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Preparation method of wave absorbing material with nickel nanoparticles wrapped with porous carbon-loaded graphene

A graphene-coated, microwave-absorbing material technology, applied in nanotechnology, chemical instruments and methods, transportation and packaging, etc., can solve the problems of high cost, high cost of composite materials and difficulty in popularization and application, and achieve low cost and high microwave absorption performance, large area effect

Active Publication Date: 2017-04-19
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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  • Preparation method of wave absorbing material with nickel nanoparticles wrapped with porous carbon-loaded graphene
  • Preparation method of wave absorbing material with nickel nanoparticles wrapped with porous carbon-loaded graphene
  • Preparation method of wave absorbing material with nickel nanoparticles wrapped with porous carbon-loaded graphene

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-supported graphene-coated nano-nickel part...

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

The invention provides a preparation method of a wave absorbing material with nickel nanoparticles wrapped with porous carbon-loaded graphene. The preparation method of the wave absorbing material with the nickel nanoparticles wrapped with the porous carbon-loaded graphene comprises the steps that alga are used as a carbon source and soaked in a nickel saline solution, and nickel ions are made to enter algal cells; low-temperature heat treatment is conducted on the alga after the alga are frozen and dried, so that the alga are converted into carbon, and metallic nickel slat is oxidized into nickel oxide; and then the temperature is increased to continue to conduct high-temperature heat treatment, so that the nickel oxide is reduced into nickel, the amorphous carbon wrapping the nickel nanoparticles is catalyzed and graphitized in the heat treatment process, and finally the composite material with the nickel nanoparticles wrapped with the porous carbon-loaded graphene is obtained. According to the preparation method of the wave absorbing material with the nickel nanoparticles wrapped with the porous carbon-loaded graphene, the alga are used as the carbon source, and thus the preparation method is economical and practical; nickel is evenly dispersed onto a carbon material by means of the characteristic that holes of natural algal plants are abundant; a porous carbon material of a network structure is obtained after heat treatment, the nickel particles wrapped with the graphene are dispersed on the surface of the porous carbon material, and thus the material has excellent micro-wave absorption performance.

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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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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