Abstract
The adsorption of Tri( n)octylphosphine oxide (TOPO) in the interface of the DME in methanol and water-methanolic solutions of LiClO 4 was studied using the method of differential capacitance measurements. TOPO adsorbs at a large potential region, from small anodic to large cathodic potentials up to −1.8 V vs. SCE. The addition of water in the solution leads to an enhancement of the adsorption of TOPO. The experimental adsorption isotherms were found to be in very good agreement with Frumkin's isotherm. It was also found that within the adsorption layer there is an attractive interaction between the adsorbed TOPO molecules which is strongly dependent on the composition of the solvent. Finally, the adsorption potential difference, the maximum surface excess and the area per adsorbed TOPO molecule were calculated by the use of equations introduced by the theory of the two parallel condensers modified for the needs of the present work.
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