Method for preparing magnetic spinel ferrite hollow ball in one-step method

A spinel ferrite, hollow sphere technology, applied in the fields of inorganic material magnetism, nanostructure manufacturing, nanotechnology, etc., can solve problems such as affecting production efficiency, cumbersome steps, consumption of production raw materials, etc., and achieves uniform size distribution and operation. Simple, high saturation magnetization and coercivity effect

Inactive Publication Date: 2010-04-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The above documents and patents provide some preparation methods of this kind of hollow ferrite nanospheres. However, it can be seen that most of the preparation methods revolve around the template method. The general steps are to synthesize a spherical template first. Then react on the surface of the template, so that the reaction product or precursor is deposited or accumulated on the surface, and finally heat treatment to remove the template, the steps are cumbersome, and the template is used as a "sacrificial core" from generation to removal, which will inevitably affect pro...

Method used

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  • Method for preparing magnetic spinel ferrite hollow ball in one-step method
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  • Method for preparing magnetic spinel ferrite hollow ball in one-step method

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Embodiment 1

[0026] Weigh 20mmol of ferric chloride and 10mmol of cobalt dichloride and mix them into 100ml of ethylene glycol, then add 8g of urea and 0.1g of polyvinylpyrrolidone, stir to form a brown transparent mixed solution; The solution is placed in a high-pressure stainless steel reaction kettle lined with polytetrafluoroethylene, the filling degree is 80%, the sealing bolt is tightened, and the reaction is carried out at 180°C for 20 hours. The product is separated by washing with deionized water and absolute ethanol with a magnet. Dry at 60°C for 4 hours to obtain magnetic CoFe 2 o 4 hollow ball.

[0027] The purity of the obtained sample is very high, and its XRD diffraction peak is the same as that of standard CoFe 2 o 4 The spectrum (JCPDS 22-1086) corresponds completely, without any impurity peaks. The size of the hollow sphere is about 350nm, the wall thickness of the hollow sphere is about 80nm, the typical saturation magnetization of the product is 75emu / g, the residua...

Embodiment 2

[0029] Experimental method is the same as embodiment 1, just changes cobalt dichloride into nickel sulfate, promptly obtains magnetic NiFe 2 o 4 Hollow sphere, the average particle size is about 300nm.

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Abstract

The invention relates to a method for preparing magnetic spinel ferrite hollow ball in one-step method, which belongs to the technical field of magnetic nano material preparation technology. The preparation method comprises the following steps: utilizing polyatomic alcohol as dissolvent, dissolving tervalence malysite and other divalent inorganic metal salt into polyatomic alcohol, adding right amount of weak base and surface activator, evenly stirring to form brown and transparent mixed solution, placing the solution into a high-pressure stainless steel autoclave which utilizes polytetrafluoroethylene as inside lining, filling volume is 50%-80%, and the solution is sealed in the high-pressure stainless steel autoclave, products are separated by magnets when the solution is reacted 12-24 hours under 160-250 DEG C, the products are washed by water and alcohol, and are dried, thereby getting magnetic spinel ferrite MFe2O4 (M=Co, Ni, Mn, Zn) hollow balls. The method has simple operation, can self-assemble to form a hollow ball structure without templates, does not need subsequent treatment (removal of templates), and is suitable for industrial production of bigger yield, and the products which are got have single material phase and stable property.

Description

technical field [0001] The invention relates to a method for preparing nano spinel ferrite hollow spheres, and belongs to the technical field of magnetic nano material preparation technology. Background technique [0002] As an important class of magnetic materials, spinel nano-ferrite has always been concerned by researchers because of its high saturation magnetization, coercive force and magnetocrystalline anisotropy, and it is widely used in various fields. For example, magnetic fluid technology, magnetic recording storage materials, medical targeting materials and sensor devices, etc. Among them, its nano-preparation technology and shape control technology have become research hotspots. Because the physical and chemical properties of nano-ferrite materials, especially the magnetic properties, are significantly affected by their particle size and morphology, cobalt ferrites with various shapes and controllable shapes have become one of the current research hotspots, amon...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622B82B3/00H01F1/34
Inventor 乔小晶郑秋雨暴丽霞张同来张旭杨利张强张建国
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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