Preparation method for gamma-Fe2O3 magnetic nano particles

A magnetic nanoparticle and nanoparticle technology, applied in the direction of inorganic material magnetism, iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of few reports on magnetic nanoparticles, and achieve good crystallization and dispersion effects

Inactive Publication Date: 2008-02-20
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrothermal method has been widely used in the synthesis of metal oxide nanostructures, but the hydrothermal synthesis of thermodynamically stable

Method used

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  • Preparation method for gamma-Fe2O3 magnetic nano particles
  • Preparation method for gamma-Fe2O3 magnetic nano particles

Examples

Experimental program
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Embodiment 1

[0017] 1.7793 grams of ferrous sulfate (FeSO 4 ·7H 2 O), dissolved in 160 ml deionized water, FeSO 4 The molar concentration is 0.04 mol / liter, and after stirring for 5 minutes, adding 0.7538 gram of concentration is 85% hydrazine hydrate (N 2 h 4 ·H 2 (2), the hydrazine hydrate molar concentration is 0.08 mol / liter, after stirring for 5 minutes, put the above-mentioned prepared solution into the polytetrafluoroethylene lining of the autoclave, the lining volume is 200 milliliters, that is, the filling degree is 80% . The solution was treated at 150°C for 12 hours, and the treated solution was centrifuged to obtain black Fe 3 o 4 nanoparticles, the resulting Fe 3 o 4 is 0.0021 mol. Then the above Fe 3 o 4 The nanoparticles and 1.2092 grams of mass concentration are 30% hydrogen peroxide solution (containing 0.011 moles of hydrogen peroxide) to add the polytetrafluoroethylene lining of the autoclave together, add deionized water to adjust the filling degree to be 80%...

Embodiment 2

[0020] 0.5004 grams of ferrous sulfate (FeSO 4 ·7H 2 O), dissolved in 180 ml deionized water, FeSO 4 Molar concentration 0.01 mol / liter, after stirring for 5 minutes, add 0.72 gram of sodium hydroxide again, sodium hydroxide molar concentration 0.1 mol / liter, stir 5 minutes, finally add 1.0601 gram of mass concentration and be 85% hydrazine hydrate (N 2 h 4 ·H 2 (2), the hydrazine hydrate molar concentration is 0.1 mol / liter, after stirring for 5 minutes, put the above-mentioned prepared solution into the polytetrafluoroethylene lining of the autoclave, the lining volume is 200 milliliters, that is, the filling degree is 90% . The solution was treated at 100°C for 100 hours, and the treated solution was centrifuged to obtain black Fe 3 o4 nanoparticles, the resulting Fe 3 o 4 6x10 -4 Moore. Then the above Fe 3 o 4 Nanoparticles and 2.04 grams of mass concentration are 30% hydrogen peroxide solution (containing 0.018 moles of hydrogen peroxide) to add the polytetrafl...

Embodiment 3

[0022] 33.7977 grams of ferrous chloride (FeCl 2 4H 2 O), dissolved in 170 ml deionized water, FeCl 2 Molar concentration 1.0 mol / liter, after stirring 5 minutes, add 6.8 gram sodium hydroxide again, sodium hydroxide molar concentration 1.0 mol / liter, stir 5 minutes, add 10.012 gram mass concentration at last and be 85% hydrazine hydrate (N 2 h 4 ·H 2 (2), the molar concentration of hydrazine hydrate is 1.0 mol / liter, after stirring for 5 minutes, put the above-mentioned prepared solution into the polytetrafluoroethylene lining of the autoclave, the lining volume is 200 milliliters, that is, the filling degree is 85% . The solution was treated at 200°C for 4 hours, and the treated solution was centrifuged to obtain black Fe 3 o 4 nanoparticles, the resulting Fe 3 o 4 is 0.057 mol. Then the above Fe 3 o 4 The nanoparticles and 6.4599 grams of mass concentration are 30% hydrogen peroxide solution (containing 0.057 moles of hydrogen peroxide) to add the polytetrafluoro...

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Abstract

The invention discloses a preparation method of Gamma-Fe2O3 magnetic nanometer particles. The invention adopts a two-step hydro-thermal method and synthesizes maghemite (Gamma-Fe2O3) nanometer particles. Step 1: with ferrous salt, sodium hydroxide and hydrazine hydrate as raw materials, black Fe3O4 nanometer particles are synthesized by a hydro-thermal method. Step 2: with oxyful as oxidant, the black Fe3O4 nanometer particles obtained at Step 1 is thermal oxidized into mahogany Gamma-Fe2O3 nanometer particles. The Gamma-Fe2O3 nanometer particles obtained by the invention with particle size being 50-100 nanometers has excellent crystallization and dispersion and is magnetic with saturated magnetization rate being 68emu/g.

Description

technical field [0001] The present invention relates to a kind of gamma-Fe 2 o 3 Preparation method of magnetic nanoparticles. Background technique [0002] Iron trivalent oxide (Fe 2 o 3 ) There are four isomers, namely hematite (α-Fe 2 o 3 ), β-Fe 2 o 3 , Maghemite (γ-Fe 2 o 3 ) and ε-Fe 2 o 3 , where α-Fe 2 o 3 and γ-Fe 2 o 3 Most common (R. Zboril et al. Chem. Mater., 14, 969 (2002)). Relative to α-Fe 2 o 3 , γ-Fe 2 o 3 It has excellent magnetic properties and is widely used in the field of magnetic storage, such as magnetic tapes (W.P. Osmond, Proc. Phys. Soc. Lond., B65, 121 (1952)). α-Fe 2 o 3 It is a trigonal crystal system with a corundum structure, which exists stably in nature and is called hematite. γ-Fe 2 o 3 It is a cubic crystal system with a spinel structure, which is metastable in nature and is called maghemite. With increasing temperature, γ-Fe 2 o 3 Easily converted to α-Fe 2 o 3 , thus losing the magnetism. Therefore, the hi...

Claims

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Application Information

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IPC IPC(8): C01G49/06H01F1/11
Inventor 祝洪良杨红朱鲁明金达莱姚奎鸿
Owner ZHEJIANG SCI-TECH UNIV
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