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A kind of graphene foam loaded nano-fe 3 o 4 Magnetic particle composite absorbing material and preparation method thereof

A composite wave absorbing material, graphene foam technology, applied in chemical instruments and methods, other chemical processes and other directions, can solve the problems that have not been reported yet, and the preparation of 3D graphene-supported magnetic particles is less researched, and achieves a green preparation process. , The effect of excellent absorbing performance and excellent electromagnetic performance

Active Publication Date: 2020-04-07
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the preparation of graphene composite absorbing materials mainly focuses on graphene 2D sheet structure materials, and there are few studies on the preparation of 3D graphene-loaded magnetic particles, especially the research on 3D graphene foam-loaded magnetic particles has not yet been reported.

Method used

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  • A kind of graphene foam loaded nano-fe <sub>3</sub> o <sub>4</sub> Magnetic particle composite absorbing material and preparation method thereof
  • A kind of graphene foam loaded nano-fe <sub>3</sub> o <sub>4</sub> Magnetic particle composite absorbing material and preparation method thereof
  • A kind of graphene foam loaded nano-fe <sub>3</sub> o <sub>4</sub> Magnetic particle composite absorbing material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Step 1: Mix 1.0g flake graphite, 23ml concentrated H 2 SO 4 Place in a 500ml three-necked flask, and stir evenly in an ice-water mixture at 0°C. Weigh 3.0 g of potassium permanganate, add slowly in batches, and control the temperature of the reaction system at 0-10° C. for 1 h. Then the system was moved into a 35°C water bath and reacted for 3h. After the reaction was finished, 50ml of distilled water was slowly added dropwise and reacted at 90°C for 0.5h. Finally, add 100ml of distilled water and 10ml of H 2 o 2 . The product was washed with 5% HCl and distilled water to pH=6-7. The obtained graphite oxide was sonicated into a graphene oxide solution, and configured to a concentration of 5 mg / ml.

[0031] Step 2: 20mL of graphene oxide colloidal suspension in step 1 and 0.3g of PVA are ultrasonically dissolved and mixed evenly, and 80mL of aqueous solution containing 1.5g of ferrous ion particles is injected under the protection of an inert gas, and 25% ammonia ...

Embodiment 2

[0033] Step 1: Mix 2.0g flake graphite, 46ml concentrated H 2SO 4 Place in a 500ml three-necked flask, and stir evenly in an ice-water mixture at 0°C. Weigh 6.0 g of potassium permanganate, add slowly in batches, and control the temperature of the reaction system at 0-10° C. for 1 h. Then the system was moved into a 35°C water bath and reacted for 3h. After the reaction was finished, 100ml of distilled water was slowly added dropwise and reacted at 90°C for 0.5h. Finally, add 100ml of distilled water and 15ml of H 2 o 2 . The product was washed with 5% HCl and distilled water to pH=6-7. The obtained graphite oxide was sonicated into a graphene oxide solution, and configured to a concentration of 5 mg / ml.

[0034] Step 2: 30mL of graphene oxide colloidal suspension in step 1 and 0.3g of PVA are ultrasonically dissolved and mixed evenly, and 80mL of aqueous solution containing 1.5g of ferrous ion particles is injected under the protection of an inert gas, and 25% ammonia ...

Embodiment 3

[0036] Step 1: Put 2.0g of graphite flakes and 46ml of concentrated nitric acid in a 500ml three-neck flask, and stir evenly in a mixture of ice and water at 0°C. Weigh 6.0 g of potassium perchlorate, add it slowly in batches, and control the temperature of the reaction system at 0-10° C. for 1 h. Then the system was moved into a 35°C water bath and reacted for 3h. After the reaction was finished, 100ml of distilled water was slowly added dropwise and reacted at 90°C for 0.5h. Finally, add 100ml of distilled water and 15ml of H 2 o 2 . The product was washed with 5% HCl and distilled water to pH=6-7. The obtained graphite oxide was sonicated into a graphene oxide solution, and configured to a concentration of 3 mg / ml.

[0037] Step 2: 20mL of graphene oxide colloidal suspension in step 1 and 0.3g of PVA are ultrasonically dissolved and mixed evenly, and 80mL of aqueous solution containing 1.8g of ferrous ion particles is injected under the protection of an inert gas, and ...

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Abstract

The invention relates to a graphene foam loaded nano Fe3O4 magnetic particle composite wave-absorbing material and a preparation method thereof. Graphene oxide is prepared according to a Hummers method, graphene oxide colloidal suspension with a certain concentration is prepared, an Fe2+ solution is added, after the pH value of an ammonia-water solution is adjusted, the ammonia-water solution is injected into a reactor, and reaction is carried out under the high-temperature, high-pressure and closed condition. Fe2+ solubility, pH value, reaction time and reaction temperature are adjusted to adjust the foam holes and the wave-absorbing property of a composite material. Graphene in the graphene foam loaded nano Fe3O4 magnetic particle composite wave-absorbing material has a foam multi-hole structure, Fe3O4 magnetic particles are firmly anchored and loaded in the graphene foam structure, and the grain size of Fe3O4 is 150-300 nm. The graphene foam loaded nano Fe3O4 magnetic particle composite wave-absorbing material is high in absorbing strength, wide in wave-absorbing frequency bandwidth, light in weight and good in mechanical property, and is a composite material with excellent performance. Multiple aspects of use requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of functional magnetic materials, and relates to the preparation technology of carbon materials and magnetic particles, in particular to a graphene foam-loaded nano-Fe 3 o 4 Magnetic particle composite wave-absorbing material and its preparation method. Background technique [0002] With the development of military, information, aerospace and other science and technology, electromagnetic absorbing materials have attracted more and more attention. As the basis of stealth technology, microwave-absorbing materials have been paid more and more attention by military researchers in various countries because they can improve the survival, penetration and deep strike capabilities of weapon systems in modern warfare. With the continuous development of stealth technology, the comprehensive requirements of "wide, thin, light, and strong" are put forward for absorbing materials. The development of electromagnetic abso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 陈平徐东卫熊需海于祺郭翔王琦
Owner DALIAN UNIV OF TECH
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