Superparamagnetic Fe3O4 coated by oleic acid and preparation method thereof

A superparamagnetic, fe3o4 technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, it can solve the problems that nanoparticles are not easy to wash, require high process equipment, and harsh reaction conditions. Uniform size, high purity and good stability

Active Publication Date: 2017-02-15
SHANGHAI MAJORBIO BIO PHARM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction conditions required by the hydrothermal method are harsh, not easy to control, relatively difficult to

Method used

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  • Superparamagnetic Fe3O4 coated by oleic acid and preparation method thereof
  • Superparamagnetic Fe3O4 coated by oleic acid and preparation method thereof
  • Superparamagnetic Fe3O4 coated by oleic acid and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] (1) In the air, 7g FeCl 2 4H 2 O was added to 50 mL of deionized water to obtain a concentration of 0.14 g / mL of FeCl 2 aqueous solution. to 50mL FeCl 2 Add 30 mL of ammonia water to the aqueous solution, and after stirring for 20 minutes, the color gradually turns light green, then dark green, and finally black;

[0038] (2) Add 1.1 g of oleic acid to step (1), mix evenly, place the mixed solution in a closed reaction kettle, heat and react at 110°C for 4 hours, then alternately wash twice with deionized water and ethanol , after magnetic separation, disperse in n-hexane to obtain the black superparamagnetic nano Fe coated with oleic acid 3 o 4 1. The particle size is 12.0±3.26nm, and the average particle size is 12nm.

Embodiment 2

[0040] (1) In the air, 10g FeCl 2 4H 2 O was added to 100 mL of deionized water to obtain a concentration of 0.10 g / mL of FeCl 2 aqueous solution. to 100mL FeCl 2 Add 10 mL of ammonia water to the aqueous solution, and after stirring for 60 minutes, the color gradually turns light green, then dark green, and finally black;

[0041] (2) Add 1 g of oleic acid to step (1), mix evenly, place the mixed solution in a closed reaction kettle, heat and react at 60° C. for 5 hours, then alternately wash twice with deionized water and ethanol, After magnetic separation, disperse in octyl hexane to obtain the black superparamagnetic nano Fe coated with oleic acid 3 o 4 2. The average particle size is 8nm.

Embodiment 3

[0043] (1) In the air, 50g FeCl 2 4H 2 O was added to 100 mL of deionized water to obtain a concentration of 0.50 g / mL of FeCl 2 aqueous solution. to 100mLFeCl 2 Add 50mL of ammonia water to the aqueous solution, and after stirring for 90 minutes, the color gradually turns light green, then dark green, and finally black;

[0044] (2) Add 5g of oleic acid to step (1), after mixing evenly, place the mixed solution in a closed reaction kettle, heat and react at 90°C for 5 hours, then alternately wash each three times with deionized water and ethanol, and magnetically After separation, disperse in n-octane to obtain the black superparamagnetic nano Fe coated with oleic acid 3 o 4 3. The average particle size is 20nm.

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Abstract

The invention provides a preparation method for superparamagnetic Fe3O4 coated by oleic acid. The preparation method comprises the following steps: adding ammonia water into an aqueous solution of divalent ferric salt in air and carrying out stirring; and adding oleic acid, carrying out uniform mixing and then carrying out a heating reaction at 60 to 130 DEG C for 3 to 5 h so as to obtain the superparamagnetic Fe3O4 coated by oleic acid. The preparation method provided by the invention integrates the advantages of a hydrothermal method and a coprecipitation method to prepare superparamagnetic nanometer Fe3O4 and overcomes the defect of demand for high temperature of the hydrothermal method and the defect of demand for nitrogen protection of the coprecipitation method. The prepared superparamagnetic nanometer Fe3O4 is purely black, which indicates that nanometer Fe3O4 has high purity; and the prepared nanometer Fe3O4 is near-spherical, has a good crystal structure and is applicable to preparation of immunomagnetic beads.

Description

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Claims

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Application Information

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Owner SHANGHAI MAJORBIO BIO PHARM TECH
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