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Enhanced hydrothermal conversion of surfactant-modified diatom microshells into barium titanate replicas

Published online by Cambridge University Press:  03 March 2011

Eric M. Ernst ,
Ben C. Church ,
Christopher S. Gaddis ,
Robert L. Snyder  and
Kenneth H. Sandhage
Eric M. Ernst
Affiliation:
Center for Biologically Enabled Advanced Manufacturing, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
Ben C. Church
Affiliation:
Center for Biologically Enabled Advanced Manufacturing, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
Christopher S. Gaddis
Affiliation:
Center for Biologically Enabled Advanced Manufacturing, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
Robert L. Snyder*
Affiliation:
Center for Biologically Enabled Advanced Manufacturing, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
Kenneth H. Sandhage
Affiliation:
Center for Biologically Enabled Advanced Manufacturing, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
*
a) This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy.
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Abstract

The three-dimensional nanostructured SiO2-based microshells of diatoms have been converted into nanocrystalline BaTiO3 via a series of shape-preserving reactions. The microshells, obtained as diatomaceous earth, were first exposed to a surfactant-induced dissolution/reprecipitation process [C.E. Fowler, et al., Chem. Phys. Lett.398, 414 (2004)] to enhance the microshell surface area, without altering the microshell shape. The SiO2 microshells were then converted into anatase TiO2 replicas via reaction with TiF4 gas and then humid oxygen. Hydrothermal reaction with a barium hydroxide-bearing solution then yielded three-dimensional nanocrystalline microshell replicas composed of BaTiO3. The enhanced surface area of the surfactant-treated microshells resulted in faster conversion into phase-pure BaTiO3 at 100 °C.

Keywords

Biological synthesis (assembly)Chemical reactionNanostructure
Type
Rapid Communications
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1121 - 1127
Copyright
Copyright © Materials Research Society 2007

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