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Hydrothermal synthesis of zirconia nanocrystals in supercritical water

Published online by Cambridge University Press:  03 March 2011

Yukiya Hakuta ,
Tomotugu Ohashi ,
Hiromichi Hayashi  and
Kunio Arai
Yukiya Hakuta*
Affiliation:
Supercritical Fluid Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
Tomotugu Ohashi
Affiliation:
Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 07,Aoba-ku, Sendai 983-8551, Japan
Hiromichi Hayashi
Affiliation:
Supercritical Fluid Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
Kunio Arai
Affiliation:
Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 07,Aoba-ku, Sendai 983-8551, Japan
*
a)Address all correspondence to this author. e-mail: y-hakuta@aist.go.jp
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Abstract

Zirconia nanocrystals were prepared by hydrothermal reaction of 0.05 M zirconyl nitrate and zirconyl acetate solutions at supercritical conditions of 400 °C and30 MPa for 1.8 s reaction time. Characterization of products were performed byx-ray diffraction, transmission electron microscopy, and Brunauer–Emmett–Teller measurements. The product particles were compared with zirconia particles prepared by conventional hydrothermal synthesis routes and precipitation-calcination. From the results, zirconia powders prepared in supercritical water had higher crystallinity than those obtained by other methods. Product particles with tetragonal crystal structure with a mean diameter of 6.8 nm could be formed from 0.05 M zirconyl acetate solution in the presence of 0.1 M potassium hydroxide at supercritical conditions.

Keywords

NanoparticleHydrothermalMorphology
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 8 , August 2004 , pp. 2230 - 2234
Copyright
Copyright © Materials Research Society 2004

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