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Method for preparing magnetic metal-metal core-shell nano particles

A magnetic metal nano and magnetic metal technology, applied in the direction of coating, etc., can solve the problems of low coating rate, easy nucleation of shell metal, difficult control of shell metal formation, etc. Wide, guarantee the effect of effective coating

Active Publication Date: 2012-03-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of preparing core-shell magnetic metal nanoparticles by the aqueous phase method is that the magnetic metal salt is easily reduced and the reaction temperature is low, but due to the fast reduction speed, the size and shape of the nanoparticles are difficult to control, and the shell metal is easy to nucleate alone , the coverage rate is not high
If the organic liquid phase method is used, it is easy to prepare nanoparticles with relatively uniform size and good crystallization, but the generation control of the shell metal is a difficult point.
At present, there are still reports on the preparation of gold-coated magnetic metal nanoparticles with obvious core-shell structure by organic liquid phase method.

Method used

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  • Method for preparing magnetic metal-metal core-shell nano particles
  • Method for preparing magnetic metal-metal core-shell nano particles
  • Method for preparing magnetic metal-metal core-shell nano particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 0.5mmol nickel acetylacetonate and 6ml oleylamine into the three-necked flask, stir and mix under the protection of argon, then add the mixture of 0.012mmol chloroauric acid and 0.3ml anisole into the three-necked flask, stir for 10min, and then heat up to 50°C, keep warm for 10min, then raise the temperature to 200°C, keep warm for 20min, then cool to 150°C. Quickly inject the mixture of 0.5mmol pre-prepared gold organic compound and 2ml chloroform, incubate at 140°C for 30min, cool naturally, add acetone to precipitate the nanoparticles, take out the reaction mother liquor by centrifugation, and then use ethanol, acetone, n-hexane mixed solution Repeated washing, centrifugation three times, and finally vacuum drying to obtain a powder product, its electron microscope picture and energy spectrum are as follows figure 1 and figure 2 shown.

Embodiment 2

[0035] Add 0.5mmol nickel acetylacetonate and 6ml oleylamine into the three-necked flask, stir and mix under the protection of argon, then add the mixture of 0.012mmol chloroauric acid and 0.3ml ethanol into the three-necked flask, stir for 10min and then heat up to 50°C , keep warm for 10min, then raise the temperature to 200°C, keep hold for 20min, then cool to 150°C. Quickly inject the mixture of 0.5mmol pre-prepared gold organic compound and 2ml chloroform, incubate at 130°C for 30min, cool naturally, add acetone to precipitate the nanoparticles, take out the reaction mother liquor by centrifugation, and then use ethanol, acetone, n-hexane mixed solution Repeated washing, centrifugation 3 times, and finally vacuum drying to obtain a powder product, its electron microscope picture is as follows: image 3 As shown, its energy spectrum and figure 2 similar.

Embodiment 3

[0037] Add 0.5mmol nickel acetylacetonate, 5ml oleylamine, and 2ml dodecylamine into the three-necked flask, stir and mix under the protection of argon, then add the mixture of 0.012mmol chloroauric acid and 0.3ml toluene into the there-necked flask, and stir for 10min Then raise the temperature to 50°C, keep the temperature for 10 minutes, then raise the temperature to 210°C, keep the temperature for 20 minutes, and then cool to 150°C. Quickly inject a mixture of 0.3mmol of pre-prepared gold organic compound and 3ml of chloroform, keep it warm at 130°C for 30min, then cool naturally, add acetone to precipitate the nanoparticles, take out the reaction mother liquor by centrifugation, and then use a mixed solution of ethanol, acetone, and n-hexane Repeated washing, centrifugation three times, and finally vacuum drying to obtain a powder product, its electron microscope picture is as follows: Figure 4 As shown, its energy spectrum and figure 2 similar.

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Abstract

The invention discloses a method for preparing magnetic metal-metal core-shell nano particles, which relates to metal nano particles. The method comprises: dissolving chloroauric acid and triphenylphosphine in ethanol respectively, filtering, cleaning, drying, obtaining an organic compound formed by gold and triphenylphosphine, mixing the organic compound with alkylamine, obtaining solution A, mixing an organic solvent A with a noble metal salt, adding mixed solution A, rising the temperature to perform a reaction, cooling and obtaining magnetic metal nano particles; dissolving the obtained organic compound formed by gold and triphenylphosphine in an organic solvent B, injecting obtained magnetic metal nano particles, keeping the temperature between 120 and 160 DEG C for 20 minutes to 1 hour, reducing to obtain gold and wrapping gold on the formed magnetic metal nano particles and obtaining nano particles in which gold and magnetic metal are in a core-shell structure; and washing the nano particles in which gold and magnetic metal are in a core-shell structure, performing centrifugal separation, drying and obtaining powder product, namely magnetic metal-gold core-shell nano particles.

Description

technical field [0001] The invention relates to a metal nano particle, in particular to a preparation method of a magnetic metal-gold core-shell nano particle. Background technique [0002] Due to their small size, large specific surface area, and excellent properties unmatched by conventional bulk materials, metal nanoparticles have been gradually paid attention to. However, they have high surface activity, are easy to agglomerate, and are easily oxidized in air, especially magnetic metals (Fe , Co, Ni) nanoparticles are more easily oxidized in the air, which greatly limits their performance and application range. If the inert layer is coated on the magnetic metal nanoparticles to form a core-shell structure, the problem of oxidation of the nanoparticles can be solved, and the magnetic properties of the particles will not be significantly affected. Therefore, it is particularly important to prepare magnetic metal nanoparticles with core-shell structure. [0003] As a nobl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02
Inventor 陈远志陈小真佘厚德彭栋梁岳光辉
Owner XIAMEN UNIV
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