期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 71, 期 7, 页码 1013-1019出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2010.04.004
关键词
Nanostructures; Sol gel growth; Amorphous materials; Electron microscopy
资金
- National Natural Science Foundation of China [50803046]
- Foundation for Nano Science & Technology of Shanghai [0825nm02200]
- Key Laboratory of Molecular Engineering of Polymers, Fudan University, China
In this article, synthesis of nano-sized silica hollow spheres applying positive charged polystyrene as sacrificial templates was introduced. Firstly, nano-sized polystyrene particles were synthesized by emulsifier-free emulsion polymerization under solvothermal condition. Secondly, silica hollow nanospheres were formed through a simultaneous 'coating-etching' process. PVP played a key role in the evolution of nano-sized hollow spheres even if the templates were positive charged and the formation mechanism was different from that of previous studies. TEM results revealed that the morphologies of nano-sized silica hollow spheres not only strongly relied on the amount of reactant, but also the sequence of adding them. TGA illustrated that the interiors of nano-sized silica hollow spheres were not completely 'hollow'. Brunauer-Emmett-Teller (BET) analysis showed that this material had a specific area of 399 m(2)/g. The water retention property of the materials was also investigated. (C) 2010 Elsevier Ltd. All rights reserved.
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