Method for preparing gamma-Fe2O3 magnetic nano-particles

Abstract

The invention discloses a method for preparing gamma-Fe2O3 magnetic nano-particles. The method comprises the steps that Fe3+ salt is directly dissolved in dimethylformamide (DMF), the amount of the Fe3+ salt does not exceed the amount of saturated solubility thereof in the DMF, the mixture is evenly stirred into a transparent solution, and then the solution is sintered for 1-4 hours at the temperature of 150-280 DEG C, so that gamma-Fe2O3 magnetic nano-particles are obtained. The method for preparing gamma-Fe2O3 magnetic nano-particles overcomes the defects of tedious process, complex post processing and the like in the prior art, the pH value does not need to be adjusted in the whole preparation process, washing and filter are not needed, no assistant agent or surface active agent is needed, and the method has the advantages of being high in production rate, high in yield and benefit, and capable of achieving large-batch industrial production.

Description

technical field [0001] The present invention relates to a kind of manufacture method of nanometer material, the present invention relates to a kind of gamma-Fe specifically 2 o 3 Preparation method of nanoparticles. Background technique [0002] The unique magnetic and electronic properties of magnetic nanoparticles have shown good application prospects in magnetic sensitive devices, microwave coatings, biomedicine and other chemical catalysis industries. Among many nanomaterials, γ-Fe 2 o 3 It has attracted much attention because of its good weather resistance, light resistance, magnetism, and good absorption and shielding effects on ultraviolet rays. It can be widely used in flash coatings, automotive topcoats, electronics, high magnetic recording materials, and gas sensors. , catalysts, nonlinear optics, and biomedical engineering. γ-Fe 2 o 3 It is currently the most widely used, the largest output and the cheapest oxide recording medium material. The current marke...

AI Technical Summary

Problems solved by technology

However, this method has high requirements on external conditions, is not easy to control, and has high cost. For industrialization, it is still relatively difficult to realize on a large scale.

[0005] Although the powder prepared by the hydrothermal method has complete grain development, small particles and uniform distribution, magnetic nanoparticles with high purity, small degree of agglomeration and good sintering can be obtained, but this method needs to adjust the pH value and centrifugal cleaning, and the obtained particles uneven size

[0006] The process of precipitation method is simple, the performance of the prepared particles is good, and it has the advantages of high chemical activity of reactants, uniform mixing of product powder, fine particle size, etc. its application

In addition, the surfactant used in the precipitation method and the pH value of the reaction system will affect the performance of the product

[0007] Although some improvements have been made in the prior art about γ-Fe 2 o 3 Patents on nanoparticle preparation methods (patent number publication numbers: CN103316614A, CN104064315A, CN103274476A, CN103466717A, CN102910682A, CN102923787A, etc.), but most of the previous methods (including traditional methods) have many preparation processes and many types of raw materials that need to be processed, such as Need: octadecenoic acid, octyl ether, sodium acetate, ethanolamine, propylene glycol, hexamethylenetetramine, acid, alkali, organic solvent, etc., or need to adjust the pH value (pH value adjustment needs to add other acidic or alkaline substances ), or need some auxiliary agents or surfactants (such as polymer dispersants, polybasic acid salts, precipitants, etc.), and the treatment process (ultrasound, temperature adjustment, etc.) and follow-up work (the follow-up work needs to be added) Other medicines such as deionized water, acetone demulsification, ethanol, etc. for multiple separation and precipitation, centrifugal cleaning, etc.), the process is cumbersome

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