Surface tension of liquid fluorocompounds

abstract

This work aims at studying the surface tension of some linear, cyclic, aromatic, and alpha-substituted perfluorocarbons. Despite its fundamental interest, information about this property for these compounds is scarce, and the available data are old and present strong discrepancies among each other. The measurements were carried out in the temperature range (283 to 327) K with the Du Nouy ring method. The analysis of the experimental data shows that the molecular structure is an important factor in the surface behavior of the studied compounds since the aromatic fluorocompounds present the highest surface tensions, followed by the cyclic and substituted fluorocompounds. The linear n-perfluoroalkanes exhibit the lowest surface tension values, slightly increasing with the carbon number. The surface thermodynamic functions such as surface entropy and enthalpy were derived from surface tension values and are also reported. The experimental data were compared against the Faizullin correlation, and it is shown that this correlation describes the measured surface tensions with deviations inferior to 4 %.

keywords

INTERFACIAL-TENSION; PERFLUOROCARBON EMULSIONS; BINARY-MIXTURES; VAPOR-PRESSURE; SOLUBILITY; EICOSANE; SYSTEMS; HEPTANE; OXYGEN; WATER

subject category

Thermodynamics; Chemistry; Engineering

authors

Freire, MG; Carvalho, PJ; Queimada, AJ; Marucho, IM; Coutinho, JAP

our authors

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".