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Spinel type ferrite magnetic hollow microsphere and preparation thereof

A technology of spinel ferrite and microspheres is applied in the field of intercalation structure magnetic materials, which can solve the problems of less involvement of hollow magnetic materials and the like.

Inactive Publication Date: 2008-10-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the literature Chem.Commun., 2006, 3125-3127, Takayoshi Sasaki. et al studied the use of sulfonated polystyrene as a template to peel off layered double hydroxyl composite metal oxides (LDHs) in sulfonated polystyrene The surface of ethylene microspheres self-assembles layer by layer and rebuilds the structure of LDHs. By removing sulfonated polystyrene, hollow nanospheres with sheet-like hydrotalcite as the building unit are obtained. However, this method is rarely involved in the preparation of hollow magnetic materials.

Method used

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  • Spinel type ferrite magnetic hollow microsphere and preparation thereof
  • Spinel type ferrite magnetic hollow microsphere and preparation thereof
  • Spinel type ferrite magnetic hollow microsphere and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A: Weigh 1.441g Co(NO 3 ) 2 ·6H 2 O, 0.688g FeSO 4 ·7H 2 O and 0.989g Fe 2 (SO 4 ) 3 ·xH 2 O dissolved in deionized water to make 100mL mixed salt solution, put the solution into a four-neck flask, blow nitrogen gas and stir to dissolve the salt; then weigh 6g NaOH and dissolve it in deionized water to make 100mL mixed alkali solution; weigh The moisture content is 4.0 g of sulfonated polystyrene dissolved in deionized water to make a 50 ml suspension.

[0041] B: Pour the sulfonated polystyrene suspension prepared in step A into the salt solution, and stir to make it evenly mixed;

[0042] C: Titrate the alkali solution prepared in step A to the mixed solution in step B, so that the pH of the solution is 7.0, and then crystallize at room temperature for 4 hours;

[0043] D: Put the colloidal slurry in step C into ice water at 0°C to cool, then wash three times with ice water passed through nitrogen, and finally wash twice with ethanol at 0°C, seal with ice eth...

Embodiment 2

[0046] A: Weigh 0.721.g Co(NO 3 ) 2 ·6H 2 O, 0.344g FeSO 4 ·7H 2 O and 0.495g Fe 2 (SO 4 ) 3 ·xH 2 O was dissolved in deionized water to make 100mL mixed salt solution, put the solution into a four-neck flask, blow nitrogen gas and stir to dissolve the salt; then weigh 4g NaOH and dissolve it in deionized water to make 100mL mixed alkali solution; weigh The moisture content is 7.0 g of sulfonated polystyrene dissolved in deionized water to make a 50 ml suspension.

[0047] B: Pour the sulfonated polystyrene suspension prepared in step A into the salt solution, and stir to make it evenly mixed;

[0048] C: Titrate the alkali solution prepared in step A to the mixed solution in step B to make the pH of the solution 7.0, and then crystallize in a 40°C water bath for 0.5h;

[0049] D: Put the colloidal slurry in step C into ice water at 0°C to cool, and then wash the three-stone ferrite with ice water passed through nitrogen.

[0050] Hitachi-S4700N SEM was used to analy...

Embodiment 3

[0059] A: Weigh 0.721.g Co(NO 3 ) 2 ·6H 2 O, 0.344g FeSO 4 ·7H 2 O and 0.495g Fe 2 (SO4 ) 3 ·xH 2 O was dissolved in deionized water to make 100mL mixed salt solution, put the solution into a four-neck flask, blow nitrogen gas and stir to dissolve the salt; then weigh 4g NaOH and dissolve it in deionized water to make 100mL mixed alkali solution; weigh The moisture content is 7.0 g of sulfonated polystyrene dissolved in deionized water to make a 50 ml suspension.

[0060] B: Pour the sulfonated polystyrene suspension prepared in step A into the salt solution, and stir to make it evenly mixed;

[0061] C: Titrate the alkaline solution prepared in step A to the mixed solution in step B to make the pH of the solution 7.0, and then crystallize in a water bath at 40°C for 1.5h;

[0062] D: Put the colloidal slurry in step C into ice water at 0°C to cool, then wash three times with ice water passed through nitrogen, and finally wash twice with ethanol at 0°C, seal with ice e...

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Abstract

The invention relates to a magnetic hollow microsphere of spinel ferrite and a preparation method thereof and pertains to the technical field of magnetic materials with intercalation structure. The general chemical formula of the magnetic hollow microsphere of spinel ferrite is M<2+>Fe<3+>2O4. The method comprises the following steps: firstly, on the surface of sulfonated polystyrene microspheres, metal-salt ions with different charges are absorbed; then, by adopting coprecipitation, hydrotalcite generates in situ on the surface of the sulfonated polystyrene microspheres; and then, by means of a program of increasing temperature and roasting, the magnetic hollow microspheres of spinel ferrite can be obtained. The process can adjust and control the generation of the hydrotalcite on the surface of the sulfonated polystyrene microspheres by regulating synthetic conditions and crystallization temperature, and regulate magnetic property of the spinel ferrite by adjusting and regulating the composition of LDHs laminates. The magnetic hollow microsphere of spinel ferrite of the invention has special technique conditions, simple operation and mild synthetic conditions, and owing to the unique structure and properties, the hollow microsphere can be widely applied in such respects as drug carriers, nanoreactors, filtration, separation, magnetic filling materials and magnetic photon crystals, etc.

Description

technical field [0001] The invention belongs to the technical field of intercalation structure magnetic materials, and in particular relates to a spinel ferrite magnetic hollow microsphere and a preparation method thereof. Firstly, a double hydroxyl compound metal is grown in situ on the surface of sulfonated polystyrene by a co-precipitation method The oxide is then calcined to prepare spinel magnetic hollow microspheres. Background technique [0002] Magnetic materials can be divided into two categories: metallic magnetic materials and non-metallic materials. The preparation process of metal magnetic materials is complicated, the cost is high, and the resistivity is small; while ferrite is a kind of non-metallic magnetic material, which has good performance, low cost, simple process, and can save a lot of precious metals. Its resistivity is not only higher than that of metal The magnetic material is much larger, and it also has higher power-saving performance. [0003] T...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 徐赛龙杨迎生段雪谢亚茹张法智
Owner BEIJING UNIV OF CHEM TECH
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