Abstract
Data from the adsorption of nitrogen at 77 K are interpreted in terms of surface area and porosity, for a range of carbon blacks and two porous carbons, using the BET, αs, and Dubinin–Radushkevich methods. Heat of immersion (ΔHi) data, for nonpolar (n-heptane) and polar (water) liquids are correlated with surface structure and chemistry, respectively. An average value of ΔHi≈ 107 mJ m−2is obtained for the dispersion interaction of nonporous carbon blacks by immersion inton-heptane. Where nitrogen adsorption data indicate the presence of microporosity, higher values of ΔHiare observed which are thought to contain a contribution due to enhanced adsorption forces within pores. Data from samples of one specific black, which had been oxidized to varying levels using an oxygen/ozone fluidized bed apparatus, are presented showing a linear relationship between the surface oxygen levels and their polar interaction with water.
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