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Method for preparing glucosyl mesoporous carbon-coated ZnFeO used for electromagnetic wave absorbing coating

A glucose-based mesoporous technology is applied in the field of electromagnetic wave absorption coating preparation, which can solve the problems of enhanced electromagnetic wave absorption and complex purification process.

Inactive Publication Date: 2010-12-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation and purification process of carbon nanotubes is relatively complicated, and surface modification is required to increase the filling rate, which is expected to further enhance electromagnetic wave absorption

Method used

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  • Method for preparing glucosyl mesoporous carbon-coated ZnFeO used for electromagnetic wave absorbing coating
  • Method for preparing glucosyl mesoporous carbon-coated ZnFeO used for electromagnetic wave absorbing coating
  • Method for preparing glucosyl mesoporous carbon-coated ZnFeO used for electromagnetic wave absorbing coating

Examples

Experimental program
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Effect test

specific Embodiment 1

[0013] Preparation of glucose-based mesoporous carbon-coated ZnFeO materials with a molar ratio of Zn and Fe of 0:1 and heat treatment at 500 °C after glucose coating

[0014] (1) 2.70g FeCl 3 ·6H 2 O was dissolved in 80 mL of ethylene glycol to form a clear solution. Add 7.2g of sodium acetate and 2.0g of polyethylene glycol PEG2000 to it, and stir vigorously for 6h.

[0015] (2) Encapsulate the reaction mixture into a polytetrafluoroethylene kettle, and perform solvothermal reaction at 200° C. for 12 hours.

[0016] (3) The obtained product was separated by centrifugation, washed three times with distilled water and ethanol, and dried under vacuum at 60°C. The resulting sample is denoted as ZnFeO (0:1), where (0:1) is the molar ratio of Zn and Fe.

[0017] (4) Take 0.5 g of ZnFeO particles, add it to 80 mL of glucose solution (0.5 M), and disperse it by ultrasonic wave for 30 min.

[0018] (5) Pour the mixture into a hydrothermal reaction kettle, and conduct a hydrother...

specific Embodiment 2

[0022] Preparation of glucose-based mesoporous carbon-coated ZnFeO materials with a molar ratio of Zn and Fe of 1:2 and heat treatment at 500 °C after glucose coating

[0023] (1) 5.40g FeCl 3 ·6H 2 O and 1.36 g ZnCl 2 Dissolve in 80mL ethylene glycol to form a transparent solution. Add 7.2g of sodium acetate and 2.0g of polyethylene glycol PEG2000 to it, and stir vigorously for 6h.

[0024] (2) Encapsulate the reaction mixture into a polytetrafluoroethylene kettle, and perform solvothermal reaction at 200° C. for 12 hours.

[0025] (3) The obtained product was separated by centrifugation, washed three times with distilled water and ethanol, and dried under vacuum at 60°C. The obtained sample is recorded as ZnFeO (1:2), (1:2) being the molar ratio of Zn and Fe.

[0026] (4) Take 0.5 g of ZnFeO particles, add it to 80 mL of glucose solution (0.5 M), and disperse it by ultrasonic wave for 30 min.

[0027] (5) Pour the mixture into a hydrothermal reaction kettle, and conduc...

specific Embodiment 3

[0031] Preparation of glucose-based mesoporous carbon-coated ZnFeO materials with a molar ratio of Zn and Fe of 1:1 and heat treatment at 500 °C after glucose coating

[0032] (1) 2.70g FeCl 3 ·6H 2 O and 1.36 g ZnCl 2 Dissolve in 80mL ethylene glycol to form a transparent solution. Add 7.2g of sodium acetate and 2.0g of polyethylene glycol PEG2000 to it, and stir vigorously for 6h.

[0033] (2) Encapsulate the reaction mixture into a polytetrafluoroethylene kettle, and perform solvothermal reaction at 200° C. for 12 hours.

[0034] (3) The obtained product was separated by centrifugation, washed three times with distilled water and ethanol, and dried under vacuum at 60°C. The obtained sample is recorded as ZnFeO (1:1), where (1:1) is the molar ratio of Zn and Fe.

[0035] (4) Take 0.5 g of ZnFeO particles, add it to 80 mL of glucose solution (0.5 M), and disperse it by ultrasonic wave for 30 min.

[0036] (5) Pour the mixture into a hydrothermal reaction kettle, and con...

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Abstract

The invention discloses a method for preparing glucosyl mesoporous carbon-coated ZnFeO used for electromagnetic wave absorbing coating, which belongs to the preparation process of the electromagnetic wave absorbing coating. In the method, a carbon-coated layer is formed on the surface of Zn ferrite by combining a solvothermal method and high-temperature calcination, which cannot only improve the monodispersion and stability of the ferrite and reduce the density of the ferrite, but also increase the effective absorption of electromagnetic wave, be favorable for expanding absorbing frequency range and fulfill the aims of 'thinness, lightness, wideness and rigidness'. The method is widely used for civil and military use and is more practical.

Description

technical field [0001] The invention relates to a preparation technology of glucose-based mesoporous carbon-coated ZnFeO used in electromagnetic wave absorbing coatings, and belongs to the technical field of electromagnetic wave absorbing coating preparation. technical background [0002] Zinc ferrite material is a material with a large loss tangent value. It not only has a high electrical loss rate, but also absorbs and attenuates electromagnetic waves through magnetic polarization mechanisms such as hysteresis loss, domain wall resonance and aftereffect loss. It is widely used in the field of electromagnetic absorbing materials. Composite zinc ferrite is usually made by doping metal elements in order to broaden its absorption band, but the disadvantage of high ferrite density cannot be avoided. [0003] Combining ferrite with light-weight dielectric loss absorbing material not only has multiple absorbing properties, but also can further reduce the density of the material....

Claims

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Application Information

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IPC IPC(8): C09D5/32C04B41/85
Inventor 王涛周建华何建平郭云霞赵建庆吴士超丁晓春
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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