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Preparation method for carbon-coated Ni-Zn-Fe magnetic nanometer material taking chitosan as carbon source

A technology of carbon-coated nickel-zinc and carbon-coated nickel, which is applied in the field of material preparation, can solve the problems that hinder the application of basic research on carbon-coated metal nanoparticles, complex devices, and high energy consumption, and achieve good application prospects and low residual magnetization The effect of strength and strong chemical stability

Inactive Publication Date: 2014-03-12
NANCHANG HANGKONG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods or devices are complicated, costly, or energy-intensive, which to some extent hinders the basic research on the application of carbon-coated metal nanoparticles.

Method used

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  • Preparation method for carbon-coated Ni-Zn-Fe magnetic nanometer material taking chitosan as carbon source

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Effect test

Embodiment 1

[0015] A preparation method of nickel-zinc-iron magnetic nanomaterials coated with chitosan as carbon source carbon, the preparation method is as follows:

[0016] (1) Ni 0.6 Zn 0.4 Fe 2 O 4 Preparation of granules:

[0017] Weigh 0.06mol of Ni(NO 3 ) 2 ·6H 2 O, 0.3mol Fe(NO 3 ) 3 ·9H 2 O, 0.09mol of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 50ml of absolute ethanol, 2ml of glacial acetic acid was added, and the mixture was fully mixed and placed in a 70°C water bath for microwave oscillation. 30ml of ammonia solution was added dropwise at a rate of 3ml / min to keep the pH of the solution between 9.5 and 10.0. After 100 min, the supernatant was filtered off, washed repeatedly with deionized water at 80°C and absolute ethanol, and then dried at 100°C to obtain nickel-zinc ferrite powder. The obtained nickel-zinc ferrite powder was placed in a muffle furnace for 350 ℃ calcined at high temperature for 5h, cooled to room temperature, and ground to obtain Ni 0.6 Zn 0.4 Fe ...

Embodiment 2

[0023] A preparation method of nickel-zinc-iron magnetic nanomaterials coated with chitosan as carbon source carbon, the preparation method is as follows:

[0024] (1) Ni 0.6 Zn 0.4 Fe 2 O 4 Preparation of granules:

[0025] Weigh 0.06mol of Ni(NO 3 ) 2 ·6H 2 O, 0.3mol Fe(NO 3 ) 3 ·9H 2 O, 0.09mol of Zn(NO 3 ) 2 ·6H 2O was dissolved in 50ml of absolute ethanol, 3ml of glacial acetic acid was added, and the mixture was fully mixed and placed in a 70°C water bath for microwave oscillation. 30ml of ammonia solution was added dropwise at a rate of 3ml / min to keep the pH of the solution between 9.5 and 10.0. After 120 min, the supernatant was filtered off, washed repeatedly with deionized water at 80°C and absolute ethanol, and then dried at 100°C to obtain nickel-zinc ferrite powder. The obtained nickel-zinc ferrite powder was placed in a muffle furnace for 400 ℃. ℃ calcined at high temperature for 5h, cooled to room temperature, and ground to obtain Ni 0.6 Zn 0.4 F...

Embodiment 3

[0031] A preparation method of nickel-zinc-iron magnetic nanomaterials coated with chitosan as carbon source carbon, the preparation method is as follows:

[0032] (1) Ni 0.6 Zn 0.4 Fe 2 O 4 Preparation of granules:

[0033] Weigh 0.06mol of Ni(NO 3 ) 2 ·6H 2 O, 0.3mol Fe(NO 3 ) 3 ·9H 2 O, 0.09mol of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 50ml of absolute ethanol, 4ml of glacial acetic acid was added, and the mixture was fully mixed and placed in a 70°C water bath for microwave oscillation. 30ml of ammonia solution was added dropwise at a rate of 3ml / min to keep the pH of the solution between 9.5 and 10.0. After 140 min, the supernatant was filtered off, washed repeatedly with deionized water at 80°C and absolute ethanol, and then dried at 100°C to obtain nickel-zinc ferrite powder. The obtained nickel-zinc ferrite powder was placed in a muffle furnace at 450 °C. ℃ calcined at high temperature for 5h, cooled to room temperature, and ground to obtain Ni 0.6 Zn 0.4 ...

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Abstract

The invention discloses a preparation method for carbon-coated Ni-Zn-Fe magnetic nanometer material taking chitosan as a carbon source. The method comprises the steps that Ni0.6Zn0.4Fe2O4 magnetic nanometer particles are prepared by adopting co-precipitation method, sodium dodecyl benzene sulfonate is used as surfactant to modify the surface of the nickel zinc ferrite, the Ni0.6Zn0.4Fe2O4 magnetic nanometer particles are subjected to in-situ coating by chitosan, meanwhile the emulsion cross-linking method is adopted for carrying out surface modification on the magnetic nanometer particles, and finally, the chitosan-coated nickel zinc ferrite is subjected to high-temperature hydrogen gas reduction, so that the carbon-coated Ni-Zn-Fe magnetic nanometer material is obtained. The magnetic nanometer material has higher saturation magnetization, lower coercive force and residual magnetization, and has important scientific significance and good application value on the further modified preparation of materials such as magnetic resonance imaging contrast agent, bioanalysis and drug carrier, hyperthermia medium, catalyst, magnetic recording and magnetic separation medium.

Description

technical field [0001] The invention relates to a preparation method of a nickel-zinc-iron magnetic nanomaterial coated with chitosan as a carbon source carbon, and belongs to the field of material preparation. Background technique [0002] Since Ruoff et al. used La-doped graphite rods as anodes for arc discharge in 1993 and found carbon-coated nanoparticles with a core / carbon shell structure in the soot produced, carbon-coated metal nanomaterials have become a new type of Research hotspots of carbon materials. The unique core / shell structure of carbon-coated metal nanomaterials can reduce the agglomeration of metal nanoparticles and protect the metal particles from oxidation. Therefore, the application scope of metal nanomaterials has been expanded, and it has shown broad application prospects in many fields such as catalysis, biomedicine, microelectronics, electromagnetism, and optics. Different preparation techniques have also appeared one after another, mainly arc dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147C04B35/26C04B35/628
Inventor 谢宇刘福明乐长高唐星华汪月华赖文张卫国潘建飞
Owner NANCHANG HANGKONG UNIVERSITY
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