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A kind of preparation method of carbon-coated bismuth nanocomposite material

A composite material, bismuth nanotechnology, applied in the direction of chemical instruments and methods, offensive equipment, compressed gas generation, etc., can solve the problems of simple nano-bismuth composite materials that have not been reported in the literature, and achieve simple operation, easy-to-obtain raw materials, and particle size Effects with controllable size

Inactive Publication Date: 2018-08-14
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Bismuth elemental nanomaterials include nanotubes, nanoparticles, etc. As far as the inventors know, the elemental nanobismuth composite material coated with pomegranate carbon has not been reported in the literature

Method used

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  • A kind of preparation method of carbon-coated bismuth nanocomposite material
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  • A kind of preparation method of carbon-coated bismuth nanocomposite material

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Experimental program
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Effect test

Embodiment 1

[0033] Dissolve 0.6 g of glucose, 0.2 g of bismuth nitrate pentahydrate, and 0.1 g of polyvinylpyrrolidone (K-30) in 2 mL of deionized water, then add 1 mL of glacial acetic acid, transfer it to the reactor, and react at 200 °C for 1 Hours, naturally cooled to room temperature, centrifuged, washed with deionized water and absolute ethanol three times, dried and ground to obtain brown-black carbon-coated bismuth nanocomposites. Its TEM image is shown in figure 1 , it can be seen from the figure that the product is a pomegranate-like core-shell structure with an outer diameter of about 600nm, and multiple bismuth spheres are coated in a porous carbon shell with a thickness of about 100nm; among them, some bismuth spheres overflow from the carbon shell The remaining on the surface of the carbon shell is due to the diffusion of part of the bismuth element from the porous carbon shell. Its SEM image is shown in figure 2 , it can be seen from the figure that the surface of the pa...

Embodiment 2

[0035] Dissolve 0.6 g of gum arabic, 0.1 g of bismuth nitrate pentahydrate, and 0.15 g of polyvinylpyrrolidone (K-30) in 2 mL of deionized water, then add 1 mL of glacial acetic acid, transfer it to a reaction kettle, and heat at 200 °C React for 4 hours, naturally cool to room temperature, centrifuge, wash with deionized water and absolute ethanol three times, dry and grind to obtain a brown-black carbon-coated bismuth nanocomposite. Its TEM image is shown in Figure 5 , it can be seen from the figure that the product is a pomegranate-shaped core-shell structure with an outer diameter of about 700nm, and multiple bismuth spheres are coated in a porous carbon shell, and the carbon shell is relatively thick. Its SEM image is shown in Image 6 , it can be seen from the figure that the particle size is about 700nm and the surface is smooth.

Embodiment 3

[0037] Dissolve 0.6 g of chitosan oligosaccharides, 0.2 g of bismuth nitrate pentahydrate, and 0.1 g of polyvinylpyrrolidone (K-30) in 2 mL of deionized water, then add 1 mL of glacial acetic acid, transfer it to the reaction kettle, and React at 200°C for 2 hours, cool naturally to room temperature, centrifuge, wash with deionized water and absolute ethanol three times, dry and grind to obtain a brown-black carbon-coated bismuth nanocomposite. Its TEM image is shown in Figure 7 , it can be seen from the figure that the product is a pomegranate-shaped core-shell structure with an outer diameter of about 550nm, and multiple bismuth spheres are wrapped in the carbon shell. Its SEM image is shown in Figure 8 , it can be seen from the figure that the particle size is about 550nm and the surface is rough.

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Abstract

The invention discloses a pomegranate carbon-coated bismuth nanocomposite material and a preparation method thereof. The specific steps are to dissolve water-soluble sugars, bismuth nitrate and polyvinylpyrrolidone in water in a closed container, and then add organic acid. React at 160℃~260℃, and obtain pomegranate carbon-coated bismuth nanocomposite after washing and drying. The invention obtains a pomegranate-shaped carbon-coated bismuth nanocomposite material with multiple bismuth spheres embedded inside the carbon shell. The material has an obvious catalytic effect on the thermal decomposition of RDX, and can advance its thermal decomposition peak temperature by 30 to 47%. ℃, can be used as propellant combustion catalyst.

Description

technical field [0001] The invention relates to a preparation method of a pomegranate carbon-coated bismuth nanocomposite material and its application as a combustion catalyst in the field of solid propellants. Background technique [0002] Carbon-coated metal nanoparticles are nanomaterials filled with metal particles in carbon particles. It has a unique structure and many exotic physical and chemical properties. It has shown great potential application value in many scientific and technological fields. In recent years, it has gradually become a domestic A research hotspot of foreign concern. At present, the more common methods for preparing carbon-coated nanomaterials include arc method, laser method, ion beam method, CVD method, organic matter pyrolysis method, ball milling method, hydrothermal method, etc. Due to the difference in reaction mechanism, the preparation process and The nature of the product also varies. [0003] Bismuth elemental nanomaterials include nano...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26C06D5/00
Inventor 崔成梅党桃桃耿艳敏谢钢陈三平
Owner NORTHWEST UNIV
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