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Method for continuously preparing ferrocobalt nanoparticles with high-ratio saturation magnetization intensity

An iron-cobalt alloy and nanoparticle technology, which is applied in the field of continuous preparation of iron-cobalt alloy nanoparticles, can solve the difficult problems of industrial production of FeCo alloy, and achieve the effect of fast reaction, simple preparation steps, and easy large-scale production

Inactive Publication Date: 2013-03-27
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are limited to a certain extent by multi-step processes such as filtration, washing, calcination, etc., high equipment requirements and energy consumption, and it is difficult to realize the industrial production of FeCo alloys.

Method used

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  • Method for continuously preparing ferrocobalt nanoparticles with high-ratio saturation magnetization intensity
  • Method for continuously preparing ferrocobalt nanoparticles with high-ratio saturation magnetization intensity
  • Method for continuously preparing ferrocobalt nanoparticles with high-ratio saturation magnetization intensity

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Experimental program
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Effect test

Embodiment 1

[0026] Ferrocene and cobalt acetylacetonate were dissolved in a tetrahydrofuran / xylene mixed solvent with a volume ratio of 1:1 to form a precursor solution. Among them, the molar concentration of the metal salt is 0.2mol / L, the molar ratio of Fe and Co is 10:1, and the feed rate is 4ml / min. After the precursor solution is atomized, it is added to the reaction zone where the diffusion flame of hydrogen / air is sent into the auxiliary flame through the injection pump and atomizer, and the combustion pyrolysis reaction is carried out. The reaction process is incomplete combustion, and the temperature of the reaction zone reaches 800°C . 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 product is a hybrid structure of FeCo alloy and C, in which carbon is well coated on the FeCo alloy particles, and the FeCo alloy is dispersed in the In the carbon ma...

Embodiment 2

[0028] Ferrocene and cobalt acetylacetonate are dissolved in a tetrahydrofuran / xylene mixed solvent with a volume ratio of 1:1 (1:5-5:1 is acceptable) to form a precursor solution. The molar concentration of the metal salt is 0.4mol / L, the FeCo molar ratio is 7:3, and the feed rate is 4ml / min. After the precursor solution is atomized, it is added to the reaction zone where the diffusion flame of hydrogen / air is sent into the auxiliary flame through the injection pump and atomizer, and the combustion and pyrolysis reaction is carried out. The reaction process is incomplete combustion, and the temperature of the reaction zone reaches 1000°C . , the thermal decomposition oxidation of the precursor and the formation of the hybrid structure are formed in one step in the high temperature zone of the flame. The obtained product FeCo alloy nanoparticles, the surface passivation forms an oxide-coated core-shell structure, the particle size is 30-80nm, and the oxidation The thickness o...

Embodiment 3

[0030] Ferrocene and cobalt acetylacetonate were dissolved in tetrahydrofuran / xylene mixed solvent with a volume ratio of 2:1 to form a precursor solution. Among them, the molar concentration of the metal salt is 0.4mol / L, the FeCo molar ratio is 7:3, and the feed rate is 4ml / min. After the precursor solution is atomized, it is added to the reaction zone where the diffusion flame of hydrogen / air is sent into the auxiliary flame through the injection pump and atomizer, and the combustion and pyrolysis reaction is carried out. The reaction process is incomplete combustion, and the temperature of the reaction zone reaches 1000°C . 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. The obtained product FeCo alloy nanoparticles, the surface passivation forms an oxide-coated core-shell structure, the particle size is 40-80nm, and the oxide The thickness of the layer is ...

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Abstract

The invention discloses a method for continuously preparing ferrocobalt nanoparticles with high-ratio saturation magnetization intensity. The method comprises the steps of: introducing ferrocene and cobalt acetylacetone, serving as precursors of a metal organic salt, and a mixed solution of tetrahydrofuran and dimethylbenzene, serving as a solvent, into a flame reaction area under the assistance of an injection pump and the atomization diffusion of oxygen via a stainless steel capillary tube; supplying heat energy by means of booster diffusion flame and combustion of a precursor solution to subject a metal organic precursor to thermolysis reaction in a certain length of stainless steel tube reaction chamber at the reaction temperature of 800-1000 DEG C, and obtaining the ferrocobalt nanoparticles under the action of combusting a reducing atmosphere generated during incomplete combustion; and collecting a final product by using a filter bag under the assistance of a vacuum pump, wherein the booster flame is the diffusion flame of hydrogen air. The method disclosed by the invention for continuously preparing the ferrocobalt nanoparticles has the advantages of simple equipment and process, short cycle, high yield, capability of continuous production and easiness for industrial implementation, and is free from any substrates.

Description

technical field [0001] The invention relates to a continuous preparation method of iron-cobalt alloy nanoparticles with high specific saturation magnetization. Background technique [0002] Due to their unique external magnetic field response characteristics, magnetic nanoparticles have broad application prospects in the fields of recyclable noble metal catalysts, magnetic recording and information storage, and environmental governance, especially in biomedicine such as separation of biomacromolecules and targeted drug delivery. , which has received extensive attention from the scientific community. However, the general magnetic metal oxides are constrained by the theoretical value of their own magnetic properties, such as Fe 2 o 3 : 80emu / g, Fe 3 o 4 : 92emu / g, which is greatly restricted in practical application. Magnetic metal particles and metal alloy particles have higher specific saturation magnetization compared to general magnetic metal oxides, especially FeCo a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 李春忠汪志明黄广建李云峰胡彦杰
Owner EAST CHINA UNIV OF SCI & TECH