Abstract
Abstract The results of an adsorption study of Nc, NcA and NpA at the free surface of water are compared with those previously obtained at the uncharged Hg/solution interface. The saturation surface concentrations of adsorbates differ at the two interfaces. For Nc and NcA at the air/solution interface the surface concentration is smaller than that of NpA (i.e. NpA achieves full saturation coverage, but Nc and NcA do not), whereas the opposite effect is observed at the uncharged Hg surface. The lateral interaction has been found to be essentially attractive at the free surface, whereas such an interaction is repulsive at the Hg surface; this is interpreted in terms of hydrogen bonding of the polar group to neighbouring water molecules in the adsorption layer. The former probably results from the easier replacement of water molecules from the surface layer. This effect however, decreases in the cases of Nc and NcA (particularly in the presence of 0.1 M KF) as referred to NpA molecules.
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