State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Nanoscale. 2011 Apr;3(4):1632-9. doi: 10.1039/c0nr00893a. Epub 2011 Feb 8.
Hollow mesoporous silica spheres have recently attracted increasing attention. However, effective synthesis of uniform hollow mesoporous spheres with controllable well-defined pore structures for fundamental research and practical applications has remained a significant challenge. In this work, a straightforward and effective "cationic surfactant assisted selective etching" synthetic strategy was developed for the preparation of high-quality hollow mesoporous silica spheres with either wormhole-like or oriented mesoporous shell. The as-prepared hollow mesoporous silica spheres have large surface area, high pore volume, and controllable structure parameters. Our experiments demonstrated that cationic surfactant plays critical roles in forming the hollow mesoporous structure. A formation mechanism involving the etching of solid SiO(2) accelerated by cationic surfactant followed by the redeposition of dissolved silica species directed by cationic surfactant is proposed. Furthermore, the strategy can be extended as a general strategy to transform silica-coated composite materials into yolk-shell structures with either wormhole-like or oriented mesoporous shell.
介孔中空硅球最近引起了越来越多的关注。然而,对于基础研究和实际应用,有效合成具有可控的明确孔结构的均匀介孔中空球仍然是一个重大挑战。在这项工作中,我们开发了一种简单有效的“阳离子表面活性剂辅助选择性刻蚀”合成策略,用于制备具有蠕虫状或取向介孔壳的高质量介孔中空硅球。所制备的介孔中空硅球具有大的比表面积、高的孔体积和可控制的结构参数。我们的实验表明,阳离子表面活性剂在形成中空介孔结构中起着关键作用。提出了一种涉及阳离子表面活性剂加速固体 SiO2 刻蚀,然后由阳离子表面活性剂导向溶解的硅物种再沉淀的形成机制。此外,该策略可以扩展为一种通用策略,将涂覆有二氧化硅的复合材料转化为具有蠕虫状或取向介孔壳的蛋黄壳结构。
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