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The adsorption mechanism of water vapor in hydrophobic carbon mesopores is not clearly understood. Single wall carbon nanohorns (SWCNH) having different tube diameters in the range of 2 to 6nm were oxidized at a lower temperature than the widely used temperature of 823K. Oxidation at 633K can selectively open thinner tubes of SWCNH and then the oxidation at different times can control the mesoporosity...
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