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Natural rutile-derived titanate nanofibers prepared by direct hydrothermal processing

Published online by Cambridge University Press:  01 April 2005

Yoshikazu Suzuki ,
Sorapong Pavasupree ,
Susumu Yoshikawa  and
Ryoji Kawahata
Yoshikazu Suzuki*
Affiliation:
Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
Sorapong Pavasupree
Affiliation:
Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
Susumu Yoshikawa
Affiliation:
Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
Ryoji Kawahata
Affiliation:
Iwatani International Corporation, Osaka 541-0053, Japan
*
a) Address all correspondence to this author. e-mail: suzuki@iae.kyoto-u.ac.jp
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Abstract

Long titanate nanofibers (typically 10–500 μm in length and 20–50 nm in diameter) were successfully prepared in high yield by the direct hydrothermal processing using natural rutile as a starting material. Fourier transform infrared spectroscopy, transmission electron microscopy, energy dispersive x-ray spectroscopy, electron diffraction, and x-ray diffraction demonstrated that the as-synthesized nanofibers presumably consisted of sodium hydrogen trititanate [(Na,H)2Ti3O7, e.g., Na0.4H1.6Ti3O7] including some hexatitanate-type defects [(Na,H)2Ti6O13]. A partial topotactic condensation model explained their nanostructure well. Although the as-synthesized fibers are defective, they can be cured by a post-heat-treatment in air. The direct hydrothermal treatment for natural rutile will be a promising low-cost process for one-dimensional nanomaterials, which can act not only as a reaction step but also as a purification step.

Keywords

HydrothermalIon-exchange materialNanofiber
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 1063 - 1070
Copyright
Copyright © Materials Research Society 2005

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