Fabrication of hollow and mesoporous germania microspheres by templating against plasma-treated polystyrene microspheres |
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Authors: | Haiqing Li Chang-Sik Ha Il Kim |
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Institution: | (1) Department of Polymer Science and Engineering, Pusan National University, Pusan, 609-735, Korea; |
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Abstract: | The surfaces of monodisperse polystyrene (PS) colloids have been modified with hydroxyl groups by means of plasma treatment
technique. By templating against these surface-modified PS colloids, the germania coating PS composite microspheres were prepared
via a sol–gel process. After removal of PS cores, the resulting composite microspheres converted into hollow germania microspheres
with mesoporous structure. The shell thickness of these hollow spheres can be controlled by varying the concentration of germania
precursor. BET results indicated that the hollow germania microspheres shell exhibits slightly broader pore size distribution
than that of corresponding composite one owing to the swelling effects of the PS core during the etching process. In addition,
the as-prepared germania exhibits amorphous phase which can be converted into crystalline phase by calcination treatment.
It is worthy to noting that this fabrication protocol demonstrated a facile, low-cost and environment-benign way for fabricating
hollow germania structures by templating method. Moreover, this protocol is not limit to germania; it also could be used to
create the other hollow inorganic oxides spheres. |
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Keywords: | |
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