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Effect of urea and salt on micelle formation of zwitterionic surfactants
Author(s) -
ElAila H. J. Y.
Publication year - 2005
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/s11743-005-342-6
Subject(s) - chemistry , urea , pulmonary surfactant , micelle , critical micelle concentration , thermodynamics of micellization , absorbance , viscosity , inorganic chemistry , chromatography , organic chemistry , aqueous solution , biochemistry , physics , quantum mechanics
The effect of urea on micelle formation of zwitterionic surfactants was investigated by measuring conductivity, critical micelle concentration (CMC), relative viscosity, and the spectrophotometric shift in wavelength. We examined two zwitterionic surfactants, N,N ‐dimethyl dodecylamine N ‐oxide and N,N ‐dimethyl tetradecylamine N ‐oxide (DMTAO). The CMC values of the surfactants increased with the addition of urea. Also, the relative viscosity of the surfactant solutions decreased at higher concentrations of urea and increased with increasing KCl concentration. The absorbance maxima of the surfactants decreased with increasing urea concentration.