Polypyrrole/ferrite/multi-wall carbon nanotube composite material preparation method

A technology of multi-wall carbon nanotubes and composite materials, which is applied in the field of preparation of polypyrrole/ferrite/multi-wall carbon nanotube composite materials, and can solve problems such as poor wave-absorbing performance, small wave-absorbing loss, and low electrical conductivity. problem, to achieve the effect of broadening the microwave absorption frequency band, good microwave absorption performance, and good conductivity

Inactive Publication Date: 2013-02-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the PPy-BaFe prepared in the literature 12 o 19 / Ni 0.8 Zn 0.2 Fe 2 o 4 It has the following disadvantages: the absorbing loss at 8.2-12.4GHz is small (that is, the absorbing performance is not good), this is due to the low electrical conductivity of the composite material, and the electrical loss is small, and by adding 5% carbon nanotubes, its The absorbing loss can reach -25.46dB at 8.9GHz, which better improves its absorbing performance

Method used

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  • Polypyrrole/ferrite/multi-wall carbon nanotube composite material preparation method
  • Polypyrrole/ferrite/multi-wall carbon nanotube composite material preparation method
  • Polypyrrole/ferrite/multi-wall carbon nanotube composite material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) BaFe 12 o 19 -Ni 0.8 Zn 0.2 Fe 2 o 4 Preparation of:

[0020] (a) Dissolve citric acid, iron nitrate, nickel nitrate, zinc nitrate, and barium nitrate with a molar ratio of 217:76:4:1:6 in deionized water, and magnetically stir evenly at room temperature;

[0021] (b) ethylene glycol with a molar ratio of 2 times citric acid is added to the solution, and then the pH is adjusted to 7 with ethylenediamine;

[0022](c) under magnetic stirring, the obtained solution is heated to 75° C., and the water is evaporated until a gel is formed;

[0023] (d) The gel was first dried in an oven at 120 °C for 24 h, then transferred to a muffle furnace at 400 °C for pre-sintering for 3 h, and finally calcined at 1100 °C for 2 h to obtain BaFe 12 o 19 -Ni 0.8 Zn 0.2 Fe 2 o 4 Ferrite powder.

[0024] (2) Treatment of multi-walled carbon nanotubes:

[0025] (a) first calcining the multi-walled carbon nanotubes in a tube furnace at 600°C for 2h;

[0026] (b) Transfer to a...

Embodiment 2

[0035] (1) BaFe 12 o 19 -Ni 0.8 Zn 0.2 Fe 2 o 4 Preparation of:

[0036] (a) Dissolve citric acid, iron nitrate, nickel nitrate, zinc nitrate, and barium nitrate with a molar ratio of 217:76:4:1:6 in deionized water, and magnetically stir evenly at room temperature;

[0037] (b) ethylene glycol with a molar ratio of 2 times citric acid is added to the solution, and then the pH is adjusted to 7 with ethylenediamine;

[0038] (c) under magnetic stirring, the obtained solution is heated to 75° C., and the water is evaporated until a gel is formed;

[0039] (d) The gel was first dried in an oven at 120 °C for 24 h, then transferred to a muffle furnace at 400 °C for pre-sintering for 3 h, and finally calcined at 1100 °C for 2 h to obtain BaFe 12 o 19 -Ni 0.8 Zn 0.2 Fe 2 o 4 Ferrite powder.

[0040] (2) Treatment of multi-walled carbon nanotubes:

[0041] (a) first calcining the multi-walled carbon nanotubes in a tube furnace at 600°C for 2h;

[0042] (b) Transfer to ...

Embodiment 3

[0051] (1) BaFe 12 o 19 -Ni 0.8 Zn 0.2 Fe 2 o 4 Preparation of:

[0052] (a) Dissolve citric acid, iron nitrate, nickel nitrate, zinc nitrate, and barium nitrate with a molar ratio of 217:76:4:1:6 in deionized water, and magnetically stir evenly at room temperature;

[0053] (b) ethylene glycol with a molar ratio of 2 times citric acid is added to the solution, and then the pH is adjusted to 7 with ethylenediamine;

[0054] (c) under magnetic stirring, the obtained solution is heated to 75° C., and the water is evaporated until a gel is formed;

[0055] (d) The gel was first dried in an oven at 120 °C for 24 h, then transferred to a muffle furnace at 400 °C for pre-sintering for 3 h, and finally calcined at 1100 °C for 2 h to obtain BaFe 12 o 19 -Ni 0.8 Zn 0.2 Fe 2 o 4 Ferrite powder.

[0056] (2) Treatment of multi-walled carbon nanotubes:

[0057] (a) first calcining the multi-walled carbon nanotubes in a tube furnace at 600°C for 2h;

[0058] (b) Transfer to ...

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Abstract

The present invention relates to a polypyrrole / ferrite / multi-wall carbon nanotube composite material preparation method, which comprises adopting a sol-gel method to prepare a BaFe12O19-Ni0.8Zn0.2Fe2O4 material, and then adopting an in situ polymerization method to prepare the polypyrrole / ferrite / multi-wall carbon nanotube composite material. According to the prepared polypyrrole / BaFe12O19-Ni0.8Zn0.2Fe2O4 / multi-wall carbon nanotube composite material, polypyrrole, a carrier multi-wall carbon nanotube with characteristics of large specific surface area, good electrical conductivity, good dispersion and stable performance, and a hard magnetic and soft magnetic composite material BaFe12O19-Ni0.8Zn0.2Fe2O are compounded to increase a wave absorption performance of the material, wherein the polypyrrole adopted as the wave absorption material has advantages of low specific gravity, good compatibility and good electrical conductivity; and a chemical oxidation method is adopted to carry out polypyrrole in situ polymerization on the surface of the different amounts of the BaFe12O19-Ni0.8Zn0.2Fe2O4 / multi-wall carbon nanotubes so as to achieve adjustable electromagnetic parameters, such that important significances are provided for widening of composite material microwave absorption frequency bands and preparation of novel wave absorption materials.

Description

technical field [0001] The invention belongs to a preparation method of a ferrite composite wave-absorbing material, in particular to a preparation method of a polypyrrole / ferrite / multi-walled carbon nanotube composite material, specifically a ferrite, conductive high polymer, carbon Nanotube Composite - Polypyrrole / BaFe 12 o 19- Ni 0.8 Zn 0.2 Fe 2 o 4 / Preparation method of multi-walled carbon nanotube composite material. Background technique [0002] Microwave absorbing materials have broad application backgrounds in both commercial and military fields. The key to the field of electromagnetic absorption is to develop new wave-absorbing materials with stable structure, wide frequency band, high absorption rate and low density. Commonly used microwave absorbing materials include ferrite, conductive polymers, carbon nanomaterials, etc. Although ferrite such as ferrite tetroxide, barium ferrite, nickel-zinc ferrite, etc. has high saturation magnetization and magnetic l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/06C08K9/02C08K7/00C08K3/04C08K3/22
Inventor 黄英王岩吴海伟张伟赵阳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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