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Ferrate magnetic nanocomposite with core-shell structure, preparation method and application thereof

A core-shell structure, magnetic nanotechnology, applied in the field of nanomaterials, can solve the problems of difficulty in preparing nanocrystalline magnets with fine grains, too simple calculation models, and unsatisfactory effects, achieving less toxic side effects and controllable reactions. Strong, good contrast effect

Inactive Publication Date: 2013-05-08
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Therefore, in recent years, many scholars have improved the microstructure of nanocomposite magnetic materials by adding different elements, such as Cu, Al, Ti, etc., and then improved the magnetic properties of the materials, but the effects are not ideal, resulting in the The magnetic energy product is much lower than the theoretical value
The reason: on the one hand, the theoretical calculation model is too simple; on the other hand, it is difficult to prepare nanocrystalline magnets with fine and uniform grains experimentally.

Method used

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  • Ferrate magnetic nanocomposite with core-shell structure, preparation method and application thereof
  • Ferrate magnetic nanocomposite with core-shell structure, preparation method and application thereof
  • Ferrate magnetic nanocomposite with core-shell structure, preparation method and application thereof

Examples

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Embodiment 1

[0027] Embodiment 1 Preparation of core-shell structure manganese ferrite magnetic nanocomposite material

[0028] (1) CoFe 2 o 4 Preparation of nanoparticles:

[0029] Dissolve 1 mmol of cobalt acetylacetonate precursor and 2 mmol of iron acetylacetonate precursor in 20 mL of an organic solvent composed of oleic acid, oleylamine and benzyl ether, wherein 2 mL of oleic acid and 2 mL of oleylamine in the organic solvent , benzyl ether is 20mL, ultrasonically mixed for 20 minutes, so that the added precursor and organic solvent are mixed evenly; then add 10mmol of 1,2-hexadecanediol, and magnetically stir the mixed solution; the mixed solution is evacuated and then passed into nitrogen , the reaction system was heated up to 200° C. for 2 hours within 20 minutes and reacted for 2 hours under the protection of nitrogen, and then raised to 300° C. for 1 hour within 20 minutes. Remove the heat source, cool the system to room temperature, add 50mL of absolute ethanol to the reacti...

Embodiment 2

[0033] Example 2 Preparation of core-shell structure zinc ferrite magnetic nanocomposite material

[0034] (1) CoFe 2 o 4 The preparation method of nanoparticles is the same as in Example 1.

[0035] (2) Preparation of core-shell zinc ferrite magnetic nanocomposites:

[0036] Dissolve the precursors of 1 mmol of zinc acetylacetonate and 2 mmol of iron acetylacetonate in 20 mL of organic solvent composed of oleic acid, oleylamine and benzyl ether, wherein 2 mL of oleic acid, 2 mL of oleylamine, and benzyl ether in the organic solvent 20mL, ultrasonically mixed for 18 minutes, so that the added precursor and organic solvent were evenly mixed; then 10mmol of 1,2-hexadecanediol and the CoFe prepared in step (1) were added 2 o 4 Nanoparticles 84 mg, magnetically stirred the mixed solution; the mixed solution was evacuated and nitrogen gas was introduced, and the reaction system was under the protection of nitrogen gas, and the temperature of the mixed solution was raised to 300°C...

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Abstract

The invention belongs to the technical field of a nano material, and particularly relates to a ferrate magnetic nanocomposite with a core-shell structure, and a preparation method thereof. The magnetic nanocomposite is applied to a magnetic resonance imaging contrast agent; the nanocomposite takes CoFe2O4 as a core; a ferrate shell layer is wrapped at the surface; and the particle size of the material is 5-20nm. The preparation method comprises the steps of dissolving diacetone zinc / manganese and diacetone iron into an organic solvent; ultrasonically mixing and then adding CoFe2O4 nano particles and 1,2-hexadecanediol; magnetically stirring to obtain a mixed solution; heating the mixed solution under the inert gas atmosphere, cooling reaction liquid; adding absolute ethyl alcohol to the reaction liquid and carrying out centrifugal separation, freezing and drying to obtain a sample. The nano material is even in particle size, good in water-solubility, small in toxic and side effects, good in imaging effect, simple in preparation process of the material, and strong in reaction controllability, and can be used as a T2 contrast agent in magnetic resonance imaging detection.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a core-shell structure ferrite magnetic nanocomposite material and a preparation method thereof and the application of the magnetic nanocomposite material to a magnetic resonance contrast agent. Background technique [0002] Ferrite nanomaterials have stable chemical properties, mild saturation magnetic field and good ferromagnetism, so they are widely used in drug targeting, catalytic reaction, adsorption and separation, etc., and become a research hotspot in this field. The magnetic nanocomposites, due to the exchange coupling interaction between the crystal grains, present obvious remanence enhancement effect and single-phase ferromagnetism. Theoretical studies show that magnetic nanocomposites can have both high coercive force of hard magnetic phase and high saturation magnetization of soft magnetic phase, so as to realize high magnetic energy product....

Claims

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Application Information

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IPC IPC(8): A61K49/06
Inventor 杨仕平李向远胡鹤王亚培孙金于超王俊
Owner SHANGHAI NORMAL UNIVERSITY
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