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Light scattering of sodium dodecyl sulphate in methanol-water mixtures

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Summary

The effect of addition of methanol on the micellar behaviour of aqueous solutions of sodium dodecyl sulphate has been studied by light scattering measurements. At low alcohol concentration there is a small decrease in the critical micelle concentration but no change in micellar weight. With increasing alcohol concentration the critical micelle concentration increases and the micellar weight decreases, and at about a mole fraction of alcohol of 0.25 there is no evidence of micelle formation. Interpretation of the behaviour requires a knowledge as yet unknown of the part played by the changes in solvent structure and dielectric constant, and by the penetration of additive into the micelles.

Zusammenfassung

Mit Hilfe von Messungen der Lichtstreuung wurde der Einfluß von Methanol auf die Micelleigenschaften wäßriger Lösungen von Natriumdodecylsulfat untersucht. Bei niedriger Alkoholkonzentration nimmt die kritische Micellkonzentration etwas ab, ohne daß sich das Micellgewicht ändert. Mit zunehmender Alkoholkonzentration steigt dann die kritische Micellkonzentration an und das Micellgewicht nimmt ab. Bei einem Methanolgehalt von ungefähr 25 Mol.-% werden keine Micellen mehr gebildet. Eine Erklärung dieser Beobachtung ist noch nicht möglich, da unbekannt ist, wie weit Änderungen in der Lösungsmittelstruktur und in der Dielektrizitätskonstanten und das Eindringen des Additivs in die Micellen eine Rolle spielen.

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Author notes

  1. G. D. Parfitt

    Present address: Department of Chemistry, University of Nottingham, Nottingham, England

  2. J. A. Wood

    Present address: Department of Chemistry, College of Technology, Huddersfield, England

Authors and Affiliations

  1. Department of Chemistry, University of Nottingham, Nottingham, England

    J. A. Wood

Authors
  1. G. D. Parfitt
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  2. J. A. Wood
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Parfitt, G.D., Wood, J.A. Light scattering of sodium dodecyl sulphate in methanol-water mixtures. Kolloid-Z.u.Z.Polymere 229, 55–60 (1969). https://doi.org/10.1007/BF01542509

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  • DOI: https://doi.org/10.1007/BF01542509

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