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Application of the calorimetry to studies of colloidal phenomena

Enthalpies of micellization and enthalpies of adsorption of zwitterionic surfactants onto silica gel

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Abstract

The importance of calorimetric methods in studies of colloidal phenomena is illustrated by the analysis of the experimental enthalpies of dilution and adsorption for aqueous solutions of three zwitterionic surfactants: 1–12 betaine, 3–12 betaine, and 3–12 sulfobetaine. The batch microcalorimeter ‘Montcal 3’, used to obtain these data, is described. The molar enthalpies of micellization and the differential molar enthalpies of adsorption onto silica gel are shown to be functions of the headgroup hydrophilicity, fixed by the type of negatively charged center and the number of methylene groups separating the charged sites.

Zusammenfassung

Die Wichtigkeit der kalorimetrischen Methoden bei Untersuchungen von Kolloiderscheinungen wurde anhand der Analyse der experimentellen Verdünnungs- und Adsorptionsenthalpien für wäßrige Lösungen dreier zwitterionischer oberflächenaktiver Substanzen gezeigt: 1–12 Betain, 3–12 Betain und 3–12 Sulfobetain. Das zur Bestimmung dieser Daten eingesetzte Mikrokalorimeter “Montcal 3” wird ebenfalls beschrieben. Es wurde gezeigt, daß die molaren Mizellisierungsenthalpien und die differentiellen molaren Enthalpien der Adsorption an Kieselgel eine Funktion der Hydrophilität der endständigen Gruppe ist, festgelegt durch den Typ des negativ geladenen Zentrums und die Anzahl Methylengruppen zwischen den geladenen Punkten.

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Authors and Affiliations

  1. Lammi, U.R.A. 79, Université des Sciences et Techniques du Languedoc, pl. E. Bataillon, 34095, Montpellier Cedex 05, France

    J. Zajac, M. Chorro, C. Chorro & S. Partyka

Authors
  1. J. Zajac
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  2. M. Chorro
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  3. C. Chorro
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  4. S. Partyka
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Zajac, J., Chorro, M., Chorro, C. et al. Application of the calorimetry to studies of colloidal phenomena. Journal of Thermal Analysis 45, 781–789 (1995). https://doi.org/10.1007/BF02548895

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