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Method for preparing magnetic nano particles of anisotropy cobalt ferrite

A technology of magnetic nanoparticles and cobalt ferrite, which is applied in the direction of the magnetism of inorganic materials, can solve the problems of preparing single-phase nano-cobalt ferrite particles, and achieve the effect of complete crystallization and improved performance

Inactive Publication Date: 2007-11-14
SHANGHAI UNIV
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Problems solved by technology

[0003] The preparation method of cobalt ferrite is traditionally conventional ball milling sintering process, coprecipitation method, sol-gel method, hydrothermal method, etc. Although these methods can prepare nano-scale cobalt ferrite powder or its precursor , but it is still difficult to prepare single-phase nano-cobalt ferrite particles with anisotropic shape in one step

Method used

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  • Method for preparing magnetic nano particles of anisotropy cobalt ferrite

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Embodiment 1

[0019] Using analytically pure cobalt sulfate and ferric nitrate as raw materials, they are prepared into solutions of 0.5mol / L and 1mol / L respectively, measure 50ml of nickel sulfate solution and 50ml of ferric nitrate solution, put the above two solutions into a beaker, and then Add 100ml of sodium hydroxide solution with a precipitating agent concentration of 2mol / L, stir with a magnetic stirrer at room temperature for 5 minutes to make it evenly mixed, then heat to 60°C, stir to make it fully react, the cobalt and iron ions in the solution A co-precipitate of cobalt hydroxide and iron hydroxide will precipitate, forming a suspension. Then this suspension is poured in the quartz glass vessel of a strong magnetic field reactor, and this quartz glass vessel is placed in the heating device under strong magnetic field; The magnetic induction intensity of strong magnetic field is 8T (Tesla), and suspension is in Heating treatment in a strong magnetic field for 2 hours, the heati...

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Abstract

This invention involves an anisotropic cobalt ferrite magnetic nanoparticle for the preparation methods and devices, nano-magnetic material is a preparation of technical fields. The characteristics of the present invention are to co-precipitation - Preparation phase transformation process of nano-cobalt ferrite placed in a strong magnetic field in a reactor. Will ion containing cobalt and iron ions in the mixture solution by adding containers of sodium hydroxide precipitation, stirring mixture with magnetic stirrer, and 60 Deg.C to respond fully, cobalt hydroxide by ferric hydroxide precipitation and the suspension and then transfer its Xeon magnetic field reactor, the strong magnetic field of magnetic field intensity of 6 to 7 T, slurry temperature is 60 to 95 Deg.C, in strong magnetic field heat treatment two hours, then pumped filter isolated precipitation powder, The cobalt ferrite particles have excellent magnetic properties.

Description

technical field [0001] The invention relates to a preparation method of anisotropic cobalt ferrite magnetic nano particles and a special device thereof, belonging to the technical field of magnetic nano material preparation technology. Background technique [0002] Cobalt ferrite (COFe 2 o 4 ) has high saturation magnetization, residual magnetic strength, large coercive force, and good mechanical properties and chemical stability. These properties make cobalt ferrite widely used in the fields of magnetic recording, sensor devices, and magnetic fluids. application. Cobalt ferrite is the only spinel ferrite with a positive magnetocrystalline anisotropy constant, and its magnetic properties are greatly affected by its particle size and morphology. With the reduction of cobalt ferrite particle size and the enhancement of shape anisotropy, its magnetic properties and other physical and chemical properties are also significantly improved, and the recording density and signal-to...

Claims

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Application Information

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IPC IPC(8): H01F1/11C04B35/32C04B35/622
Inventor 钟云波桂林阳祥富任忠鸣
Owner SHANGHAI UNIV
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