Method for preparing nano-particles of magnetic ferric oxide

Abstract

The invention relates to a method for preparing magnetic ferric oxide nano particle, belonging to the technological field for preparing inorganic non-metal magnetic nano material. The invention prepares ª†-Fe2O3 nano particle in stick shape and cubicalª†-Fe2O3 nano particle with the grain size being 20 nm under lower temperature by using the action of particular organic additive and inorganic salt and employing ferric iron salt as raw material without the oxidation-reduction course. The invention is characterized by simple process and easy to control the particle shape.

Description

technical field

[0001] The present invention relates to a preparation method of magnetic iron oxide nanoparticles, to be precise, relates to a rod-shaped or cubic γ-Fe 2 o 3 A method for preparing nanoparticles belongs to the technical field of preparation of inorganic non-metallic magnetic nanometer materials. Background technique

[0002] γ-Fe 2 o 3 Due to its excellent magnetic properties, powder was first used as a magnetic recording material, and it also plays an extremely important role in many other applications. γ-Fe 2 o 3 Nanoparticles have broad application prospects in magnetic fluids, magnetic refrigeration, biomedicine, and information storage.

[0003] Traditional preparation of γ-Fe 2 o 3 The powder method usually includes five steps: (1) preparation of α-FeOOH needle crystal seeds; (2) growing crystal α-FeOOH on the seeds; (3) dehydration of α-FeOOH into α-FeOOH by heating 2 o 3 ; (4) α-Fe 2 o 3 reduced to Fe 3 o 4 ; (5) ...

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