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Preparation method of Fe3O4 nanoparticle

A technology of ferroferric oxide and nanoparticles, which is applied in the direction of iron oxide/hydroxide, nanotechnology, nanotechnology, etc., and can solve the problems of large particle size, high reaction temperature, and wide particle size range of ferroferric oxide. Achieve the effects of small remanence and coercive force, good dispersion and good stability

Active Publication Date: 2019-02-15
于晓峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the particle size of ferric oxide that this method makes is bigger, and cost is high, and particle size range is wider, and reaction temperature is high, and operation is complicated

Method used

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  • Preparation method of Fe3O4 nanoparticle
  • Preparation method of Fe3O4 nanoparticle
  • Preparation method of Fe3O4 nanoparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of ferric oxide nanoparticles is carried out according to the following steps:

[0042] (1) Water-soluble Fe 2+2000 grams of salt, specifically ferrous chloride salt, is dissolved in a reaction kettle with 30L of distilled water equipped with an ultrasonic generator, heated to 40-60°C, stirred and added with 1000-1600ml of ammonia water, and the pH of the reaction solution is adjusted to between 6-9 In between, add 2-6% (sodium oleate + sodium dodecylbenzenesulfonate) combined dispersant, heat up to 60-80°C, and turn on the ultrasonic generator, the ultrasonic power is controlled at 1.5kw, and the frequency is 28KHz .

[0043] (2) After reacting for 2-5 hours, the solution turns black, and the temperature is raised to 80-90° C. for aging for 1 hour, and then the reaction is stopped. After the solution was cooled to 50°C, the reaction product was centrifuged to remove the liquid to obtain a solid, and the solid was washed with deionized water unt...

Embodiment 2

[0049] The preparation method of ferric oxide nanoparticles is carried out according to the following steps:

[0050] (1) Water-soluble Fe 2+ 3000 grams of salt (comprising ferrous chloride salt and ferrous sulfate salt), dissolved in a reaction kettle with 30L distilled water equipped with an ultrasonic generator, heated up to 40-60°C, stirred and added 500-1000g sodium hydroxide, adjusted The pH of the reaction solution is between 6-9, then add 2-6% (sodium oleate + sodium dodecylbenzenesulfonate) combined dispersant, after heating up to 60-80°C, add 100 grams of sodium carbonate, and open Ultrasonic generator, the ultrasonic power is controlled at 1kw, and the ultrasonic frequency is 40KHz.

[0051] (2) After reacting for 3-4 hours, the solution turns black, and the temperature is raised to 80-90° C. for aging for 1 hour, and then the reaction is stopped. After the solution was cooled to 40°C, the reaction product was centrifuged at 5000rpm to remove the liquid to obtain ...

Embodiment 3

[0057] The preparation method of ferric oxide nanoparticles is carried out according to the following steps:

[0058] (1) Water-soluble Fe 2+ 2000 grams of salt (comprising ferrous chloride salt and ferrous sulfate salt), be dissolved in the reactor that fills the configuration ultrasonic generator of 30L distilled water, be warming up to 40-60 ℃, stir and add 1000-1600ml ammoniacal liquor (25wt% concentration ), adjust the pH of the reaction solution between 6-9, then add 2-6% (sodium oleate + sodium dodecylbenzenesulfonate) combined dispersant, after the temperature rises to 60-80°C, add 300 grams of sodium carbonate , and turn on the ultrasonic generator, the ultrasonic power is controlled at 2.0kw, and the ultrasonic frequency is 40KHz.

[0059] (2) After reacting for 4-5 hours, the solution turns black, and the temperature is raised to 80-90°C for aging for 1 hour, and then the reaction is stopped. After the solution was cooled to 40°C, the reaction product was centrifu...

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Abstract

The invention provides a Fe3O4 nanoparticle and a preparation method thereof. The particle size of the nanoparticle is between 20 and 30nm, the saturation magnetization strength is 70emu / g or above 70emu / g, the residual magnetism 0.2emu / g or below 0.2emu / g and the coercivity is 1.0Oe or below 1.0Oe. The preparation method comprises the following steps: (A) dissolving ferrous salt to form a reaction solution, adding alkali to regulate the pH value of the reaction solution to 6 to 9 and carrying out ultrasonic reaction at 60 to 80 DEG C for 2 to 6 hours; (B) raising the temperature to 80 to 90 DEG C, reacting and curing for 0.5 to 1.5 hours, cooling, centrifuging and carrying out vacuum drying to obtain a finished product. The Fe3O4 nanoparticle prepared with the method has the advantages ofrelatively narrow particle size range, excellent magnetic performance, high saturation magnetization strength, weak residual magnetism and very low coercivity; in microstructure, the easy magnetization directions among the nanoparticles are identical; the Fe3O4 nanoparticle shows good super-paramagnetism.

Description

technical field [0001] The invention relates to the field of preparation of nanomaterials, in particular to a preparation method of iron ferric oxide nanoparticles. Background technique [0002] With the development of nanotechnology, the application prospects of magnetic nanoparticles have been greatly expanded. The superparamagnetism, surface effect, small size effect and other properties exhibited by nano-ferroferric oxide make it widely used in magnetic sealing, magnetic liquid materials, quantum tunneling effect, special catalyst raw materials, contrast imaging, targeted drug delivery, cell separation, It shows special functions in heavy metal adsorption and other aspects. There are mainly two methods for preparing nanometer iron ferric oxide particles: physical methods and chemical methods. [0003] Nanoparticles prepared by physical methods generally have low purity, uneven particle distribution, and irregular morphology, so physical preparation methods are basicall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08B82Y30/00
CPCB82Y30/00C01G49/08C01P2002/72C01P2004/03C01P2004/64
Inventor 于晓峰
Owner 于晓峰
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