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The Micellar Dissociation Concentration of Polyoxyethylene Mono N‐Decylether Nonionic Surfactants in Water
Author(s) -
Chiu YingChech,
Chang ChengYen
Publication year - 1990
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199000049
Subject(s) - chemistry , surface tension , pulmonary surfactant , turbidity , critical micelle concentration , nonionic surfactant , dissociation (chemistry) , micellar solutions , chromatography , micelle , organic chemistry , thermodynamics , aqueous solution , biochemistry , physics , oceanography , geology
This paper will demonstrate a method for determining the micellar dissociation concentration (MDC) of polyoxyethylene mono n‐decylether nonionic surfactants in water. Turbidity and surface tension measurements were applied to commercial samples without further purification. Complicated curves containing turbidity maxima and surface tension minima were obtained for some impure samples. It is difficult to determine the critical micellar concentration (CMC) for impure surfactants. Explanations are given for all curves obtained for pure and impure samples and the method of identifying the MDC values is illustrated. It is more practical for surfactant users to determine the MDC values in their own laboratory than to search for the CMC values in the literature when the surfactants arc impure.