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Citation: LI Li-Ying, WANG Jin-Gui, SUN Ping-Chuan, LIU Xiao-Hang, DING Da-Tong, CHEN Tie-Hong. Microporous Silica Hollow Nanospheres Templated by Anionic Polypeptide[J]. Acta Physico-Chimica Sinica, ;2008, 24(03): 359-363. doi: 10.1016/S1872-1508(08)60014-5 shu

Microporous Silica Hollow Nanospheres Templated by Anionic Polypeptide

1.
Key Laboratory of Functional Polymer Materials of the Ministry of Education, Department of Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China; College of Physics, Nankai University, Tianjin 300071, P. R. China

Received Date: 30 October 2007
Available Online: 9 January 2008

Anionic polypeptide, the poly(sodium L-glutamate), was applied to fabricate microporous silica hollow nanospheres templated by the secondary structures of the polypeptide as porogens. In the synthesis, 3-aminopropyltrimethoxysilane (APMS) and tetraethyl orthosilicate (TEOS) were used as the silica sources, and the coassembly followed the mechanism of the anionic surfactant-templated mesoporous silica (AMS) through a S-N+-I pathway, where S indicates the anionic polypeptide, I indicates inorganic precursors (TEOS), and N indicates costructure-directing agent (APMS), which interacted with the negatively charged anionic polypeptide secondary structures electrostatically and cocondensed with silica source to form the silica framework. The product was subjected to characterizations of X-ray diffraction (XRD), infrared (IR) spectroscopy, thermogravimetric (TG) analysis, scanning electron microscopy (SEM), transmitted electron microscopy (TEM), and nitrogen adsorption-desorption measurement. It was found that the pH value of the synthesis solution was an important factor to the morphological control of the silica products. Besides the microporous hollow nanospheres, microporous submicron silica solid and hollow spheres were also obtained facilely by changing the synthesis parameters. Our study further implied that anionic polypeptides, which were able to control mineralization of calcium carbonate and calcium phosphate, could also induce silica condensation in the presence of proper silica precursors. It was also expected that functional calcium carbonate (phosphate)/silica-nanocomposite materials would be fabricated under the control of the anionic polypeptide.
- Anionic polypeptide,
- Poly(sodium L-glutamate),
- Microporous,
- Silica,
- Hollow nanospheres
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