ABSTRACT

Liquid + liquid coexistence, light scattering, and isobaric heat capacity per unit volume for the critical solutions of (benzonitrile + n-nonane) have been measured. The critical exponents relating to the coexistence curve beta, the osmotic compressibility gamma the correlation length nu, and the heat capacity alpha have been deduced and the values are consistent with the 3D-Ising values in the range close to the critical point. The experimental results of the liquid + liquid coexistence were analyzed to examine the Wegner correction terms and the behaviour of the diameter of the coexistence curves. The light scattering data were well described by the crossover model proposed by Anisimov and Sengers, and showed a tendency of monotonic crossover of the critical exponents gamma and nu from the 3D-Ising values to the mean-field values as the temperature departures from the critical point. From calorimetric measurements, the amplitude A+- and the critical background Bcr of the heat capacity in the critical region have been deduced and some universal ratios are tested.

Compounds

#	Formula	Name
1	C7H5N	benzonitrile
2	C9H20	nonane

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	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	6
POMD	2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	7
POMD	1 2	Upper consolute temperature, K ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	VISOBS	1
POMD	1 2	Upper consolute composition: mole fraction - 1 ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	equal volume method	1
POMD	1 2	Mole fraction - 1 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Index of refraction calibration data	17
POMD	1 2	Mole fraction - 1 ; Liquid mixture 2	Temperature, K; Liquid mixture 2	Pressure, kPa; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	Index of refraction calibration data	17
POMD	1 2	Refractive index (other wavelength) ; Liquid mixture 2	Temperature, K; Liquid mixture 2	Pressure, kPa; Liquid mixture 2 Wavelength, nm; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	Standard Abbe refractometry	17
POMD	1 2	Refractive index (other wavelength) ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1 Wavelength, nm; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Standard Abbe refractometry	17
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	22
POMD	1 2	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Large sample (1 g) DSC	114

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Critical behaviour of binary mixture of {xC6H5CN + (1 - x)CH3(CH2)7CH3}: Measurements of coexistence curves, light scattering, and heat capacity

Lei, Y.[Yuntao], Chen, Z.[Zhiyun], Wang, N.[Nong], Mao, C.[Chunfeng], An, X.[Xueqin], Shen, W.[Weiguo]

ABSTRACT