Journal
CARBON
Volume 42, Issue 7, Pages 1243-1248Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2004.01.038
Keywords
carbon nanotubes; soot; adsorption properties; density; porosity
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Hydrogen adsorption data on as-grown and heat-treated single walled carbon nanotubes (SWNTs) obtained by a volumetric procedure using a Quantachrome Autosorb-1 equipment are presented. The amounts of hydrogen adsorbed at atmospheric pressure reach approximately 0.01 wt.% at 298 K and I wt.% at 77 K. The isosteric heat of adsorption has been calculated for both samples from H-2 equilibrium adsorption data at three temperatures, having initial values of 7.42 and 7.75 kJ mol(-1). Studies in porous structure by N-2 adsorption and density measurements in helium pycnometer are reported. (C) 2004 Elsevier Ltd. All rights reserved.
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