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A nanoparticle composite with a double-shell microstructure and its applications

A microstructure and nanoparticle technology, applied in the fields of nanotechnology, nanotechnology, and nanotechnology for materials and surface science, can solve problems such as narrow absorption frequency bands, achieve wide absorption frequency bands, broad application prospects, and high absorption intensity. Effect

Active Publication Date: 2017-08-25
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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  • A nanoparticle composite with a double-shell microstructure and its applications
  • A nanoparticle composite with a double-shell microstructure and its applications
  • A nanoparticle composite with a double-shell microstructure and its applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0031] (1) The sol-gel method is used to prepare barium titanate gel with barium acetate and isopropyl titanate as starting materials;

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

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

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

[0035] (5) Add the dielectric oxide gel to the o / w type 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 solut...

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 absorption layer, the reflection loss (RL) has an absorption below -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 resulting composite material reflection loss (RL) has an absorption lower than -15dB at different frequencies (see Figure 8 ).

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Abstract

The invention designs a novel nano-particle composite wave-absorbing material with a double-shell microstructure to solve the problem of narrow absorption frequency band of the current wave-absorbing material. It is characterized in that the composite microwave absorbing material has a double-shell microstructure, the outer shell is made of dielectric oxide, the inner shell is carbon, and the inner core is made of ferromagnetic material. The advantage is that it can produce a gentle impedance gradient through the structural change of the dielectric oxide shell-carbon shell-magnetic metal particle core, so that the electromagnetic wave can be incident into the material to the maximum and reduce the electromagnetic wave reflection; at the same time, the resistance loss of this type of composite material can be utilized , dielectric loss, magnetic loss characteristics, and rich interfacial polarization in the double-shell microstructure, the electromagnetic waves entering the material are rapidly attenuated. The composite material has the advantages of small density and wide frequency band. It has broad application prospects in electromagnetic shielding, current variants, and functional coatings.

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 incident microwaves in 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 more common radar wave absorbing materials can be divided into electrical loss and magnetic loss according to the electromagnetic loss mechanism. According to the different application methods, it can be divided into coating type absorbing materials, structural composite absorbing materials, draped and obstructing stealth materials, etc. Among them, the coated a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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