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Helical carbon nanocoil/core-shell magnetic nanoparticle composite material, preparation method and application in the field of electromagnetic waves

A technology of magnetic nanoparticles and carbon nanocoils, applied in nanomagnetism, nanotechnology, nanotechnology, etc., can solve the problems of restricting large-scale preparation economy, low maximum loss, large coating thickness, etc., and achieve suitable mass preparation , increase the magnetic loss, the effect of high absorption strength

Active Publication Date: 2021-08-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that CNC, as a new type of absorbing material, has gradually become a research hotspot, but it is worth noting that the reported CNC-based composite absorbing materials still have shortcomings such as low maximum loss and relatively large coating thickness. In addition, the use of expensive equipment such as ALD severely restricts the economics of large-scale preparation
On the other hand, it is considered that CNC materials with a magnetic core-shell structure have a variety of polarization loss and magnetic loss mechanisms, but there are no reports yet

Method used

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  • Helical carbon nanocoil/core-shell magnetic nanoparticle composite material, preparation method and application in the field of electromagnetic waves

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) CNC is prepared by CVD method (Reference: Patent Publication No. 109201068A, named as a preparation method and application of a catalyst for carbon nanocoil synthesis with reduced by-product carbon layer).

[0035] (2) Disperse 100mg of CNC powder in 25ml of absolute ethanol, and ultrasonically disperse it evenly for 1h, press CNC:Fe 2+ Add soluble Fe at a mass ratio of 1:2 2+ (FeCl 2 ·5H 2 0), dropwise add the polyethylene glycol solution (PEG) of 10ml dilute ammonia water (mass fraction 2.5wt%), 0.2ml hydrogen peroxide (mass fraction 28wt%) 10ml (50g / L), then mixed solution ultrasonic 10min, then The resulting mixed solution was poured into the lining of a polytetrafluoroethylene reactor, and the reactor was placed at 160°C for 8 hours, and then the product was rinsed three times with deionized water and alcohol suction filtration, and dried to obtain CNC / Fe 3 o 4 Complex.

[0036] (3) get the CNC / Fe prepared by process (2) 3 o 4 The composite is placed in ...

Embodiment 2

[0041] (1) The CNC preparation method is the same as that of the implementation example (1).

[0042] (2) Disperse 100mg of CNC powder in 25ml of ethylene glycol, and ultrasonically disperse it for 1h, press CNC:Fe 3+ Add soluble Fe at a mass ratio of 1:1 3+ (Fe(NO 3 ) 3 ·5H 2 O), then add 0.5g polyethylene glycol, 1.5g sodium acetate, ultrasonic the mixed solution for 10min, then pour the gained mixed solution into the lining of polytetrafluoroethylene reactor, and place the reactor at 140°C for reaction After 30h, the resulting product was rinsed 3 times with deionized water and alcohol suction filtration, and after drying, the CNC / Fe 3 o 4 Complex.

[0043] (3) get the CNC / Fe prepared by process (2) 3 o 4 The composite is placed in a quartz tube, and the Fe 3 o 4 Surface covered with carbon. The reaction temperature was 400° C., and the reaction gases were argon with a flow rate of 100 sccm and acetylene with a flow rate of 10 sccm (the flow rate ratio of inert g...

Embodiment 3

[0048] (1) The CNC preparation method is the same as that of the implementation example (1).

[0049] (2) Disperse 100mg of CNC powder in 25ml of absolute ethanol, and ultrasonically disperse it evenly for 1h, press CNC:Fe 2+ Add soluble Fe at a mass ratio of 1:4 2+ (FeCl 2 ·5H 2 0), dropwise add the polyethylene glycol solution (PEG) of 10ml dilute ammonia water (mass fraction 2.5wt%), 0.2ml hydrogen peroxide (mass fraction 28wt%) 10ml (50g / L), then mixed solution ultrasonic 10min, then The resulting mixed solution was poured into the lining of a polytetrafluoroethylene reactor, and the reactor was placed at 220°C for 4 hours to react, and then the product was rinsed three times with deionized water and alcohol suction filtration, and dried to obtain CNC / Fe 3 o 4 Complex. (3) get the CNC / Fe prepared by process (2) 3 o 4 The composite is placed in a quartz tube, and the Fe 3 o 4 Surface covered with carbon. The reaction temperature was 600° C., and the reaction gases...

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Abstract

A helical carbon nanocoil / core-shell magnetic nanoparticle composite material, a preparation method and its application in the field of electromagnetic waves belong to the field of electromagnetic wave absorption. Spiral carbon nanocoil / magnetic particle / carbon (CNC / M) provided by the invention particle / C) The composite material has a core-shell structure. The material uses a three-dimensional helical carbon nanocoil as the basic carrier, and the carbon shell coated on the periphery of the magnetic particles is regulated by the chemical vapor deposition (CVD) method. The preparation method includes: the first step, using solvothermal / hydrothermal method or physical vapor deposition technology to compound magnetic particles on the surface of CNC. In the second step, carbon shells are coated on the surface of magnetic particles using chemical deposition technology. The preparation process of the present invention is simple and easy, the requirements for the experimental conditions are low, and the experimental raw materials are cheap and easy to obtain; the prepared spiral core-shell structure wave-absorbing material can effectively improve the maximum reflection loss value and effective bandwidth of the material in the frequency range of 2-18 GHz , is an ideal material that can meet the requirements of civilian electronic devices and military electromagnetic compatibility and protection.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorption, and relates to a preparation method and application of a helical carbon nanocoil / core-shell magnetic nanoparticle composite material, in particular to a nanocomposite material and its synthesis method and the electromagnetic wave absorption performance of the composite material . Background technique [0002] With the rapid development of high-tech, electromagnetic wave absorbing materials closely related to human health, environmental safety, information security and national defense construction have become research hotspots. At present, a large number of studies have shown that high-performance wave-absorbing materials should also have excellent dielectric properties. Multiple electromagnetic wave attenuation mechanisms such as loss, conductance loss and magnetic loss, and good impedance matching characteristics. [0003] Carbon nanomaterials (such as carbon nano-onions, carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00B82Y25/00B82Y30/00
CPCB82Y25/00B82Y30/00H01Q17/008
Inventor 潘路军赵永鹏张豪
Owner DALIAN UNIV OF TECH
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