Preparation method for controllable hollow mesoporous silicon dioxide nanospheres

Abstract

The invention provides a preparation method for controllable hollow mesoporous silicon dioxide nanospheres. The method comprises the following steps of: dissolving iron salt, acetic acid and polyvinylpyrrolidone in ethanol, and uniformly stirring and mixing, then transferring the solution into a polytetrafluoroethylene reaction kettle, and reacting while heating to obtain an iron oxide nanoparticle suspension; adding ethanol, deionized water and cetyl trimethyl ammonium bromide into the iron oxide nanoparticle suspension, adding alkali to adjust the pH value to be 7-12, slowly adding tetraethoxysilane in a stirring condition so as to for 12-72 hours, filtering, drying, and roasting at 400-600 DEG C, thus obtaining a mesoporous silicon dioxide-coated iron oxide nanomaterial with a core-shell structure; and completely soaking the obtained mesoporous silicon dioxide-coated iron oxide nanomaterial with the core-shell structure in a prepared acidic etching solution, dissolving an iron oxide used as a hard template, and washing with the deionized water and the ethanol, filtering and drying, thus obtaining the hollow mesoporous silicon dioxide nanospheres. The preparation method for the controllable hollow mesoporous silicon dioxide nanospheres disclosed by the invention has the advantages of being simple in synthesis process, moderate in operation condition, cheap in raw material and easy in acquisition of raw materials, and easy in enlargement and synthesis.

Description

technical field

[0001] The invention relates to a preparation method of controllable hollow mesoporous silica nanospheres. Background technique

[0002] Hollow silica microspheres have extremely broad application prospects because of their non-toxic and side-effect-free properties, low density, and high thermal and mechanical stability. They can not only be widely used as microcapsule materials in the controllable transport and release system of drugs, dyes, cosmetics, sensitive reagents such as enzymes, proteins, etc., but also can be used as lightweight fillers, highly selective catalysts or catalyst carriers, and in Artificial cells, disease diagnosis, etc. will also have extremely important value. In addition, the design of physical and chemical properties can be effectively realized by adjusting the size of microspheres, cavities and wall thicknesses, which has broad application prospects in industry.

[0003] There are many methods to synthesize hollow nanospheres, su...

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