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High-saturation-magnetization Fe3O4-Ag composite material and preparation method thereof

A composite material, magnetization technology, applied in the fields of inorganic material magnetism, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of reduced saturation magnetization of nanomaterials, limited magnetic properties, and inability to observe changes, etc. Achieve uniform particle size, increase purity and good dispersibility

Active Publication Date: 2018-01-23
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the experimental process is very simple, this method uses a stainless steel autoclave, which makes the experiment unsafe, and it is impossible to observe the changes in the reaction process experiment
Synthesis of Fe by Mohamed Abbas et al. 3 o 4 @SiO 2 @Ag nanoparticles, although Fe 3 o 4 The surface-modified Ag is very uniform, but the saturation magnetization of the modified Ag nanomaterials is greatly reduced, which limits the application of magnetic fields in the later stage.

Method used

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  • High-saturation-magnetization Fe3O4-Ag composite material and preparation method thereof
  • High-saturation-magnetization Fe3O4-Ag composite material and preparation method thereof
  • High-saturation-magnetization Fe3O4-Ag composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, a kind of Fe 3 o 4 -The preparation method of Ag composite material, comprises the steps:

[0027] S1. Using 0.7g iron acetylacetonate, 1.3mL oleic acid and 10mL benzyl ether as raw materials, in an argon atmosphere, heat up to 290°C, reflux for 8min, cool to room temperature, stand still to collect the precipitate, and use toluene and n-hexane to press any After washing with a mixed solvent of proportional composition, Fe 3 o 4 Nanoparticles, stored in chloroform; in which 10mgFe 3 o 4 After the nanoparticles were washed with methanol, they were added into 40 mL of methanol and mixed to obtain solution A.

[0028] S2. Mix 0.0009g of sodium borohydride and 0.046g of sodium citrate aqueous solution, heat and reflux at 60°C, stir for 30 minutes, slowly add 5mL of silver nitrate solution with a concentration of 0.001mol / L to the mixed solution, add hydroxide Adjust the pH value to 10.8 with sodium, continue heating for 20 minutes, and naturally co...

Embodiment 2

[0032] In this embodiment, a kind of Fe 3 o 4 -The preparation method of Ag composite material, comprises the steps:

[0033] S1. Using 0.72g iron acetylacetonate, 1.32mL oleic acid and 10.2mL benzyl ether as raw materials, in an argon atmosphere, heat up to 290°C, reflux for 8min, cool to room temperature, stand still to collect the precipitate, press toluene and n-hexane After washing with a mixed solvent of any proportion, Fe 3 o 4 Nanoparticles, stored in chloroform; in which 10.1mgFe 3 o 4 After the nanoparticles were washed with methanol, they were added into 39 mL of methanol and mixed to obtain solution A.

[0034] S2. Mix 0.00088g of sodium borohydride and 0.045g of sodium citrate aqueous solution, heat to reflux at 60°C, stir for 30min, slowly add 5.2mL of silver nitrate solution with a concentration of 0.001mol / L to the mixed solution, and add hydrogen Adjust the pH value to 10.8 with sodium oxide, continue heating for 20 minutes, and naturally cool to room te...

Embodiment 3

[0038] In this embodiment, a kind of Fe 3 o 4 -The preparation method of Ag composite material, comprises the steps:

[0039] S1. Using 0.74g iron acetylacetonate, 1.34mL oleic acid and 10.4mL benzyl ether as raw materials, in an argon atmosphere, heat up to 290°C, reflux for 8min, cool to room temperature, stand still to collect the precipitate, press toluene and n-hexane After washing with a mixed solvent of any proportion, Fe 3 o 4 Nanoparticles, stored in chloroform; in which 10.2mgFe 3 o 4 After the nanoparticles were washed with methanol, they were added into 38 mL of methanol and mixed to obtain solution A.

[0040] S2. Mix 0.00089g of sodium borohydride and 0.0465g of sodium citrate aqueous solution, heat to reflux at 60°C, stir for 30 minutes, slowly add 5.4mL of silver nitrate solution with a concentration of 0.001mol / L to the mixed solution, and add hydrogen Adjust the pH value to 10.8 with sodium oxide, continue heating for 20 minutes, and naturally cool to r...

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Abstract

The invention discloses a high-saturation-magnetization Fe3O4-Ag composite material and a preparation method thereof, and belongs to the technical field of magnetic functional materials. In order to solve the problem that saturation magnetization of the Fe3O4-Ag composite material prepared by the preparation method is greatly reduced in comparison with that of Fe3O4, the high-saturation-magnetization Fe3O4-Ag composite material takes PEI-DTC as a bonding layer to modify Fe3O4 nano-particles, and a method for regulating the pH value of a solution is utilized for preparing Ag nano-particles withdimensions smaller than 10 nm. A seed growth method is utilized to prepare the Fe3O4-Ag composite material, so that operation is simple, controllability is strong and repeatability is good; and the prepared Fe3O4-Ag composite material is uniform in grain size and is good in dispersion; and silver particles are uniformly deposited on the Fe3O4 nano-particles, so that saturation magnetization of the Fe3O4-Ag nano-particles is 70-72 emu / g.

Description

technical field [0001] The invention belongs to the technical field of magnetic functional materials. Background technique [0002] Researchers have been paying attention to the preparation process and application prospects of multifunctional magnetic nanocomposites, especially noble metal-modified magnetic nanoparticles with unique magnetic and optical properties, which have been applied in the fields of biotherapy and medical imaging, recyclable catalysis and drug delivery. . Recently, silver-modified ferrite composite magnetic nanoparticles have become one of the research hotspots in the field of multifunctional magnetic composite materials. [0003] Fe 3 o 4 Nanoparticles themselves can be used as a functional material alone in cutting-edge technical fields such as the preparation of magnetic pigments, electronic materials, and catalyst raw materials. They have the advantages of superparamagnetism, low Curie temperature, high resistivity, and stable physical and chemi...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24H01F1/11B82Y30/00B82Y40/00
Inventor 刘洋张媛媛寇蔷薇王雅新杨景海
Owner JILIN NORMAL UNIV
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