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Preparation method of superparamagnetic ferric oxide nanomaterial

A ferric tetroxide and superparamagnetic technology, applied in the directions of iron oxide/iron hydroxide, nanotechnology, nanotechnology, etc., can solve the problems of complex synthesis method, high cost and the like, achieve simple preparation method, high yield, Mild effect of preparation conditions

Inactive Publication Date: 2017-05-24
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the general synthesis method is complicated or requires high-cost additives

Method used

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  • Preparation method of superparamagnetic ferric oxide nanomaterial
  • Preparation method of superparamagnetic ferric oxide nanomaterial
  • Preparation method of superparamagnetic ferric oxide nanomaterial

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Embodiment 1

[0031] A kind of preparation method of superparamagnetic ferroferric oxide nanometer material, it comprises the following steps:

[0032] Step 1, the double-distilled water used for configuring the ferrous sulfate solution is first boiled to drive away the air, and the flask used for the reaction is ventilated with nitrogen for five minutes to drive away the air, so as to prevent the ferrous ions from being oxidized during the heating process of step 2; this embodiment In, the molar concentration of ferrous sulfate aqueous solution is 0.1mol / L, and the total volume is 15mL;

[0033] Step 2: Add 0.424g of lithium nitrate and sodium tungstate in an equimolar amount to ferrous sulfate, and heat at .65°C until completely dissolved to obtain a mixed solution. In the present embodiment, the molar concentration of lithium nitrate is 4.1mol / L;

[0034] Step 3, take out 1.5mL of the above solution and place it in a 25mL Teflon liner, add 100 μL of ammonia water, put the Teflon liner i...

Embodiment 2

[0038] Embodiment 2, with embodiment 1, wherein the concentration of ferrous sulfate and sodium tungstate is changed into 0.4mol / L, by figure 2 It can be seen that the Fe3O4 nanocrystals obtained at higher concentrations further grow into nanorods. pass Figure 4 It can be seen that as the nanocrystal grows, the superparamagnetism disappears, the maximum saturation magnetic flux drops to 6.94emu / g, the residual magnetization is 2.25emu / g, and the coercive force is 96.3.

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Abstract

The invention provides a preparation method of a superparamagnetic ferroferric oxide nanometer material and belongs to the technical field of magnetic material preparation. The method comprises the steps that ferrous sulfate, sodium tungstate and lithium nitrate are taken as raw materials, ferroferric oxide nanomete particles are generated by one step through hydrothermal reaction, and obtained nanocrystallines are subjected to high-temperature processing so to stabilize the structure after centrifugal drying. The preparation method is simple, one step forming is realized, and the reaction concentration and the yield are high; the preparation condition is relatively mild, 120 DEG C water heating is adopted, and additional pressurization is not required; the raw material cost is low, and the reaction is convenient to control; the product has excellent superparamagnetism and very high saturation flux.

Description

technical field [0001] The invention relates to the technical field of magnetic material preparation, in particular to a preparation method of a superparamagnetic iron ferric oxide nanometer material. Background technique [0002] Magnetic composite nanoparticles usually have two structures, one structure is based on magnetic nanoparticles (MagneticParticles, MP) as the core, a functional material is the shell; the other structure is the opposite, the shell is magnetic nanoparticles, including The magnetism of various composite structure substances such as hollow submicrospheres with nano-magnetic particles as the shell comes from the magnetic properties of electrons and nuclei inside the substance. Such a structure makes the magnetic nanocomposite material have the small size effect of nanomaterials, quantum effect, strong specific surface area, effects such as quantum tunneling, and other related properties of composite materials. [0003] The motion of any charged body n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/08B82Y30/00
CPCC01G49/08C01P2004/03C01P2004/16C01P2004/64C01P2006/42
Inventor 邢周昊吴庆生
Owner TONGJI UNIV
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