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Effects of carbonization atmosphere and subsequent oxidation on pore structure of carbon spheres observed by scanning tunneling microscopy

Published online by Cambridge University Press:  31 January 2011

M. Inagaki ,
V. Vignal ,
H. Konno  and
A. W. Morawski
M. Inagaki*
Affiliation:
Graduate School of Engineering, Hokkaido University, Kita-ku, Sapporo 060-8628, Japan
V. Vignal
Affiliation:
Graduate School of Engineering, Hokkaido University, Kita-ku, Sapporo 060-8628, Japan
H. Konno
Affiliation:
Graduate School of Engineering, Hokkaido University, Kita-ku, Sapporo 060-8628, Japan
A. W. Morawski
Affiliation:
Institute of Inorganic Chemical Technology, Technical University of Szczecin, Szczecin, Poland
*
a) Address all correspondence to this author. Present address: Aichi Institute of Technology, Department of Applied Chemistry, Yakusa, Toyota 470-0392, Japan.
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Abstract

The surface of carbon spheres was studied by using field-emission scanning electron microscopy and scanning tunneling microscopy paying particular attention to the effects of atmosphere during carbonization and of subsequent oxidation on shape and size of the entrance of micropores. Commercial spheres of glasslike carbon prepared by carbonization of phenol resin spheres in either N2 or CO2 atmosphere were subjected to the oxidation by immersing into nitric acid and then heating in air at 400 °C. The size distribution of pore entrance at nanoscopic scale was determined from scanning tunneling microscope images. Carbon spheres prepared in CO2 atmosphere had predominantly ultramicropores, but those prepared in N2 had a very low porosity. The behavior during the oxidation process in air was found to be quite different on these two carbon spheres; spheres carbonized in N2 were oxidized heterogeneously, but those in CO2 showed homogeneous oxidation, giving a high density of ultramicropores.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 7 , July 1999 , pp. 3152 - 3157
Copyright
Copyright © Materials Research Society 1999

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References

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