ABSTRACT

Densities (q), surface tensions (r), and absolute viscosities (g) of binary mixtures of N,N-dimethylformamide (DMF) with toluene have been measured over the entire composition range at the temperatures (278.15, 283.15, and 293.15) K. The excess molar volumes (VE), the excess surface tensions (rE), the deviations in viscosity (Dg), and the excess free energies of activation of the viscous flow (DG*E) have been calculated. The excess thermodynamic properties VE, rE, Dg, and DG*E were fitted to the Redlich Kister polynomial equation, and the Ak coefficients as well as the standard deviations between the calculated and experimental values have been derived. The surface tension values have been further used to calculate the surface entropy (SS) and surface enthalpy (HS) per unit surface area. The lyophobicity (b) and the surface mole fraction oxS2 P of the surfactant toluene have been also derived using the extended Langmuir model. The results obtained are discussed from the viewpoint of the existence of interactions between the components in the bulk and the surface.

Compounds

#	Formula	Name
1	C3H7NO	dimethylformamide
2	C7H8	toluene

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	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Gas	RINGTE::UFactor:2	3
POMD	1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	CAPTUB::UFactor:8	3
POMD	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	VIBTUB::UFactor:8	3
POMD	2	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Gas	RINGTE::UFactor:2	3
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	CAPTUB:UFactor:8	3
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	VIBTUB::UFactor:8	3
POMD	1 2	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid		Liquid Gas	RINGTE:UFactor:2	36
POMD	1 2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	CAPTUB:UFactor:8	36
POMD	1 2	Mass density, kg/m3 ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:8	36

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Thermodynamic investigation of N,N-dimethylformamide/toluene binary mixtures in the temperature range from 278.15 to 293.15 K

Tsierkezos, N. G.[Nikos G.], Filippou, A. C.[Alexander C.]

ABSTRACT