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A microcalorimetric method of determination of critical micellar concentration and enthalpy of micellization

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  • Colloid Science
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Zusammenfassung

Eine Methode zur Analyse der Verdünnungs-enthalpien von mizellaren Systemen wird vorgeschlagen. Messungen bei einer einzigen Temperatur ermöglichen gleichzeitig die Bestimmung der kritischen Mizellkonzentration und der Enthalpie der Mizellenbildung.

Angewandt auf ionische und nichtionische oberflächenaktive Substanzen, ergibt diese Methode Resultate, die in guter Übereinstimmung sind mit den durch andere Autoren angegebenen Werten für wässerige Lösungen dieser Substanzen bei 25 °C.

Die Bestimmung dieser beiden Parameter wird also in jedem beliebigen als Lösungsmittel benutzten Medium ermöglicht; wir haben unsere Messungen auch auf den Fall von oberflächenaktiven Substanzen in NaCl-Lösungen ausgedehnt.

Summary

A method is proposed for the analysis of dilution heats of micellar systems. Simultaneous determination of critical micellar concentration and of micellization enthalpy can be derived from measurements performed at a single temperature.

This method, when applied to ionic and non-ionic detergents, supplies results in good agreement with those published for detergents in aqueous solutions at 25 °C.

Determination of these two parameters should thus be possible for any type of solvent; further measurements were extended to detergents in solutions 0.001, 0.01 and 0.1 M in NaCl.

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Authors and Affiliations

  1. Chimie Générale I, Faculté des Sciences, Université libre de Bruxelles, Avenue F. D. Roosevelt, 50, B-1050, Bruxelles, Belgique

    S. Paredes, M. Tribout, J. Ferreira & J. Leonis

Authors
  1. S. Paredes
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  2. M. Tribout
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  3. J. Ferreira
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  4. J. Leonis
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Paredes, S., Tribout, M., Ferreira, J. et al. A microcalorimetric method of determination of critical micellar concentration and enthalpy of micellization. Colloid & Polymer Sci 254, 637–642 (1976). https://doi.org/10.1007/BF01753692

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  • DOI: https://doi.org/10.1007/BF01753692

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