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Positron annihilation lifetime spectra in a metakaolin-based geopolymer
Significant nanoporosity as indicated by positron annihilation lifetime spectroscopy (PALS) has been observed in a metakaolin-based geopolymer. The nanoporosity was indicated by a component of the PALS spectrum having a lifetime of 1.5 to 2 ns, characterizing a pore diameter size of about 0.5 nm. Progressive heating to 600 deg C decreased the intensity of this spectral component from about 10 % to 2.5 %. Positron annihilation in free pore water appears to be only a minor contributor to this spectral component. The Barrett-Joyner-Halenda (BJH) method pore distribution data, derived from BET nitrogen adsorption isotherms, showed the presence of considerable meso- and macroporosity in the samples. However, these porosities were not evident in the PALS spectrum. Heating from 150 to 600 deg C progressively changed the smallest detectable pore size via the BJH method from 3.3 to 7.1 nm.
Positron annihilation lifetime spectra in a metakaolin-based geopolymer
Significant nanoporosity as indicated by positron annihilation lifetime spectroscopy (PALS) has been observed in a metakaolin-based geopolymer. The nanoporosity was indicated by a component of the PALS spectrum having a lifetime of 1.5 to 2 ns, characterizing a pore diameter size of about 0.5 nm. Progressive heating to 600 deg C decreased the intensity of this spectral component from about 10 % to 2.5 %. Positron annihilation in free pore water appears to be only a minor contributor to this spectral component. The Barrett-Joyner-Halenda (BJH) method pore distribution data, derived from BET nitrogen adsorption isotherms, showed the presence of considerable meso- and macroporosity in the samples. However, these porosities were not evident in the PALS spectrum. Heating from 150 to 600 deg C progressively changed the smallest detectable pore size via the BJH method from 3.3 to 7.1 nm.
Positron annihilation lifetime spectra in a metakaolin-based geopolymer
Positronenannihilationsspektrum in einem auf Metakaolin basierenden Geopolymer
Vance, E.R. (Autor:in) / Hadley, J.H. jun. (Autor:in) / Hsu, F.H. (Autor:in) / Drabarek, E. (Autor:in)
Journal of the American Ceramic Society ; 91 ; 664-666
2008
3 Seiten, 2 Bilder, 1 Tabelle, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
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