Preparation method and application of tremella derived carbon-based magnetic particle loaded wave-absorbing material

A technology of magnetic particles and wave absorbing materials, which is applied in the field of preparation of electromagnetic wave absorbing materials for obtaining tremella-derived carbon-based loaded magnetic substances, can solve the problems of uneven distribution of loaded particles, complicated preparation process, environmental and human hazards, etc. Utilization value, simple process, and the effect of improving the absorbing performance

Inactive Publication Date: 2021-07-02
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the composite material combined with the two has the advantages of low thickness and light weight, but most of its preparation process is relatively complicated, and the by-products in it will cause harm to the environment and human body, and the particle distribution of the obtained composite material is not uniform. , it is easy to accumulate and form a "dead area"

Method used

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  • Preparation method and application of tremella derived carbon-based magnetic particle loaded wave-absorbing material
  • Preparation method and application of tremella derived carbon-based magnetic particle loaded wave-absorbing material
  • Preparation method and application of tremella derived carbon-based magnetic particle loaded wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of tremella-derived carbon-based magnetic particle-loaded wave-absorbing material, comprising the steps of:

[0025] Step 1, weigh 4g white fungus and 2mol / L Fe(NO 3 ) 3 9H 2 O solution, swelling and foaming;

[0026] Step 2, freeze-drying the foamed product obtained in step 1;

[0027] In step 3, the freeze-dried product obtained in step 2 is placed in a tube furnace under a nitrogen environment and heated to 600 degrees, and kept for 1 hour;

[0028] Step 4, after the tube furnace is cooled to room temperature, the porous carbon base can be loaded with Fe 3 o 4 Electromagnetic absorbing material for magnetic substances.

Embodiment 2

[0030] A preparation method of tremella-derived carbon-based magnetic particle-loaded wave-absorbing material, comprising the steps of:

[0031] Step 1, weigh 4g white fungus and 6mol / L Fe(NO 3 ) 3 9H 2 O solution, swelling and foaming;

[0032] Step 2, freeze-drying the foamed product obtained in step 1;

[0033] In step 3, the freeze-dried product obtained in step 2 is placed in a tube furnace under a nitrogen environment and heated to 600 degrees, and kept for 1 hour;

[0034] Step 4, after the tube furnace is cooled to room temperature, the porous carbon base can be loaded with Fe 3 o 4 Electromagnetic absorbing material for magnetic substances.

Embodiment 3

[0036] A preparation method of tremella-derived carbon-based magnetic particle-loaded wave-absorbing material, comprising the steps of:

[0037] Step 1, weigh 4g white fungus and 4mol / L Fe(NO 3 ) 3 9H 2 O solution, swelling and foaming;

[0038] Step 2, freeze-drying the foamed product obtained in step 1;

[0039] Step 3, the freeze-dried product obtained in step 2 is placed in a tube furnace under an argon atmosphere and heated to 700 degrees, and kept for 1 hour;

[0040] Step 4, after the tube furnace is cooled to room temperature, the porous carbon base can support Fe 3 C electromagnetic absorbing material of magnetic substance.

[0041] figure 1 (a), (b), and (c) are the X-ray diffraction patterns of Case 1, Case 2, and Case 3 respectively; it can be seen that Case 1 is porous carbon-based loaded Fe 3 o 4absorbing material; Case 2 is a porous carbon-based loaded Fe 3 o 4 absorbing material; Case 3 is a porous carbon-based loaded Fe 3 C absorbing material.

[0...

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PUM

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Abstract

The invention discloses a preparation method and application of a tremella derived carbon-based magnetic particle loaded wave-absorbing material. Tremella is taken as a raw material of the wave-absorbing material, magnetic particles are absorbed by swelling foaming to enter the inside of the tremella, the tremella derived carbon-based magnetic particle loaded wave-absorbing material is prepared through freeze drying and one-step carbonization, and a simple, green and low-cost preparation method is provided. By simply controlling the concentration of metal ions, the regulation and control of microstructures such as a pore structure and a layered structure can be realized, and meanwhile, the coexistence of magnetic loss and dielectric loss of the material is realized. By using a freeze-drying technology, the inherent hierarchical structure and nanopore structure of tremella can be reserved, and metal ions are fixed at initial positions, so that the absorption performance of the tremella derived wave-absorbing material can be improved. The special structure endows the wave-absorbing material with the characteristics of small thickness, light weight and strong absorbing capacity.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic absorption and shielding, relates to swelling and absorbing magnetic particles entering the interior of tremella to affect electromagnetic properties, and in particular to a preparation method and application of an electromagnetic wave-absorbing material obtained from tremella-derived carbon-based loaded magnetic substances. Background technique [0002] The rapid development of electronic technology has brought great convenience to human life. However, excessive use of electronic equipment will cause serious electromagnetic wave pollution, such as electromagnetic radiation and electromagnetic interference, which is harmful to human health and the operation of precision equipment. In order to reduce and solve these problems, electromagnetic absorbing materials are manufactured to dissipate electromagnetic waves. Electromagnetic absorbing materials generally require wide absorption frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08C01B32/914C01B32/05H01Q17/00H05K9/00
CPCC01G49/08C01B32/914C01B32/05H01Q17/00H05K9/0081C01P2002/72C01P2002/82C01P2004/03C01P2004/80
Inventor 王益群任良贵何永超何秦川
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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