Issue 8, 2012

Oxide formation on biological nanostructuresvia a structure-directing agent: towards an understanding of precise structural transcription

Abstract

Biomimetic silica formation is strongly dependent on the presence of cationic amine groups which hydrolyze organosilicate precursors and bind to silicate oligomers. Since most biological species possess anionic surfaces, the dependence on amine groups limits utilization of biotemplates for fabricating materials with specific morphologies and pore structures. Here, we report a general aminopropyltriethoxysilane (APTES) directed method for preparing hollow silica with well-defined morphologies using varying biotemplates (proteins, viruses, flagella, bacteria and fungi). Control experiments, pH evolution measurements and 29Si NMR spectroscopic studies have revealed a mechanism of the assembly of APTES on bio-surfaces with subsequent nucleation and growth of silica. The APTES assembly and nuclei formation on bio-surfaces ensured precise transcription of the morphologies of biotemplates to the resulting silica. This method could be extended to the preparation of other oxides.

Graphical abstract: Oxide formation on biological nanostructures via a structure-directing agent: towards an understanding of precise structural transcription

Supplementary files

Article information

Article type
Edge Article
Submitted
19 Nov 2010
Accepted
07 Mar 2012
First published
15 May 2012

Chem. Sci., 2012,3, 2639-2645

Oxide formation on biological nanostructures via a structure-directing agent: towards an understanding of precise structural transcription

F. Wang, S. L. Nimmo, B. Cao and C. Mao, Chem. Sci., 2012, 3, 2639 DOI: 10.1039/C2SC00583B

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