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Magnetic nanometer particle with triple core-shell structure and method for making same

A technology of magnetic nanoparticles and magnetic particles, applied in magnetic materials, magnetic objects, electrical components, etc., can solve the problems of magnetic particles easily detached from microspheres, affecting product performance, agglomeration, etc.

Inactive Publication Date: 2007-08-08
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of polymer microspheres obtained by this method is usually relatively loose, and the magnetic particles contained therein are easily separated from the microspheres during long-term storage, and agglomeration still occurs, thereby affecting the performance of the product; When the active substance is immobilized by adsorption or affinity, it is also easy to fall off

Method used

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  • Magnetic nanometer particle with triple core-shell structure and method for making same

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Embodiment 1

[0022] (1) Mix 10mmol surfactant (such as Aldrich Igepal CO-520) with 150ml cyclohexane, ultrasonically disperse for 30 minutes; then add it to 30ml cyclohexane solution containing 2mg / ml magnetic particles, stir well; then Add 2ml of concentrated ammonia water, and finally add 2ml of ethyl orthosilicate, and hydrolyze for 2 to 72 hours under stirring conditions. Through centrifugation and ethanol ultrasonic washing for 2-3 times, silicon dioxide nano-particles coated with magnetic cores dispersed in ethanol with a diameter of 10-100nm are obtained. In the above steps, the magnetic core can be FePt, CoPt, FeCo or FeCoPt, etc., and the corresponding FePt-SiO 2 、CoPt-SiO 2 、FeCo-SiO 2 or FeCoPt-SiO 2 Core-shell magnetic nanoparticles. In this step, the relevant parameters are selected within the allowable range of the aforementioned parameters, and the required silica nanoparticles coated with magnetic cores can be prepared.

[0023] (2) get the FePt-SiO that the preparatio...

Embodiment 2

[0025] Get the 1000g mass concentration that prepares in embodiment step (1) and be the CoPt-SiO of 0.2% 2 The ethanol solution of nanoparticles, after ultrasonic dispersion for 30 minutes, under stirring, add 10.00g of water, then add 1.00g of aluminum isopropoxide to the solution, continue to stir for 24 hours, use magnet or centrifugal separation to obtain CoPt-SiO 2 -Al 2 o 3 The nanoparticles were washed three times with ethanol, and then dispersed in ethanol.

Embodiment 3

[0027] Get the 1000g mass concentration that prepares in embodiment 1 step (1) and be 0.5% FeCo-SiO 2 The ethanol solution of nanoparticles, after ultrasonic dispersion for 30 minutes, under stirring, add 5.00g of water, then add 5.00g of n-butyl titanate to the solution, continue to stir for 24 hours, use magnet or centrifugal separation to obtain FeCo- SiO 2 -TiO 2 The nanoparticles were washed three times with ethanol, and then dispersed in ethanol.

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Abstract

The invention relates to one magnetic nuclear and earth silicon and metal oxidation three nuclear shell structure nanometer particle and its process method, which uses magnetic nanometer particle as nuclear with diameter of 2 to 5 nm and processes earth silicon nanometer particles with diameter of 10 to 100nm and uses metal alkoxy compound in ethanol system and covers one layer of metal oxidation on earth silicon surface to form three-fold nuclear shell structure of the compound.

Description

technical field [0001] The invention belongs to the field of magnetic nanometer materials, and in particular relates to a magnetic core-silicon dioxide-metal oxide triple core-shell nanoparticle and a preparation method thereof. Background technique [0002] Magnetic nanoparticles have been widely used in sealing, lubrication, printing, and magnetic recording. The preparation of magnetic nanoparticles has attracted widespread attention. In 2000, scientists led by Sun Shouheng from IBM Corporation in the United States were using chemical methods to synthesize FePt nanoparticles. A lot of attempts have been made in the aspect of particles to precisely control the size (3-10nm) of the resulting nanoparticles and to regularly assemble them into FePt superlattice nanoparticles. This work demonstrated for the first time that magnetic arrays based on FePt nanoparticle systems can be used for ultra-high-density storage [Science 287, 1989 (2000)]. [0003] On this basis, IBM scienti...

Claims

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Application Information

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IPC IPC(8): H01F1/00C04B35/624B22F1/02
Inventor 汤慧利任瑜岳斌贺鹤勇
Owner FUDAN UNIV
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