Method for preparing magnetic nano particles of anisotropy cobalt ferrite

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...

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