Abstract

The adsorption of aliphatic nitriles (acetonitrile, propionitrile and butyronitrile) at the air/solution and the mercury/solution interface is compared by means of surface and interfacial tension, and of surface potential measurements. Results show that the interfacial behaviour is very similar in terms of surface pressure, but is dramatically different in terms of surface potential. The difference is rationalized on the basis of existing models for the adsorption layer, emphasizing the role played by the different orientation of solvent molecules at the two interfaces.

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