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

A nanoparticle and magnetization technology, applied in magnetic liquids, magnetic objects, chemical instruments and methods, etc., can solve the problem that the magnetic liquid cannot meet the requirements of high saturation magnetization, and the saturation magnetization of manganese-zinc ferrite nano-magnetic particles is low. and other problems, to achieve the effect of low coercivity, low equipment requirements, and simple preparation process

Active Publication Date: 2018-03-13
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of a fixed zinc doping ratio of 0.2, the saturation magnetization of the prepared MnZn ferrite nanoparticles is still low, which cannot meet the requirements of high saturation magnetization for magnetic liquids in practical industrial applications.

Method used

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

Examples

Experimental program
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Embodiment 1

[0023] A high saturation magnetization Mn 0.8 Zn 0.2 Fe 2 o 4 A method for preparing nanoparticles, comprising the following steps:

[0024] A. Weigh MnCl in molar ratio (0.8:0.2:2) 2 4H 2 O, ZnCl 2 , FeCl 3 4H 2 O salt, placed in 500ml of ultrapure water at 85°C, stirred until completely dissolved, and then poured into a reaction kettle with a heat preservation temperature of 85°C. Weigh 25g of NaOH powder, dissolve it in ultrapure water, then quickly add it into the reaction kettle, and at the same time, carry out strong mechanical stirring on the mixed solution, the stirring speed is 800r / min, and the stirring time is 60min.

[0025] B. Put the mixture obtained in A into a high-temperature oven to keep warm at 200°C for 4 hours, and use high temperature to promote the crystallization and growth of particles.

[0026] C. Wash and cool the mixed solution obtained in B to 70°C, and adjust its pH value to 6.23. Add a suitable surfactant, fluether acid, to the mixed sol...

Embodiment 2

[0030] A high saturation magnetization Mn 0.8 Zn 0.2 Fe 2 o 4 A method for preparing nanoparticles, comprising the following steps:

[0031] A. Weigh MnCl in molar ratio (0.8:0.2:2) 2 4H 2 O, ZnCl 2 , FeCl 3 4H 2 O salt, placed in 500ml of ultrapure water at 85°C, stirred until completely dissolved, and then poured into a reaction kettle with a heat preservation temperature of 85°C. Weigh 28g of NaOH powder, dissolve it in ultrapure water, then quickly add it into the reaction kettle, and at the same time, carry out strong mechanical stirring on the mixed solution, the stirring speed is 800r / min, and the stirring time is 60min.

[0032] B. Put the mixture obtained in A into a high-temperature oven to keep warm at 80°C for 4 hours, and use high temperature to promote the crystallization and growth of particles.

[0033] C. Wash and cool the mixture obtained in B to 70°C, and adjust its pH value to 5.1. Add a suitable surfactant, fluether acid, to the mixture in a unifo...

Embodiment 3

[0037] A high saturation magnetization Mn 0.8 Zn 0.2 Fe 2 o 4 A method for preparing nanoparticles, comprising the following steps:

[0038] A. Weigh MnCl in molar ratio (0.8:0.2:2) 2 4H 2 O, ZnCl 2 , FeCl 3 4H 2 O salt, placed in 500ml of ultrapure water at 85°C, stirred until completely dissolved, and then poured into a reaction kettle with a heat preservation temperature of 85°C. Weigh 32g of NaOH powder, dissolve it in ultrapure water, then quickly add it into the reaction kettle, and at the same time vigorously stir the mixed solution with a stirring speed of 800r / min and a stirring time of 60min.

[0039] B. Put the mixture obtained in A into a high-temperature oven to keep warm at 250°C for 3 hours, and use high temperature to promote the crystallization and growth of particles.

[0040] C. Wash and cool the mixture obtained in B to 70°C, and adjust its pH value to 6.96. Add a suitable surfactant, fluether acid, to the mixture in a uniform dropwise manner, with...

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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...

Claims

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Application Information

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IPC IPC(8): H01F1/36H01F1/44C01G49/00
CPCC01G49/009H01F1/344H01F1/36H01F1/445
Inventor 陈芳刘颖颜招强
Owner SICHUAN UNIV
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