EFFECT OF SYNTHESIS TIME ON THE MORPHOLOGY OF MONODISPERSE SILICA MICROSPHERES
DOI:
https://doi.org/10.15421/jchemtech.v32i4.315165Keywords:
silica, sol-gel, porous structure, mesopores, dendritic nanoparticles, synthesisAbstract
Silica (SiO2) microspheres can be used in pharmaceutical, cosmetic, food, coating and other technological applications. Consequently, the task is to search for optimal parameters for easy synthesis of monodisperse silica microspheres with controlled structural and physicochemical characteristics. The aim was to study the effect of synthesis time on the formation of silica microspheres for control of their surface morphological properties. The synthesis was conducted by alkaline hydrolysis in an aqueous/alcohol solution using structure-directing agents, namely cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal), in conjunction with an inorganic precursor, namely tetraethoxysilane (TEOS). The synthesis time varied from 1.5 to 5 hours. The following methods were used to study the synthesised silica microspheres: X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and low-temperature N2 adsorption/desorption method. As a result were synthesized silica spheres with a consistent diameter of approximately 200 nm and mesoporous structure, regardless of synthesis duration. However, the thickness of the nanosheets forming the sphere structure increased from 7 nm to 22 nm as the synthesis time extended. The sample synthesised for 1.5 hours showed the highest specific surface area, reaching 504 m²/g.
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