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Formation of Double Shells with Different Porosity on Silica Nanocores
윤석본,박대근,강애연,김용태,김용호,윤완수 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.3
We report on the preparation of hierarchically doubled shells of different porosity on monodispersive silica nanocores by the direct formation of the outer shell with larger mesopores (D > ~2.5 nm) on the surface of the initial single shell of smaller mesopores (D < ~2.5 nm). An organic template solution containing cetyltrimethylammonium bromide, 1,3,5-trimethylbenzene, and decane was used for the formation of the larger mesoporous shells, while the initial shell was prepared with the use of only one type of structure-directing agent, namely cetyltrimethylammonium bromide. The resulting core–shell silica nanoparticles are spherical, monodispersive, and show a distinct bimodal porosity. Pore sizes of those shells were easily controlled by varying the molar ratio of the pore expansion agents.