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Effect of Amino Acids on Micellization, Surface Activity and Micellar Properties of Nonionic Surfactant Hexadecyl Alcohol Ethoxylate (25EO) in Aqueous Solutions
Author(s) -
Harutyunyan Lusine R.
Publication year - 2015
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-014-1609-y
Subject(s) - chemistry , thermodynamics of micellization , aqueous solution , critical micelle concentration , gibbs isotherm , aggregation number , micelle , pulmonary surfactant , surface tension , amino acid , micellar solutions , glycine , adsorption , alcohol , organic chemistry , thermodynamics , biochemistry , physics
The effects of amino acids ( dl ‐glycine, dl ‐alanine, dl ‐phenylalanine, dl ‐serine, l ‐leucine, l ‐aspartic acid, l ‐lysine) on the micellization, surface activity, viscometric and aggregation properties of hexadecyl alcohol polyethoxylate (25EO) in aqueous solution were studied. The critical micelle concentration and free energy of micellization were evaluated and discussed. The surface excess concentration, the minimum area per molecule, the surface pressure at the critical micelle concentration and the standard free energy of adsorption were obtained from surface activity studies. On the basis of the determination of the relative viscosities on concentration, the viscosity B ‐coefficients of the Jones–Dole semiempirical equation were calculated for the premicellar and postmicellar regions. The method of fluorescence quenching was used for determination of the micellar aggregation number of hexadecyl alcohol polyethoxylate (25EO) in aqueous solution in the presence of amino acids. It was found that among studied amino acids serine shows behavior that is different from that of the other neutral amino acids.