Web Release Date: February 28,
Liquid Phase Behavior of Perfluoroalkylalkane Surfactants
and
Centro de Química Estrutural, Instituto Superior Técnico, 1049-001 Lisboa, Portugal, Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, Departamento de Física Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, 21071 Huelva, Spain, and Instituto de Tecnologia Química e Biológica, ITQB2, Universidade Nova de Lisboa, Avenida República, Apartado 127, 2780-901 Oeiras, Portugal
Received: May 22, 2006
In Final Form: October 18, 2006
Abstract:
We have performed a combined experimental and theoretical study of the thermodynamic properties of semifluorinated alkanes. In particular, the liquid density of perfluorohexylhexane (F6H6) and perfluorohexyloctane (F6H8) has been measured as a function of temperature from 273.15 to 353.15 K and at four temperatures as a function of pressure up to 600 bar. The results were interpreted using the SAFT-VR equation of state. The perfluoroalkylalkanes were modeled as heterosegmented diblock chains using parameters for the alkyl and perfluoroalkyl segments developed in earlier work. Through this simple approach, we are able to predict the thermodynamic behavior of the perfluoroalkylalkanes studied without fitting to any experimental data for the systems being studied.
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