Ternary composite wave-absorbing material with core-shell structure and preparation method thereof

A ternary composite and wave-absorbing material technology, applied in shielding materials, chemical instruments and methods, nanotechnology for materials and surface science, etc., to achieve excellent microwave absorption performance, high effective wave-absorbing frequency bandwidth, and good impedance matching The effect of the attenuation characteristic

Active Publication Date: 2022-02-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CoFe 2 o 4 / CNFs-based composite system has a high absorbing frequency band, how to make the absorbing material have excellent absorbing performance at low frequencies, and a wider absorbing frequency band is the pursuit of absorbing materials

Method used

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  • Ternary composite wave-absorbing material with core-shell structure and preparation method thereof
  • Ternary composite wave-absorbing material with core-shell structure and preparation method thereof
  • Ternary composite wave-absorbing material with core-shell structure and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A spherical ternary composite absorbing material with a core-shell structure, according to CoFe 2 o 4 with NiFe 2 o 4 The mass ratio of 3:1 requires the design of the composite absorbing material, and the specific preparation method comprises the following steps:

[0041] 1) Preparation of acidified carbon nanofibers

[0042] First measure 60mL mixed acid (concentration is 98% concentrated sulfuric acid concentration is 95% and concentrated nitric acid is mixed with the volume ratio of 3:1) is placed in beaker, then adds 1.0g carbon nanofiber, moves in the 100ml there-necked flask, transfers Stir magnetically in an oil bath at 80°C, carry out condensation and reflux treatment, and the acidification process lasts for 6 hours; ℃ in a vacuum oven for 12 hours to obtain acidified carbon nanofibers, which are denoted as O-CNFs;

[0043] 2) Preparation of CoFe by solvothermal method 2 o 4

[0044] Take 50ml of ethylene glycol (EG) and place it in a 100ml beaker, add 0...

Embodiment 2

[0053] A spherical ternary composite absorbing material with a core-shell structure, according to CoFe 2 o 4 with NiFe 2 o 4 The mass ratio of 1:1 requires the design of the composite absorbing material, and the specific preparation method comprises the following steps:

[0054] 1) Preparation of acidified carbon nanofibers

[0055] First measure 60mL mixed acid (concentration is 98% concentrated sulfuric acid concentration is 95% and concentrated nitric acid is mixed with the volume ratio of 3:1) is placed in beaker, then adds 1.0g carbon nanofiber, moves in the 100ml there-necked flask, transfers Stir magnetically in an oil bath at 80°C for condensation and reflux treatment. The acidification process lasts for 6 hours; Dry in a vacuum oven at 60°C for 12 hours to obtain acidified carbon nanofibers, which are denoted as O-CNFs;

[0056] 2) Preparation of CoFe by solvothermal method 2 o 4

[0057] Take 50ml of ethylene glycol (EG) into a 100ml beaker, add 0.595g of CoC...

Embodiment 3

[0063] A spherical ternary composite absorbing material with a core-shell structure, according to CoFe 2 o 4 with NiFe 2 o 4 The mass ratio of 1:3 requires the design of the composite absorbing material, and the specific preparation method comprises the following steps:

[0064] 1) Preparation of acidified carbon nanofibers

[0065] First measure 60mL mixed acid (concentration is 98% concentrated sulfuric acid concentration is 95% and concentrated nitric acid is mixed with the volume ratio of 3:1) is placed in beaker, then adds 1.0g carbon nanofiber, moves in the 100ml there-necked flask, transfers Stir magnetically in an oil bath at 80°C for condensation and reflux treatment. The acidification process lasts for 6 hours; Dry in a vacuum oven at 60°C for 12 hours to obtain acidified carbon nanofibers, which are denoted as O-CNFs.

[0066] 2) Preparation of CoFe by solvothermal method 2 o 4

[0067] First, measure 50ml of ethylene glycol (EG) into a 100ml beaker, and the...

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Abstract

The invention discloses a ternary composite wave-absorbing material with a core-shell structure. The wave-absorbing material comprises carbon nanofibers and spherical CoFe2O4@NiFe2O4 loaded on the surfaces of the carbon nanofibers, wherein the CoFe2O4@NiFe2O4 comprises a CoFe2O4 core and a NiFe2O4 shell coated on the surface of the CoFe2O4 core. According to the invention, the hard magnetic ferrite CoFe2O4 and the soft magnetic ferrite NiFe2O4 are utilized to generate an exchange coupling effect and form a core-shell structure, then the core-shell structure is further loaded on the surface of the carbon nanofiber, and the obtained CoFe2O4 and NiFe2O4 / CNFs ternary composite wave-absorbing material has good conductivity and magnetic performance and balanced impedance matching and attenuation constant. As a result, excellent microwave absorption performance and effective electromagnetic wave absorption frequency band width can be obtained, and good comprehensive use performance is shown.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a ternary composite wave-absorbing material with a core-shell structure and a preparation method thereof Background technique [0002] Cobalt ferrite (CoFe 2 o 4 ) has both dielectric loss and magnetic loss, among which the magnetic loss is significant, has medium saturation magnetization, high anisotropy and stable chemical properties, and has attracted much attention in the field of microwave absorption. But a single cobalt ferrite (CoFe 2 o 4 ) as a wave-absorbing material has unsatisfactory wave-absorbing performance due to its single loss mechanism and poor impedance matching. Carbon nanofibers (CNFs) have low density, good thermal stability, small thermal expansion coefficient, high electrical conductivity, and excellent dielectric properties, but because of their nonmagnetic properties, the magnetic loss characteristics are weak, and the real part of the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01G53/00C01B32/15H05K9/00B82Y40/00B82Y30/00
CPCC01G51/00C01G53/00C01B32/15H05K9/009B82Y30/00B82Y40/00C01P2004/80C01P2004/64C01P2004/62C01P2002/72C01P2004/04C01P2006/40C01P2006/42Y02E60/10
Inventor 蔡浩鹏魏琴琴唐锐
Owner WUHAN UNIV OF TECH
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