In-situ preparation method of multilayer core-shell nano-structure and use thereof in preparation of electromagnetic wave absorbing material

A nanostructure, in-situ preparation technology, applied in magnetic materials, nanotechnology, nanotechnology, etc., can solve the problems of flammable and explosive reactions, poor quality of nanostructures, toxic and harmful exhaust gas, etc., to achieve controllable reaction conditions, improve Return loss, size controllable effect

Active Publication Date: 2018-05-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among the many methods for preparing multilayer core-shell nanostructures, gas phase methods are represented by chemical vapor deposition and arc discharge. The quality of the prepared nanostructures is good, but there are still problems such as expensive raw materials, flammable and explosive reactions, and toxic and harmful exhaust gases. Problem: Liquid-phase methods are represented by hydrothermal / solvothermal, sol-gel, and microemulsion. The product has good repeatability, but the shell coating cannot be done in situ, and impurities are easily introduced, and the reaction time is long. The pressure vessel is highly dangerous, and the closed reactor cannot observe and control the growth process; the solid-phase method is represented by mechanical alloying, and the cost of raw materials is relatively low, but the quality of the nanostructure is poor, and the particle size and uniformity are uncontrollable
Therefore, the above factors still restrict the application of multilayer core-shell structure in electromagnetic wave absorption.

Method used

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  • In-situ preparation method of multilayer core-shell nano-structure and use thereof in preparation of electromagnetic wave absorbing material
  • In-situ preparation method of multilayer core-shell nano-structure and use thereof in preparation of electromagnetic wave absorbing material
  • In-situ preparation method of multilayer core-shell nano-structure and use thereof in preparation of electromagnetic wave absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The in-situ preparation method of the ferrite / oxide / polymer multilayer core-shell nanostructure in this example is as follows:

[0048] 1. Fe 3 o 4 Preparation of magnetic cores

[0049] 1a. Add 2mmol of ferric chloride (FeCl 3 ), and stir evenly, and prepare ferric chloride alcohol solution; add 0.2g polyethylene glycol (PEG) to the obtained ferric chloride alcohol solution, and the device is fed with nitrogen protection, and with a heating rate of 5° C. / min, from The room temperature began to warm up to 220°C, and the reaction was refluxed and stirred at 220°C at a rate of 500rpm for 1h;

[0050] 1b. Dissolve 1g of sodium hydroxide (NaOH) in 20ml of diethylene glycol to prepare an alcoholic sodium hydroxide solution, and quickly inject 1.75ml of the alcoholic sodium hydroxide solution through a needle into the reaction solution obtained in 1a at 220°C In the process, a black precipitate was produced immediately, and the stirring was continued for 1 h at 220 ° C in...

Embodiment 2

[0058] The in-situ preparation method of the ferrite / oxide / amorphous oxide multilayer core-shell nanostructure in this example is as follows:

[0059] 1. Fe 3 o 4 Preparation of magnetic cores

[0060] 1a. Add 2mmol of ferric chloride (FeCl 3 ), and stir evenly, and prepare ferric chloride alcohol solution; add 0.2g polyethylene glycol (PEG) to the obtained ferric chloride alcohol solution, and the device is fed with nitrogen protection, and with a heating rate of 5° C. / min, from The room temperature began to warm up to 220°C, and the reaction was refluxed and stirred at 220°C at a rate of 500rpm for 1h;

[0061] 1b. Dissolve 1g of sodium hydroxide (NaOH) in 20ml of diethylene glycol to prepare an alcoholic sodium hydroxide solution, and quickly inject 1.75ml of the alcoholic sodium hydroxide solution through a needle into the reaction solution obtained in 1a at 220°C In the process, a black precipitate was produced immediately, and the stirring was continued for 1 h at 22...

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Abstract

The invention discloses an in-situ preparation method of a multilayer core-shell nano-structure and use thereof in preparation of an electromagnetic wave absorbing material. The in-situ preparation method of the multilayer core-shell nano-structure includes: adding molysite and doped other metal salt to a liquid high boiling point solvent, rapidly and instantaneously achieving a nucleation and crystallization effect through thermal injection of an alkaline solution, and acquiring a ferrite core; using the ferrite core as a seed, and coating the ferrite core with an oxide nano shell layer and apolymer or amorphous oxide shell layer by injecting the metal salt and a surfactant; and successively repeating the injection coating step, and in-situ-preparing and growing a multilayer oxide / polymer core-shell composite nano-structure. The in-situ preparation method is simple to operate, is controllable in process, is low in cost, and is short in time; and the multilayer core-shell nano-structure is even in size, is small in particle size, is high in chemical stability, and is used for preparing the electromagnetic wave absorbing material.

Description

technical field [0001] The invention relates to a preparation method of a core-shell structure and its application, in particular to an in-situ preparation method of a multilayer core-shell nanostructure and its application in the preparation of electromagnetic wave absorbing materials. Background technique [0002] Electromagnetic radiation and pollution have become another serious environmental pollution problem after water pollution and air pollution in the world today. With the vigorous development of the electronic information industry, the rapid popularization of consumer electronic products, and the comprehensive coverage of wireless communication networks, electromagnetic radiation in space has occupied various frequency bands unprecedentedly, and its intensity has increased rapidly resulting in a complex electromagnetic environment. And electromagnetic pollution, it has produced serious electromagnetic interference to surrounding electronic equipment, and has also p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00H01F41/00H05K9/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01F1/0054H01F41/00H05K9/0081
Inventor 汪嘉恒张鹏王宝峰丁修蔚王家棋朱鹏飞李映欣吴玉程
Owner HEFEI UNIV OF TECH
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