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Preparation method of three-dimensional carbon network loaded cobalt ferrite nanoparticle composite wave absorber

A network loading, nanoparticle technology, applied in the field of wave absorbing materials, can solve the problems of complex preparation process, limited development and application, low yield, etc., and achieve the effect of simple preparation process and uniform distribution

Inactive Publication Date: 2019-01-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been many reports on the research on carbon-based ferrite composite absorbers, the high cost, complicated preparation process, and low output limit its development and application.
In addition, the addition of most of the existing carbon-based ferrite absorbers in the matrix is ​​still above 30wt%, and the effective absorption band is still below 6GHz, and the performance of light weight and broadband needs to be further improved

Method used

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  • Preparation method of three-dimensional carbon network loaded cobalt ferrite nanoparticle composite wave absorber
  • Preparation method of three-dimensional carbon network loaded cobalt ferrite nanoparticle composite wave absorber
  • Preparation method of three-dimensional carbon network loaded cobalt ferrite nanoparticle composite wave absorber

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Effect test

Embodiment 1

[0021] Weigh 0.647g cobalt nitrate hexahydrate, 1.796g ferric nitrate nonahydrate, 2.667g anhydrous glucose, 39g sodium chloride, dissolve the mixture in 130ml deionized water and magnetically stir for 4 hours to obtain a uniform mixed solution. The resulting solution was poured into two petri dishes with a diameter of 18 cm, and then placed in a refrigerator and frozen at -20° C. for 24 h. The frozen two trays of solution were put into a freeze dryer, and vacuum-dried at -50°C for 24 hours to obtain a precursor. Grind the precursor into powder, take 15g and put it in the ark, put the ark into the constant temperature zone of the tube furnace, pass through 400ml / min Ar for 15min to exhaust the air, then use 80ml / min Ar as the protective atmosphere, and set the temperature at 10℃ / min The heating rate was increased to 630°C, and the carbonization of glucose and the decomposition of cobalt nitrate and ferric nitrate were carried out at the heat preservation for 2 hours. After the...

Embodiment 2

[0025] Weigh 0.647g cobalt nitrate hexahydrate, 1.796g ferric nitrate nonahydrate, 2.667g anhydrous glucose, 39g sodium chloride, dissolve the mixture in 130ml deionized water and magnetically stir for 4 hours to obtain a uniform mixed solution. The resulting solution was poured into two petri dishes with a diameter of 18 cm, and then placed in a refrigerator and frozen at -20° C. for 24 h. The frozen two trays of solution were put into a freeze dryer, and vacuum-dried at -50°C for 24 hours to obtain a precursor. Grind the precursor into powder, take 15g and put it in the ark, put the ark into the constant temperature zone of the tube furnace, pass through 400ml / min Ar for 15min to exhaust the air, then use 80ml / min Ar as the protective atmosphere, and set the temperature at 10℃ / min The heating rate was increased to 600°C, and the carbonization of glucose and the decomposition of cobalt nitrate and ferric nitrate were carried out at the heat preservation for 2 hours. After the...

Embodiment 3

[0027]Weigh 0.647g cobalt nitrate hexahydrate, 1.796g ferric nitrate nonahydrate, 2.667g anhydrous glucose, 39g sodium chloride, dissolve the mixture in 130ml deionized water and magnetically stir for 4 hours to obtain a uniform mixed solution. The resulting solution was poured into two petri dishes with a diameter of 18 cm, and then placed in a refrigerator and frozen at -20° C. for 24 h. Put the frozen two trays of solutions into a freeze dryer, and dry them under vacuum at -50°C for 24 hours to obtain the precursor. Grind the precursor into powder, take 15g and put it in the ark, put the ark into the constant temperature zone of the tube furnace, pass through 400ml / min Ar for 15min to exhaust the air, then use 80ml / min Ar as the protective atmosphere, and set the temperature at 10℃ / min The heating rate was increased to 620 ° C, and the carbonization of glucose and the decomposition of cobalt nitrate and ferric nitrate were carried out at the heat preservation for 2 hours. A...

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Abstract

The invention relates to a preparation method of a three-dimensional carbon network loaded cobalt ferrite nanoparticle composite wave absorber. The preparation method comprises the following steps: (1) preparing composite precursor powder by using a freeze-drying method, namely dissolving a cobalt source, an iron source, a carbon source and sodium chloride in deionized water, carrying out magneticstirring to obtain a uniform mixed solution, placing the uniformly-mixed solution into a refrigerator for freezing, and then, carrying out freeze-drying treatment to obtain the precursor powder, wherein a cobalt nitrate hexahydrate is used as the cobalt source, an iron nitrate nonahydrate is used as the iron source, glucosum anhydricum is used as the carbon source, sodium chloride is used as a template, and the molar ratio of Co:Fe:C:NaCl is 0.5:1:20:150; (2) calcining the composite precursor powder; and (3) removing the NaCl template. The three-dimensional carbon network loaded cobalt ferrite nanoparticle composite can be applied to electromagnetic wave absorption.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional carbon network-loaded cobalt ferrite nanoparticle composite material used for electromagnetic wave absorption, and belongs to the field of wave-absorbing materials. Background technique [0002] Due to the widespread use of electronic communication equipment in people's daily life, a large number of electromagnetic waves flood our living space, which not only endangers human health but also interferes with the normal work of other electronic equipment. At present, the problem of electromagnetic pollution is gradually being widely concerned by people. In order to solve the harm caused by electromagnetic radiation, one of the most effective ways is to use electromagnetic wave absorbing materials. The absorbing materials can be divided into structural absorbing materials and coated absorbing materials. Among them, the coated absorbing materials have obtained a large number of applicatio...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 师春生刘振楠何芳赵乃勤何春年刘恩佐马丽颖李群英
Owner TIANJIN UNIV
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