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Temperature dependence of micellar weight of non-ionic surfactant in the presence of various additives

Part I. Addition of n-decane or n-decanol

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Summary

By means of light scattering techniques, the micellar weight of methoxy-polyoxyethylene decyl ether (MPd-12) and that of sodium dodecyl sulfate (SDS) have been measured as a function of temperature. The effects of the solubilized n-decane and n-decanol on the micellar weight have also been studied at different temperatures. From the data it has been concluded: 1) that the micellar weight of MPd-12 increases with elevation of temperature, whereas the micellar weight of SDS decreases with temperature; 2) that the apparent second virial coefficient in the aqueous solution of MPd-12 decreases with temperature and that in 0.1 m. NaCl solution of SDS increases with temperature; 3) that in the aqueous solution of MPd-12 containing solubilized n-decane or n-decanol, the micellar weight increases with temperature in both cases, but the patterns of increase are different from each other.

Zusammenfassung

Mittels Lichtstreuung wurden die Mizellgewichte von Methoxypolyoxyäthylendecyläther (MPd-12) und von Natriumdodecylsulfat (SDS) als Punktion der Temperatur gemessen. Die Effekte des solubilisierten n-Dekans und n-Dekanols auf das Mizellgewicht wurden bei verschiedener Temperatur untersucht. Aus den Ergebnissen ist zu schließen:

  1. 1.

    Das Mizellgewicht von MPd-12 wächst mit Temperaturerhöhung, während das Mizellgewicht von SDS absinkt.

  2. 2.

    Der scheinbare zweite Virialkoeffizient des MPd-12 in wäßriger Lösung nimmt mit der Temperatur ab und der von SDS in 0,1 molarer Lösung steigt mit der Temperatur.

  3. 3.

    Für MPd-12-Lösung in Wasser, die solubilisierendes Dekan oder Dekanol enthält, wächst das Mizellgewicht in beiden Fällen mit der Temperatur, aber die Art des Anstiegs ist unterschiedlich.

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Kuriyama, K. Temperature dependence of micellar weight of non-ionic surfactant in the presence of various additives. Kolloid-Z.u.Z.Polymere 180, 55–64 (1962). https://doi.org/10.1007/BF01499484

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  • DOI: https://doi.org/10.1007/BF01499484

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