A magnetic composite microsphere with multi-level structure and its preparation method

A technology of magnetic composite microspheres and microspheres, applied in the field of nanomaterials, can solve the problems of low density, high difficulty, and improved wave absorbing performance.

Active Publication Date: 2017-03-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the medium that absorbs waves in this kind of magnetic composite microspheres at this stage is mainly the magnetic metal nanoparticle film on the surface of the microspheres, the improvement of the wave-absorbing performance can only be adjusted by the composition of the film layer and the size of the particles. In the case of low density and limited film thickness, it is difficult to greatly improve the absorbing performance

Method used

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  • A magnetic composite microsphere with multi-level structure and its preparation method
  • A magnetic composite microsphere with multi-level structure and its preparation method
  • A magnetic composite microsphere with multi-level structure and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]Use 0.5g of hollow glass microspheres with a particle size of 30-200μm as the substrate, aminopropyltriethoxysilane as the coupling agent, and react at 40°C for 10h in an aqueous solution of the coupling agent with a concentration of 0.1%. , filtered, washed and dried. Then, the coupled hollow glass microspheres were put into an aqueous solution of nano-palladium with a concentration of 0.5 g / L, and reacted at 40° C. for 30 min. After the reaction, filter and wash with water three times to obtain hollow glass microspheres loaded with seed metal palladium. Add the hollow glass microspheres loaded with seed metal palladium with 0.2g of nickel chloride, 0.8g of cobalt chloride, and 6.0mg of palladium chloride into 30g of ethylene glycol, and mix well. After the metal salt is fully dissolved, the mixed solution Add it to the polytetrafluoroethylene lining of the stainless steel reactor and seal it. The reaction kettle was placed in an oven at 140°C and reacted for 8 hours....

Embodiment 2

[0048] Use 0.5 g of hollow ceramic microspheres with a particle size of 40-100 μm as the substrate, aminopropyltriethoxysilane as the coupling agent, and react at 70 ° C for 1 h in a 2% coupling agent aqueous solution , filtered, washed and dried. Then, put the coupling-treated hollow ceramic microspheres into an aqueous solution of gold nanoparticles with a concentration of 2.0 g / L, and react at 70° C. for 240 min. After the reaction, filter and wash with water three times to obtain hollow ceramic microspheres loaded with seed metal gold. The hollow ceramic microspheres loaded with seeds are added to 30 g of 1,2-propylene glycol with 0.15 g of cobalt acetate and 7.5 mg of chloroauric acid, and mixed evenly. After the metal salt is fully dissolved, the mixed solution is added to the poly Teflon lined, sealed. The reaction kettle was placed in an oven at 200°C and reacted for 0.5h. The floating product was separated, washed with ethanol, filtered and dried to obtain magnetic...

Embodiment 3

[0050] Use 0.5g of hollow polyacrylic resin microspheres with a particle size of 1-80 μm as the substrate, and use mercaptopropyltrimethoxysilane as the coupling agent, and react at 50°C in a 1% coupling agent aqueous solution 4h, filter, wash and dry. Then, the coupled hollow microspheres were put into an aqueous solution of nano-ruthenium with a concentration of 1.0 g / L, and reacted at 50° C. for 120 min. After the reaction, filter and wash with water three times to obtain hollow microspheres loaded with seed metal ruthenium. Add the hollow microspheres loaded with seeds with 2.0g of cobalt nitrate, 1.0g of nickel acetate, and 15mg of silver nitrate into 30g of 1,3-propanediol and mix well. After the metal salt is fully dissolved, add the mixture to the stainless steel reaction kettle Teflon liner, sealed. The reaction kettle was placed in an oven at 100°C and reacted for 48 hours. The floating product was separated, washed with ethanol, filtered and dried to obtain magne...

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Abstract

The invention discloses magnetic composite microspheres with a multilevel structure and a preparation method thereof. The magnetic composite microspheres comprise spherical kernels and spherical shells, wherein the spherical kernels are hollow microspheres with the particle size of 1-200 micrometers; the spherical shells are formed by nanowires or nanorods which are perpendicular to the spherical kernels and formed by cobalt, nickel or cobalt-nickel alloy; the diameter of nanowires or nanorods is 10-00 nm, and the length of nanowires or nanorods is 50-2000 nm. According to the magnetic composite microspheres with the multilevel structure and the preparation method thereof, provided by the invention, a metal nanometer array structure is assembled on the surfaces of the hollow microspheres, so that the magnetic composite microspheres with the multilevel structure are obtained, the characteristics of light weight, thermal insulation and efficient absorption of electromagnetic waves are achieved; besides, the magnetic composite microspheres can serve as high-performance and light electromagnetic-wave absorbing materials, and can be further used for preparing high-performance electromagnetic wave absorption composite materials and camouflage paint.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a magnetic composite microsphere with a multi-level structure and a preparation method thereof. Background technique [0002] As a traditional electromagnetic wave absorbing material, magnetic metal micropowder has always been plagued by problems such as high density and narrow absorption frequency band, and it is difficult to meet the development requirements of wave absorbing materials, which seriously limits its further application in this field. In order to meet the new requirements, this traditional electromagnetic wave absorbing material must be greatly improved. [0003] The nanometerization of magnetic metal is one of the means to improve its electromagnetic wave absorption performance. Through nano-processing, the specific surface area and interface polarization of the magnetic metal increase sharply, and the electromagnetic wave absorption capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147H01F1/20B01J13/02
Inventor 潘顺龙贾瑞杰张敬杰杨岩峰
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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