ABSTRACT

The interfacial and bulk properties of the aqueous solutions of imidazolium-based ionic liquids with different halide anions ([C12mim]Cl, [C12mim]Br, [C12mim]I) were investigated by surface tension and electrical conductivity measurements. The lowest surface tension (?cmc) and maximum surface excess concentration (?max) values from the surface tension measurements showed that [C12mim]I had the highest surface activity. The thermodynamic pontentials of micellization (?G0m, ?H0m, ?S0m) indicated that the micellization of [C12mim]Cl and [C12mim]Br was entropy-driven, while that of [C12mim]I was enthalpy-driven at 15 deg C but entropy-driven above 20 deg C. This distinct behavior for [C12mim]I was thought to be due to the higher binding affinity of I to the micellar interface.

Compounds

#	Formula	Name
1	H2O	water
2	C16H31ClN2	1-dodecyl-3-methylimidazolium chloride
3	C16H31BrN2	1-dodecyl-3-methylimidazolium bromide
4	C16H31IN2	1-dodecyl-3-methylimidazolium iodide

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 2	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 2; Liquid	Temperature, K; Liquid	Liquid Gas	Ring tensiometer	12
POMD	1 2	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	CyberScan CON1500 Bench Conductivity Meter	100
POMD	1 3	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 3; Liquid	Temperature, K; Liquid	Liquid Gas	Ring tensiometer	16
POMD	1 3	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid	Liquid	CyberScan CON1500 Bench Conductivity Meter	100
POMD	1 4	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 4; Liquid	Temperature, K; Liquid	Liquid Gas	Ring tensiometer	13
POMD	1 4	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid	CyberScan CON1500 Bench Conductivity Meter	84

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Aggregation Behavior of Aqueous Solutions of 1-Dodecyl-3-methylimidazolium Salts with Different Halide Anions

Ao, M.[Mingqi], Kim, D.[Doseok]

ABSTRACT