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- W2075466019 abstract "The surface tension γ of the room temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6] in short, has been evaluated in the framework of Guggenheim’s corresponding-states analysis using experimental data taken from the literature as well as new simulation data. The critical temperature is estimated to be Tc = 1100 K ± 100 K from the surface-tension data, which are analyzed in terms of the empirical expressions of Guggenheim and of Eötvös. Adopting this value of Tc, a critical density of ρc = 0.35 g cm−3 ± 0.04 g cm−3 is obtained from the experimental coexistence curve using the linear-diameter rule. The estimates of ρc obtained from our simulation data are lower by 13−25%. According to Guggenheim, the reduced surface tension γred = cγ/(Tcρc2/3Mr−2/3), where Mr denotes the molar mass and c a constant, is supposed to be a universal function of the reduced temperature T/Tc for all pure fluids. While many nonpolar, weakly polar, and moderately polar liquids adhere to this principle of corresponding states, deviations from Guggenheim’s master curve are seen for strongly polar, hydrogen-bonding substances and for simple inorganic molten salts, such as NaCl and KCl. We find that, despite its ionicity, the data for [bmim][PF6], both from experiment and from simulation, follow the master curve for at most moderately polar liquids, thereby indicating significant differences from the physicochemical properties of simple inorganic molten salts." @default.
- W2075466019 created "2016-06-24" @default.
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- W2075466019 date "2010-02-05" @default.
- W2075466019 modified "2023-10-18" @default.
- W2075466019 title "Critical Parameters and Surface Tension of the Room Temperature Ionic Liquid [bmim][PF<sub>6</sub>]: A Corresponding-States Analysis of Experimental and New Simulation Data" @default.
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- W2075466019 doi "https://doi.org/10.1021/jp9109282" @default.
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