Thermodynamic Analysis of the Breakdown of w/o -Microemulsion Aggregates due to Changes in the Composition of the Solvent

  • J. B. Rosenholm
  • C. Jolicoeur
Chapter

Abstract

The density and the heat capacity have been measured at 298 K for the thermodynamically stable decanolic, pentanolic and propanolic solutions, respectively, containing water and sodium octanoate. The apparent molar volume and heat capacity of the surfactant are used to investigate how the successive breakdown of association structures, caused by the increased miscibility of water with the alcohols, is reflected in the thermodynamic parameters chosen. Furthermore, it is investigated if the data collected might be used to select between two association models proposed for these types of w/o-micro-emulsion systems. It was found that no unambiguous support can be given for either of the models. The data suggest, however, that inverted micelles are present whenever the amount of hyd-rated surfactant exceeds the limit referred to as the cmc-region. A total breakup of the aggregates seems to occur when the amount of water dissolved in the propanol solutions exceeds the limit corresponding to the phase boundary of the pentanol and decanol systems.

Keywords

Apparent Molar Volume Colloid Polymer Alcohol System Propanol Solution Hydration Capacity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • J. B. Rosenholm
    • 1
  • C. Jolicoeur
    • 2
  1. 1.Department of Physical ChemistryÅbo AkademiÅboFinland
  2. 2.Department of ChemistryUniversité de SherbrookeSherbrookeCanada

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