A kind of preparation method of iron/nitrogen/carbon composite material

A carbon composite material, ferric nitrate technology, applied in carbon preparation/purification, magnetic field/electric field shielding, electrical components, etc., can solve the problems of difficult commercial application, limited wave absorption performance, high material density, and improve microwave The effect of absorption strength, low cost, and large specific surface area

Active Publication Date: 2021-08-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the iron-nitrogen-carbon composite materials synthesized by the above methods have achieved high microwave absorption performance, the raw materials used in their synthesis are toxic, the cost is high, and the process is complicated, so it is difficult to achieve commercial application.
In addition, the iron element in the above synthesis process exists in the form of nanoparticles, which will lead to high density and increased quality of the material, which further limits the improvement of microwave absorption performance.

Method used

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  • A kind of preparation method of iron/nitrogen/carbon composite material
  • A kind of preparation method of iron/nitrogen/carbon composite material
  • A kind of preparation method of iron/nitrogen/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Disperse silica balls, agar, urea, and ferric nitrate nine water with a mass ratio of 1:2:12:1.5 in 40 parts of deionized water, then ultrasonicate the mixed solution for 10 minutes to disperse the solute evenly, and then The solution was heated and stirred at 100°C for 50 minutes until the generation of bubbles stopped;

[0023] (2) The mixed solution in (1) was left to stand at room temperature for 4 hours, and it was cooled to form a gel; the formed gel block was quickly frozen with liquid nitrogen, placed in a freeze dryer, and lyophilized for 24 hours, Finally, a dry block is formed;

[0024] (3) Move the freeze-dried block in (2) to a crucible, place it in a tube furnace, and perform high-temperature sintering at 900°C for 4 hours under an argon atmosphere, and then sinter the sintered material with hydrogen fluorine Acid corrosion for 12h;

[0025] (4) The corroded product was washed several times with ethanol and deionized water, then dried at 60° C., and ...

Embodiment 2

[0029] Disperse silica balls, agar, urea, and ferric nitrate nine water with a mass ratio of 1:2:12:1 in 40 parts of deionized water, and the rest are the same as in Example 1.

[0030] The prepared material was used to prepare the absorbing sample, and the measured maximum reflection loss value was -40.6dB, the effective bandwidth was 4.1GHz, the material filling mass was only 10%, and the thickness was 2.5mm.

Embodiment 3

[0032] The raw materials and preparation process of this embodiment are the same as those in Example 1, except that the amount of ferric nitrate nine water is 3 parts.

[0033] The prepared material is used to prepare the absorbing sample, and the measured maximum reflection loss value is -55.4dB, the effective bandwidth is 4.8GHz, the material filling mass is only 20%, and the thickness is 1.65mm.

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Abstract

The invention belongs to the field of new materials, and relates to a preparation method of a hierarchically porous monoatomic dispersed iron / nitrogen / carbon composite material. It is characterized in that silica balls, agar, urea, and ferric nitrate are first dispersed in deionized water, and then the mixed solution is stirred under heating until the generation of bubbles stops; then the mixed solution is left at room temperature to form a coagulated Gel; freeze-dry the formed gel block to form a dry block, and move it to a crucible for high-temperature sintering under a protective atmosphere; corrode the sintered material with acid; finally clean and dry it with a cleaning agent , Grinding, and separating the target product iron / nitrogen / carbon composite material. The invention has simple process, low cost, and is convenient for batch production. The prepared iron / nitrogen / carbon composite material presents a hierarchical porous structure and single atom dispersion, and is used in the field of microwave absorption. It has the advantages of thin absorption thickness, light material, effective absorption frequency bandwidth and Advantages of strong absorption strength.

Description

technical field [0001] The invention belongs to the field of new materials, and relates to a preparation method of a hierarchically porous monoatomic dispersed iron / nitrogen / carbon composite material. Background technique [0002] In recent years, with the rapid development of various electronic devices and wireless communications in civilian, commercial and military fields, the problem of electromagnetic wave pollution has become more and more serious. This not only affects the normal work of various electronic devices, but also seriously endangers human life and health. Therefore, the development of absorbing materials has been paid more and more attention. High-efficiency absorbing materials need to meet the characteristics of "thin, light, wide, and strong", that is, the absorption thickness is thin, the material is light, the effective absorption frequency band is wide, and the absorption strength is strong. [0003] According to the absorbing mechanism, the currently...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00B22F9/18B22F9/04C01B32/05
CPCB22F9/04B22F9/18C01P2004/03C01P2006/17C01B32/05H05K9/0081
Inventor 张希华张鹏翔李斌
Owner SHANDONG UNIV
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