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Dense millimeter-tall carpets of vertically aligned carbon nanotubes (VACNTs) were grown using thermal chemical vapor deposition (CVD) from ethylene and hydrogen gases with two or three independently controlled hot zones while introducing controlled flows of oxygen. Through preheating, oxygen and hydrogen reacted through a multi-step reaction to form water, enabling the growth of tall CNT carpets...
Despite significant progress in carbon nanotube (CNT) synthesis by thermal chemical vapor deposition (CVD), the factors determining the structure of the resulting carbon filaments and other graphitic nanocarbons are not well understood. Here, we demonstrate that gas chemistry influences the crystal structure of carbon filaments grown at low temperatures (500°C). Using thermal CVD, we decoupled the...
Magic-angle spinning 31 P NMR spectra have been obtained for trimethylphosphate, triethylphosphate and dimethylmethyl phosphonate on three activated carbons for a variety of loading conditions up to 60 w/w%. At low loadings a broad resonance band is seen at ca. 8 ppm to low frequency of the signal for the neat liquid adsorbate. This is ascribed to overlap of bands from adsorbate molecules...
Magic-angle spinning deuterium NMR spectra have been used to evaluate the effects of activation to different extents of nutshell and coal-based carbon substrates on the adsorption of water (D 2 O). In general, separate signals are seen for water adsorbed in the micropores and in larger channels or at particle surfaces. The unactivated carbon shows negligible micropore adsorption except when...
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