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Preparation method of environment-friendly Fe@C composite wave-absorbing material

A composite wave-absorbing material, an environment-friendly technology, applied in the field of wave-absorbing materials, can solve problems such as applications that are rarely reported, achieve excellent wave-absorbing performance, and avoid pollution effects

Active Publication Date: 2021-01-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Materials such as polylactic acid, chitosan, and cellulose are biodegradable materials with excellent biodegradation properties, but their applications in the field of microwave absorption are rarely reported.

Method used

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  • Preparation method of environment-friendly Fe@C composite wave-absorbing material
  • Preparation method of environment-friendly Fe@C composite wave-absorbing material
  • Preparation method of environment-friendly Fe@C composite wave-absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Synthetic Fe 2 o 3 Nanoparticles: Weigh 2mmol Fe(NO 3 ) 3 9H 2 O, dissolved in 72mL deionized water, then added 10mmol urea, stirred at constant temperature until it was completely dissolved, then transferred the mixed solution to a 100mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction, the reaction temperature was 120°C, and the reaction time was 12h After the reaction, the precipitate was collected by centrifugation and washed, and dried under vacuum at 40°C to obtain Fe 2 o 3 Nanoparticles;

[0049] Synthesis of Fe@C composites: take the Fe obtained in the previous step 2 o 3 Ultrasonic dispersion of 50 mg of nanoparticles in 80 mL of deionized water, adding 75 mg of Tris base to form a buffer solution, adjusting the pH of the solution to 8.5, then adding 120 mg of dopamine, stirring for 5 hours, and centrifuging and washing for 4 times until the filtrate is clear, vacuum dried at 40 °C and placed in a tube Annealing in a type furnace,...

Embodiment 2

[0052] Synthetic Fe 2 o 3 Nanoparticles: Weigh 2mmol Fe(NO 3 ) 3 9H 2 O, dissolved in 72mL deionized water, then added 10mmol urea, stirred at constant temperature until it was completely dissolved, then transferred the mixed solution to a 100mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction, the reaction temperature was 120°C, and the reaction time was 12h After the reaction, the precipitate was collected by centrifugation and washed, and dried under vacuum at 40°C to obtain Fe 2 o 3 Nanoparticles;

[0053] Synthesis of Fe@C composites: take the Fe obtained in the previous step 2 o 3 Ultrasonic dispersion of 50 mg of nanoparticles in 80 mL of deionized water, adding 75 mg of Tris base to form a buffer solution, adjusting the pH of the solution to 8.5, then adding 120 mg of dopamine, stirring for 5 hours, and centrifuging and washing for 4 times until the filtrate is clear, vacuum dried at 40 °C and placed in a tube Annealing in a type furnac...

Embodiment 3

[0056] Synthetic Fe 3 o 4 Nanoparticles: weigh 2mmolFeCl 3 ·6H 2 O and 10mmol urea were dissolved in 72mL absolute ethanol. Then the mixed solution was transferred to a 100 mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction at a reaction temperature of 200° C. and a reaction time of 12 h. After the reaction is finished, cool to room temperature naturally, collect the black product, wash it several times with distilled water and absolute ethanol, and dry it under vacuum at 60°C for 20 hours to obtain Fe 3 o 4 Nanoparticles;

[0057] Synthesis of Fe@C composites: take the Fe obtained in the previous step 3 o 4 Ultrasonic dispersion of 50 mg of nanoparticles in 80 mL of deionized water, adding 75 mg of Tris base and 120 mg of dopamine, stirring for 5 hours, centrifugation and washing for 4 times until the filtrate is clear, vacuum dried at 40 °C and placed in a tube furnace for annealing, the annealing temperature is 600 °C, The heating rate is 2...

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Abstract

The invention discloses a preparation method of an environment-friendly Fe@C composite wave-absorbing material, which comprises the following steps of dissolving urea and ferric salt in a solvent, andstirring until the urea and ferric salt are fully dissolved, transferring the mixed solution into a polytetrafluoroethylene stainless steel reaction kettle for hydrothermal reaction, and after the reaction is finished, centrifugally washing and drying to obtain iron oxide nanoparticles for later use, ultrasonically dispersing the synthesized nanoparticles into deionized water, adding Tris base and dopamine hydrochloride, and stirring for several hours, after centrifugal cleaning and drying, putting an obtained product into a tubular furnace for annealing, and compounding the collected annealing product with a degradable material to obtain the iron-coated carbon composite wave-absorbing material. The preparation method is simple, the preparation process is green and pollution-free, and theproduct is degradable. The prepared material has excellent wave-absorbing performance, can be degraded after being used, avoids environmental pollution in the preparation and use processes, and is expected to be applied to the field of wave absorption.

Description

technical field [0001] The invention relates to a wave-absorbing material technology, in particular to a preparation method of an environment-friendly Fe@C composite wave-absorbing material. Background technique [0002] In recent years, with the rapid development and popularization of technologies such as communications, military and commercial radar systems, the problem of electromagnetic interference has become increasingly serious. Electromagnetic wave pollution not only affects information security, but also endangers human health, so it has attracted more and more attention. Microwave absorbing materials can convert electromagnetic energy into heat energy, which can effectively solve the problem of electromagnetic radiation. Therefore, the preparation of light, thin and strong microwave absorbing materials has extremely high application value. [0003] At present, materials that can be used for microwave absorption include carbon materials, metals and alloys, metal ox...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08K9/10C08K3/04C08K3/08C08L5/08C08L67/04C09K3/00
CPCC08K9/10C08K3/04C08K3/08C09K3/00C08K2003/0856C08L2201/06C08L1/02C08L5/08C08L67/04
Inventor 刘庆伟曾敏刘珏于荣海
Owner BEIHANG UNIV