A NOVEL METHOD FOR HIGHLY MONODISPERSE MICRON-SIZED SILICA PARTICLES IN ROOM TEMPERATURE

Abstract

The advances of silica particles having monodisperse shape have received a lot of attention in colloidal science. Recently, the silica colloids utilize for studying such as stabilizer, chromatography, catalysis, and rheology. Especially, micron-sized monodisperse silica particles were used in many research and industrial application. However, it is difficult to satisfy both monodisperse and micron-size diameter in preparation of silica particles. Therefore, it has been widely investigated to find the more appropriate system. Also, surface modification is an important part of silica colloids and these products support to prepare hybrid materials. In our experiments, we describe the simple and easy method that is able to prepare the monodisperse silica particles with micron-size range and functionalized surface. We use 3-mercaptopropyl trimethodxysilane (MPTMS) as a reagent and particle size are 1.2㎛, 2.5㎛ and 3.7㎛. There are some keys in our method. First, size of particle can be controlled by the amount of reagent. Second, we do not need any other assistants to make silica colloids. Third, for fabricating the particles, we used one-step method using ammonia catalyst for the hydrolysis and condensation in room temperature. All samples were characterized with SEM and TEM images to confirm the morphology of the particle. We can get the properties of the particle using thermogravimetric analyzer (TGA) and energy dispersive X-ray (EDX) data.