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Microwave absorbing material with periodic nanostructure and preparation thereof

A technology of microwave absorbing materials and nanostructures, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult adjustment of electromagnetic parameters of microwave absorbers, heavy weight, weak absorption attenuation, etc.

Inactive Publication Date: 2009-08-12
ANHUI UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the electrochemical assembly of magnetic nano-metal wire arrays, the substrate must have conductivity, and only a few magnetic metals with high density can be prepared as wave absorbers. The types of wave absorbers are strictly limited. Electromagnetic parameters are difficult to control; and metal as a wave absorbing agent, first of all, its weight is relatively heavy, and the absorption attenuation of metal is relatively weak, and the maximum absorption attenuation is less than 6dB

Method used

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  • Microwave absorbing material with periodic nanostructure and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] ①Preparation of sol precursor solution: add 0.1 mol of divalent metal iron salt and 0.2 mol of trivalent metal iron salt into 50 ml of water, stir evenly, add 0.13 mol of organic acid into it, and after fully stirring, use Concentrated ammonia water adjusts the pH value of the solution to neutral, then adds 1.5 moles of urea, stirs, and when it is completely dissolved, under the protection of nitrogen, heat the above solution in an oil bath to 80 degrees Celsius and keep it for 2 hours to obtain a sol precursor solution .

[0020] ② Anneal the aluminum sheet for 10 hours at 500 degrees Celsius. After taking it out, use 85% phosphoric acid with mass fraction, 68% concentrated nitric acid by mass fraction, and water to make a mixed solution at a volume ratio of 8:1:1. After chemical polishing until the surface is bright, aluminum sheet is used as an anode, electrochemically corroded in an oxalic acid solution of 0.4 mol / L at 5 degrees Celsius and a voltage of 40 volts for 12 ...

Embodiment 2

[0024] In step ③, the oil bath is heated to 160 degrees Celsius and kept for 5 hours

[0025] The other steps are the same as in Example 1.

Embodiment 3

[0027] ①Preparation of the sol precursor solution: add 0.05 moles of divalent metal iron salt, 0.2 moles of trivalent metal iron salt and 0.05 moles of cobalt metal salt into 50 ml of water, stir well, add 0.3 moles of organic acid to it After fully stirring, adjust the pH value of the solution to neutral with concentrated ammonia water, then add 5 moles of urea, stir, after it is completely dissolved, under the protection of argon, heat the above solution in an oil bath to 80 degrees Celsius and keep it warm for 2 Hours to obtain a sol precursor solution.

[0028] The other steps are the same as in Example 1.

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Abstract

The invention relates to a microwave absorption material with a periodic nanometer structure and a preparation method thereof. A wave absorber of the microwave absorption material with the periodic nanometer structure is filled around the inner walls of holes of a substrate, and the middle parts of the holes of the substrate have hollow structures. The preparation method comprises the following steps: preparing a sol precursor; and then preparing a porous template with a periodic nano-hole structure, dipping the porous template into sol precursor solution, performing oil-bath heating to a temperature of between 80 and 160 DEG C for 1 to 5 hours under the protection of nitrogen, taking out the template for drying, then annealing at a temperature of between 300 and 800 DEG C for 1 to 20 hours under the protection of the nitrogen, and finally obtaining the microwave absorption material with the periodic nanometer structure. The microwave absorption material has the advantages of small density, relatively lighter weight, and relatively better wave-absorbing effectiveness, and has absorption characteristics of narrow frequency and high efficiency.

Description

Technical field [0001] The invention relates to a structure of a wave absorbing material and a preparation method thereof, in particular to a material structure for microwave absorption and a preparation method thereof. Background technique [0002] Environmental electromagnetic pollution caused by electromagnetic radiation affects human health, which has attracted increasing attention from various countries. The use of high-efficiency absorbing materials can effectively reduce the pollution of electromagnetic radiation to the environment and reduce the harm of electromagnetic radiation to the human body. According to the molding process, the absorbing materials can be divided into structure type and coating type. The absorbing materials currently prepared are basically uniformly dispersed systems, regardless of whether they are structured or coated. State, the obtained absorbing materials are denser, and most of them are micron-sized. There are relatively few researches on absor...

Claims

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Application Information

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IPC IPC(8): C09K3/00C04B32/00
Inventor 毕红孙俊
Owner ANHUI UNIVERSITY
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