Abstract
The apparent molar volumes and heat capacities of sodium perfluoroalkanoates, NaCF3(CF2)xCOO, for x equal to 0, 1, 2, 4, and 6, were measured in water at 25 °C, and also at 5 and 55 °C in the case of NaCF3(CF2)6COO, from densities and heat capacities per unit volume. The CF2 contribution to the standard partial molar volumes and heat capacities are (23.57 ± 0.05) cm3·mol-1 and (124 ± 1) J·K-1·mol-1, respectively. The data for NaCF3(CF2)4COO and NaCF3(CF2)6COO were analyzed with a mass-action model to obtain the thermodynamic properties of micellization of the surfactants. The volumes and heat capacities of micellization at 25 °C are respectively (8.8 and 11.2) cm3·mol-1 and (−443 and −587) J·K-1·mol-1. At 5 °C, NaCF3(CF2)6COO is too close to the Krafft temperature to obtain data for the surfactant in the micellized form. At 55 °C, the volume and heat capacity of micellization are significantly smaller in magnitude than those at 25 °C.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
