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Method for preparing gamma-ferroso-ferric oxide nano-ring by oxidation process

A technology of ferric oxide and ferric oxide, applied in the directions of iron oxide/iron hydroxide, iron oxide, nanotechnology, etc., can solve the problems such as gamma-iron oxide that have not yet been seen, and achieve easy and large The effect of large-scale production, low production cost, and environmental protection in the production process

Inactive Publication Date: 2008-09-17
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Gamma-iron trioxide (γ-Fe 2 o 3 ) Relevant literature and patent reports of nanorings

Method used

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Examples

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Effect test

Embodiment 1

[0016] Take 9mmol / L iron trichloride aqueous solution, then add an equal volume of 3mmol / L sodium dihydrogen phosphate aqueous solution, stir well, transfer to polytetrafluoroethylene reactor, seal it and put it into 200℃ constant temperature oven, treat for 18h, then Take out the reaction kettle and cool it naturally in the air. The red precipitate in the kettle is separated by centrifugation, washed twice with water, and dried in the air at 60°C to obtain alpha-iron trioxide (α) with an inner diameter of 10nm and an outer diameter of 140nm. -Fe 2 O 3 ) Nano ring. Then, take 2g of iron trioxide (α-Fe 2 O 3 ) Nano ring, put it in a closed furnace, the volume ratio is 5% H 2 +95% Ar reducing gas, program the temperature to 350℃, maintain it at this temperature for 4h, and cool it naturally to room temperature to get ferroferric oxide (Fe 3 O 4 ) Nano ring. Then, take 1g of ferroferric oxide (Fe 3 O 4 ) Nano ring, put it in a furnace, heat up to 100 ℃ in air atmosphere, maintain at ...

Embodiment 2

[0018] Take 30mmol / L ferric chloride aqueous solution, and then add an equal volume of 6mmol / L sodium dihydrogen phosphate aqueous solution, stir evenly, transfer to a polytetrafluoroethylene reactor, seal it and put it in a 210℃ constant temperature oven, treat it for 36h, then Take out the reaction kettle and cool it naturally in the air. The red precipitate in the kettle is separated by centrifugation, washed with water 3 times, and dried in air at 80°C to obtain the inner diameter of 45nm and the outer diameter of 160nm to obtain alpha-iron trioxide. (α-Fe 2 O 3 ) Nano ring. Then, take 20g of iron trioxide (α-Fe 2 O 3 ) Nano ring, put it in a closed furnace, the volume ratio is 10%H 2 +90%N 2 The reducing gas is programmed to 400°C, maintained at this temperature for 2h, and naturally cooled to room temperature, then ferroferric oxide (Fe 3 O 4 ) Nano ring. Then, take 10g of ferroferric oxide (Fe 3 O 4 ) Nano ring, put it in the furnace, heat up to 200℃ in air atmosphere, main...

Embodiment 3

[0020] Take 40mmol / L ferric chloride aqueous solution, and then add an equal volume of 9mmol / L sodium dihydrogen phosphate aqueous solution, stir evenly, transfer to a polytetrafluoroethylene reactor, seal it and put it in a 240℃ constant temperature oven, treat for 45h, then Take out the reaction kettle and let it cool naturally in the air. The red precipitate in the kettle is separated by centrifugation, washed with water 4 times, and dried in the air at 70°C to obtain Alpha-FeO3 with an inner diameter of 80nm and an outer diameter of 150nm. (α-Fe 2 O 3 ) Nano ring. Then, take 200g of iron trioxide (α-Fe 2 O 3 ) Nano ring, put it in a closed furnace, pass in reducing gas with a volume ratio of 20% CO + 80% Ar, program the temperature to 500 ℃, maintain at this temperature for 1.5 hours, and naturally cool to room temperature, you can get four Ferric oxide (Fe 3 O 4 ) Nano ring. Then, take 100g of ferroferric oxide (Fe 3 O 4 ) Nano ring, put it in the furnace, heat up to 400℃ in ...

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Abstract

An oxidation method for producing Gamma-ferric oxide nanorings comprises the steps of collecting ferric trichloride aqueous solution, adding equivoluminal sodium dihydrogen phosphate aqueous solution, stirring, placing into a sealed reaction vessel, sealing, performing constant temperature treatment at 180-270 DEG C for 12-72 hours, taking out of the reaction vessel, air cooling, separating red precipitate in the vessel, water washing, and oven-drying to obtain Alpha-ferric oxide nanorings; placing into a sealed furnace, introducing reducing gas, heating to 300-600 DEG C, keeping at the temperature for 1-10 hours, and naturally cooling to room temperature to obtain ferroferric oxide nanorings; and adding into the furnace, heating to 100-600 DEG C under oxidative atmosphere, keeping at the temperature for 1-5 hours, and naturally cooling to room temperature to obtain Gamma-ferric oxide nanorings. The inventive method has the advantages of simple equipment, simple production and operation, good product reproducibility, low cost, no pollution, and applicability to large-scale production.

Description

Technical field [0001] The invention belongs to a method for preparing nanorings, and specifically relates to an oxidation method for preparing gamma-iron trioxide (γ-Fe 2 O 3 ) Nanoring method. technical background [0002] Due to the quantum size effect, small size effect, surface effect, macroscopic quantum tunneling effect, Coulomb blockage, and dielectric confinement effect of nanoparticles, they are used in optical, electrical, magnetic, thermal, mechanical, chemical, and biophysical properties, etc. All aspects showed new characteristics different from conventional solids and macroscopic particles. The performance of nanomaterials is largely determined by the microscopic morphology of nanoparticles, so the synthesis of nanoparticles with various special morphologies has become an indispensable and important part of the field of nanoscience. [0003] Iron oxide is a cheap and environmentally friendly transition metal oxide. Its nano-structured particles have good weather re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82B3/00
Inventor 孙予罕吕宝亮吴东徐耀
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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