Preparation method of SiO2-coated Fe3O4 core-shell magnetic nanoparticles

Abstract

The invention provides a method for preparing silicon dioxide-coated ferric oxide core-shell magnetic nanoparticles, which comprises the following steps: dissolving a surfactant in an organic solvent to form a uniform water-in-oil microemulsion; Add ferrous chloride tetrahydrate aqueous solution dropwise to the water-in-oil microemulsion, mix evenly, and then add alkaline reagent to the resulting mixed solution to obtain a uniformly dispersed ferric oxide nanoparticle microemulsion; The silicon source is added dropwise into the microemulsion, mixed evenly, and then an alkaline reagent is added to the obtained mixed solution to hydrolyze the silicon source to generate silicon dioxide, and the silicon dioxide is coated with iron ferric oxide nanoparticles. The preparation method is simple and efficient, and can avoid the multi-core-shell structure easily caused by traditional methods, so that small-sized particles also maintain a core-shell structure, and the silica-coated trioxide obtained in the present invention The magnetic nanoparticles with iron core-shell structure have uniform size, good dispersion, and are not easy to agglomerate.

Description

technical field [0001] The invention relates to a preparation method of silicon dioxide-coated iron ferric oxide core-shell structure magnetic nanoparticles, which belongs to the technical field of composite materials. Background technique [0002] Silica-coated Fe3O4 core-shell magnetic nanoparticles are of great significance in the application of nuclear magnetic imaging, drug therapy, fluorescence and surface-enhanced Raman. At present, many researchers in this field are devoting themselves to developing different synthetic methods to prepare silica-coated ferric oxide core-shell magnetic nanoparticles with uniform size, easy dispersion and stability. However, most of the silicon dioxide-coated ferric oxide core-shell magnetic nanoparticles synthesized by the current method are not uniform in size, or easy to agglomerate, or the synthesis method involved is cumbersome and complicated. [0003] Therefore, it has become an urgent technical problem to be solved in this fiel...

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Problems solved by technology

However, most of the silicon dioxide-coated ferric oxide core-shell magnetic nanoparticles synthesized by the current method are not uniform in size, or are easy to agglomerate, or the synthesis methods involved are cumbersome and complicated.

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