Abstract
The surface tension measurements of aqueous solutions of p-(1,1,3,3-tetramethylbutyl)phenoxypoly(9.5)ethylene glycol or tert-octylphenol ethoxylate (TOP10) and cetyltrimethylammonium bromide (CTAB) mixtures with ethanol were carried out in the range of the total concentration of CTAB and TOP10 mixtures from 1 × 10−7 to 1 × 10−2 M and ethanol from 0 to 17.13 M. In the CTAB and TOP10 mixtures, the mole fractions of TOP10 were equal to 0.2; 0.4; 0.6; and 0.8, respectively. The results obtained were compared to those calculated from the Fainerman and Miller equation developed for ideal mixtures of two homologous surfactants, as well as from the Connors equation derived for the concentrated organic solutions. The calculations of the surface tension from the Fainerman and Miller equation were carried out treating the solvent and solute in a few different ways. The differences between the measured and calculated values of the surface tension were discussed in the light of molecular interaction parameter and the composition of the surface layer. The composition of the mixed surface layer at the solution-air interface was evaluated according to Rosen using the nonideal solution theory with the assumption that water with ethanol is a mixed solvent. Knowing the values of mole fractions of CTAB and TOP10 in the surface layer, the molecular interaction parameter was determined.
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The financial support from Polish Ministry of Science and Higher Education, Project No. N N204 352040 is gratefully acknowledged.
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Bielawska, M., Jańczuk, B. & Zdziennicka, A. Behavior of Cetyltrimethylammonium Bromide, tert-Octylphenol (9.5 EO) Ethoxylate and Ethanol Mixtures at the Water–Air Interface. J Surfact Deterg 16, 203–212 (2013). https://doi.org/10.1007/s11743-012-1379-3
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DOI: https://doi.org/10.1007/s11743-012-1379-3