✍ Scribed by Eugène Papirer; Sheng Li; Alain Vidal
No coin nor oath required. For personal study only.
Carbon blacks were treated with P,S, in the 60 to 500°C temperature range for increasing times of treatment of up to four hours. A series of experimental methods was applied to follow the formation of sulfur surface derivatives: elemental analysis, basic surface groups analysis by back-titration, ESCA, and FTIR. It was shown that surface carbonyl groups are transformed into thiones whereas, on air exposure, after P2S, treatment, oxygen content increases significantly, demonstrating the formation of other sulfur groups very sensitive to oxidation. These groups are decomposed upon water extraction of the blacks. The surface properties, as shown by water adsorption isotherms, are modified.
📜 SIMILAR VOLUMES
The reaction of carbon black surface with 2,2-diphenyl-1-picrylhydrazyl (DPPH) in carbon tetrachloride has been studied. It was found that DPPH abstracts hydrogen atoms from the surface of the carbon black and gives the corresponding hydrazine (DPPH2), while hydrazyl radicals were found not to bind