A kind of preparation method of magnetic graphene nano volume absorbing material

A technology of magnetic graphene and wave absorbing materials, applied in the field of wave absorbing materials, can solve the problems of ineffective utilization of a large number of heterogeneous interfaces, poor chemical uniformity, and easy occurrence of agglomeration, so as to improve the interface polarization ability, inhibit agglomeration, The effect of improving electromagnetic wave absorption performance

Active Publication Date: 2022-06-24
HARBIN INST OF TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong dipole moment between the magnetic substances, the magnetic metal particles of the one-dimensional magnetic graphene-based composites are prone to agglomeration, which leads to poor chemical uniformity of the material, and does not give full play to the advantages of graphene and magnetic materials. characteristics, resulting in a large number of heterogeneous interfaces that cannot be effectively utilized, and do not meet the requirements of thin, light, wide and strong modern absorbing materials

Method used

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  • A kind of preparation method of magnetic graphene nano volume absorbing material
  • A kind of preparation method of magnetic graphene nano volume absorbing material
  • A kind of preparation method of magnetic graphene nano volume absorbing material

Examples

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Embodiment 1

[0026] Embodiment 1, the preparation method of the magnetic graphene nano-roll wave absorbing material in the present embodiment is carried out according to the following steps:

[0027] Step 1. Dissolve 30g graphene oxide sponge, 40g acidified carbon nanotubes and 30g cobalt nitrate in 100mL deionized water, carry out mechanical stirring at a speed of 300rpm until uniform, and then carry out an electrostatic self-assembly reaction at an ultrasonic frequency of 20KHz to form a Dimensional nano rolls, quick freezing;

[0028] Step 2, then freeze-drying: under the vacuum degree of 5Pa, the temperature is -10°C, and the freeze-drying is continued for 48 hours;

[0029] Step 3: Take out the freeze-dried material, place it in a tube furnace, heat treatment, use nitrogen as a protective gas, heat up to 500 °C at a rate of 5 °C / min, treat at a constant temperature for 1 h, and cool with the furnace to obtain magnetic graphene Nano roll absorber.

[0030] The preparation method of t...

Embodiment 2

[0035] Example 2. The difference between this example and Example 1 is that the heat treatment temperature in this example is 600°C. Other steps and parameters are the same as in Example 1. According to the results of electromagnetic parameters test such as image 3 shown, image 3 It is shown that the highest reflection loss of the cobalt-based magnetic graphene nano-roll composite material can reach -64.49dB, and it also shows strong electromagnetic wave absorption performance, which further shows that the structure designed by the present invention can effectively suppress the agglomeration phenomenon of magnetic nanoparticles and the distribution of nanoparticles uniform and improve the absorbing performance. Compared with ordinary magnetic graphene-based absorbing materials, the new one-dimensional magnetic graphene-based composites have excellent complementarity between the dielectric loss and magnetic loss, so their absorbing properties vary with the pyrolysis tempera...

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Abstract

The invention discloses a preparation method of a magnetic graphene nano-volume wave-absorbing material, belonging to the field of wave-absorbing materials. The invention solves the problem that there is a strong magnetic dipole moment effect between the magnetic metal particles, which leads to the problem that the magnetic metal particles are easily agglomerated. The method of the present invention: 1. Dissolve the graphene oxide sponge, acidified carbon nanotubes and cobalt nitrate in deionized water, mechanically stir until uniform, and then carry out electrostatic self-assembly reaction under ultrasonic to form a one-dimensional nano-volume, and freeze quickly; 2. Then freeze-drying; 3. Then heat treatment under the protection of inert gas. The invention effectively inhibits the agglomeration of magnetic nanoparticles, realizes the effective and uniform dispersion of magnetic particles, improves the impedance matching degree of materials, increases the heterogeneous interface, improves the interface polarization ability of materials, and exerts the synergistic advantages of magnetic materials and graphene materials , and effectively improve the electromagnetic wave absorption performance of the composite material.

Description

technical field [0001] The invention belongs to the field of wave absorbing materials, and in particular relates to a preparation method of a magnetic graphene nano-roll wave absorbing material. Background technique [0002] With the rapid development of modern electronic technology, while providing a lot of convenience, it also brings a series of serious problems such as serious electromagnetic interference, electromagnetic information leakage and electromagnetic radiation pollution. one of the effective ways of electromagnetic problems. [0003] The electromagnetic wave attenuation ability of the absorbing material is related to the dielectric loss, magnetic loss and impedance matching characteristics of the material. Traditional magnetic metal materials have the advantages of high saturation magnetization, strong magnetic loss ability, and low cost, and are regarded as good absorbing materials, but magnetic metal absorbing materials also have many shortcomings, such as p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184B22F1/16C22C1/10H05K9/00B82Y40/00B82Y30/00B82Y25/00
CPCC01B32/184C22C1/1026C22C26/00H05K9/0081B82Y40/00B82Y30/00B82Y25/00C22C2026/002
Inventor 吴晓宏石婷姚远秦伟洪杨刘杨卢松涛李杨康红军
Owner HARBIN INST OF TECH
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