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Mechanisms of Al and titania hydrogel complex formation via a mechanical route

Published online by Cambridge University Press:  31 January 2011

Yuumi Kojima ,
Tetsuhiko Isobe ,
Mamoru Senna ,
Takeshi Shinohara ,
Sakai Ono ,
Kenji Sumiyama  and
Kenji Suzuki
Yuumi Kojima
Affiliation:
Institute for Materials Research, Tohoku University, Katahira, Sendai 980, Japan
Tetsuhiko Isobe
Affiliation:
Institute for Materials Research, Tohoku University, Katahira, Sendai 980, Japan
Mamoru Senna*
Affiliation:
Institute for Materials Research, Tohoku University, Katahira, Sendai 980, Japan
Takeshi Shinohara
Affiliation:
Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama 223, Japan
Sakai Ono
Affiliation:
Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama 223, Japan
Kenji Sumiyama
Affiliation:
Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama 223, Japan
Kenji Suzuki
Affiliation:
Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama 223, Japan
*
a) Author to whom all correspondence should be addressed.
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Abstract

The process of complex formation has been studied during milling a powder mixture of metallic Al and titania hydrogel, TiO2 · H2O. Solid state 27Al NMR and ESR are employed together with conventional x-ray diffractometry and thermal analyses. Al atoms partly changed from metallic to oxide state. 27Al NMR analyses indicate that two metallic Al states are allotted to distorted and undistorted lattices, while the other to AlOx units in the oxide state, where x is 4, 5, or 6. As detected by ESR, Ti4+ was partly reduced to Ti31, suggesting a redox reaction during milling. A vigorous thermit reaction was detected during subsequent heating of the mixture after prolonged milling. These results indicate the formation of Al–O–Ti bonds during milling, leading to Al2TiO5 on subsequent heating.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 5 , May 1996 , pp. 1305 - 1309
Copyright
Copyright © Materials Research Society 1996

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References

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