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Method for preparing nano spinel ferrite with equal grain size

A nano-spinel and ferrite technology is applied in the field of preparation of nano-spinel ferrite, which can solve the problems of high preparation cost, environmental pollution, and difficulty in operation, and achieves reduced energy consumption, uniform particle size distribution, The effect of controlled preparation

Inactive Publication Date: 2009-08-05
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nano spinel ferrite with uniform particle size, which solves the problems of difficult operation, high preparation cost and serious environmental pollution, and realizes the controllable preparation of particle size under low temperature conditions. Uniform nano-spinel ferrite

Method used

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Examples

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Effect test

Embodiment 1

[0018] Accurately weigh Co(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, mixed salt solution was prepared with deionized water, and the concentrations of metal ions in the solution were: [Co 2+ ]=0.2M, [Fe 3+ ]=0.4M, put this mixed solution into a beaker. Separately prepare NaBH 4 and polyvinylpyrrolidone (PVP) mixed solution, where [NaBH 4 ]=1.5M, [PVP]=1.8g / L. Mix an equal volume of mixed salt solution with NaBH 4 Pour it into a rapidly rotating colloid mill (6000 rpm) together with the mixed solution of PVP, and stir vigorously for 5 minutes. Afterwards, the reduced metal nanoparticles were transferred to an autoclave with a polytetrafluoroethylene liner and subjected to hydrothermal crystallization at 120° C. for 12 hours. After naturally cooling to room temperature, the obtained precipitate was washed with deionized water until neutral. Dry at 40°C for 12 hours to obtain CoFe with an average particle size of 18nm 2 o 4 Spinel nanoparticles.

Embodiment 2

[0020] Accurately weigh Ni(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, mixed salt solution was prepared with deionized water, and the concentrations of metal ions in the solution were: [Ni 2+ ]=0.25M, [Fe 3+ ]=0.5M, put this mixed solution into a beaker. Separately prepare NaBH 4 and polyvinyl alcohol (PVA) mixed solution, where [NaBH 4 ]=1.0M, [PVA]=3.2g / L. Mix an equal volume of mixed salt solution with NaBH 4 Pour it into a rapidly rotating colloid mill (4500 rpm) together with the mixed solution of PVA, and stir vigorously for 5 minutes. Afterwards, the reduced metal nanoparticles were transferred to an autoclave with a polytetrafluoroethylene liner and subjected to hydrothermal crystallization at 200° C. for 24 hours. After naturally cooling to room temperature, the obtained precipitate was washed with deionized water until neutral. Dry at 40°C for 12 hours to obtain NiFe with an average particle size of 52nm 2 o 4 Spinel nanoparticles.

Embodiment 3

[0022] Accurately weigh Co(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Cu(NO 3 ) 2 ·3H 2 O is prepared into a mixed salt solution with deionized water, and the concentrations of metal ions in the solution are: [Co 2+ ]=0.4M, [Fe 3+ ]=1.0M, [Cu 2+ ] = 0.1M This mixed solution was placed in a beaker. Separately prepare NaBH 4 and polyvinylpyrrolidone (PVP) mixed solution, where [NaBH 4 ]=1.2M, [PVP]=4.0g / L. Mix an equal volume of mixed salt solution with NaBH 4 Pour it into a rapidly rotating colloid mill (3000 rpm) together with the mixed solution of PVP, and stir vigorously for 7 minutes. Afterwards, the reduced metal nanoparticles were transferred to an autoclave with a polytetrafluoroethylene liner for hydrothermal crystallization at 150° C. for 6 hours. After naturally cooling to room temperature, the obtained precipitate was washed with deionized water until neutral. Dry at 40°C for 12 hours to obtain Co with a particle size of 27 nm 0.8 Cu 0.2 Fe 2 o 4 spinel ...

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Abstract

The invention discloses a method for preparing nano-spinel ferrite with uniform particle size, which belongs to the technical field of metal oxide preparation. First, the metal ions are reduced into highly dispersed nano-metal particles in a colloid mill, and then the mixed solution containing nano-metal particles is transferred to a high-pressure reactor with a polytetrafluoroethylene liner for hydrothermal crystallization, resulting in a particle size of 5 to 200nm spinel ferrite particles. Its advantages are: the high-speed shearing effect of the colloid mill makes the metal particles obtained by reduction highly dispersed, so that nano-spinel ferrite with uniform particle size can be obtained during the hydrothermal crystallization process; the reaction is carried out in the solution, and by adjusting Parameters such as reactant concentration, reaction temperature, and reaction time can realize the control of the particle size of nanoparticles; since the reaction does not require a high-temperature roasting process, the operation is simple, the preparation cost and energy consumption are low, which is conducive to industrial application.

Description

technical field [0001] The invention belongs to the technical field of metal oxide preparation, in particular to a method for preparing nano spinel ferrite with uniform particle size, and the particle size can be controlled under low temperature conditions. Background technique [0002] Ferrite is a composite oxide composed of iron and one or more other metals, and is widely used in various fields such as communication broadcasting, radar navigation, space navigation, and medical biology. In recent years, with the continuous development of material science, the development and research of nanomaterials and their use in the preparation of ferrite materials have greatly improved the performance of ferrite materials. Due to the unique specific surface effect, small size effect, interface effect and macroscopic quantum effect of nanomaterials, they exhibit different physical properties such as light, electricity, heat, and magnetism from conventional materials, so that the mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/626
Inventor 李峰顾智军项顼
Owner BEIJING UNIV OF CHEM TECH
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