Method for preparing ferrite/silicon dioxide core-shell nano particles by using ultrasonic treatment

A nanoparticle and ultrasonic treatment technology, applied in the field of magnetic nanomaterials, can solve the problems that are difficult to meet the needs of small-sized particle applications, large core-shell particle size, etc., and achieve a compact structure, strong oxidation resistance, and high chemical stability. Effect

Inactive Publication Date: 2004-02-25
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ferrite nanoparticles used in this method do not have any surface treatment, and the interaction between ferrite nanoparticles is very strong, so ferrite-silica core-shell particles with a large number of cores can be formed after coating, but the core The size of shell particles is relatively large, generally above 200nm, which is difficult to meet the needs of some applications that require the use of small-sized particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Fe 3 o 4 Preparation of nanoparticles

[0019] Weigh 12.48g of FeCl 3 ·6H 2 O and 4.60 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 20ml 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

[0020] Example 2: γ-Fe 2 o 3 Preparation of nanoparticles

[0021] Weigh 12.48g of FeCl 3 ·6H 2 O and 4.60 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 20ml 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

[0022] Example 3: CoFe 2 o 4 Preparation of nanoparticles

[0023] Weigh 12.66g of CoCl 3 ·6H 2 O and 4.60 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 20ml of concentrated ammonia water with a mass percentage concentration of 25-28%, 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

The present invention relates to a method for using ultrasonic treatment to prepare ferrite-silicone dioxide core-shell nano particle. The method includes the following steps: firstly, using coprecipitation process to prepare ferrte nano particle, then making the ferrite nano particle under the process of ultrasonic treatment, then using inorganic silicone source and organic silicone source to make wrappage to twice so as to obtain the invented ferrite-silicone dioxide core-shell nano particle whose grain size is 50-200 nm. The product can be used in the fields of biological, sealing and magnetic recording material, etc.

Description

technical field [0001] The invention belongs to the field of magnetic nanometer materials, in particular to a method for preparing core-shell magnetic nanometer particles. Background technique [0002] Ferrite nanoparticles have been widely used in sealing, lubrication, printing and magnetic recording. Recently, ferrite nanoparticles have also received increasing attention in some bio-related fields, such as magnetic resonance imaging, bioseparation, drug delivery and therapy. However, due to the strong magnetic dipole interaction between ferrite nanoparticles, it is easy to form large aggregates, and the particles will dissolve under acidic conditions, which greatly limits their use. For this reason, ferrite nanoparticles are generally coated before use, and the coating layer is used to realize the dispersion of the particles and to protect the particles to a certain extent. The commonly used coating layer is an organic modification layer composed of some surface-active o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/628
Inventor 王刚杨春强陆子阳孙菁庄家骐杨文胜李铁津
Owner JILIN UNIV
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