ABSTRACT

The isobaric heat capacities per unit volume in both one-phase and two-phase regions and the turbidities in the one-phase region for the significantly asymmetric binary mixtures of {water + 2,6- dimethylpyridine} and {water, or heavy water + 2,6-dimethylpiperidine} were carefully measured, from which the corresponding critical exponents were obtained and found to be consistent with the 3D-Ising values. The values of the system-dependent critical amplitudes for the heat capacity, the correlation length and the osmotic compressibility were deduced, which together with the values of the critical amplitudes related to the coexistence curves reported previously were used to test some universal critical amplitude ratios. Moreover, the importance of the heat capacity related term in the formalism of the complete scaling theory was confirmed. It was also found that the complete scaling formalism possibly becomes somewhat in applicable for the significantly asymmetric systems.

Compounds

#	Formula	Name
1	C7H9N	2,6-dimethylpyridine
2	H2O	water
3	D2O	water-d2
4	C7H15N	2,6-dimethylpiperidine

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	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	1 2	Lower consolute composition: mole fraction - 1 ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	fitting scaling equation to heat capacity	1
POMD	1 2	Lower consolute temperature, K ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	fitting scalng equation to heat capacity	1
POMD	1 2	Lower consolute temperature, K ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	VISOBS	1
POMD	1 2	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Mole fraction - 1; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	DSC	91
POMD	1 2	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	DSC	29
POMD	4 2	Lower consolute composition: mole fraction - 4 ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	fitting scaling equation to heat capacity	1
POMD	4 2	Lower consolute temperature, K ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	fitting scalng equation to heat capacity	1
POMD	4 2	Lower consolute temperature, K ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	VISOBS	1
POMD	4 2	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Mole fraction - 4; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	DSC	93
POMD	4 2	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 4; Liquid	Liquid	DSC	30
POMD	4 3	Lower consolute composition: mole fraction - 4 ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	fitting scaling equation to heat capacity	1
POMD	4 3	Lower consolute temperature, K ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	fitting scalng equation to heat capacity	1
POMD	4 3	Lower consolute temperature, K ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	VISOBS	1
POMD	4 3	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Mole fraction - 4; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	DSC	93
POMD	4 3	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 4; Liquid	Liquid	DSC	27

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Measurements of heat capacities and turbidities for binary mixtures {water + 2,6-dimethylpyridine} and {water, or heavy water + 2,6-dimethylpiperidine} in the critical regions

Xu, C.[Chen], Wang, X.[Xue], Chen, Z.[Zhiyun], Yin, T.[Tianxiang], Shen, W.[Weiguo]

ABSTRACT