Single-step synthesis of nanoporous silica colloids |
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| Authors: | Weiwei Yan Liyi Shi Shuai Yuan Yin Zhao Jianhui Fang Jian Zhao |
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| Affiliation: | a Research Center of Nanoscience and Nanotechnology, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China
b Essilor Asia Pacific PTE LTD, 215 Kallang Bahru #02-00, Essilor Building, Singapore 339346, Singapore |
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| Abstract: | Nanoporous silica colloids were prepared by a convenient single-step sol-gel process. In this approach, acidic aluminum nitrate (Al(NO3)3) solution was added to the ethanol solution of tetraethoxy orthosilicate (TEOS). In the preliminary stage, alumina/silica core-shell particles were formed. Then the Al2O3 cores were dissolved subsequently with the decrease of pH value, and the nanoporous silica was formed. The porous silica particles were characterized by transmission electron microscopy (TEM). The formation mechanism of the porous silica was discussed. |
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| Keywords: | Sol-gel preparation Nanomaterials Nanoporous silica Colloids |
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