Preparation method of carbon-coated metallic nano-particles

A metal nanoparticle and carbon coating technology, which is applied in the preparation of microspheres and microcapsule preparations, can solve the problems of metal toxicity, limited application, reduced magnetism and dispersibility, and achieve high degree of graphitization and large specific surface area , the effect of simple operation

Inactive Publication Date: 2012-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these nanoparticles have the following outstanding problems: (1) easily oxidized in air; (2) inherently unstable, metal nanoparticles agglomerate in order to reduce their surface energy, thereby reducing their magnetic properties and dispersibility; ( 3) Some metals are toxic, which greatly limits their ap

Method used

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  • Preparation method of carbon-coated metallic nano-particles
  • Preparation method of carbon-coated metallic nano-particles
  • Preparation method of carbon-coated metallic nano-particles

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0029] Example one:

[0030] Weigh 1.2g glucose, 0.808g ferric nitrate and 11.1g NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve into a solution with a magnetic stirrer with a stirring speed of 300r / min, and then use an ultrasonic device with a power of 400W Ultrasound for 15 minutes and mix well. The mixed solution is added to the petri dish, and the petri dish is placed in a vacuum drying oven at 80°C for vacuum drying until the mixture is dried. Grind the mixture, take 2g of the mixed powder and put it in the ark, put the ark into the tube furnace, first pass 200ml / min of Ar inert gas to remove the air, and then use 100ml / min of Ar inert gas at 10℃ / min. The heating rate of min is raised to a temperature of 300°C for carbon source decomposition, after holding for 1h; then the Ar inert gas with a flow rate of 100ml / min is continued to be introduced, and the temperature is raised to a temperature of 700°C at a heating rate of 10°C / min, and holding for 2h...

Example Embodiment

[0031] Embodiment two:

[0032] Weigh 1.2g glucose, 0.808g ferric nitrate and 11.1g NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve into a solution with a magnetic stirrer with a stirring speed of 300r / min, and then use an ultrasonic device with a power of 400W Ultrasound for 15 minutes and mix well. The mixed solution is added to the petri dish, and the petri dish is placed in a vacuum drying oven at 80°C for vacuum drying until the mixture is dried. Grind the mixture, take 2g of the mixed powder and put it in the ark, put the ark into the tube furnace, first pass 200ml / min of Ar inert gas to remove the air, and then use 100ml / min of Ar inert gas at 10℃ / min. The heating rate of min is increased to 300°C for carbon source decomposition, after holding for 1h; then, Ar inert gas with a flow rate of 100ml / min is continued to be introduced, and the temperature is raised to a temperature of 750°C at a heating rate of 10°C / min, and holding for 2h Carbonizatio...

Example Embodiment

[0033] Embodiment three:

[0034] Weigh 1.2g glucose, 0.808g ferric nitrate and 11.1g NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve into a solution with a magnetic stirrer with a stirring speed of 300r / min, and then use an ultrasonic device with a power of 400W Ultrasound for 15 minutes and mix well. The mixed solution is added to the petri dish, and the petri dish is placed in a vacuum drying oven at 80°C for vacuum drying until the mixture is dried. Grind the mixture, take 2g of the mixed powder and put it in the ark, put the ark into the tube furnace, first pass 200ml / min of Ar inert gas to remove the air, and then use 100ml / min of Ar inert gas at 10℃ / min. The heating rate of min is raised to 300℃ for carbon source decomposition, after holding for 1h; then the Ar inert gas with a flow rate of 100ml / min is continued to flow, and the temperature is raised to 800℃ at a heating rate of 10℃ / min, and the temperature is kept for 2h. Carbonization, after t...

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Abstract

The invention discloses a preparation method of carbon-coated metallic nano-particles, which comprises the steps that: NaCl serves as dispersant and a carrier, and is fully mixed with a metal source and a solid carbon source; the mixed solution is dried under a vacuum condition, and mixture is obtained; the mixture is put into a tubular furnace and calcinated in the inertial/reduction atmosphere, and a calcinated product is obtained; and the calcinated product is washed and ground, and the carbon-coated metallic nano-particles are obtained. The method is safe, non-toxic, environmental-friendly and simple to operate, so that the grain sizes of the prepared carbon-coated nano-particles are controlled to be 0nm to 100nm, the graphitization degree of a carbon layer is high, the dispersion of the particles is good, and the yield is high. The carbon-coated metallic nano-particles which are prepared through the preparation method have better magnetism and larger specific surface areas, can be used for electronic and magnetic materials, and can be used for magnetic resonance imaging, targeted drug transportation and other fields through functionalization treatment and other steps.

Description

technical field [0001] The invention relates to a preparation method of carbon-coated metal nanoparticles, which belongs to the composite material technology of carbon and metal. Background technique [0002] Nanocomposites are very important nanomaterials, among which magnetic nanocomposites have received extensive attention and research in recent years. The carbon-coated metal magnetic nanocomposites with core-shell structure realize the multifunctionality and separability of the material. The carbon-coated metal nanoparticles are composed of a magnetic metal nano-core and an inert cladding layer (C layer). [0003] Magnetic metal nanoparticles have broad application prospects in the fields of magnetic fluids, catalysts, biotechnology / biomedical medicine, electromagnetic wave absorption, magnetic recording / thermotherapy, magnetic resonance imaging, and targeted drug delivery. However, these nanoparticles have the following outstanding problems: (1) easily oxidized in air...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 何春年吴珊赵乃勤师春生刘恩佐
Owner TIANJIN UNIV
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