Synthesis of Nanosilica by Sol-gel Method
The objective of this study to synthesis of nanosilica using sol-gel method. The effect of ammonia concentration, time of reaction on size and dispersion were investigated. Tetra-alkyl silicate (TEOS) 4 mL was first dissolved in 50 mL of ethanol (ETH) under magnetic stirrer at room temperature for 10 minutes. Then, 1 mL of distilled water was dropped into the reaction media to hydrolysis of TEOS for 2 hours. After that, two different concentrations, 0.231 and 0.458 mol/L of ammonia solution, were put into the reaction mixture. The reaction was continued for 1h, 4h, 8h, 1d, 2d, 3d, 4d, 5d, 7d, 9d, and 30d. The dispersion of nanosilica was characterized for transmission electron micrograph (TEM), dynamic light scattering (DLS), zeta potential, specific surface area and fourier transform infrared spectrophotometry (FTIR). The result of this study showed that amount of ammonia 0.231 mol/L with the time of reaction at 9 days can create the homogeneous distribution of nanosilica particles with average size of 36 nm.
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