| 초록 |
In this work, hollow silica nanoparticles were synthesized by using inorganic template calcium carbonate. The sodium silicate was hydrolyzed and the SiO2 particles were continuously deposited on the surface of CaCO3. The sodium ion of sodium silicate was removed by ionexchange resin effectively. Therefore, it made a core-shell structure. Finally, hollow silica particles were made after sintering and dissolving CaCO3 in HCl dilute solution. The calcium carbonate core was removed completly after 12h. It was proved that the important parameters influencing on the shell thickness of hollow silica were the concentration ratio of sodium silicate, the feed rate added with sodium silicate, reaction temperature, and pH value. In addition, the morphology and particle size of hollow silica were characterized by TEM, FE-SEM, EDS, BET, and FT-IR. As a result, hollow silica nanoparticles had an average size (80~120nm) , wall thickness (10~30nm) and specific surface area of 628 ~ 684m2/g. |
