Surface Tension of Liquid Fluorocompounds

Abstract

This work aims at studying the surface tension of some linear, cyclic, aromatic, and R-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 Nou ¨y 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 %.

Surface tensions of imidazolium based ionic liquids: Anion, cation, temperature and water effect

“…Previous measurements have confirmed the ability of the equipment used to accurately measure interfacial tensions for hydrocarbons and fluorocarbon systems, validating the methodology and experimental procedure adopted in this work [16][17][18][19]. The liquid densities of the pure compounds necessary for the surface tension measurements using the Du Noüy ring were obtained from the literature [20][21][22][23][24].…”

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

“…The data are extremely limited, and we estimate the uncertainty in both the gas and liquid phases to be 10 %. For surface tension, we fit the available surface tension data (Ermakov & Skripov, 1969;M. G. ______________________________________________________________________________________________________ Freire, Carvalho, Queimada, Marrucho, & Coutinho, 2006;Kennan & Pollack, 1988;Skripov & Firsov, 1968;Stiles & Cady, 1952) to obtain the coefficients in Table 5, and a deviation plot is shown in Figure 163.…”

SAFT-γ force field for the simulation of molecular fluids: 8. Hetero-segmented coarse-grained models of perfluoroalkylalkanes assessed with new vapour–liquid interfacial tension data

“…Their value was calculated using a very small set of the available data for perfluoro-n-alkanes. In our current work, we calculate the fluorine parachor contributions |P|(F) as a function of temperature using a much larger pool of literature data [88][89][90]116,[128][129][130][131], which includes that used by Sakka and Ogata. The molar densities used in the calculations are, whenever possible, those reported by the original authors.…”