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Characterization of activated carbon fibers by positron annihilation lifetime spectroscopy (pals)

Lozano-Castello, D. and Cazorla-Amoros, D. and Linares-Solano, A. and Hall, P.J. and Fernandez, J.J. (2000) Characterization of activated carbon fibers by positron annihilation lifetime spectroscopy (pals). In: Characterisation of Porous Solids V, Proceedings of the 5th International Symposium on the Characterisation of Porous Solids (COPS-V). Studies in Surface Science and Catalysis, 128 . Elsevier, Heidelburg, Germany, pp. 523-532. ISBN 9780444502599

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Abstract

The use of Positron Annihilation Lifetime Spectroscopy (PALS) technique to characterize porous carbon materials has been analyzed. Positron annihilation lifetimes have been measured in two series of petroleum pitch-based activated carbon fibers (ACF) prepared by CO2 and steam activation. Two lifetime components were found: a short-lived component, σ1 from 375 to 393 ps and a long-lived component, σ2 from 1247 to 1898 ps. The results have been compared to those obtained by Small Angle X-Ray scattering (SAXS) and N2 and CO2 adsorption at 77K and 273K respectively. The correlation found demonstrates the usefulness of PALS to get complementary information on the porous structure of microporous carbons.