Preparation method of three-dimensional reticular MWCNTs/NiFe2O4 (multi-wall carbon nanotube/nickel ferrite) composite wave absorbing material

A technology of multi-walled carbon nanotubes and composite absorbing materials, applied in chemical instruments and methods, magnetic field/electric field shielding, electrical components, etc., can solve the problems of narrow absorption frequency band, limited application, high density, etc., and achieve enhanced attenuation ability, Easy operation and low density effect

Active Publication Date: 2018-11-13
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses two steps for preparation of 3D networks made from materials called WCNNY (wafers containing magnetic nanowires) or nickel iron oxide (nickels). These methods allow for precise manipulation of these components during synthesis while maintaining their original shape. They also have good absorbability even when there're no metal catalyst added. By controllably varying the amount of each component used, it becomes possible to create various types of nanocomposite structures that improve upon existing composites.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the effectiveness of traditional electromagnetism shieldings that absorb radio signals without causing damage caused by radiation emitted from other sources like X rays. Existing methods for creating these types of devices require expensive raw materials containing iron oxides, making it difficult to use flexible plastic films instead of rigid ones due to limited flexibility.

Method used

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  • Preparation method of three-dimensional reticular MWCNTs/NiFe2O4 (multi-wall carbon nanotube/nickel ferrite) composite wave absorbing material
  • Preparation method of three-dimensional reticular MWCNTs/NiFe2O4 (multi-wall carbon nanotube/nickel ferrite) composite wave absorbing material
  • Preparation method of three-dimensional reticular MWCNTs/NiFe2O4 (multi-wall carbon nanotube/nickel ferrite) composite wave 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

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Claims

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Application Information

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Owner ANHUI UNIV OF SCI & TECH
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