the material into 100 ml of distilled water, then adding 5 g of a mixture of ferric chloride and ferrous chloride in a molar ratio of 2: 1, stirring and dissolving, gradually dropwise adding 8 ml of ammonia water, and reacting in a water bath at 50 DEG C for 1 hour, and washing. According to the carbon / magnetic electromagnetic wave absorbing material with a sandwich structure, ferroferric oxide serves as an inner layer, a middle layer is a carbon layer, and nanometer ferroferric oxide particles serve as an outermost layer, so that the electromagnetic wave absorbing performance of the material can be obviously improved, and the material has the dielectric loss performance and the magnetic loss performance, is light in weight and has very wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic materials, and in particular relates to a carbon / magnetic electromagnetic wave absorbing material with a sandwich structure and a preparation method thereof. Background technique [0002] With the rapid development of electronics and electrical technology, the scope of electromagnetic energy utilization continues to expand, followed by electromagnetic radiation pollution. Electromagnetic pollution has become the fifth largest public hazard after wastewater, waste gas, solid waste and noise. Relevant reports indicate that electromagnetic pollution will replace noise pollution in this century and become one of the five major physical pollutions. At present, using electromagnetic wave absorbing materials to weaken or eliminate electromagnetic wave pollution is an effective method. [0003] At present, ferrite or carbon materials are commonly used as electromagnetic wave absorbing materials i...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0088
Inventor 叶伟张杏孙启龙龙啸云高强季涛
Owner NANTONG UNIVERSITY
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