A preparation method of porous carbon-loaded graphene-coated nano-nickel particle absorbing material

A graphene-coated, microwave-absorbing material technology, applied in nanotechnology, chemical instruments and methods, transportation and packaging, etc., can solve the problems of high price, high cost of composite materials and difficult to popularize and apply, and achieve low cost and improve microwave absorption. Performance, effect of high specific surface area

Active Publication Date: 2018-11-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned methods for preparing graphene / nano-nickel composite materials all use expensive and complex graphene as raw materials, which makes the cost of composite materials difficult to popularize and apply.

Method used

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  • A preparation method of porous carbon-loaded graphene-coated nano-nickel particle absorbing material
  • A preparation method of porous carbon-loaded graphene-coated nano-nickel particle absorbing material
  • A preparation method of porous carbon-loaded graphene-coated nano-nickel particle absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Prepare a nickel nitrate solution with a concentration of 0.05 mol / L, select 20 g of natural algae plants, and soak the algae in the prepared nickel nitrate solution for 24 hours. Wherein, the natural algae plant is laver.

[0025] Step 2: crush the soaked algae with a mixer, centrifuge and take the centrifuged product for freeze-drying, and after it is completely dry, pulverize and grind to obtain powder sample A.

[0026] Step 3: Weigh an appropriate amount of sample A, place it in a vacuum reaction furnace, and heat it at 200°C for 30 minutes to obtain sample B.

[0027] Step 4: Weigh an appropriate amount of sample B, place it in a vacuum reaction furnace, and heat it at 300°C for 30 minutes to obtain sample C.

[0028] Step 5: Weigh an appropriate amount of sample C, place it in a high-temperature tube furnace, and heat it for 30 minutes at 500°C under an argon atmosphere to obtain a porous carbon-loaded graphene-coated nano-nickel particle absorbing mater...

Embodiment 2

[0031] Step 1: Prepare a nickel nitrate solution with a concentration of 0.05 mol / L, select 20 g of natural algae plants, and soak the algae in the prepared nickel nitrate solution for 24 hours. Among them, the natural algae plant is Porphyridium coccus.

[0032] Step 2: crush the soaked algae with a mixer, centrifuge and take the centrifuged product for freeze-drying, and after it is completely dry, pulverize and grind to obtain powder sample A.

[0033] Step 3: Weigh an appropriate amount of sample A, place it in a vacuum reaction furnace, and heat it at 200°C for 30 minutes to obtain sample B.

[0034] Step 4: Weigh an appropriate amount of sample B, place it in a vacuum reaction furnace, and heat it at 350°C for 30 minutes to obtain sample C.

[0035] Step 5: Weigh an appropriate amount of sample C, place it in a high-temperature tube furnace, and heat it for 30 minutes at 500°C under an argon atmosphere to obtain a porous carbon-loaded graphene-coated nano-nickel particl...

Embodiment 3

[0038] Step 1: Prepare a nickel nitrate solution with a concentration of 0.10 mol / L, select 20 g of natural algae plants, and soak the algae in the prepared nickel nitrate solution for 24 hours. Among them, the natural algae plant is Ulva.

[0039] Step 2: crush the soaked algae with a mixer, centrifuge and take the centrifuged product for freeze-drying, and after it is completely dry, pulverize and grind to obtain powder sample A.

[0040] Step 3: Weigh an appropriate amount of sample A, place it in a vacuum reaction furnace, and heat it at 250°C for 30 minutes to obtain sample B.

[0041] Step 4: Weigh an appropriate amount of sample B, place it in a vacuum reaction furnace, and heat it at 400°C for 30 minutes to obtain sample C.

[0042] Step 5: Weigh an appropriate amount of sample C, place it in a high-temperature tube furnace, and heat it for 30 minutes at 600°C under an argon atmosphere to obtain a porous carbon-supported graphene-coated nano-nickel particle absorbing ...

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Abstract

A method for preparing a porous carbon-loaded graphene-coated nano-nickel particle wave-absorbing material, using algae as a carbon source, soaking it in a nickel salt solution, so that nickel ions enter the algae cells. After freeze-drying, it is subjected to low-temperature heat treatment, and the algae are converted into carbon, and the metal nickel salt is oxidized to nickel oxide; then the temperature is raised to continue high-temperature heat treatment, so that the nickel oxide is reduced to nickel, and the coating on the nickel nanometer is realized during the heat treatment process. The granular amorphous carbon is catalyzed and graphitized, and finally a composite material of porous carbon-supported graphene-coated nano-nickel particles is obtained. The invention uses algae as a carbon source, which is economical and practical, and uses the characteristics of rich pores in natural algae plants to uniformly disperse nickel on the carbon material; after heat treatment, a porous carbon material with a network structure is obtained, and the nickel particles coated with graphene are dispersed in the porous carbon material. The surface of the carbon material makes the material have excellent microwave absorption properties.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite material preparation, and relates to a preparation method of a porous carbon-loaded graphene-coated nano-nickel particle wave-absorbing material. Background technique [0002] Nickel nanoparticles have attracted enough attention in microwave applications because of their high saturation magnetization and magnetic permeability. These materials have high complex permeability, adjustable resonance frequency, and low eddy current loss in the microwave range, and are expected to become high-density recording media, magnetic field sensors, or electromagnetic wave absorbing materials. However, the large specific surface area and high reactivity of nickel nanoparticles are easy to cause agglomeration and oxidation, and the density is high, so they are not suitable for direct application. Graphene, as a single electrical loss material, is difficult to make absorbing materials with a wide absorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/30B22F1/02B82Y40/00C09K3/00
CPCC09K3/00B82Y40/00B22F9/30B22F2999/00B22F1/16B22F2201/02B22F2201/11
Inventor 李翠艳畅丽媛欧阳海波黄剑锋费杰孔新刚黄启高
Owner SHAANXI UNIV OF SCI & TECH
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