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A kind of electromagnetic reinforced carbon magnetic composite material and its preparation method and application

A composite material, electromagnetic technology, applied in the fields of carbon compounds, chemical instruments and methods, nanotechnology for materials and surface science, etc. Novel, easy composition, and novel effect of formation mechanism

Active Publication Date: 2017-12-22
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current material synthesis method is difficult to prepare high double anisotropy materials, which limits the improvement of magnetic permeability

Method used

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  • A kind of electromagnetic reinforced carbon magnetic composite material and its preparation method and application
  • A kind of electromagnetic reinforced carbon magnetic composite material and its preparation method and application
  • A kind of electromagnetic reinforced carbon magnetic composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add expanded graphite (500mg), PVP (2g), and water (150mL) obtained by expanding at 700°C to a 250mL beaker and stir for 12 hours to obtain modified expanded graphite, then mix the modified expanded graphite with iron glycolate Nanosheets (200mg) and water (100mL) were mixed and stirred in a beaker for 2h. The product obtained after suction filtration was baked in a vacuum oven at 60°C for 5 hours, and finally the sample was placed in N 2 Sintering at 400°C for 2 hours under protection to obtain an electromagnetically reinforced carbon-magnetic composite material.

[0043] The obtained electromagnetically reinforced carbon-magnetic composite material, its phase, morphology and structure observed under scanning electron microscope and transmission electron microscope are as follows Figure 1~3 As shown, the product is Fe 3 o 4 Composite with expanded graphite, the expanded graphite is 120-850 μm long and 60-260 μm wide, and its surface is evenly distributed with ellip...

Embodiment 2

[0046] The steps are the same as in Example 1, but the calcination temperature is 300°C. Gained electromagnetically reinforced carbon-magnetic composite material, its physical phase is as figure 1 As shown, the product is Fe 3 o 4 and expanded graphite composite; its static magnetic properties such as Figure 8 As shown, the saturation magnetization is 12.01emu·g -1 , the coercive force is 40.57Oe; its electromagnetic parameters are as Figure 9-10 As shown, the real part and imaginary part of the dielectric constant increase by 0.5 to 22 and 6.5 to 90 times compared with expanded graphite in the frequency range of 2 to 18 GHz, and the real and imaginary parts of the magnetic permeability relative to Fe 3 o 4 Nanorings increased by 3-4 and 2.5-19.5 times, respectively.

Embodiment 3

[0048] The steps are the same as in Example 1, but the calcination temperature is 500°C. Gained electromagnetically reinforced carbon-magnetic composite material, its physical phase is as figure 1 As shown, the product is Fe 3 o 4 and expanded graphite composites. Its static magnetic properties are as Figure 8 As shown, the saturation magnetization is 10.88emu·g -1 , the coercive force is 63.57Oe; its electromagnetic parameters are as Figure 9-10 As shown, the real part and imaginary part of the dielectric constant increase by 0.5 to 7 and 4.5 to 160 times compared with expanded graphite in the frequency range of 2 to 18 GHz, and the real part and imaginary part of the magnetic permeability relative to Fe 3 o 4 The nanorings increased by 2-2.5 and 3-7.5 times respectively.

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Abstract

The invention relates to an electromagnetically enhanced carbon magnetic composite material, and a preparation method and an application thereof. The composite material comprises expandable graphite and spinel structured Fe3O4, and an atom ratio of carbon to iron is 22.58-95.15. The preparation method of the composite material comprises the following steps: preparing the expandable graphite, preparing an expandable graphite / iron glycollate nanosheet compound, and preparing an expandable graphite / Fe3O4 nanoring compound. The carbon magnetic material has the advantages of novel design idea and substantially enhanced electromagnetic parameters, and has wide application prospect in the fields of shielding, microwave absorption, electrode materials, removal of disinfection byproducts, magnetic sensors, detection, biological separation or medical imaging; and the method has the advantages of novel formation mechanism, simple process, and easy control of the composition.

Description

technical field [0001] The invention relates to the field of electromagnetic functional materials, in particular to a method for designing, preparing and using an electromagnetically reinforced carbon-magnetic composite material. Background technique [0002] Designing and preparing new high-efficiency electromagnetic wave shielding and absorbing materials is an effective way to solve the current problem of microwave electromagnetic pollution. Microwave absorbing materials with excellent performance must meet the impedance matching conditions (ie μ'~ε') and strong electromagnetic wave absorption (or attenuation) characteristics (ie high tgδ E , tgδ M ). At present, the dielectric constant can be adjusted in a wide range through the combination of different lossy microwave absorbers and the regulation of their composition, morphology, structure, size, distribution, surface and interface. Due to the limitation of the Snoek limit, it is still a worldwide problem to greatly i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/08C01B32/205C01B32/21B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G49/08C01P2002/72C01P2004/03C01P2004/04C01P2004/80C01P2006/40C01P2006/42
Inventor 童国秀赵彦婷洪华嫦钱瑶钱纳新樊梦婷吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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