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Preparation method of a three-dimensional network multi-walled carbon nanotube/nickel ferrite composite absorbing material

A technology of multi-walled carbon nanotubes and composite wave absorbing materials, applied in chemical instruments and methods, magnetic/electric field shielding, other chemical processes, etc., can solve the problems of high density, narrow absorption frequency band, limited application, etc. , Enhance attenuation ability, easy operation effect

Active Publication Date: 2021-03-19
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Traditional electromagnetic wave absorbing materials, such as ferrite, metal micropowder and silicon carbide, usually have the disadvantages of narrow absorption frequency band and high density, which limits their practical application

Method used

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  • Preparation method of a three-dimensional network multi-walled carbon nanotube/nickel ferrite composite absorbing material
  • Preparation method of a three-dimensional network multi-walled carbon nanotube/nickel ferrite composite absorbing material
  • Preparation method of a three-dimensional network multi-walled carbon nanotube/nickel ferrite composite absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Take a 100mL beaker, add 30mL ethylene glycol (EG) and 0mg MWCNTs, and sonicate for 30min;

[0030] 2. Add 0.54g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 0.21g nickel chloride hexahydrate (NiCl 2 ·6H 2 O), vigorously stirred for 20min. Among them, Fe 3+ with you 2+ The molar ratio satisfies n Fe3+ :n Ni2+ =2:1;

[0031] 3. Add 2.37g of anhydrous ammonium acetate (NH 4 Ac), vigorously stirred for 30min;

[0032] 4. Pour the mixed dispersion liquid into a 50mL reactor, and react with solvent heat at 200°C for 12 hours;

[0033] 5. After the reaction, cool to room temperature, magnetically separate, and wash with deionized water and absolute ethanol several times to make the pH of the product reach neutral;

[0034] 6. Put it into a vacuum drying oven, dry at 50°C for 24 hours, and grind to obtain the final product, which is recorded as S1.

[0035] The XRD spectrogram of embodiment 1 product sees figure 1 . The powder product and paraffin in Examp...

Embodiment 2

[0037] 1. Take a 100mL beaker, add 30mL ethylene glycol (EG) and 10mg MWCNTs, and sonicate for 30min;

[0038] 2. Add 0.54g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 0.21g nickel chloride hexahydrate (NiCl 2 ·6H 2 O), vigorously stirred for 20min. Among them, Fe 3+ with you 2+ The molar ratio satisfies n Fe3+ :n Ni2+ =2:1;

[0039] 3. Add 2.37g of anhydrous ammonium acetate (NH 4 Ac), vigorously stirred for 30min;

[0040] 4. Pour the mixed dispersion liquid into a 50mL reactor, and react with solvent heat at 200°C for 12 hours;

[0041] 5. After the reaction, cool to room temperature, magnetically separate, and wash with deionized water and absolute ethanol several times to make the pH of the product reach neutral;

[0042] 6. Put it into a vacuum drying oven, dry at 50°C for 24 hours, and grind to obtain the final product, which is recorded as S2.

[0043] The XRD spectrum pattern of embodiment 2 product sees figure 1. The powder product and paraffin in ...

Embodiment 3

[0045] 1. Take a 100mL beaker, add 30mL ethylene glycol (EG) and 20mg MWCNTs, and sonicate for 30min;

[0046] 2. Add 0.54g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 0.21g nickel chloride hexahydrate (NiCl 2 ·6H 2 O), vigorously stirred for 20min. Among them, Fe 3+ with you 2+ The molar ratio satisfies n Fe3+ :n Ni2+ =2:1;

[0047] 3. Add 2.37g of anhydrous ammonium acetate (NH 4 Ac), vigorously stirred for 30min;

[0048] 4. Pour the mixed dispersion liquid into a 50mL reactor, and react with solvent heat at 200°C for 12 hours;

[0049] 5. After the reaction, cool to room temperature, magnetically separate, and wash with deionized water and absolute ethanol several times to make the pH of the product reach neutral;

[0050] 6. Put it into a vacuum drying oven, dry at 50°C for 24 hours, and grind to obtain the final product, which is recorded as S3.

[0051] The XRD spectrum pattern of embodiment 3 product sees figure 1 . The powder product and paraffin in...

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Abstract

The invention discloses a three-dimensional reticular MWCNTs / NiFe2O4 (multi-wall carbon nanotube / nickel ferrite) composite wave absorbing material and a preparation method thereof. The MWCNTs / NiFe2O4composite material with the three-dimensional reticular structure is prepared by using MWCNTs as templates and using ferric chloride hexahydrate and nickel chloride hexahydrate as precursors through one-step solvent thermal reaction. The preparation method achieves the green and environment-friendly effects; no any hazardous side products are generated; the preparation process is simple; the costis low. The prepared binary composite wave absorbing material has the advantages that the electromagnetic wave absorbing capability is high; the absorption frequency band is wide; the thickness is thin; the density is low; the effective absorption on electromagnetic waves of different wave bands can be realized by regulating the content of MWCNTs in the composite material and the coating thickness; important application values are realized 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 multi-walled carbon nanotube-based magnetic composite wave-absorbing material. Background technique [0002] The emergence of electronic products can effectively improve people's quality of life and work efficiency, and play an important role in promoting life and production, but at the same time, the electromagnetic waves generated will also cause certain harm to human health. In the military field, electromagnetic waves also play an important role, such as the application of stealth aircraft and radar. Therefore, electromagnetic wave absorbing materials have important applications in both civil and military fields. [0003] Traditional electromagnetic wave absorbing materials, such as ferrite, metal micropowder and silicon carbide, usually have the disadvantages of narrow absorption frequency band and high densi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 疏瑞文张佳宾吴越孙瑞瑞陈雅南袁佳
Owner ANHUI UNIV OF SCI & TECH