Hydrothermal synthesis of hollow silica spheres under acidic conditions |
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Authors: | Yu Qiyu Wang Pengpeng Hu Shi Hui Junfeng Zhuang Jing Wang Xun |
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Affiliation: | Department of Chemistry, Tsinghua University, Beijing 100084, PR China. |
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Abstract: | It is well-known that silica can be etched in alkaline media or in a unique hydrofluoric acid (HF) solution, which is widely used to prepare various kinds of hollow nanostructures (including silica hollow structures) via silica-templating methods. In our experiments, we found that sto?ber silica spheres could be etched in generic acidic media in a well-controlled way under hydrothermal conditions, forming well-defined hollow/rattle-type silica spheres. Furthermore, some salts such as NaCl and Na(2)SO(4) were found to be favorable for the formation of hollow/rattle-type silica spheres. |
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