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Preparation method of high-coercivity magnetic nanoparticle suspension

A technology of magnetic nanoparticles and high coercive force, which is applied in the direction of magnetic liquid, inductor/transformer/magnet manufacturing, electrical components, etc., and can solve the problems of large particle size distribution range of nano-alloy particles, difficulty in precise size control, and difficulty in application , to achieve the effect of simple preparation method, low cost and high coercive force

Active Publication Date: 2019-03-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the nano-alloy particles prepared by physical methods have a large particle size distribution range, it is difficult to precisely control the size, the purity is low and easy to oxidize, so it is difficult to apply to special fields such as biomedicine

Method used

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  • Preparation method of high-coercivity magnetic nanoparticle suspension
  • Preparation method of high-coercivity magnetic nanoparticle suspension
  • Preparation method of high-coercivity magnetic nanoparticle suspension

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In the following examples, metal-containing and inorganic mesoporous material colloids were prepared by using the sol-gel method. Ferric nitrate nonahydrate was used as the metal precursor, ethanol aqueous solution was used as the reaction solvent, and ethyl orthosilicate was used as the precursor of the inorganic mesoporous material. The heating rate, constant temperature, and holding time can obtain ε-Fe coated with silicon mesoporous materials. 2 o 3 Magnetic nanoparticles, by controlling the centrifugation rate and ultrasonic time, ε-Fe with a coercive force of 2T, uniform dispersion and stability can be prepared 2 o 3 Magnetic nanoparticle suspension.

[0034] Under the stirring action of a magnetic stirrer, 5.4 mL of deionized water and 26 mL of absolute ethanol were mixed. After 5 minutes, 10.6 g of ferric nitrate nonahydrate was added to the mixed solution. After 5 minutes, mixture A1 was obtained. Keep the rotating speed of the magnetic stirrer at 200r / min, ...

Embodiment 2

[0040] Under the stirring action of a magnetic stirrer, 5.4 mL of deionized water and 26 mL of absolute ethanol were mixed. After 5 minutes, 10.6 g of ferric nitrate nonahydrate was added to the mixed solution. After 5 minutes, mixture A1 was obtained. Keep the rotating speed of the magnetic stirrer at 200r / min, add 20mL tetraethyl orthosilicate dropwise to the mixture A1, and keep it for 20min to obtain a uniformly mixed liquid. The liquid was poured into a closed but not tightly sealed petri dish, and the petri dish was kept in a fume hood for 15 days at a temperature of 23°C to obtain colloids containing Fe and Si. Grind the colloid into particles with a particle size of less than 1 μm in an agate mortar, place the particles in an alumina crucible, put the crucible into a box-type resistance furnace for annealing, first increase the temperature from room temperature to 450 °C at a rate of 200 °C / h, and then Raise to 1000°C at a rate of 80°C / h, and keep at 1000°C for 1 hour ...

Embodiment 3

[0043] Under the stirring action of a magnetic stirrer, 5.4 mL of deionized water and 26 mL of absolute ethanol were mixed. After 5 minutes, 10.6 g of ferric nitrate nonahydrate was added to the mixed solution. After 5 minutes, mixture A1 was obtained. Keep the rotating speed of the magnetic stirrer at 200r / min, add 20mL tetraethyl orthosilicate dropwise to the mixture A1, and keep it for 20min to obtain a uniformly mixed liquid. The liquid was poured into a closed but not tightly sealed petri dish, and the petri dish was kept in a fume hood for 15 days at a temperature of 23°C to obtain colloids containing Fe and Si. Grind the colloid into particles with a particle size of less than 1 μm in an agate mortar, place the particles in an alumina crucible, put the crucible into a box-type resistance furnace for annealing, first increase the temperature from room temperature to 450 °C at a rate of 200 °C / h, and then Raise to 1200°C at a rate of 80°C / h, and keep at 1200°C for 4 hours...

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Abstract

The invention discloses a preparation method of high-coercivity magnetic nanoparticle suspension. A colloid containing metal and an inorganic mesoporous material is prepared by using a sol-gel method.Then, the colloid is grinded into particles, and the particles are heated to a certain temperature and kept at the temperature for a certain period of time to obtain magnetic nanoparticles coated with the inorganic mesoporous material. Further, the inorganic mesoporous material in the particles is removed with alkaline solution, and ultrasonic treatment and centrifugation are carried out to obtain high-coercivity magnetic nanoparticle suspension which is uniformly dispersed in water and stable. The high-coercivity magnetic nanoparticle suspension can be stably prepared by using the method ofthe invention, and the property of the particles and the stability of the suspension can be kept unchanged for a long time. Moreover, the preparation technology is simple, and the cost is low. Therefore, the preparation method has an excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of magnetic nanoparticle preparation, and in particular relates to a method for preparing a high-coercivity magnetic nanoparticle suspension. Background technique [0002] After years of accumulation and continuous development, magnetic nanomaterials have become one of the new magnetic materials with broad application prospects. Nanomagnetic materials not only have the unique properties of nanomaterials, such as surface and interface effects, small size effects, quantum size effects, macroscopic quantum tunneling effects, etc., but also have good magnetic orientation, superparamagnetic enzyme catalytic properties and biocompatibility. special properties such as sex. Because the characteristic physical lengths related to its magnetic properties are roughly between 1-100nm, when the size of the magnetic body is in the range of these characteristic physical lengths, it will show some abnormal magnetic properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44H01F41/00
CPCH01F1/44H01F41/00
Inventor 郑志刚黄浩然边宝茹杜娟
Owner SOUTH CHINA UNIV OF TECH
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