Abstract
The adsorption of the monomethyl, monoethyl and monobutyl ethers of ethylene glycol at the free surface of water and at the uncharged Hg/solution interface has been investigated by means of surface and interfacial tension, and surface potential measurements. Results show that the adsorbability obeys Traube's rule at the air/solution interace but not at the electrode surface. The saturation surface concentration with adsorbate also differs at the two interfaces. The lateral interaction has been found to be essentially repulsive, which is interpreted in terms of hydrogen bonding of the polar groups to neighbouring water molecules in the adsorption layer, but definite quantitative differences are observed at the two interfaces. Enhanced electronic effects (dipole-dipole image interaction) and steric hindrance due to the presence of the solid wall are identified as conceivable reasons for the different behavior at the Hg/solution interface from that at the free surface of water.
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