Method for synthesizing monodisperse SiO<2> micrometer-size particles through one-step method

Abstract

The invention provides a method for synthesizing monodisperse SiO<2> micrometer-size particles through a one-step method and belongs to the technical field of micron material preparation. The method includes the specific steps that ammonium hydroxide serves as a catalyst, CTAB serves as electrolyte, tetraethyl orthosilicate is catalyzed and hydrolyzed under an alcohol/water system, and the monodisperse SiO<2> micrometer-size particles are obtained. The method is simple in operation and little in TEOS consumption, only the functions of electrolyte and particles are achieved in the alcohol/water system, the preparation condition is mild, the obtained SiO<2> particles are good in monodispersity, and the size can reach 2 micron.

Description

technical field [0001] The invention belongs to the technical field of preparation of micron materials, and specifically relates to a process in an alcohol and water system, using ammonia as a catalyst, TEOS as a silicon source, cetyltrimethylammonium bromide (CTAB) as an electrolyte and particle stabilization agent to prepare micron-sized SiO with good monodispersity 2 particle method. technical background [0002] monodisperse SiO 2 Microparticles have a wide range of application values ​​that are completely different from nanoparticles in many fields, such as high-performance ceramic technology, heterogeneous catalysis, chromatography packed columns, polishing and other fields. Among them, the uniformity and micron size of the particles are SiO 2 The key to the application of particles in these fields. The traditional sol-gel method (such as method), generally in alcohol and water solvents, using ammonia as a catalyst, hydrolyzing and condensing tetraethyl orthosili...

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Problems solved by technology

Although the SiO prepared by this method 2 The maximum size of the particles can reach 6.6 μm, but the monodispersity of the size is difficult to control, and the particles are easy to gel. In addition, they use the method of multiple injections of silicon sources, which is troublesome to operate and requires a large amount of TEOS; another example is the Delville group, Using the seed growth method, continuously drop TEOS diluted with alcohol, by controlling the seed size and dropping speed, the secondary nucleation can be well suppressed, the monodispersity of the particles can be improved, and finally 2 μm SiO with good monodispersity can be synthesized. 2 particles, but this method also has problems such as troublesome operation, time-consuming, and large amount of TEOS; in addition, some research groups, such as the Ren group, used Synechocystis cells as templates to prepare SiO with good protein separation effect. 2 Micron particles, the size and shape of the particles are similar to the cell templates, but in the synthesis process of this method, the cells need to be pretreated, and the operation is troublesome. The hydrolysis and condensation of TEOS on the cell templates are also difficult to control. The final particle size and Topography is often poor due to the diversity of cell templates

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