An Innovative Preparation Methodology of Non-spherical Nanosize Silica Particle
KONG Hui1,2, LIU Weili1, SONG Zhitang1
1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050; 2 School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049
Abstract: Non-spherical nanosize silica particles were prepared by ion exchange method using low cost industrial sodium silicate as raw material. In the preparation process, the morphology of the silica particle was controlled by the shape of the silica nuclei, which was dominated by the feeding rate of inorganic alkali catalyst 1% (mass fraction) NaOH solution to the fresh active silicic acid during nuclei formation process. This method avoided the deficiency of conventional methods (by introducing organic bases or by introducing double or triple valence cations) for synthesizing non-spherical silica particles. Scanning electron microscopy (SEM) de-monstrated that the morphology of the prepared silica particles were not spherical (like peanut, dumbbell or jujube), the axial size was about 10—20 nm, the range of the radial size was about 45—80 nm. Dynamic light scattering (DLS) test revealed that the average size of Gaussian distribution of non-spherical particle was 39 nm, and the polydispersity index was as high as 0.261. This method of preparing non-spherical silica particles is simple and environment-friendly, and is very beneficial to industrial production and application.
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2018, Vol. 32 
