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Nano-particle composite with double-shell microstructure and application of nano-particle composite

A microstructure and nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as narrow absorption frequency band, achieve wide absorption frequency band, broad application prospects, and high absorption strength Effect

Active Publication Date: 2015-04-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a nanoparticle composite with a double-shell microstructure and a method for absorbing microwaves, so as to solve the problem of a single type of microwave-absorbing material with a narrow absorption frequency band.

Method used

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  • Nano-particle composite with double-shell microstructure and application of nano-particle composite
  • Nano-particle composite with double-shell microstructure and application of nano-particle composite
  • Nano-particle composite with double-shell microstructure and application of nano-particle composite

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The preparation steps of the double-shell wrapped nanoparticle composite microwave absorbing material are:

[0031] (1) Barium titanate gel was prepared by sol-gel method using barium acetate and isopropyl titanate as starting materials;

[0032] (2) Disperse magnetic carbon-coated iron-cobalt nanocapsules in n-hexane to form magnetic carbon-coated iron-cobalt nanocapsules-n-hexane suspension;

[0033] (3) Prepare an aqueous solution containing n-hexane, water, ethanol and polyvinylpyrrolidone;

[0034] (4) Mix magnetic carbon-coated iron-cobalt nanocapsules-n-hexane suspension with aqueous solution, and prepare o / w microemulsion by ultrasonic method, in which polyvinylpyrrolidone is the emulsifier;

[0035] (5) Add the dielectric oxide gel to the o / w microemulsion, and form a uniformly dispersed magnetic carbon-coated iron-cobalt nanocapsule-dielectric oxide sol precursor solution by ultrasonic oscillation;

[0036] (6) Dry the precursor solution of magnetic carbon-c...

Embodiment 2

[0041] The difference from Example 1 is that the mass ratio of barium titanate: carbon-coated iron-cobalt nanocapsules is 50wt.%: 50wt.%. By adjusting the thickness of the absorbing layer, the reflection loss (RL) has an absorption lower than -20dB at different frequencies (see Figure 7 ).

Embodiment 3

[0043] The difference from Example 1 is that the mass ratio of barium titanate: carbon-coated iron-cobalt nanocapsules is 80wt.%: 20wt.%. After testing, the reflection loss (RL) of the obtained composite material has an absorption lower than -15dB at different frequencies (see Figure 8 ).

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Abstract

The invention discloses a nano-particle composite wave-absorbing material with a double-shell microstructure so as to solve the defect that absorption frequency bands of the current wave absorbing materials are narrow. The nano-particle composite wave-absorbing material is characterized in that the composite wave-absorbing material is in a double-shell microstructure, an external shell is made of dielectric oxides, an internal shell is made of carbon, and an inner core is made of ferromagnetic materials. The nano-particle composite wave-absorbing material has the advantages that gradual impedance gradation is generated through the structural change of dielectric oxide shell-carbon shell-magnetic metal particle core, so that electromagnetic waves can maximumly transmit into the material, and the reflection of the electromagnetic waves is lowered; besides, the characteristics of resistance loss, dielectric loss and magnetic loss of the composite material, and ample interfacial polarization in the double-shell microstructure are utilized, so that the electromagnetic waves entering into the interior of the material rapidly attenuate. The composite material has the advantages of small density and wide frequency bands. The composite material has a wide application prospect in electromagnetic shielding, electrorheological fluids, functional coatings and the like.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorption, and particularly provides a nanoparticle composite with a double-shell microstructure and a method for absorbing microwaves. Background technique [0002] The function of the microwave absorbing material is to absorb the microwave incident into the material, and convert the microwave electromagnetic energy into heat energy, thereby reducing the microwave reflection cross section. Such materials have been widely used in military and civilian fields such as electromagnetic pollution shielding and stealth technology. At present, the radar wave absorbing materials that are widely used can be divided into two types: electric loss and magnetic loss according to the mechanism of electromagnetic loss. According to different application methods, it can be divided into coating-type absorbing materials, structural-type composite absorbing materials, draped barrier-type stealth materials, etc....

Claims

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Application Information

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IPC IPC(8): C09K3/00B82Y30/00B82Y40/00
Inventor 李达姜菁菁李少杰耿殿禹王振华刘伟张志东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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