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Thermodynamics of Micellar Systems: Volumes and Heat Capacities of Alkyldimethylamine Oxides in Water

  • J. E. Desnoyers
  • D. Roberts
  • R. DeLisi
  • G. Perron

Abstract

As part of a general study of the thermodynamic properties of micellar systems, the apparent molal volumes and heat capacities of the homologous alkyldimethylamine oxides, CxDAO, where x = 4,6,8 and 10, were measured with a flow densimeter and a flow microcalorimeter. A wide temperature range was covered with C8DA0, C6DA0 was studied at 25 and 5°C and C4DAO and C10DAO at 25°C only. The changes in volume and heat capacity during micellization are reported. The present data are compared with those of ionic surfactants and organic-aqueous mixed solvents. As with many other hydrophobic solutes which have strong acid-base interactions with water, the apparent and partial molal heat capacities of C8DAO and C10DAO pass through a sharp maximum region and then level off to a constant value.

Keywords

Heat Capacity Ionic Surfactant Micellar System Critical Micelle Concentration Apparent Molal Volume 
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 1982

Authors and Affiliations

  • J. E. Desnoyers
    • 1
  • D. Roberts
    • 1
  • R. DeLisi
    • 1
  • G. Perron
    • 1
  1. 1.Department of ChemistryUniversité de SherbrookeSherbrookeCanada

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