Method for synthesizing high-dispersity magnetic nano ellipsoid

Abstract

The invention discloses a method for synthesizing a high-dispersity magnetic nano ellipsoid. The method comprises the following steps: 1) preparing alpha-Fe2O3 ellipsoid particles; 2) carrying PVP modification and silicon dioxide coating on the apha-Fe2O3 prepared in the 1); and 3) putting the dispersion liquid in the step 2) into hot water for etching to form porous silicon dioxide, collecting and drying; and 4) reducing the particles at 300 DEG C in an H2 atmosphere, and re-dispersing the particles in water to obtain the high-dispersity magnetic nano ellipsoid material. The particle colloid has good dispersity, and the porous silicon dioxide greatly improves the shell permeability. The method has the advantages of energy conservation, high dispersity, porous materials and wide application.

Description

technical field

[0001] The invention belongs to the technical field of materials, in particular to a method for preparing highly dispersed magnetic nano particle materials. Background technique

[0002] The study of anisotropic magnetic nanoparticles with controllable morphology is very interesting and has been widely used in self-assembly, data storage, catalysis, magnetism, smart optical materials, biomedicine and pharmaceuticals. While the direct preparation method is limited, the non-magnetic chemical conversion template method provides an effective route for the synthesis of anisotropic magnetic particles with different morphologies. Unfortunately, transformation methods are often prone to undesirable morphological changes and agglomeration. Preventing structural deformation can be achieved by coating a layer of dense inorganic materials, such as coating a layer of silicon dioxide on a non-magnetic template. The silica shell provides spatial confinement for the transf...

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