ABSTRACT

Dynamic viscosities of several members of the 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [Cnmim][NTf2], ionic liquids family, with the cation alkyl side-chain length varying from 2 to 14 carbon atoms, have been measured in the 278.15 K to 393.15 K temperature range using two different apparatuses. To the best of our knowledge, it is the first time that such an extensive assessment of viscosity in terms of the number of compounds of a single ionic liquid homologous series, of the broad range of temperature covered, and the use of two different experimental techniques - is reported. The use of two different instruments, using different methodologies, provides information about the uncertainties in the measurement of viscosity of ionic liquids, including its dependence on the presence of traces of water and other impurities. An extensive critical analysis of the deviations between the data measured in this work and those reported in literature has been carried out.

Compounds

#	Formula	Name
1	C8H11F6N3O4S2	1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide
2	C9H13F6N3O4S2	1-methyl-3-propylimidazolium bis[(trifluoromethyl)sulfonyl]imide
3	C10H15F6N3O4S2	1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
4	C11H17F6N3O4S2	1-methyl-3-pentylimidazolium bis(trifluoromethylsulfonyl)imide
5	C12H19F6N3O4S2	1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
6	C13H21F6N3O4S2	1-heptyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide
7	C14H23F6N3O4S2	1-octyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
8	C15H25F6N3O4S2	1-methyl-3-nonylimidazolium bis(trifluoromethanesulfonyl)imide
9	C16H27F6N3O4S2	1-decyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide
10	C18H31F6N3O4S2	1-dodecyl-3-methyl-1H-imidazolium bis(trifluoromethylsulfonyl)amide
11	C20H35F6N3O4S2	1-tetradecyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	17
POMD	1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	5
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	17
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	5
POMD	3	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	17
POMD	3	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	6
POMD	4	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	17
POMD	4	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	7
POMD	5	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	17
POMD	5	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	6
POMD	6	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	18
POMD	7	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	17
POMD	8	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	18
POMD	9	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	17
POMD	9	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	7
POMD	10	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	17
POMD	11	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	11

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Viscosity of (C2-C14) 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ionic liquids in an extended temperature range

Tariq, M.[Mohammad], Carvalho, P.[Pedro], Coutinho, J. A. P.[Joao A. P.], Marrucho, I. M.[Isabel M.], Lopes, J. N. C.[Jose N. Canongia], Rebelo, L. P. N.[Luis P. N.]

ABSTRACT