Method for producing magnetic hollow silicon dioxide particle

A technology of hollow silica and silica, applied in the direction of microsphere preparation, microcapsule preparation, etc., can solve the problem of affecting the stability of the emulsion, the size of the dispersed phase, the type of emulsion, the magnetic properties of the product that affects the stability of the emulsion, and it is not suitable for magnetic hollow Particles and other problems, it is not easy to achieve magnetic properties, low cost, and avoid changes in magnetic properties
CN101195085AInactive Publication Date: 2008-06-11BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Publication Date
2008-06-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a process for preparing magnetic hollow silicon dioxide particles, wherein alkaline water solution is filled into the mixed solution of divalent ferric salt and trivalent ferric salt, suspending liquid which is generated by the reaction with magnetic ferrite nanometer particles and electrolytic solution is filled with oil dissolvent, the volume ratio of the oil dissolvent and the electrolytic solution is 0.05-50, and stable emulsion of ferrite particles is scattered and mixed and is prepared. Silicon source or silicon dioxide water collosol is directly filled into the emulsion which is prepared, which reacts under the normal temperature, and the PH value is regulated to 3.9, silicon dioxide precursors generates controllable chemical reaction in the system to prepare magnetic hollow silicon dioxide particles. The invention synthesizes magnetic hollow silicon dioxide particles by one step, which avoids changes of agglomeration and magnetic performance of nanometer magnetic particles, the invention utilizes the electrolytic solution which is generated during the process of preparing the magnetic ferrite, and leads the particles to reach hydrophilic-lipophilic balance at oil-water interface, and has the advantages of simple artistic process, low cost and low reacting temperature, and avoids affect to the magnetic performance of the particles.
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Description

technical field

[0001] The invention relates to a method for preparing magnetic hollow silicon dioxide particles, in particular to a method for preparing magnetic hollow silicon dioxide particles by using an emulsion stabilized by magnetic nanoparticles as a template (Pickering emulsion method). Background technique

[0002] Magnetic hollow silica particles are a recognized adsorbent and adsorbent carrier, not only has the characteristics of light weight, high specific surface area and strong adsorption capacity, but also can be easily separated from the suspension under an external magnetic field, and removed When exposed to an external magnetic field, these particles do not show any remanence, and can be widely used in high-tech fields such as cell separation, magnetic enzyme immunoassay, drug controlled release carrier and hydrogen storage materials, so they are highly valued by researchers. The most commonly used method for preparing magnetic hollow microspheres is templ...

Claims

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