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Method for preparing nano-particles of magnetic ferric oxide

A nanoparticle and cubic technology, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of complicated preparation process of γ-FeOOH, and achieve the effect of easy control, simplified preparation process and cost reduction.

Inactive Publication Date: 2006-06-21
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another way to prepare γ-Fe 2 o 3 The method is to prepare γ-FeOOH first, and then prepare γ-Fe through thermal decomposition of γ-FeOOH 2 o 3 , but the preparation process of γ-FeOOH in this preparation process is relatively complicated

Method used

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  • Method for preparing nano-particles of magnetic ferric oxide

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Experimental program
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Effect test

Embodiment 1

[0038] The polyethylene glycol is PEG-400. Prepared separately containing FeCl 3 .6H 2 O (C.R. grade) 5.4g and NaOH 2.8g (C.R. grade) solution 20ml, FeCl 3 .6H 2 The concentrations of the O solution and the NaOH solution are 1 mol / L and 3.5 mol / L respectively, and PEG-4004ml is added to the two solutions, and stirred evenly. While stirring, pour the NaOH solution into the FeCl 3 solution, NaOH and FeCl were stirred 3 A precipitation reaction occurs in the reaction solution for 20-40 minutes. The reaction solution was suction filtered, and the filter cake was dried at 50-70°C for 4-8 hours to obtain a crude product. Roast the crude product at 300-400°C for 1-2h, wash with water, filter, dry in vacuum at 60°C for 4-8h, and grind to obtain the product, rod-shaped γ-Fe 2 o 3 .

[0039] The aspect ratio of the product particles is about 6, the length of which is 200nm, and the diameter is about 30nm.

Embodiment 2

[0041] The polyethylene glycol is PEG-600. Prepared separately containing FeCl 3 .6H 2 O (C.R. grade) 7.56g and NaOH3.92g (C.R. grade) solution 20ml, FeCl 3 .6H 2The concentrations of the O solution and the NaOH solution were 1.4 mol / L and 4.9 mol / L respectively, and 5.6 ml of PEG-600 was added to the two solutions, and stirred evenly. While stirring, pour the NaOH solution into the FeCl 3 solution, NaOH and FeCl were stirred 3 A precipitation reaction occurs in the reaction solution for 20-40 minutes. The reaction solution was suction filtered, and the filter cake was dried at 50-70°C for 4-8 hours to obtain a crude product. The crude product is calcined at 300-400°C for 1-2h, washed with water, filtered, dried in vacuum at 60°C for 4-8h, and ground to obtain the product, rod-shaped γ-Fe 2 o 3 .

Embodiment 3

[0043] The polyethylene glycol is PEG-400. Prepared separately containing FeCl 3 .6H 2 O (C.R. grade) 5.4g and NaOH 2.8g (C.R. grade) solution 20ml, FeCl 3 .6H 2 The concentrations of the O solution and the NaOH solution are 1 mol / L and 3.5 mol / L respectively, and PEG-4004ml is added to the two solutions, and stirred evenly. While stirring, pour the NaOH solution into the FeCl 3 solution, NaOH and FeCl were stirred 3 A precipitation reaction occurs in the reaction solution for 20-40 minutes. The reaction solution was filtered with suction, the precipitate was washed with deionized water, filtered, the filter cake was stirred in the aqueous solution of PEG-400 for 30-60min, filtered with suction, the filter cake was dried at 50-70°C for 5-7h, and calcined at 300-400°C for 1 -2h, grind to get product, cubic γ-Fe 2 o 3 .

[0044] The particle size of the product is about 20nm.

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Abstract

The invention relates to a method for preparing magnetic ferric oxide nano particle, belonging to the technological field for preparing inorganic non-metal magnetic nano material. The invention prepares ª†-Fe2O3 nano particle in stick shape and cubicalª†-Fe2O3 nano particle with the grain size being 20 nm under lower temperature by using the action of particular organic additive and inorganic salt and employing ferric iron salt as raw material without the oxidation-reduction course. The invention is characterized by simple process and easy to control the particle shape.

Description

technical field [0001] The present invention relates to a preparation method of magnetic iron oxide nanoparticles, to be precise, relates to a rod-shaped or cubic γ-Fe 2 o 3 A method for preparing nanoparticles belongs to the technical field of preparation of inorganic non-metallic magnetic nanometer materials. Background technique [0002] γ-Fe 2 o 3 Due to its excellent magnetic properties, powder was first used as a magnetic recording material, and it also plays an extremely important role in many other applications. γ-Fe 2 o 3 Nanoparticles have broad application prospects in magnetic fluids, magnetic refrigeration, biomedicine, and information storage. [0003] Traditional preparation of γ-Fe 2 o 3 The powder method usually includes five steps: (1) preparation of α-FeOOH needle crystal seeds; (2) growing crystal α-FeOOH on the seeds; (3) dehydration of α-FeOOH into α-FeOOH by heating 2 o 3 ; (4) α-Fe 2 o 3 reduced to Fe 3 o 4 ; (5) ...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 姜继森姜国华丁建芳
Owner EAST CHINA NORMAL UNIV
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