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Magnetic hud fine particles possessing strong magnetic field response capability and its preparing method

A technology with responsiveness and strong magnetic field, applied in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc. Responsiveness, low equipment requirements, high magnetic content effect

Inactive Publication Date: 2003-10-01
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to this Fe 3 o 4 Particle-Magnetic Fe Encapsulated in Silica Core-Shell Microparticles 3 o 4 There are only 6 or less nanoparticles, the number of magnetic cores is too small, the particle magnetism is weak, and the external magnetic field response ability is weak. It is necessary to use a special magnetic separation column and apply a high-strength external magnetic field to achieve the enrichment of the particles. This limits the application of such magnetic particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Fe 3 o 4 Preparation of nanoparticles

[0020] Weigh 27.45g of FeCl3 ·6H 2 O and 10.10 g FeCl 2 4H 2 O was dissolved in 100ml of water through nitrogen and deoxygenation to obtain a mixed solution. Take 400ml of water in a 1L round-bottomed flask to pass through nitrogen to remove oxygen, add 25ml of concentrated ammonia water with a mass percentage concentration of 25-28%, and quickly pour the above-mentioned iron salt mixed solution into it under vigorous stirring. Reaction 1h. After the reaction is completed, use a 0.1T permanent magnet to separate the black solid from the reaction solution, and wash the obtained solid with high-purity water for 3 to 5 times to obtain Fe with a particle size of 6 to 10 nm. 3 o 4 Nanoparticles.

Embodiment 2

[0021] Example 2: γ-Fe 2 o 3 Preparation of nanoparticles

[0022] Weigh 27.45g of FeCl 3 ·6H 2 O and 10.10 g FeCl 2 4H 2 O was dissolved in 100ml of water through nitrogen and deoxygenation to obtain a mixed solution. Take 400ml of water in a 1L round-bottomed flask to pass through nitrogen to remove oxygen, add 25ml of concentrated ammonia water with a mass percentage concentration of 25-28%, and quickly pour the above-mentioned iron salt mixed solution into it under vigorous stirring. Reaction 1h. Oxygen was then introduced into the reaction solution for 2 h. After the reaction is completed, use a 0.1T permanent magnet to separate the red solid from the reaction solution, and wash the obtained solid with high-purity water for 3 to 5 times to obtain γ-Fe with a particle size of 6 to 10 nm. 2 o 3 Nanoparticles.

Embodiment 3

[0023] Example 3: CoFe 2 o 4 Preparation of nanoparticles

[0024] Weigh 27.86g of CoCl 3 ·6H 2 O and 10.10 g FeCl 2 4H 2 O was dissolved in 100ml of water through nitrogen and deoxygenation to obtain a mixed solution. Take 400ml of water in a 1L round-bottomed flask, pass nitrogen to remove oxygen, add 25ml of concentrated ammonia water with a concentration of 25-28% by mass, quickly pour the above mixed salt solution into it under vigorous stirring, and react at 50°C 1h. After the reaction is completed, use a 0.1T permanent magnet to separate the black solid from the reaction solution, and wash the obtained solid with high-purity water for 3 to 5 times to obtain CoFe with a particle size of 3 to 13 nm. 2 o 4 Nanoparticles.

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Abstract

A magnetic core-shell microparticle with strong response power to magnetic field is composed of SiO2 as shell and 20-1000 nanometre-class magnetic ferrite particles with super-paramagnetism. Its preparing process includes such steps as preparing the said ferrite particles by the deposition method, dispersing them in the aqueous solution of water-soluble inorganic salt containing SiO2, stirring, and hydrolysis reaction of ethyl n-silicate for coating SiO2 again.

Description

technical field [0001] The invention belongs to the field of magnetic materials, in particular to a core-shell type magnetic particle and a preparation method thereof. Background technique [0002] Magnetic particles are widely used in biological and medical fields such as separation and purification of biological materials such as cells, proteins, DNA and RNA, biomolecular labeling and detection, immune analysis and targeted drugs. This is mainly based on the external magnetic field response ability of magnetic particles, such as the enrichment and directional movement of magnetic particles under an external magnetic field. Compared with commonly used separation methods such as precipitation, centrifugation, ion exchange and various chromatography methods, the magnetic separation technology developed based on the enrichment of magnetic particles under the action of an external magnetic field is convenient and quick, requires simple equipment, Features such as high extracti...

Claims

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Application Information

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IPC IPC(8): H01F1/00H01F41/02
Inventor 王刚杨百全庄家骐杨文胜李铁津
Owner JILIN UNIV
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