1988•Bulletin of the Chemical Society of JapanRequires access

Relationship between Solubility and Micellization of Surfactants; Micelle Temperature Range (MTR) Instead of Krafft Point

Yoshikiyo Moroi, Ryôhei Matuura

Abstract

Abstract In order to clarify the relation between the solubility and micellization of surfactants, the micellar temperature range (MTR) is proposed instead of the usually used Krafft point. The physicochemical meaning of cmc defined by Phillips was examined from a mathematical point of view. As a result, it became clear that the temperature range for MTR is based on the concentration range for cmc, which in turn results from the polydispersity of micelles. The mass-action model of multiple association can be used to explain these facts. The MTR, thus determined by solubility and by cmc, was found to be able to explain a leveling of the MTR for homologous surfactants with an increase of the alkyl chain length and its increase of sodium dodecyl sulfate with increasing concentration of added sodium chloride.

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Key concepts: Chemistry, Krafft temperature, Micelle, Thermodynamics of micellization, Solubility, Atmospheric temperature range, Critical micelle concentration, Range (aeronautics)