authors 
LosadaPerez, P; PerezSanchez, G; Cerdeirina, CA; Troncoso, J; Romani, L 
nationality 
International 
journal 
JOURNAL OF CHEMICAL PHYSICS 
author keywords 
critical points; liquid mixtures; organic compounds; specific heat 
keywords 
PHASEEQUILIBRIA; BINARYLIQUID; COEXISTENCECURVE; PRESSURE; MIXTURES; BEHAVIOR; WATER; TRIETHYLAMINE; TEMPERATURE; AMPLITUDE 
abstract 
The thermodynamic consistency of the isobaric heat capacity per unit volume at constant composition C(p,x) and the density rho near the liquidliquid critical point is studied in detail. To this end, C(p,x)(T), rho(T), and the slope of the critical line (dT/dp)(c) for five binary mixtures composed by 1nitropropane and an alkane were analyzed. Both C(p,x)(T) and rho(T) data were measured along various quasicritical isopleths with a view to evaluate the effect of the uncertainty in the critical composition value on the corresponding critical amplitudes. By adopting the traditionally employed strategies for data treatment, consistency within 0.01 K MPa(1) (or 8%) is attained, thereby largely improving the majority of previous results. From temperature range shrinking fits and fits in which higherorder terms in the theoretical expressions for C(p,x)(T) and rho(T) are included, we conclude that discrepancies come mainly from inherent difficulties in determining the critical anomaly of rho accurately: specifically, to get full consistency, higherorder terms in rho(T) are needed; however, the various contributions at play cannot be separated unambiguously. As a consequence, the use of C(p,x)(T) and (dT/dp)(c) for predicting the behavior of rho(T) at near criticality appears to be the best choice at the actual experimental resolution levels. Furthermore, the reasonably good thermodynamic consistency being encountered confirms that previous arguments appealing to the inadequacy of the theoretical expression relating C(p,x) and rho for describing data in the experimentally accessible region must be fairly rejected. 
publisher 
AMER INST PHYSICS 
issn 
00219606 
year published 
2009 
volume 
130 
issue 
4 
digital object identifier (doi) 
10.1063/1.3054351 
web of science category 
Chemistry, Physical; Physics, Atomic, Molecular & Chemical 
subject category 
Chemistry; Physics 
unique article identifier 
WOS:000262965000030

ciceco authors
impact metrics
journal analysis (jcr 2019):

journal impact factor 
2.991 
5 year journal impact factor 
2.835 
category normalized journal impact factor percentile 
60.403 
dimensions (citation analysis):


altmetrics (social interaction):


