Preparation method of bimetallic organic framework derived magnetic carbon composite wave-absorbing material

A technology of composite absorbing materials and organic frameworks, applied in chemical instruments and methods, other chemical processes, etc., to achieve the effects of easy regulation of absorption performance, high absorption intensity, and optimized impedance matching

Pending Publication Date: 2021-06-18
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on iron-based bimetallic MOFs-derived magnetic-carbon composite absorbers.

Method used

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  • Preparation method of bimetallic organic framework derived magnetic carbon composite wave-absorbing material
  • Preparation method of bimetallic organic framework derived magnetic carbon composite wave-absorbing material
  • Preparation method of bimetallic organic framework derived magnetic carbon composite wave-absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Take a 150mL beaker, add 80mL DMF, add 80mg graphite oxide while stirring, and stir for 0.5h after ultrasonication for 1.5h to make a GO dispersion with a concentration of 1mg / mL;

[0046] (2) Add 1.989g FeCl to the GO dispersion obtained above 3 ·6H 2 O stir vigorously until completely dissolved;

[0047] (3) Add 1.2227g H to the mixed dispersion obtained above 2 BDC was stirred vigorously until it was completely dissolved, and finally stirred vigorously for 0.5h;

[0048] (4) Transfer the mixed dispersion liquid to a polytetrafluoroethylene-lined autoclave with a volume of 100 mL, and conduct a solvothermal reaction at 110° C. for 24 h;

[0049] (5) After the reaction is finished, cool to room temperature, repeatedly use DMF and absolute ethanol to centrifuge and wash several times, and collect the precipitate;

[0050] (6) The precipitate after washing is transferred to a vacuum freeze dryer, and dried for 24 hours to constant weight;

[0051](7) Perform hig...

Embodiment 2

[0054] (1) Take a 150mL beaker, add 80mL DMF, add 80mg graphite oxide while stirring, and stir for 0.5h after ultrasonication for 1.5h to make a GO dispersion with a concentration of 1mg / mL;

[0055] (2) Add 1.3271g FeCl to the GO dispersion obtained above 3 ·6H 2 O and 0.3339g ZnCl 2 Stir vigorously until completely dissolved;

[0056] (3) Add 1.2227g H to the mixed dispersion obtained above 2 BDC was stirred vigorously until it was completely dissolved, and finally stirred vigorously for 0.5h;

[0057] (4) Transfer the mixed dispersion liquid to a polytetrafluoroethylene-lined autoclave with a volume of 100 mL, and conduct a solvothermal reaction at 110° C. for 24 h;

[0058] (5) After the reaction is finished, cool to room temperature, repeatedly use DMF and absolute ethanol to centrifuge and wash several times, and collect the precipitate;

[0059] (6) The precipitate after washing is transferred to a vacuum freeze dryer, and dried for 24 hours to constant weight;

...

Embodiment 3

[0063] (1) Take a 150mL beaker, add 80mL DMF, add 80mg graphite oxide while stirring, and stir for 0.5h after ultrasonication for 1.5h to make a GO dispersion with a concentration of 1mg / mL;

[0064] (2) Add 0.9947g FeCl to the GO dispersion obtained above 3 ·6H 2 O and 0.5016g ZnCl 2 Stir vigorously until completely dissolved;

[0065] (3) Add 1.2227g H to the mixed dispersion obtained above 2 BDC was stirred vigorously until it was completely dissolved, and finally stirred vigorously for 0.5h;

[0066] (4) Transfer the mixed dispersion liquid to a polytetrafluoroethylene-lined autoclave with a volume of 100 mL, and conduct a solvothermal reaction at 110° C. for 24 h;

[0067] (5) After the reaction is finished, cool to room temperature, repeatedly use DMF and absolute ethanol to centrifuge and wash several times, and collect the precipitate;

[0068] (6) The precipitate after washing is transferred to a vacuum freeze dryer, and dried for 24 hours to constant weight;

...

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Abstract

The invention discloses a bimetallic organic framework (MOFs) derived magnetic carbon composite wave-absorbing material and a preparation method thereof. Graphene oxide is used as a template, ferric chloride hexahydrate and zinc chloride are used as a metal salt precursor, terephthalic acid is used as an organic ligand, N, N-dimethylformamide is used as a solvent, and the iron-based bimetallic MOFs derived magnetic carbon composite wave-absorbing material is prepared through a solvothermal and high-temperature pyrolysis two-step method. The preparation method is green and environment-friendly, no toxic and harmful by-products are generated, and the preparation process is simple. According to the prepared composite material, the morphology of a carbon frame is gradually changed from a conventional regular octahedron to a pomegranate shape by simply changing the molar ratio of iron salt to zinc salt in the precursor, meanwhile, strong absorption and wide bandwidth can be realized by changing the matching thickness, and effective absorption almost completely covers a Ku wave band, and the material has important application value in the fields of electromagnetic absorption and electromagnetic shielding.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic composite materials, and in particular relates to a preparation method of a magnetic-carbon composite wave-absorbing material derived from a bimetallic organic framework. [0002] technical background [0003] Since the beginning of the 21st century, scientific and technological progress has led to rapid changes in human lifestyles, especially the rapid development and wide application of various electronic and electrical equipment, making human production efficiency higher and higher, and life experience more convenient and comfortable. However, the increasingly widespread application of electronic and electrical equipment has also brought potential hazards, and the electromagnetic radiation and interference they produce also imperceptibly lead to the destruction of human production and living environments. In addition, with the changes in the international strategic environment, stealth t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 疏瑞文李晓慧吴越李宁宁
Owner ANHUI UNIV OF SCI & TECH
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