Contribution to the study of the surface groups on carbons—II: Spectroscopic methods

✍ Scribed by Eugene Papirer; Eric Guyon; Noel Perol

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 841 KB
• Volume: 16
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(78)90010-6

✦ Synopsis

Electron spectroscopy was applied to the study of a colour black (Carbolac 1) and of graphitic oxide, modified by esterification of the acidic surface groups. The deconvolution of the O,, spectra indicates that in the case of carbon black irreversible transformations of the surface structure occur, On the contrary, for the methylated graphite oxide, a subsequent hydrolysis of the ester groups restores the original structure. IR Spectroscopy (transmission and internal reflection spectroscopies) confirms this observation: the irreversible transformation intervenes during the hydrolysis step of the methylated black.

Use of a tracer technique gives direct support to the hypothesis of an enol structure which appears to become partiaily blocked. Possibly, the labile hydrogen involved in the keto-enol equilib~um is substituted by an alkyl group. The differences in behaviour of the surface groups of carbon black and graphite oxide can be explained on the basis of their location on solid supports having different electronic properties.