Thermophysical properties of sulfonium- and ammonium-based ionic liquids
authors Bhattacharjee, A; Luis, A; Santos, JH; Lopes-da-Silva, JA; Freire, MG; Carvalho, PJ; Coutinho, JAP
nationality International
journal FLUID PHASE EQUILIBRIA
author keywords Ionic liquids; Density; Viscosity; Refractive index; Surface tension
keywords TEMPERATURE MOLTEN-SALTS; EXTENDED PRESSURE RANGE; SENSITIZED SOLAR-CELLS; SURFACE-TENSION MEASUREMENTS; THERMODYNAMIC PROPERTIES; PHYSICOCHEMICAL PROPERTIES; ELECTROCHEMICAL PROPERTIES; LOW-VISCOSITY; CARBON-DIOXIDE; BIS(TRIFLUOROMETHYLSULFONYL)IMIDE ANION
abstract Experimental data for the density, viscosity, refractive index, and surface tension of four sulfonium- and ammonium-based ionic liquids (ILs) with the common bis(trifluoromethylsulfonyl)imide anion were measured in the temperature range between 288.15 and 353.15K and at atmospheric pressure. The ILs considered include butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, [N-4111][NTf2], tributyl-methylammonium bis(trifluoromethylsulfonyl)imide, [N-4441][NTf2], diethylmethylsulfonium bis(trifluoromethylsulfonyl)imide, [S-221] [NTf2], and triethylsulfonium bis(trifluoromethylsulfonyl)imide, [S-222][NTf2]. Based on the gathered results and on data taken from literature, the impact of the cation isomerism and of the size of the aliphatic tails, as well as the effect resulting from the substitution of a nitrogen by a sulfur atom as the cation central atom, on the thermophysical properties of sulfonium- and ammonium-based Its is discussed here. Remarkably, more symmetric cations present a lower viscosity for the same, and sometimes even for higher, alkyl chain lengths at the cation. Additional derivative properties, such as the isobaric thermal expansion coefficient, the surface thermodynamic properties and the critical temperature for the investigated ILs were also estimated and are presented and discussed. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0378-3812
year published 2014
volume 381
beginning page 36
ending page 45
digital object identifier (doi) 10.1016/j.fluid.2014.08.005
web of science category Thermodynamics; Chemistry, Physical; Engineering, Chemical
subject category Thermodynamics; Chemistry; Engineering
unique article identifier WOS:000343386000005
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journal impact factor 2.197
5 year journal impact factor 2.214
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