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Method for preparing gamma-Fe2O3 nano magnetic material

A nano-magnetic material and nano-powder technology, applied in iron oxide/iron hydroxide, iron oxide and other directions, can solve the problems of difficult to guarantee product quality, harsh process conditions, difficult process control, etc., and achieve short reaction time and high product purity. , the effect of low-cost raw materials

Inactive Publication Date: 2008-01-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some of these methods have complex operations, difficult process control, and difficult product quality assurance, and some have disadvantages such as large equipment investment, harsh process conditions, low yield, and difficulty in popularization and application.

Method used

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  • Method for preparing gamma-Fe2O3 nano magnetic material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 8.08g ferric nitrate, 4.0g urea, 10.0g ammonium oxalate, add 7.0ml deionized water. After fully stirring for 30 minutes, put it into an oven, and bake at 150°C for 5 hours to obtain a viscous mixture.

[0015] The above mixture was poured into a crucible, and put into a muffle furnace preheated to 400°C to react for 15 minutes to obtain the final product. The product is a lamellar structure composed of nanoparticles, with good crystallinity and a saturation magnetization of 49emu / g. The crystal phase composition of the product is shown in Figure 1.

Embodiment 2

[0017] Weigh 8.08g ferric nitrate, 5.0g urea, 15.0g ammonium oxalate, add 8.0ml deionized water. After fully stirring for 30 minutes, put it into an oven and bake at 130°C for 7 hours to obtain a viscous mixture. The above mixture was poured into a crucible, and put into a muffle furnace preheated to 500°C to react for 10 minutes to obtain the final product. The product is a lamellar structure composed of nanoparticles, with good crystallinity and a saturation magnetization of 48emu / g.

Embodiment 3

[0019] Weigh 8.08g ferric nitrate, 7.0g urea, 16.0g ammonium oxalate, add 11.0ml deionized water. After fully stirring for 30 minutes, put it into an oven and bake at 170°C for 5 hours to obtain a viscous mixture. The above mixture was poured into a crucible, and put into a muffle furnace preheated to 400°C to react for 25 minutes to obtain the final product. The product is a lamellar structure composed of nanoparticles, with good crystallinity and a saturation magnetization of 50 emu / g.

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Abstract

This invention discloses a method for preparing gamma-Fe203 nanometer magnetic material. The procedures are: ferrous nitrate and urea, ammonium oxalate solution are heated under 130-170deg.C for 4-9hrs, and then fed in a preheated environment of 300-600deg.C for 10-30minites, so obtaining this inventive gammer-fe203 nanometer powder. This invention has advantages of: simple process, safety, no need of protective atmosphere, short reaction time (10-30 minites), energy-saving, low cost of raw material, high yield, high pureness, definitive constituents and crystal-form, excellent magnetic property.

Description

technical field [0001] The invention relates to a method for preparing gamma-Fe 2 o 3 Methods for nanomagnetic materials. Background technique [0002] γ-Fe 2 o 3 It is a very widely used functional material. Due to its good magnetic, catalytic and gas-sensing properties and good absorption and shielding effects on ultraviolet rays, it is used as magnetic recording materials, magnetic liquids, electromagnetic wave absorption materials, gas sensors, catalysts, nonlinear optical materials, in electronics, petroleum It has good application prospects in fields such as chemical engineering, environmental protection and biomedical engineering. [0003] γ-Fe 2 o 3 The preparation has become a research hotspot. Preparation of γ-Fe 2 o 3 The most commonly used method for nanopowder is the liquid phase precipitation method, through precipitation, dehydration, reduction, reoxidation and other steps to obtain γ-Fe 2 o 3 . The process of this method is complicated, the outpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
Inventor 李春忠王素芬顾锋
Owner EAST CHINA UNIV OF SCI & TECH