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A kind of mechanochemical method prepares the method for cobalt ferrite nanoparticle

A technology of cobalt ferrite and nanoparticles, which is applied in the field of spinel-type magnetic cobalt ferrite nanoparticles and its preparation, can solve the problems of high cost, complicated production process, and low yield, and achieve low cost, The effect of less energy consumption and simple preparation method

Inactive Publication Date: 2011-12-14
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these preparation methods, the main problems are that the production process is complicated, the cost is high, and the yield is low, which cannot meet the requirements of industrial production.

Method used

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  • A kind of mechanochemical method prepares the method for cobalt ferrite nanoparticle
  • A kind of mechanochemical method prepares the method for cobalt ferrite nanoparticle
  • A kind of mechanochemical method prepares the method for cobalt ferrite nanoparticle

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) take by weighing cobalt chloride 11.904g, ferric nitrate 10.213g and citric acid 21.206g by the molar ratio of iron and cobalt as 1: 2;

[0021] (2) Pour in an appropriate amount of absolute ethanol, and then add zirconium balls of a certain quality, so that the mass ratio of the ball material is 2:1;

[0022] (3) Set the rotation speed of the planetary mill to 200r / min, grind in the planetary mill for 5 hours, the material undergoes a chemical reaction through mechanical force in the planetary mill, then take out the slurry and dry it at 100°C to obtain a xerogel;

[0023] (4) Put the dry gel into a high-temperature furnace and calcinate it at 500°C for 4 hours to obtain spinel-type magnetic nanoparticles Co 2 Fe0 4 ,Such as figure 2 As shown, the product is in the shape of regular octahedron, and the grain size is about 47.6nm. Figure 5 It is the hysteresis loop of this product, and the saturation magnetization is 26.9emu / g.

Embodiment 2

[0025] (1) take by weighing cobalt chloride 5.965g, ferric nitrate 20.188g and citric acid 21.320g by weighing 2: 1 by the molar ratio of iron and cobalt;

[0026] (2) Pour in an appropriate amount of absolute ethanol, and then add zirconium balls of a certain quality, so that the mass ratio of the ball material is 2:1;

[0027] (3) Set the rotation speed of the planetary mill to 400r / min, grind in the planetary mill for 8h, the material undergoes a chemical reaction through mechanical force in the planetary mill, then take out the slurry and dry it at 100°C to obtain a xerogel;

[0028] (4) Put the dry gel into a high-temperature furnace and calcinate it at 500°C for 4 hours to obtain spinel-type magnetic nanoparticles CoFe 2 o 4 ,Such as image 3 As shown, the product is spherical, and the grain size is about 57nm. Figure 6 It is the hysteresis loop of this product, and the saturation magnetization is 51.3emu / g.

Embodiment 3

[0030] (1) take by weighing cobalt chloride 11.904g, ferric nitrate 20.185g and citric acid 21.324g by the molar ratio of iron and cobalt is 1: 1;

[0031] (2) Pour in an appropriate amount of absolute ethanol, and then add zirconium balls of a certain quality, so that the mass ratio of the ball material is 2:1;

[0032] (3) Set the rotation speed of the planetary mill to 600r / min, grind in the planetary mill for 10 hours, the material undergoes a chemical reaction through mechanical force in the planetary mill, then take out the slurry and dry it at 100°C to obtain a xerogel;

[0033] (4) Put the dry gel into a high-temperature furnace and calcinate it at 500°C for 4 hours to obtain spinel-type magnetic nanoparticles Co 1.5 Fe 1.5 o 4 ,Such as Figure 4 As shown, the product is in the shape of a regular tetrahedron, and the grain size is about 84.5nm. Figure 7 It is the hysteresis loop of the product, and the saturation magnetization is 57.8emu / g.

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Abstract

The invention relates to a method for mechanochemically preparing spinel magnetic cobalt ferrite nanoparticles. The steps of the method are: weighing an appropriate amount of cobalt salt, iron salt and citric acid according to a certain molar ratio, adding an appropriate amount of absolute ethanol to mix evenly, adding zirconium balls, and the mass ratio of the ball material is 2:1; The material is put into a high-energy planetary grinding tank, and ground at 200-600r / min. The material is ground under the action of mechanical force for 5-10 hours to obtain a wet gel. The wet gel is dried at 100°C and placed in a high-temperature furnace. Calcining at 500° C. for 4 hours, the spinel-type magnetic cobalt ferrite nanoparticles can be obtained. The chemical formula of this ferrite is CoxFeyO4, where x+y=3, the average grain size is 40-100 nm, the shape is spherical, regular tetrahedral or regular octahedral, and the saturation magnetization is 25-60 emu / g. The invention has the advantages of simple process, less energy consumption, easy control of production links, and easy realization of industrialized production; it solves the problems of high cost, high energy consumption, complicated process and the like in the prior art.

Description

technical field [0001] The invention belongs to the field of magnetic nanometer materials, and in particular relates to a spinel-type magnetic cobalt ferrite nanoparticle and a preparation method thereof. Background technique [0002] Magnetic cobalt ferrite with spinel structure is an excellent soft magnetic material with unique physical, chemical and magnetic properties. They are often used as magnetic recording materials, stealth absorbing materials, key materials of magnetic refrigeration technology and biomedical materials, etc. They have broad application prospects in the fields of aviation, electronics, metallurgy, chemical industry, biology, medicine and environmental protection. At present, the methods for preparing ferrite mainly include sol-gel method, chemical co-precipitation method, hydrothermal method, solid-phase reaction method, etc. Patent CN101486492A discloses a method for preparing spinel ferrite by chemical co-precipitation method The method is to prec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/626
Inventor 张长森杨磊
Owner YANCHENG INST OF TECH
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