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Quantitative assessment of pores in oxidized carbon spheres using scanning tunneling microscopy

Published online by Cambridge University Press:  31 January 2011

V. Vignal ,
A. W. Morawski ,
H. Konno  and
M. Inagaki
V. Vignal
Affiliation:
Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
A. W. Morawski
Affiliation:
Institute of Inorganic Chemical Technology, Technical University of Szczecin, ul. Pulaskiego 10, 70-322 Szczecin, Poland
H. Konno
Affiliation:
Graduate School of Engineering, Hokkaido University, Sapporo 060–8628, Japan
M. Inagaki
Affiliation:
Graduate School of Engineering, Hokkaido University, Sapporo 060–8628, Japan
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Abstract

Surface heterogeneity, particularly shape and size of pores on the surface of activated carbon spheres were studied by using scanning tunneling microscopy (STM) and field-emission type scanning electron microscopy (FE-SEM). Spheres were carbonized either in N2 or CO2 atmosphere and oxidized ones were used as samples. A new numerical method based on the determination of contour maps from STM images was proposed in order to determine the size distribution in micropores. These results were discussed with respect to the adsorption of gas and liquid molecules. A good correlation between Brunaner, Emmett, and Teller (BET) surface area determined from adsorption isotherms of N2 at 77 K and the number of pores with the size of 0.5–1.8 nm was observed, indicating that the proposed procedure to analyze the pore size distribution is effective.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 3 , March 1999 , pp. 1102 - 1112
Copyright
Copyright © Materials Research Society 1999

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References

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