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Method for preparing carbon-coated core-shell nanoparticles continuously

A nano-particle and carbon-coated technology, applied in the direction of coating, etc., can solve the problems of complex follow-up treatment process, extremely small output limit, long reaction time, etc., and achieve the effect of simple equipment process, good crystallinity and wide application prospect

Active Publication Date: 2011-01-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method has high requirements on equipment, complex subsequent treatment process, long reaction time, high energy consumption and extremely small output greatly limit the large-scale continuous production of carbon-coated nanoparticle hybrid materials

Method used

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  • Method for preparing carbon-coated core-shell nanoparticles continuously
  • Method for preparing carbon-coated core-shell nanoparticles continuously
  • Method for preparing carbon-coated core-shell nanoparticles continuously

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Ferrocene was dissolved in a cyclohexane / xylene mixed solvent with a volume ratio of 1:1 (the mass fraction of the metal salt was 2.5%, and the feed rate was 4ml / min), and after atomization, it was added to the reactor for incomplete combustion , the reaction zone temperature reaches 1800°C. In the flame combustion process, by controlling the fuel oxygen ratio Φ to 1.5, a reducing atmosphere is formed inside the reactor, the thermal decomposition and oxidation of the precursor and the carbon coating process are completed simultaneously in the high temperature zone of the flame, and the obtained product is uniformly coated with a carbon layer. Iron ferric oxide nanoparticles coated, wherein the ferric oxide particle diameter is 10-20 nm, and the thickness of the carbon coating layer is 5-10 nm.

Embodiment 2

[0033] Ferrocene was dissolved in a cyclohexane / xylene mixed solvent with a volume ratio of 1:1 (the mass fraction of the metal salt was 2.5%, and the feed rate was 4ml / min), and after atomization, it was added to the reactor for incomplete combustion , the reaction zone temperature reaches 1000°C. In the flame combustion process, by controlling the fuel oxygen ratio Φ to 3.5, the thermal decomposition and oxidation of the precursor and the formation of the hybrid structure are formed in one step in the high temperature zone of the flame, and the obtained products Fe, Fe 3 The hybrid structure of C and C, in which carbon is to Fe and Fe?? 3 C particles are well coated, the particle size is 20-30nm, the thickness of the ordered carbon layer is 4-5 nm, and the product has good superparamagnetism.

Embodiment 3

[0035] Ferrocene was dissolved in a cyclohexane / xylene mixed solvent with a volume ratio of 1:1 (the mass fraction of metal salt was 2.5%, and the feed rate was 4ml / min), and it was atomized and added to the reactor for incomplete combustion , the reaction zone temperature reaches 1400°C. During the flame combustion process, by controlling the fuel oxygen ratio Φ value to 2.5, the thermal decomposition and oxidation of the precursor and the formation of the hybrid structure are formed in one step in the high temperature zone of the flame. Particles, wherein the particle size of iron ferric oxide is 10-20 nm, and the thickness of the carbon coating layer is 5-10 nm.

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Abstract

The invention relates to a method for preparing carbon-coated core-shell nanoparticles continuously, in particular to a method for preparing carbon-coated metallic oxides, carbon-coated metals, carbon-coated metallic carbides and carbon-coated metal alloy nanoparticles continuously. The method comprises the following steps of: in the process of flame combustion, forming a reducing atmosphere of different degrees in a reactor by controlling the fuel oxygen ratio; atomizing organic solvent solution of a metal salt, adding the atomized solution into the reactor to perform incomplete combustion at the temperature of between 1,000 and 1,800 DEG C; and performing thermal decomposition, nucleating, growing and in-situ carbon coating on a precursor at the high temperature a reducing atmosphere ofdifferent degrees to form the carbon-coated core-shell nanoparticles finally. In the obtained core-shell material, the nanoparticles are coated by carbon effectively and have the good heat stability and acid-base stability. Nanometer core-shell structures of the carbon-coated nanoparticles prepared by the method have the advantages of simple equipment process, no need of substrates, large-scale continuous production and easy industrial implementation.

Description

technical field [0001] The invention relates to an in-situ carbon-coated oxide (Fe 3 o 4 @C), carbon-coated metals (Fe@C, Cu@C, Co@C, Ni@C), carbon-coated metal alloys (CoFe@C, CoNiFe@C), and carbon-coated metal carbide nanocores Continuous preparation technology of shell structural materials. Background technique [0002] Carbon-coated nanoparticle hybrid materials have become a research hotspot in the scientific community. Compared with SiO 2 Coating with polymers on nanoparticles, carbon coating not only retains the unique electromagnetic, optical and other properties of nanoparticles, but also endows nanoparticles with good stability, acid and alkali resistance, biocompatibility and surface functionalization. selective. After carbon coating, the nanoparticles can be chemically modified, thereby expanding their applications in the fields of catalysts, biomedicine, and environmental governance. Especially carbon-coated magnetic metal nanoparticles, effective carbon co...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/30C04B35/628
Inventor 胡彦杰李春忠李云峰霍军朝
Owner EAST CHINA UNIV OF SCI & TECH
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