Preparing method of high saturation magnetization strength Mn0.8Zn0.2Fe2O4 nanoparticles and magnetic liquid of nanoparticles

Abstract

The invention relates to the field of novel nanometer functional materials, in particular to a preparing method of high saturation magnetization strength Mn0.8Zn0.2Fe2O4 nanoparticles and magnetic liquid of the nanoparticles. The preparing method specifically comprises the steps of dispersing salts of Mn2+, Zn2+ and Fe3+ into ultrapure water and quickly adding a NaOH solution under mechanical stirring; then placing the reaction liquid into a drying oven to be heated at high temperature, promoting the growth of crystal grains and completing the second step of sediment; then taking out the reaction liquid, adding fluorine ether acid, covering particles under mechanical stirring to avoid aggregation of the particles and then washing and drying the particles; finally, grinding the dried particles and dispersing the particles into fluorine ether oil base carrier liquid under mechanical stirring to prepare magnetic liquid. The prepared Mn0.8Zn0.2Fe2O4 nanoparticles have the advantages of high saturation magnetization strength, superparamagnetism, high antioxidant stability and the like, and the prepared fluorine ether oil base magnetic liquid can be applied in the field of rotary shaft sealing under the high temperature, corrosion and oxidation environment for a long term.

Description

technical field

[0001] The invention relates to the field of novel nano-functional materials, and relates to a nano-magnetic particle with high saturation magnetization, superparamagnetism and high oxidation resistance stability and its magnetic liquid, specifically a high saturation magnetization Mn 0.8 Zn 0.2 Fe 2 o 4 Preparation methods of nanoparticles and magnetic liquids thereof. Background technique

[0002] Magnetic liquid is a stable colloidal solution system formed by coating nano-scale magnetic particles with surfactants and then dispersing them into the base carrier liquid. It is widely used in new types of sealing and targeting carriers because it has both the magnetism of solid magnets and the fluidity of liquids. Medicine, magnetic heat therapy and other fields. Fe 3 o 4 The study of nanoparticles is quite mature, however, due to the Fe 2+ The presence of ions causes the nanoparticles to be oxidized during long-term application, and the magnetic propert...

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