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Preparation method of high-saturation magnetization superparamagnetic porous ferrite microspheres

A superparamagnetic and porous microsphere technology, applied in chemical instruments and methods, iron oxide/iron hydroxide, diamagnetic/paramagnetic materials, etc. The magnetic properties of microspheres and nanocrystalline assemblies have a single structure, etc., to achieve the effects of green and non-toxic raw materials, good magnetic response performance, and high saturation magnetization.

Active Publication Date: 2020-04-28
ZHOUKOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Invention patent CN107140695B provides a method for preparing ferrite nanocrystal assemblies by solvothermal method, which utilizes solvothermal method to regulate and prepare ferrite nanocrystal assemblies with two different structures, positive spinel and trans spinel, and solves the problem of The technical problem of multi-component inorganic non-metallic ferrite material nanocrystalline assembly structure is single, but the magnetic properties of ferrite microspheres synthesized when polyethylene glycol is used as an interface modifier usually show ferromagnetic or ferrimagnetic properties , cannot obtain microspheres with superparamagnetic properties. In addition, the specific surface area of ​​the nanocrystalline assembly prepared by it is not high, which limits its application field

Method used

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  • Preparation method of high-saturation magnetization superparamagnetic porous ferrite microspheres
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  • Preparation method of high-saturation magnetization superparamagnetic porous ferrite microspheres

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Embodiment 1

[0035] Embodiment 1 A kind of preparation method of highly saturated magnetized superparamagnetic ferrite porous microsphere

[0036] A high saturation magnetization superparamagnetic Fe 3 o 4 The preparation of porous microspheres, the preparation process comprises the following steps:

[0037] 1. Superparamagnetic Fe 3 o 4 Synthesis of microspheres

[0038] (1) Preparation of precursor solution

[0039] At room temperature, 15 mmol ferric chloride hexahydrate and 150 mmol anhydrous sodium acetate were dissolved in 60 mL of ethylene glycol, and the ethylene glycol solution of ferric chloride hexahydrate was slowly added to the ethyl alcohol solution of anhydrous sodium acetate. In the diol solution, stir for 30min under magnetic stirring, mix evenly, and then add polyacrylic acid (M w 1800) 0.4 g was added to the above mixed solution, and the stirring was continued for 2 h to obtain a uniform yellow precursor solution.

[0040] (2) Heating reaction

[0041]Transfer th...

Embodiment 2

[0060] Example 2 A preparation method of highly saturated magnetized superparamagnetic ferrite porous microspheres

[0061] A High Saturation Magnetization Superparamagnetic Porous MnFe 2 o 4 The preparation of microspheres, the preparation process comprises the following steps:

[0062] 1. Superparamagnetic MnFe 2 o 4 Synthesis of microspheres

[0063] (1) Preparation of precursor solution

[0064] At room temperature, 5 mmol MnCl 2 , 10mmolFeCl 3 ·6H 2 O was dissolved in 60mL of ethylene glycol, weighed 150mmol of anhydrous sodium acetate and dissolved in 60mL of ethylene glycol, slowly added the ethylene glycol solution containing cobalt and iron into the ethylene glycol solution of anhydrous sodium acetate, and Stir for about half an hour under stirring, mix evenly, and then add polyacrylic acid (M w 1820) 0.43g was added to the above mixed solution, and the stirring was continued for 2h to obtain a uniform yellow precursor solution.

[0065] (2) Heating reaction...

Embodiment 3

[0080] Example 3 A preparation method of highly saturated magnetized superparamagnetic ferrite porous microspheres

[0081] A High Saturation Magnetization Superparamagnetic Porous ZnFe 2 o 4 The preparation of microspheres, the preparation process comprises the following steps:

[0082] 1. Superparamagnetic ZnFe 2 o 4 Synthesis of microspheres

[0083] (1) Preparation of precursor solution

[0084] At room temperature, 6 mmol ZnCl 2 , 12mmolFeCl 3 ·6H 2 O is dissolved in 70mL ethylene glycol, weighs 180mmol anhydrous sodium acetate and dissolves it in 70mL ethylene glycol, slowly adds the ethylene glycol solution containing cobalt and iron into the ethylene glycol solution of anhydrous sodium acetate, and Stir for about half an hour under stirring, mix evenly, and then add polyacrylic acid (M w 1850) 0.47 g was added to the above mixed solution, and the stirring was continued for 3 h to obtain a uniform yellow precursor solution.

[0085] (2) Heating reaction

[00...

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Abstract

The invention provides a preparation method of high-saturation magnetization superparamagnetic ferrite porous microspheres. The preparation method specifically comprises the following steps: synthesizing superparamagnetic ferrite microspheres and synthesizing superparamagnetic ferrite porous microspheres: synthesizing ferrite microspheres with good dispersity in one step by adopting a solvothermalmethod, and then etching monodisperse ferrite microspheres into a porous structure by adopting an etching method, so as to increase the specific surface area of the monodisperse ferrite microspheres.The superparamagnetic ferrite particles obtained by adopting the method maintain superparamagnetism, have high saturation magnetization and high adsorption capacity, and can be applied to the biological fields of drug delivery, targeted drug delivery, biological separation and the like. The method also has the advantages that the raw materials are green and non-toxic, each step of the method is simple and convenient to operate and pollution-free, and feasibility is provided for later industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic ferrite materials, and in particular relates to a preparation method of highly saturated magnetized superparamagnetic ferrite porous microspheres. Background technique [0002] When the particle size of magnetic nanoparticles is refined to a certain critical scale, each nanoparticle is equivalent to a single magnetic domain structure. If the size continues to decrease until its magnetic anisotropy is equivalent to the energy of thermal motion, the magnetic dipole will move irregularly, and the magnetization direction will not be fixed in one direction, so this small particle will not When the external magnetic field does not show permanent magnetic moment, this phenomenon is called superparamagnetism. For superparamagnetic particles, the magnetization curve does not show hysteresis, which can prevent particles from aggregating in solution due to magnetic interactions...

Claims

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Application Information

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IPC IPC(8): C01G49/00C01G49/08C01G51/00H01F1/00H01F41/02
CPCC01G49/0072C01G49/0063C01G49/08C01G51/00H01F1/0018H01F41/02C01P2006/12C01P2006/16C01P2006/42
Inventor 苑红磊许留洋贾焕霞朱晓垒
Owner ZHOUKOU NORMAL UNIV
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