Hollow structured magnetic microsphere coated with mono-dispersed silicon dioxide and its preparation method

A technology of silica and magnetic microspheres, which is applied in the field of magnetic nanomaterials, can solve the problems of poor controllability and uniformity of the particle size of magnetic nanoparticles, no surface modification of the particles, no template removal, etc., and the preparation method is simple and easy Row, uniform number of nuclei, strong acid resistance
CN1911495AInactive Publication Date: 2007-02-14JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JILIN UNIV
Publication Date
2007-02-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention is monodisperse silica coated hollow magnetic microsphere and its preparation process and belongs to the field of nanometer magnetic material technology. Superparamagnetic nanometer ferrite particle is first prepared in coprecipitatin method and monodisperse polymer microsphere with surface functional radical is synthesized in emulsion polymerization; the superparamagnetic nanometer ferrite particle and the monodisperse polymer microsphere is then compounded by means of coordination effect, and the compound is coated with silica; and the composition particle is finally calcined at 500-700 deg.c for 5-12 hr to produce the silica coated hollow magnetic microsphere. The present invention has simple preparation process and controllability of the granularity and cavity size of the magnetic microsphere, and the magnetic microsphere has high chemical and colloid stability and may be used in biological detection and other fields.
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Description

technical field

[0001] The invention belongs to the technical field of magnetic nanometer materials, in particular to a superparamagnetic microsphere with a hollow structure coated with monodisperse silicon dioxide and a preparation method thereof. Background technique

[0002] Due to its unique properties (no remanence), superparamagnetic nanoparticles have broad application prospects in biomedical fields such as bioseparation, immunoassay, and targeted drugs. However, due to its own chemical stability, colloidal stability, and poor biocompatibility, its surface often needs to be modified with a protective layer, such as polymer or silicon dioxide. Due to the advantages of good chemical and colloidal stability and good biocompatibility, silica is one of the most ideal materials for protecting magnetic particles. The inventor has used ferrite nanoparticles without any surface treatment and ultrasonic treatment for silica coating to obtain ferrite-silica core-shell particles...

Claims

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