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Surface and thermodynamic parameters of sodium N ‐acyl sarcosinate surfactant solutions
Author(s) -
Gad E. A. M.,
ElSukkary M. M. A.,
Ismail D. A.
Publication year - 1997
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/s11746-997-0117-x
Subject(s) - pulmonary surfactant , surface tension , critical micelle concentration , aqueous solution , gibbs isotherm , enthalpy , adsorption , chemistry , thermodynamics , thermodynamics of micellization , micelle , gibbs free energy , molecule , sodium , isentropic process , organic chemistry , physics
Abstract Surface tension as a function of concentration and temperature was measured for solutions of N ‐acyl sarcosinates, RCON(CH 3 )CH 2 COONa. From the intersection points in the (γ‐log c) curves, the critical micelle concentration (CMC) was determined at 20, 35, 50, and 65°C. Structural effects on the CMC, maximum surface excess, and the minimum area per molecule at the aqueous solution/air interface are discussed. The free energy, enthalpy, and entropy of micellization and adsorption of surfactant solutions also were investigated.