Preparation method of ferroferric oxide nanoparticles

Abstract

The invention discloses a preparation method of ferroferric oxide nanoparticles. The method comprises the following steps of dissolving ferric nitrate or ferric acetylacetonate in an organic solvent to obtain a steeping fluid, steeping water-soluble inorganic salts, drying and then reducing the mixture at the high temperature, and conducting washing with water to obtain the well-crystallized dispersed ferroferric oxide nanoparticles. According to the method, the high-dispersibility ferroferric oxide nanoparticles can be rapidly prepared in batches and is high in crystallinity and excellent inmagnetic property.

Description

technical field [0001] The invention relates to a method for preparing iron ferric oxide nanoparticles, belonging to the field of magnetic nanoparticle preparation. Background technique [0002] Ferroferric oxide nanoparticles have the characteristics of high specific saturation magnetization, electromagnetic absorption performance, and good biocompatibility, so they are widely used in the fields of magnetic liquids, electronic equipment, catalysis, water treatment, and biomedicine. [0003] The preparation methods of ferroferric oxide nanoparticles mainly contain coprecipitation method, oil phase thermal decomposition method, hydrothermal (solvothermal) method, microemulsion method, freeze-drying method, ultrasonic radiation, sol-gel method, etc., but existing There are still some defects in the preparation method, such as the particle size of ferric oxide synthesized by hydrothermal (solvothermal) method is too large, and the toxicity of organic solvent is large; although ...

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Problems solved by technology

[0003] The preparation methods of ferroferric oxide nanoparticles mainly contain coprecipitation method, oil phase thermal decomposition method, hydrothermal (solvothermal) method, microemulsion method, freeze-drying method, ultrasonic radiation, sol-gel method, etc., but existing There are still some defects in the preparation method, such as the particle size of ferric oxide synthesized by hydrothermal (solvothermal) method is too large, and the toxicity of organic solvent is large; although the ferric oxide prepared by sol-gel method is small in particle size and narrow in distribution , but the aging time of the sol is long and the process is complex; the ferroferric oxide nanoparticles synthesized by the thermal decomposition method have high purity and are not easy to agglomerate, but the conditions are harsh and the cost is high.

[0005] In summary, the iron ferric oxide nanoparticles prepared by the prior art have the defects of high preparation cost, complex process or poor crystallinity. The use of high melting point water-soluble inorganic salts to isolate is a possible way to solve this problem, but the premise is Make the water-soluble salt particles effectively isolate and disperse the precursor particles, so as to avoid the problems of agglomeration and sintering of nanoparticles during high-temperature calcination or reduction process

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