Nitrogen-doped graphene/cobalt-zinc ferrite composite aerogel wave-absorbing material and preparation method thereof

A composite airgel and wave-absorbing material technology, which is applied in the field of nitrogen-doped graphene/cobalt-zinc ferrite composite airgel wave-absorbing material and its preparation, can solve the problems of high density, mismatched ferrite impedance, Solve problems such as weak electromagnetic wave absorption ability, achieve the effect of wide frequency band, excellent wave absorption performance, and low filling ratio

Pending Publication Date: 2021-03-02
安徽理工大学环境友好材料与职业健康研究院(芜湖) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Cobalt zinc ferrite (Co 0.5 Zn 0.5 Fe 2 o 4 ) is a magnetic metal oxide with excellent performance, which has good chemical stability, thermal stability, ferromagnetism and other characteristic...

Method used

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  • Nitrogen-doped graphene/cobalt-zinc ferrite composite aerogel wave-absorbing material and preparation method thereof
  • Nitrogen-doped graphene/cobalt-zinc ferrite composite aerogel wave-absorbing material and preparation method thereof
  • Nitrogen-doped graphene/cobalt-zinc ferrite composite aerogel wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Take a 200mL beaker, add 60mL ethylene glycol, and then add 1.08g (4mmol) ferric chloride hexahydrate (FeCl 3 ·6H 2 O), 0.24g (1mmol) cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 0.14g (1mmol) zinc chloride (ZnCl 2 ), stirring vigorously to dissolve it completely, among them, zinc ions (Zn 2+ ), cobalt ions (Co 2+ ) and iron ions (Fe 3+ ) in a molar ratio of 1:1:4, then add a certain amount of 5.4g sodium acetate, stir for 15 minutes until completely dissolved, and add sodium acetate as an electrostatic stabilizer;

[0058] (2) Add quantitatively 1.5g polyethylene glycol (PEG), stir at 50°C for 2h to dissolve to obtain the first mixed dispersion; PEG as a polymer stabilizer must be stirred for 2h at 50°C in a water bath to dissolve, otherwise it will be difficult Dissolve to form a uniform dispersion;

[0059] (3) Transfer the first mixed dispersion to a reaction kettle with a volume of 100mL, and conduct a solvothermal reaction at 200°C for 8 hours to ob...

Embodiment 2

[0071] (1) Take a 200mL beaker, add 60mL ethylene glycol, and then add 1.08g (4mmol) FeCl3 ·6H 2 O, 0.24g (1mmol) CoCl 2 ·6H 2 O and 0.14g (1mmol) ZnCl 2 , stirred vigorously to dissolve completely, among them, Zn 2+ 、Co 2+ and Fe 3+ The molar ratio is 1:1:4, then add a certain amount of 5.4g sodium acetate, stir for 15min until completely dissolved;

[0072] (2) Add a certain amount of 1.5g PEG, stir at 50°C for 2 hours to dissolve it to obtain the first mixed dispersion;

[0073] (3) Transfer the first mixed dispersion liquid to a reaction kettle with a volume of 100mL, and conduct a solvothermal reaction at 200°C for 8 hours to obtain a product containing cobalt-zinc ferrite;

[0074] (4) After the reaction is finished, cool to room temperature, magnetically separate the product to obtain hydrous cobalt-zinc ferrite, wash with deionized water several times to make the pH of the hydrous cobalt-zinc ferrite reach neutral;

[0075] (5) After pre-freezing the hydrated co...

Embodiment 3

[0087] (1) Take a 200mL beaker, add 60mL ethylene glycol, and then add 1.08g (4mmol) FeCl 3 ·6H 2 O, 0.24g (1mmol) CoCl 2 ·6H 2 O and 0.14g (1mmol) ZnCl 2 , stirred vigorously to dissolve completely, among them, Zn 2+ 、Co 2+ and Fe 3+ The molar ratio is 1:1:4, then add a certain amount of 5.4g sodium acetate, stir for 15min until completely dissolved;

[0088] (2) Add a certain amount of 1.5g PEG, stir at 50°C for 2 hours to dissolve it to obtain the first mixed dispersion;

[0089] (3) Transfer the first mixed dispersion liquid to a reaction kettle with a volume of 100mL, and conduct a solvothermal reaction at 200°C for 8 hours to obtain a product containing cobalt-zinc ferrite;

[0090] (4) After the reaction is finished, cool to room temperature, magnetically separate the product to obtain hydrous cobalt-zinc ferrite, wash with deionized water several times to make the pH of the hydrous cobalt-zinc ferrite reach neutral;

[0091] (5) After pre-freezing the hydrated ...

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Abstract

The invention discloses a nitrogen-doped graphene/cobalt-zinc ferrite composite aerogel wave-absorbing material and a preparation method thereof. Firstly, ferric chloride hexahydrate, zinc chloride and cobalt chloride hexahydrate are used as metal sources, ethylene glycol is used as a solvent, cobalt-zinc ferrite particles are prepared through a solvothermal method, then graphene oxide (GO) is used as a template, ethylenediamine is used as a nitrogen-doped reagent, and the nitrogen-doped graphene/cobalt-zinc ferrite composite aerogel material is prepared through a hydrothermal method. The method is simple to operate, green and environment-friendly, and does not generate any toxic substances. The prepared composite aerogel material is high in electromagnetic wave absorption capacity, wide in absorption frequency band, low in filling ratio and small in matching thickness. Electromagnetic waves of different wave bands can be effectively absorbed by adjusting the nitrogen doping amount ofthe composite aerogel and the thickness of a wave absorbing agent, and the composite aerogel 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 relates to a nitrogen-doped graphene / cobalt-zinc ferrite composite airgel wave-absorbing material and a preparation method thereof. Background technique [0002] Due to the widespread use of electronic equipment, electromagnetic wave pollution has caused serious environmental problems, making electromagnetic wave absorbing materials gradually become a research hotspot in the field of functional materials. Electromagnetic wave absorbing material refers to a class of materials that can absorb and attenuate incident electromagnetic waves, convert electromagnetic energy into heat or other forms of energy and dissipate it, or make electromagnetic waves disappear due to interference. Traditional electromagnetic wave absorbing materials, such as ferrite, metal micropowder and silicon carbide, usually have the disadvantages of narrow absorption bandwidth and high density, ...

Claims

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Application Information

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IPC IPC(8): C09K3/00B01J13/00H05K9/00
CPCC09K3/00B01J13/0091H05K9/0081
Inventor 疏瑞文张佳宾唐小龙李宁宁聂丽娟
Owner 安徽理工大学环境友好材料与职业健康研究院(芜湖)
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