Hollow silicon dioxide/magnetic composite microsphere and its production method

A technology of magnetic composite microspheres and silica, which is applied in the field of composite materials and functional materials, can solve the problems of uncoated magnetic particles, etc., and achieve the effects of good mechanical and chemical stability, excellent magnetic properties, and controllable particle size

Inactive Publication Date: 2009-08-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are also a few reports on the use of sulfonic acid cation exchange resin microspheres as templates to embed magnetic particles inside the microspheres by the in-situ method, so far there is no report on the surface encapsulation of hollow silica microspheres with sulfonic acid groups. A report on magnetically coated particles

Method used

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  • Hollow silicon dioxide/magnetic composite microsphere and its production method
  • Hollow silicon dioxide/magnetic composite microsphere and its production method
  • Hollow silicon dioxide/magnetic composite microsphere and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The ratio of raw materials used is as follows:

[0038] Component Weight percent (wt.%)

[0039]Hollow silica microspheres with sulfonic acid groups 100 parts

[0040] Water 40000 parts

[0041] Dispersant ethylene glycol 1000 parts

[0042] Oxidant H 2 o 2 40 copies

[0043] Ferric chloride hexahydrate 0 parts

[0044] 80 parts of ferrous sulfate heptahydrate

[0045] Hexamethylenetetramine 700 parts

[0046] Preparation of magnetic composite particles:

[0047] According to the above component ratios, the hollow silica microspheres with sulfonic acid groups are ultrasonically dispersed in the dispersion medium added with dispersant and oxidant to obtain sample a.

[0048] Add ferrous sulfate heptahydrate into a solution into the reaction vessel, add sample a, and stir for 0.5-1 hour; dissolve hexamethylenetetramine in deionized water to form a solution, slowly add it into the reaction vessel, and then Under the protection ...

Embodiment 2

[0050] The ratio of raw materials used is as follows:

[0051] Component Weight percent (wt.%)

[0052] Hollow silica microspheres with sulfonic acid groups 100 parts

[0053] Water 40000 parts

[0054] Dispersant polyethylene glycol 1000 parts

[0055] Oxidant Potassium Perchlorate 10 parts

[0056] Ferric chloride hexahydrate 110 parts

[0057] 60 parts of ferrous sulfate heptahydrate

[0058] Hexamethylenetetramine 700 parts

[0059] Preparation of magnetic composite particles:

[0060] According to the proportion of the above components, the hollow silica microspheres with sulfonic acid groups were ultrasonically dispersed in the dispersion medium added with dispersant and oxidant to obtain sample a.

[0061] Add ferric chloride hexahydrate and ferrous sulfate heptahydrate into a solution into a reaction vessel, add sample a, and stir for 0.5-1 hour; dissolve hexamethylenetetramine in deionized water to form a solution, and slowly add to After being placed in the r...

Embodiment 3

[0063] The ratio of raw materials used is as follows:

[0064] Component Weight percent (wt.%)

[0065] Hollow silica microspheres with sulfonic acid groups 100 parts

[0066] Water 40000 parts

[0067] Dispersant sodium dodecylbenzene sulfonate 1000 parts

[0068] Oxidant ammonium persulfate 50 parts

[0069] Ferric chloride hexahydrate 0 parts

[0070] Nickel sulfate 90 parts

[0071] Aniline 700 parts

[0072] Preparation of magnetic composite particles:

[0073] According to the proportion of the above components, the hollow silica microspheres with sulfonic acid groups were ultrasonically dispersed in the dispersion medium added with dispersant and oxidant to obtain sample a.

[0074] Make a solution of nickel sulfate into the reaction container, add sample a, and stir for 0.5-1 hour; dissolve aniline in deionized water to make a solution, slowly add it into the reaction container, and then raise the temperature to 90°C under the protection of nitrogen atmosphere. ...

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Abstract

The invention belongs to the technical field of a composite material and a functional material, particularly relates to a hollow silica / magnetic composite microsphere and a preparation method thereof. The magnetic composite microsphere is formed by embedding a layer of magnetic particles on the surface of the hollow silica microsphere with sulfonic acid groups. The composing raw materials are hollow silica microspheres with sulfonic acid groups, trivalent iron salts, divalent transition metal salts, oxidizing agents, dispersing agents, and alkali, according to a suitable weight ratio, and by steps such as ultrasonic dispersion, particle embedding, post processing and the like, the composite microsphere is prepared. The prepared hollow silica / magnetic composite microsphere has small density, good mechanical and chemical stability, controllable particle size, and excellent magnetic property which can be used for obtaining ferrimagnetism or for superparamagnetism by adjusting the ratio of the trivalent iron salts and the divalent transition metal salts.

Description

technical field [0001] The invention belongs to the technical field of composite materials and functional materials, and in particular relates to a hollow silica / magnetic composite microsphere and a preparation method thereof. Background technique [0002] Nanomagnetic hollow microspheres have broad application prospects in the fields of catalysts, targeted drug delivery, storage media, electromagnetic wave absorption, and bioseparation due to their large specific surface area, low density, good dispersion, and superparamagnetic properties. [0003] The preparation method of nano magnetic hollow microspheres is mainly the template method. The cladding layer is formed by layer-by-layer self-assembly, deposition control on the template surface, and reaction with some functional groups (such as carboxyl, amino and sulfonic acid groups) on the template surface. The template used can be inorganic nanospheres, such as CaCO 3 , SiO 2 , carbon microspheres, etc., or organic polym...

Claims

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Application Information

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IPC IPC(8): H01F1/10C01B33/113C08G77/22B22F1/02
Inventor 袁俊杰张雄浦鸿汀杨正龙
Owner TONGJI UNIV
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