Abstract
Single wall carbon nanohorns (SWNHs) were treated in vacuum at different temperatures of 473 to 1073 K. The nanostructural change due to the heat-treatment was studied by adsorption of N 2 at 77 K and H 2O at 303 K. The determined particle density showed that gas is not adsorbed in internal pores, but in interstitial pores. The high temperature treatment (HTT) in vacuo changed water adsorption, but it gave almost no influence on N 2 adsorption. The maximum nanopore volume from H 2O adsorption was observed at 673 K, indicating the interstitial nanopore change due to a local orientational change of SWNH particles.
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