Authors: Wei Li Yi Tian Chenhui Zhao Baoliang Zhang Hepeng Zhang Qiuyu Zhang Wangchang Geng
Publish Date: 2015/12/12
Volume: 17, Issue: 12, Pages: 480-
Abstract
In this paper the core–shell SiO2mSiO2/CTAB spheres were fabricated by choosing the solid silica spheres of different sizes as the internal cores then a series of etching experiments were conducted For different etching time and particle size different rattletype or hollow silica spheres were obtained Investigation showed that CTAB in the mesoporous shell played a very important role to the selectivity of the etching Both the rattletype and hollow structures were successfully fabricated by adjusting the etching time in the presence of CTAB but without obvious etching of mesoporous silica shell More importantly the morphology transformation depended on the particle size of the solid silica cores Generally when the particle size of the internal cores was very small d 170 nm the hollow structure was first obtained even after being etched for a short time When the particle size of the internal cores was slightly larger 200 nm d 500 nm the rattletype microspheres with doubleshell structure were first obtained after being etched for a short time then the hollow structure was obtained with prolonging etching time But when the particle size of the internal cores was far larger d 1 μm the rattletype microspheres with at least doubleshell structure were first obtained after a certain period of etching time then the hollow spheres with multishell structure were obtained with prolonging etching time It is further revealed that both the rattletype and hollow silica spheres with multishell structure could be prepared successfully if the particle size of the solid silica core was large enoughThe authors are grateful to the National Natural Science Foundation of China No 51173146 and No 21201140 Basic Research Fund of Northwestern Polytechnical University 3102014JCQ01094 3102014ZD NPU Foundation for Graduate Innovation for the financial support
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