Large-scale preparation of morphology-controlled microporous silica particles via gradual injection of reactants with different surfactants

Abstract

Microporous silica particles that are monodispersed and have submicrometer diameters are attracting much attention in many applications, including medicine, environmental technology, cosmetics, and electronics. However, the production of microporous silica particles on an industrial scale comes with some difficulties. We have recently reported that the efficient synthesis of monodisperse and microporous silica particles can be achieved by the gradual injection of reactants into the reaction system. In the present study, we examined the effect of template molecules on the particle morphology via the gradual injection of reactants method. The use of the primary amines is mandatory to obtain the microporous silica particles. Furthermore, the solubility of amines in the reaction solution plays a critical role in the synthesis of monodispersed and microporous silica particles of 100 nm in diameter. Monodisperse silica particles 100 nm in diameter and with a specific surface area of 500 m2/g could be obtained with decylamine as a surfactant. The results indicate that the present synthetic approach is useful for efficient and large-scale production of monodisperse and microporous silica particles with the designated surface area. Microporous silica particles of 100 nm in diameter can be prepared in an industrial scale by the gradual injection of reagent approach. Good dispersibility of particle diameter and effective production can be achieved at the same time.