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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

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Problems solved by technology

Hydrothermal method has been widely used in the synthesis of metal oxide nanostructures, but the hydrothermal synthesis of thermodynamically stable α-Fe 2 o 3 There are many reports, so far, the hydrothermal synthesis of metastable γ-Fe 2 o 3 Magnetic nanoparticles have been rarely reported

Method used

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

Examples

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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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