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Influence of nonionic surfactant additive on the properties of ionic surfactant solutions
Author(s) -
Muto Shinya,
Inō Takashi,
Meguro Kenjiro
Publication year - 1972
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02582529
Subject(s) - pulmonary surfactant , sodium dodecyl sulfate , critical micelle concentration , ethylene oxide , surface tension , chemistry , micelle , thermodynamics of micellization , propylene oxide , viscosity , sodium sulfate , inorganic chemistry , sulfate , sodium , chromatography , materials science , organic chemistry , aqueous solution , copolymer , thermodynamics , polymer , biochemistry , physics , composite material
The interaction of sodium dodecyl sulfate with a nonionic surfactant (a block copolymer of ethylene oxide and propylene oxide) has been investigated by the measurement of conductivity, surface tension and viscosity. The break point on the equivalent conductivity‐square root of concentration ( λ ‐ ν c ¯ ) diagram which gives the critical micelle concentration (cmc) of sodium dodecyl sulfate became less definite by the addition of the nonionic surfactant, because of the decrease in conductivity below the cmc and increase above the cmc. The steep decrease in reduced viscosity took place in dilute concentration of sodium dodecyl sulfate solutions. In the surface tension vs. concentration diagram, the concentration at which the two linear portions of the curve intersect represents the cmc. The addition of nonionic surfactant decreases this crossed point of sodium dodecyl sulfate and finally obscures the crossed point. These reults are interpreted in terms of an interaction between sodium dodecyl sulfate and nonionic surfactant.