Ionic transport across tailored nanoporous anodic alumina membranes |
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Authors: | Romero V Vega V García J Prida V M Hernando B Benavente J |
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Institution: | a State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China b Department of Chemistry, School of Science, Wuhan University of Technology, Wuhan 430070, China c Materials Research and Testing Center, Wuhan University of Technology, Wuhan 430070, China |
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Abstract: | Monodispersed silica particles with bimodal size distribution were successfully prepared through adding an ethanol (EtOH) solution containing tetraethylorthosilicate (TEOS) dropwise into an ammonia EtOH solution at a constant low rate. The effects of the reaction parameters such as ammonia/ethanol ratio, feeding rate of TEOS solution, reaction temperature, and time on the size and size distribution of the as-obtained particles were investigated. Based on these phenomena, a modified LaMer model of nucleation and growth mechanism was proposed to reasonably explain the formation of the as-obtained silica particles with bimodal size distribution. The as-prepared monodispersed silica particles with bimodal size distribution can be directly fabricated into binary colloidal crystals with small particles surrounding large particles by evaporation-induced cooperative self-assembly. This suggests that the method reported here provides a straightforward and effective route to the in situ fabrication of novel binary colloidal crystals and their replicated patterns in one reaction system. |
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Keywords: | Silica particles Bimodal size distribution Formation mechanism Secondary nucleation Binary colloidal crystals |
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