Abstract
By the addition of acid dye to an aqueous solution of polyoxyethylene alkylamine (AmEO), a significant decrease in surface tension at lower concentrations of AmEO was observed. This observed behavior was in marked contrast to the results obtained from the interaction of polyoxyethylene alkylphenyl ether or polyoxyethylene alcohol ether (AlcEO) with acid dye, in which the values for the AlcEO solutions containing the dye were higher than those for the corresponding concentrations of AlcEO alone. Such a behavior in the AmEO-acid dye interaction system was interpreted as indicating the formation of hydrophobic complexes which were adsorbed to the surface of the solution.
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