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Method for preparing Fe2O3 Nano particles clad by Fe2O3

A nanoparticle, fe2o3 technology, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of complicated coating process and so on

Inactive Publication Date: 2007-10-10
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These studies will help to improve the Fe 3 o 4 Dispersion and biocompatibility of nanoparticles, but the coating process is complicated

Method used

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  • Method for preparing Fe2O3 Nano particles clad by Fe2O3
  • Method for preparing Fe2O3 Nano particles clad by Fe2O3
  • Method for preparing Fe2O3 Nano particles clad by Fe2O3

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of Fe by co-precipitation method 3 o 4 Nanoparticles. Boil in distilled water for 20 minutes, and then pass nitrogen gas for 30 minutes to prepare 25ml of deoxygenated distilled water and 0.85ml of HCl with a concentration of 36% to 38%, mix in a container until the pH of the solution is 1, then add FeCl 3 ·6H 2 O and FeCl 2 4H 2 O makes a solution of iron salts. In the prepared iron salt solution, FeCl 3 ·6H 2 The concentration of O is 1mol / L, FeCl 2 4H 2 The concentration of O is 0.5mol / L. Add 25ml of the iron salt solution dropwise to 250ml of NaOH solution with a concentration of 1.5mol / L under stirring at 15°C. After the addition is completed, continue to react for 30min, and pass nitrogen gas during the whole reaction process. protection, after the reaction is completed, settle under an external magnetic field, remove the supernatant, and then wash the residue three times with deoxygenated distilled water, then wash with ethanol, centrifuge, a...

Embodiment 2

[0021] Boil in distilled water for 20 minutes, and then pass nitrogen gas for 30 minutes to prepare 25ml of deoxygenated distilled water and 0.85ml of HCl with a concentration of 36% to 38%, mix in a container until the pH of the solution is 1, then add FeCl 3 ·6H 2 O and FeCl 2 4H 2 O makes a solution of iron salts. In the prepared iron salt solution, FeCl3 ·6H 2 The concentration of O is 1.28mol / L, FeCl 2 4H 2 The concentration of O is 0.64mol / L. Add 25ml of the iron salt solution dropwise to 250ml of NaOH solution with a concentration of 0.8mol / L under stirring at 30°C, and a black precipitate is formed immediately. After the addition is completed, continue the reaction for 45min. The whole reaction process was protected by nitrogen gas. After the reaction is completed, settle under an external magnetic field, remove the supernatant, and wash the residue three times with deoxygenated distilled water, then wash with ethanol, centrifuge, and vacuum-dry at 50°C to obtain...

Embodiment 3

[0024] Boil in distilled water for 20 minutes, and then pass nitrogen gas for 30 minutes to prepare 25ml of deoxygenated distilled water and 0.85ml of HCl with a concentration of 36% to 38%, mix in a container until the pH of the solution is 1, then add FeCl 3 ·6H 2 O and FeCl 2 4H 2 O makes a solution of iron salts. In the prepared iron salt solution, FeCl 3 ·6H 2 The concentration of O is 1.28mol / L, FeCl 2 4H 2 The concentration of O is 0.64mol / L. Add 25ml of the iron salt solution dropwise to 250ml of NaOH solution with a concentration of 1.0mol / L under stirring at 50°C. After the addition is completed, continue to react for 90min, and pass nitrogen gas during the whole reaction process. protection, after the reaction is completed, settle under an external magnetic field, remove the supernatant, and then wash the residue three times with deoxygenated distilled water, then wash with ethanol, centrifuge, and dry under vacuum at 50 ° C to finally obtain Fe 3 o 4 Predom...

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Abstract

This invention provides a method for preparing Fe2O3-encapsulated Fe3O4 nanoparticles. The method comprises: preparing Fe3O4 by co-precipitation, converting gamma-FeOOH encapsulating Fe3O4 grains into Fe2O3 by heating at a low temperature, and forming Fe2O3-encapsulated Fe3O4 nanoparticles. XRD results show that the peaks of the product are identical to the standard peaks of gamma-Fe2O3 and Fe3O4, which proves that alpha-FeOOH, is converted into gamma-Fe2O3 that encapsulates Fe3O4 after calcination. The Fe2O3-encapsulated Fe3O4 nanoparticles have enhanced superparamagnetism, thus can be used for magnetic recording, magnetic flux, magnetic sealing, lubrication, magnetic resonance imaging, biological magnetic separation, magnetic targeting drugs and thermal therapy.

Description

technical field [0001] The invention belongs to the field of magnetic nanometer materials, in particular to a method for preparing magnetic nanoparticle with a core-shell structure. Background technique: [0002] Magnetic nanoparticles have been widely used in magnetic recording, magnetic fluid, magnetic sealing, lubrication and so on. In recent years, magnetic nanoparticles have received great attention in some biologically related fields, and have been applied in magnetic resonance imaging, biological magnetic separation, etc., and also have important application prospects in magnetically targeted drugs and hyperthermia. [0003] Nano Fe 3 o 4 It has attracted people's attention because of its strong superparamagnetism, convenient preparation, and suitability for biomedical applications. For nano Fe 3 o 4 There have been many reports on the preparation of [1-3] ,(references: [0004] [1] Massart R. Preparation of Magnetic Nanoparticles. IEEE Trans Magn, 1981, MAG-17...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08C01G49/06B82B3/00
Inventor 洪广言高倩
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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