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Preparation method for carbon-coated magnetic metal nanoparticle

A magnetic metal nanometer, carbon-wrapped technology, applied in the field of technology, can solve the problems of high energy consumption, high cost, complicated arc method equipment, etc., and achieve the effect of low cost and good guiding significance

Inactive Publication Date: 2015-04-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have their inherent disadvantages. The equipment used in the arc method is relatively complex and expensive, the process parameters are not easy to control, the energy consumption is large, and the cost is high. It is a big challenge to realize mass production.
Compared with the arc discharge method, the cost of the CVD method is lower, and the output and yield are relatively high, but the particle size of the obtained product is uneven, the carbon structure is relatively complex, the preparation process of the precursor is relatively complicated, and the purification process is inconvenient

Method used

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  • Preparation method for carbon-coated magnetic metal nanoparticle
  • Preparation method for carbon-coated magnetic metal nanoparticle
  • Preparation method for carbon-coated magnetic metal nanoparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 5g HSG, 0.5g nickel powder (200 mesh) and 2g dicyandiamide, mix them evenly, and use a press to press the mixed powder to a density of 1.2-1.6g / cm 3 The cylinder is put into a reactor with a volume of 50ml, the valve is closed, the reactor is sealed, and the vacuum degree of extraction is more than 0.08. The electric heating mantle is heated to 200 DEG C to explode, and after stopping the heating, it is naturally cooled, the gas in the reactor is discharged, and the solid product is collected, and the weight of the product obtained is 1.4g. The analysis product is mainly carbon-coated nano-nickel particles ( figure 2 ) and a small amount of nanocarbon ( image 3 ), and partially unwrapped nickel metal. Among them, the yield of carbon-wrapped nickel nanoparticles is 50%, the particle size distribution is 10-40nm, the wrapping layer is graphite layer and amorphous carbon, the metal core is nickel, and no nickel carbide is generated. Figure 4 It is the hysteresi...

Embodiment 2

[0024] Weigh 5g HSG, 0.5g nickel powder (200 mesh) and 5g dicyandiamide, mix evenly, and use a press to compress the mixed powder into a density of (1.2-1.6g / cm 3 ) cylinder, put into a reactor with a volume of 50ml, close the valve, seal the reactor, and draw a vacuum of more than 0.08. The electric heating mantle is heated to 220 DEG C to explode, and after stopping the heating, it is cooled naturally, and the gas in the reactor is discharged, and the solid product is collected, and the gained product weight is 2.2g. The analysis products are mainly carbon-wrapped nano-nickel particles, a small amount of nano-carbon and nanotubes. Among them, the yield of carbon-wrapped nickel nanoparticles is 80%, the particle size distribution is 20-60nm, the wrapping layer is graphite layer, the metal core is nickel, no nickel carbide is formed, and the obtained product has superparamagnetism.

Embodiment 3

[0026] Weigh 5g of Hexogen, 0.5g of nickel powder (200 mesh), 8g of dicyandiamide, mix evenly, and use a press to press the mixed powder into a density of (1.2-1.6g / cm 3 ) into a cylinder with a volume of 100ml, close the valve, seal the reactor, and draw a vacuum of 0.08 or more. The electric heating mantle is heated to 230 DEG C to explode, and after stopping the heating, it is cooled naturally, the gas in the reactor is discharged, and the solid product is collected, and the gained product weight is 2.4g. The analysis products are mainly carbon-coated nano-nickel particles and nanotubes. Among them, the yield of carbon-wrapped nickel nanoparticles is 40%, the particle size distribution is 20-60nm, the wrapping layer is graphite layer, the metal core is nickel, no nickel carbide is formed, and the obtained product has superparamagnetism.

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Abstract

The invention relates to a carbon-coated magnetic metal nanoparticle preparation method, and belongs to the technical field of process technology. The carbon-coated magnetic metal nanoparticle preparation method includes firstly mixing explosives, a metal element and a carbon-containing organic matter to be a reactant; pressing the reactants into a block, then placing into a reactor and then sealing and evacuating the reactor, heating the reactor to a temperature of 200-250 DEG C till an explosion occurs, and finally obtaining the carbon-coated magnetic metal nanoparticles. In preferably step one, the explosives are hexogeon, tetryl or octogen; the metal element is cobalt or nickel, the carbon-containing organic matter is dicyandiamide or melamine. The carbon-coated magnetic metal nanoparticle preparation method has important theoretical significance and practical value for development and application of carbon-coated magnetic nanoparticles, and further has a fine guiding significance for detonation synthetic materials.

Description

technical field [0001] The invention relates to a preparation method of carbon-wrapped magnetic metal nanoparticles, which belongs to the technical field of technology. Background technique [0002] The discovery of fullerenes originally began in the field of astronomy. In 1985, Smalley of Rice University in Houston and Kroto of the United Kingdom used the pyrotechnic method to synthesize C in order to study the structure of interstellar carbon dust. 60 , to obtain its composition and structure. Since then, it has rapidly aroused people's widespread interest and has become a research hotspot. Except C 60 In addition, with a closed cage structure may also have C 28 、C 32 、C 50 、C 70 、C 84 ...C 240 、C 540 , this closed cage structure is collectively called fullerenes. In 1991, Iijima and others discovered carbon nanotubes that could be filled with substances, which aroused great interest of researchers. In 1993, American and Japanese scientists discovered a novel co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02
Inventor 陈鹏万尹昊高鑫陈昂
Owner BEIJING INSTITUTE OF TECHNOLOGYGY