Microsphere with multiple magnetic nano cores@gaps@porous shell structures and preparation method thereof

Abstract

The invention relates to a microsphere with multiple magnetic nano cores@gaps@porous shell structures and a preparation method thereof. The microsphere structure is characterized in that a porous hollow shell contains a plurality of magnetic nano cores. In the preparation method, iron (III) is taken as the single iron precursor, the spherical cell wall of unicellular algae is taken as the precursor of porous microsphere wall, the substances in the algae cells are used to replace chemical reagents to carry out reactions, and a hydrothermal method with mild conditions is performed to prepare the microsphere with multiple magnetic nano cores@gaps@porous shell structures. The preparation method is simple; a microsphere, which has a complicated structure composed of a porous hollow shell and a plurality of magnetic cores, can be produced without a template; the preparation process is green and environment-friendly; no organic reagent is added, and the obtained microsphere has the advantages of excellent magnet-response performance and large loading space.

Description

technical field [0001] The invention relates to a microsphere with a multi-magnetic nano core void porous shell structure and a preparation method thereof. Background technique [0002] Magnetic microspheres with a bell structure or egg yolk shell structure, due to their unique magnetic core-gap shell structure, exhibit excellent magnetic response capability, large internal space for loading functional guest substances, and the permeability and environment of the sphere wall. Response characteristics have been widely concerned and applied in the fields of material separation and purification, targeted drug delivery, nuclear magnetic imaging, and catalysis. Most of the microspheres prepared at present are microspheres with a single magnetic core inside, and the multi-core structure can greatly increase the active sites and contact area of ​​the core compared with a single core, thereby improving the performance of the microspheres. The preparation process of quasi-multimagne...

AI Technical Summary

Problems solved by technology

Most of the microspheres prepared at present are microspheres with a single magnetic core inside, and the multi-core structure can greatly increase the active sites and contact area of ​​the core compared with a single core, thereby improving the performance of the microspheres. The preparation process of quasi-multimagnetic core microspheres is extremely complicated, and there is no relevant report so far

Moreover, most of the existing methods for preparing microspheres with a single magnetic core structure use many organic chemical substances such as crosslinking agents, emulsifiers, stabilizers, redox agents, etc., and the preparation steps are very cumbersome and time-consuming. Some methods also require high-temperature calcination, inert gas Protection and other measures

The use of a large number of harmful chemicals is not only contrary to the basic principles of green chemistry, but also complicated preparation methods and harsh preparation conditions limit its large-scale production and application. Therefore, it is necessary to develop a green and simple preparation method Microspheres with multi-magnetic nano core void porous shell structure and preparation method thereof

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