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Preparation method of magnetic nanoparticle loaded graphene aerogel composite material

A technology of graphene airgel and magnetic nanoparticles, which is applied in the direction of graphene, nanocarbon, chemical instruments and methods, etc., can solve the problem of uneven loading of magnetic particles, insufficient binding force between graphene and magnetic particles, and easy agglomeration of magnetic particles and other problems, to achieve the effect of light weight, low density and deep absorbing strength

Inactive Publication Date: 2018-08-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problems in the prior art that the binding force between graphene and magnetic particles is insufficient, the magnetic particles cannot be evenly loaded on the graphene, and the magnetic particles are easy to agglomerate, etc.

Method used

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  • Preparation method of magnetic nanoparticle loaded graphene aerogel composite material
  • Preparation method of magnetic nanoparticle loaded graphene aerogel composite material
  • Preparation method of magnetic nanoparticle loaded graphene aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Mix 2.0g flake graphite, 46mL concentrated H 2 SO 4 Place in a 500mL three-necked flask, and stir evenly in a mixture of ice and water 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 completed, 100 mL of distilled water was slowly added dropwise, and the reaction was carried out at 90° C. for 0.5 h. Finally, add 100mL distilled water and 15mL 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 prepared to a concentration of 2 mg / mL.

[0030] Step 2: Ultrasonically dissolve 20mL of graphene oxide colloidal suspension and 0.3g of PVA in step 1 until evenly mixed, and mark it as liquid A; take a 150mL beaker, measure 50mL of distilled water into the beaker, and weigh 600mg of...

Embodiment 2

[0033] Step 1: Mix 2.0g flake graphite, 46mL concentrated H 2 SO 4 Place in a 500mL three-necked flask, and stir evenly in a mixture of ice and water 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 completed, 100 mL of distilled water was slowly added dropwise, and the reaction was carried out at 90° C. for 0.5 h. Finally, add 100mL distilled water and 15mL 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 prepared to a concentration of 5 mg / mL.

[0034] Step 2: Dissolve 20mL of graphene oxide colloidal suspension and 0.3g of PVA in step 1 by ultrasonic stirring until evenly mixed, and mark it as liquid A; take a 150mL beaker, measure 50mL of distilled water into the beaker, and weigh ...

Embodiment 3

[0037] Step 1: Mix 2.0g flake graphite, 46mL concentrated H 2 SO 4 Place in a 500mL three-necked flask, and stir evenly in a mixture of ice and water 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 completed, 100 mL of distilled water was slowly added dropwise, and the reaction was carried out at 90° C. for 0.5 h. Finally, add 100mL distilled water and 15mL 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 prepared to a concentration of 3 mg / mL.

[0038] Step 2: Dissolve 20mL of graphene oxide colloidal suspension and 0.4g of PVA in step 1 with ultrasonic stirring until evenly mixed, and mark it as liquid A; take a 150mL beaker, measure 50mL of distilled water into the beaker, and weig...

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Abstract

The invention provides a preparation method of a magnetic nanoparticle loaded graphene aerogel composite material and belongs to the technical field of functional magnetic materials. The method takesgraphene oxide, polyvinyl alcohol and metal salt as raw materials and comprises the following steps: preparing metal salt loaded three-dimensional porous crosslinking network graphene oxide aerogel through a hydrothermal method; freezing and drying, and roasting and reducing under a protection atmosphere to obtain the magnetic nanoparticle loaded graphene aerogel composite material in situ. The preparation method provided by the invention has the advantages of simplicity in operation, low cost and simple preparation technology and is a novel technology for macro preparation of the nanoparticlegraphene aerogel composite material; the magnetic performance and electric performance of the composite material can be adjusted through adjusting the ratio of graphene to the metal salt, and the prepared graphene aerogel composite material has the advantages of high specific surface area, small density, excellent electromagnetic performance and the like and can be used for an electromagnetic wave absorption material.

Description

technical field [0001] The invention belongs to the technical field of functional magnetic materials, and relates to a method for preparing magnetic airgel, in particular to a method for preparing a graphene airgel composite material loaded with magnetic nanoparticles. Background technique [0002] Magnetic nanomaterials are a hot spot in the research of modern wave-absorbing materials because of their advantages of high saturation magnetization and large magnetic permeability. Magnetic nanoparticles play a role in magnetic loss for electromagnetic waves, and mainly exhibit excellent performance at high frequencies. Absorbing properties. Due to the disadvantage of being easy to agglomerate, it is a key technical difficulty to uniformly disperse nano magnetic particles. [0003] Graphene is a one-atom-thick two-dimensional C atom crystal, which is the basic structural unit of fullerene, carbon nanotube and graphite. Because of its large specific surface area, light weight, ...

Claims

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Application Information

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IPC IPC(8): C01B32/184C09K3/00H05K9/00
CPCC01B32/184C01P2004/03C09K3/00H05K9/0081
Inventor 陈平徐东卫熊需海于祺郭翔王琦
Owner DALIAN UNIV OF TECH
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