Thermodynamics of micellization of tetraethylammonium perfluorooctylsulfonate in water.
Conductivity, density, and sound velocity measurements as functions of temperature were made on tetraethylammonium perfluorooctylsulfonate solutions to determine the Krafft point, the dependence on temperature of the critical micelle concentration, the micellar ionization degree, and several thermodynamic properties: Gibbs free energy, enthalpy and entropy of micellization, apparent molar partial volume, thermal expansion coefficient, and the adiabatic compressibility factor of both micellized and unmicellized surfactants. Important changes occur at about 30 degrees C. Results are interpreted on the basis of dehydration of surfactant on micellization and on temperature increase.
López-Fontán
José L
JL
Grupo de Biofísica e Interfases, Departamento de Física Aplicada, Facultade de Física, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
González-Pérez
Alfredo
A
Costa
Julian
J
Ruso
Juan M
JM
Prieto
Gerardo
G
Schulz
Pablo C
PC
Sarmiento
Félix
F
D017738:Alkanesulfonic Acids / Q000737:chemistry*; D005466:Fluorocarbons / Q000737:chemistry*; D008823:Micelles; D013451:Sulfonic Acids / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D013757:Tetraethylammonium Compounds / Q000737:chemistry*; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
D017738:Alkanesulfonic Acids; D005466:Fluorocarbons; D008823:Micelles; D013451:Sulfonic Acids; D013501:Surface-Active Agents; D013757:Tetraethylammonium Compounds; D014867:Water; C076994:perfluorooctane sulfonic acid