Preparation method of spinel ferrite hollow sphere with core-shell structure

A technology of shell structure and spinel, which is applied in the field of preparation of spinel ferrite hollow spheres, can solve the problems of difficult surface modification, difficulty of hollow spheres, layer-by-layer coating, etc., and achieves convenient operation and simple preparation process , The effect of low raw material cost

Active Publication Date: 2010-07-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

However, it is more difficult to prepare hollow spheres with spinel ferrite core-shell structure by this method.
This is because the core of ferrite is not like silicon oxide because it has silicon-oxygen bonds that are easy to combine with surfactants, so it is difficult to modify the surface, so it cannot be covered layer by layer

Method used

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  • Preparation method of spinel ferrite hollow sphere with core-shell structure
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  • Preparation method of spinel ferrite hollow sphere with core-shell structure

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preparation example Construction

[0016] In a specific embodiment of the present invention, the preparation method of the spinel ferrite hollow sphere of the core-shell structure of the present invention comprises:

[0017] 1) Preparation of carbon spheres: according to the concentration of 2.5-10.3 grams of sucrose / 10ml of water, dissolve sucrose in water, then conduct hydrothermal treatment in an autoclave at 180°C-210°C for 70-150 minutes; filter out the solid product after natural cooling - carbon spheres, washed with deionized water, and then dispersed in deionized water to form a suspension of carbon spheres-water, wherein the weight ratio of carbon spheres / water is 1 / 100-1 / 10;

[0018] 2) Impregnation: Sonicate the carbon spheres obtained in step 1) in a mixed salt solution of divalent metal salt (M) and ferric salt (F) for 10-30 minutes, then soak for 4-20 hours under stirring, and filter Post-washing, drying at 100°C for 12 hours to obtain a powdery material;

[0019] Described divalent metal salt is...

Embodiment 1

[0026] Firstly, the carbon sphere template was prepared with sucrose by hydrothermal method: 5.134 grams of sucrose was dissolved in 10ml of water to form a uniform transparent solution. After washing with ion water for 3 times and drying at 100°C, carbon spheres with a diameter of 3.2 μm can be obtained. Then about 0.4 g of the obtained carbon spheres was put into 10 ml of deionized water, and ultrasonicated for 5 minutes to obtain a carbon sphere-water suspension.

[0027] Impregnation: 5.95 g of Zn(NO 3 ) 2 ·6H 2 O and 16.16 g Fe(NO 3 ) 3 9H 2 O is dissolved in 10ml of water (that is, the concentration of zinc nitrate is 1.07M, the concentration of ferric nitrate is 2.14M, and the molar ratio of the two is 1:2) to form a uniform salt solution; the carbon sphere-water suspension and the metal salt The solution was stirred and mixed for 3-5 minutes, then sonicated for 15 minutes, and then stirred for an additional 5 hours. The suspension was filtered and washed, and th...

Embodiment 2

[0032] Firstly, the carbon sphere template was prepared with sucrose by hydrothermal method: 5.134 grams of sucrose was dissolved in 10ml of water to form a uniform transparent solution. After washing with ion water for 3 times and drying at 100°C, carbon spheres with a diameter of 3.2 μm can be obtained. Then about 0.4 g of the obtained carbon spheres was put into 10 ml of deionized water, and ultrasonicated for 5 minutes to obtain a carbon sphere-water suspension.

[0033] Impregnation: 8.94 g of Zn(NO 3 ) 2 ·6H 2 O and 24.24 g Fe(NO 3 ) 3 9H 2 O is dissolved in 10ml of water (that is, the concentration of zinc nitrate is 1.3M, the concentration of ferric nitrate is 2.6M, and the molar ratio of the two is 1:2) to form a uniform salt solution; carbon sphere-water suspension and metal salt solution Stir to mix for 3-5 minutes, then sonicate for 15 minutes, then continue stirring for 5 hours. The suspension was filtered and washed, and then dried at 100° C. for 12 hours,...

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Abstract

The invention relates to a preparation method of a spinel ferrite hollow sphere with a core-shell structure. Carbon spheres are used as templates. The method comprises the following steps of: firstly, using a hydrothermal method to manufacture the carbon sphere templates at 80-210 DEG C; then, dispersing the carbon spheres in a high-concentration metal salt solution to absorb metal ions; and finally, carrying out thermal treatment on the metal ions with carbon spheres in the air so as to remove the carbon spheres to obtain the spinel ferrite hollow sphere with the core-shell structure. Because the method omits the steps of layer-by-layer coating and multi-time modification, the method has short technical process and convenient operation.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a method for preparing spinel ferrite hollow spheres with a core-shell structure. Background technique [0002] Spinel ferrite, generally refers to MFe 2 o 4 (M=Zn, Ni, Co, Cd, etc.), is an important magnetic material, and has important applications in electronic devices, information storage, magnetic response imaging, drug delivery, etc. Nano- or micron-scale ferrite hollow spheres have unique physical and chemical properties due to their low density, large specific surface area, hollow structure, and shells composed of nanoparticles, so hollow spheres with this core-shell structure are widely used. It is used in applications related to surface properties, such as catalysts in many reaction processes, absorbents for eliminating toxic gases, and sensor materials in gas-sensitive systems. In addition, it is also used in photonic crystals, diagnostics, and pharmacolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 王丹李振民赖小勇毛丹
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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