title: Hydrothermal synthesis of hollow silica spheres under acidic conditions.
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 stöber 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.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing 100084, PR China.
authors.forename: Qiyu
authors.initials: Q
authors.lastname: Yu
authors.forename: Pengpeng
authors.initials: P
authors.lastname: Wang
authors.forename: Shi
authors.initials: S
authors.lastname: Hu
authors.forename: Junfeng
authors.initials: J
authors.lastname: Hui
authors.forename: Jing
authors.initials: J
authors.lastname: Zhuang
authors.forename: Xun
authors.initials: X
authors.lastname: Wang
mesh_terms: D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D016062:Porosity; D012492:Salts / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D004396:Coloring Agents; D012492:Salts; D012822:Silicon Dioxide