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Peptide-mediated deposition of nanostructured TiO2 into the periodic structure of diatom biosilica

Published online by Cambridge University Press:  31 January 2011

Clayton Jeffryes ,
Timothy Gutu ,
Jun Jiao  and
Gregory L. Rorrer
Clayton Jeffryes
Affiliation:
Department of Chemical Engineering, Oregon State University, Corvallis, Oregon 97331
Timothy Gutu
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207
Jun Jiao
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207
Gregory L. Rorrer*
Affiliation:
Department of Chemical Engineering, Oregon State University, Corvallis, Oregon 97331
*
a)Address all correspondence to this author. e-mail: rorrergl@engr.orst.edu
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Abstract

Diatoms are single-celled algae that make silica shells called frustules that possess periodic structures ordered at the micro- and nanoscale. Nanostructured titanium dioxide (TiO2) was deposited onto the frustule biosilica of the diatom Pinnularia sp. Poly-l-lysine (PLL) conformally adsorbed onto surface of the frustule biosilica. The condensation of soluble Ti-BALDH to TiO2 by PLL-adsorbed diatom biosilica deposited 1.32 ± 0.17 g TiO2/g SiO2 onto the frustule. The periodic pore array of the diatom frustule served as a template for the deposition of the TiO2 nanoparticles, which completely filled the 200-nm frustule pores and also coated the frustule outer surface. Thermal annealing at 680 °C converted the as-deposited TiO2 to its anatase form with an average nanocrystal size of 19 nm, as verified by x-ray diffraction, electron diffraction, and SEM/TEM. This is the first reported study of directing the peptide-mediated deposition of TiO2 into a hierarchical nanostructure using a biologically fabricated template.

Keywords

Biomimetic (assembly)NanoscaleTi
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 12: Biomimetic and Bio-enabled Materials Science and Engineering , December 2008 , pp. 3255 - 3262
Copyright
Copyright © Materials Research Society 2008

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References

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