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
CN101499348AInactive Publication Date: 2009-08-05TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TONGJI UNIV
Publication Date
2009-08-05
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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