Abstract
Surface tension (Δ σ) and electric surface potential (Δ V) measurements of aqueous solutions of some aromatic compounds (benzoic, p-toluic and p-fluorobenzoic acid, benzaldehyde, and tolualdehyde) were used to determine effective dipole moments using the Helmholtz equation. Knowing the effective dipole moments the surficial orientations of adsorbed molecules were estimated. Using the latter and applying the formula presented by R. J. Demchak and T. Fort ( J. Colloid Interface Sci. 46, 191 (1974) ) the separate components of effective dipole moments connected with reorientation of water molecules ( μ 1 ϵ 1 ), hydrophilic ( μ φ- COOH , μ φ- CHO ) and hydrophobic ( μ φ- CH 3 , μ φ- F ) groups, and local dielectric permittivities in the vicinity of these groups ( ϵ 2, ϵ 3) were calculated.
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