Microwave synthetic method for water soluble magnetic cobalt-ferrite CoFe2O4 nano crystal

A technology of cobalt ferrite and nanocrystals, which is applied in the field of nanomaterial preparation to achieve the effects of simple operation, strong magnetic properties, and easy connection

Inactive Publication Date: 2007-09-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of water-soluble magnetic cobalt ferrite CoFe 2 o 4 Microwave Synthesis of Nanocrystals, Synthesis of High Quality Cobalt Ferrite CoFe in Aqueous Phase 2 o 4 Magnetic nanocrystals, which have the advantages of fast synthesis speed, good water solubility and good monodispersity of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Preparation of reaction precursor solution:

[0018] Cobalt chloride (divalent) and ferric chloride with a molar ratio of 1:2 are dissolved in water, the iron concentration is 0.01 mol / liter, glycerol is added as a stabilizer, and the volume ratio of glycerol to water is controlled at 1 : 1. Adjust the pH of the solution to 12.

[0019] 2. Microwave synthesis of cobalt ferrite CoFe 2 o 4 Nanocrystals:

[0020] Put the above precursor solution in a closed polytetrafluoroethylene tank and react in a microwave reactor with controllable temperature and pressure to generate cobalt ferrite CoFe 2 o 4 nanocrystals.

[0021] The microwave heating conditions are:

[0022] Microwave oscillation frequency: 2450MHZ,

[0023] Microwave power: 400W,

[0024] Heating time: 4 hours,

[0025] Heating temperature: 140 degrees Celsius.

Embodiment 2

[0027] 1. Preparation of reaction precursor solution:

[0028] Dissolve cobalt sulfate and ferric sulfate with a molar ratio of 1:2 in water with an iron concentration of 0.04 mol / liter, add ethylene glycol as a stabilizer, and control the volume ratio of ethylene glycol to water at 1:2. Adjust the pH of the solution to 8 to obtain a precursor solution.

[0029] 2. Microwave synthesis of cobalt ferrite CoFe 2 o 4 Nanocrystals:

[0030] Put the above precursor solution in a closed polytetrafluoroethylene tank and react in a microwave reactor with controllable temperature and pressure to generate cobalt ferrite CoFe 2 o 4 nanocrystals.

[0031] The microwave heating conditions are:

[0032] Microwave oscillation frequency: 2450MHZ,

[0033] Microwave power: 600W,

[0034] Heating time: 30 minutes,

[0035] Heating temperature: 160 degrees Celsius.

Embodiment 3

[0037] 1. Preparation of reaction precursor solution:

[0038] Dissolve cobalt nitrate salt and iron nitrate salt with a molar ratio of 1:2 in water, the concentration of iron salt is 0.1 mol / liter, add polyethylene glycol as a stabilizer, and control the volume ratio of polyethylene glycol to water at 1:4 . Adjust the pH of the solution to 10 to obtain a precursor solution.

[0039] 2. Microwave synthesis of cobalt ferrite CoFe 2 o 4 Nanocrystals:

[0040] Put the above precursor solution in a closed polytetrafluoroethylene tank and react in a microwave reactor with controllable temperature and pressure to generate cobalt ferrite CoFe 2 o 4 nanocrystals.

[0041] The microwave heating conditions are:

[0042] Microwave oscillation frequency: 2450MHZ,

[0043] Microwave power: 100W,

[0044] Heating time: 2 hours,

[0045] Heating temperature: 200 degrees Celsius.

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Abstract

The present invention relates to microwave synthesis process of water soluble magnetic nanometer cobalt ferrite CoFe2O4 crystal. Through dissolving bivalent cobalt salt and trivalent iron salt in water, adding water soluble polyol as stabilizer and regulating pH value of the solution, alkali reactant precursor solution is prepared. The reactant precursor solution is then set inside a sealed PTFE tank and reacted in a microwave reactor at controlled temperature and pressure to synthesize nanometer cobalt ferrite CoFe2O4 crystal fast. The said process is simple, mild in reaction condition and low in cost, and the synthesized nanometer cobalt ferrite CoFe2O4 crystal has water solubility, high stability, high magnetism, homogeneous size distribution, adjustable size, easy connection with biomacromolecule and other features.

Description

technical field [0001] The invention relates to a water-soluble magnetic cobalt ferrite CoFe 2 o 4 A microwave synthesis method for nanocrystals, using ferric iron and divalent cobalt salts as raw materials, using temperature-controlled and pressure-controlled microwave synthesis technology to prepare cobalt ferrite CoFe 2 o 4 A magnetic nano crystal belongs to the technical field of nano material preparation. Background technique [0002] Cobalt ferrite CoFe 2 o 4 The bulk material is a ferromagnetic compound. When nano cobalt ferrite CoFe 2 o 4 When the particle size is about 3-10 nanometers, due to the scale quantum effect and the dielectric confinement effect, they exhibit superparamagnetic properties, that is, they are magnetic in the presence of a magnetic field and non-magnetic when the magnetic field disappears. This material with special properties has a wide range of applications in nuclear magnetic resonance imaging, targeted drug therapy, separation of bi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00C01G51/00C01B13/36
Inventor 任吉存李良
Owner SHANGHAI JIAO TONG UNIV
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