RT info:eu-repo/semantics/article
T1 Density and speed of sound of (iodobenzene + n-alkane) liquid mixtures at T = (288.15 to 308.15) K. Application of the Prigogine-Flory-Patterson model
A1 Hevia de los Mozos, Luis Fernando
A1 Lozano Martín, Daniel
A1 González López, Juan Antonio Mariano
A1 Sanz, Luis Felipe
A1 García de la Fuente, Isaías Laudelino
A1 Cobos Hernández, José Carlos
K1 Thermodynamics
K1 Polimeros y polimerización
K1 Iodobenzene
K1 Prigogine-Flory-Patterson model
K1 Density
K1 Yodobenceno
K1 Modelo Prigogine-Flory-Patterson
K1 Densidad
K1 22 Física
AB (Iodobenzene + n-alkane) liquid mixtures have been studied experimentally, in terms of densities (ρ) and speeds of sound (c), and theoretically, by the application of the Prigogine-Flory-Patterson (PFP) model. The n-alkanes considered are n-heptane, n-decane, n-dodecane, and n-tetradecane. ρ and c measurements have been performed at a pressure p = 0.1 MPa and in the temperature range T = (288.15 to 308.15) K. Excess molar volumes (VEm ) and excess isentropic compressibilities (κES) have been calculated and correlated by Redlich-Kister polynomials.(∂VE m /∂T)p curves at the same (p, T) conditions have been obtained from correlated VEm values. The mixtures are characterized by the following features: (i) VEm increases with the number of carbon atoms of the n-alkane (n), being negative for n = 7, small and S-shaped with positive and negative values for n = 10, and positive for n = 12 and n = 14; (ii) κES and (∂VE m /∂T)p are negative, increase with n and are very close to zero for n = 14. From these experimental results and the knowledge of the excess molar enthalpies of mixtures containing fluorobenzene, chlorobenzene or bromobenzene with n-alkanes, we have inferred the presence of structural effects, especially important for n = 7 and less relevant for volumetric properties as n increases. The VEm obtained are compared with those of other (halogenated benzene + n-alkane) liquid mixtures existing in the literature, namely systems with fluorobenzene, chlorobenzene, and bromobenzene. From this comparison and the analysis of the isobaric thermal expansion coefficients of the pure compounds, it is inferred that the interactional effects on VEm do not vary appreciably with the length of the n-alkane, so the observed VEm variation is fundamentally determined by the corresponding variation of the contribution from structural effects. Moreover, the application of the PFP model supports this interpretation, providing free volume contributions to VEm that vary parallelly to VEm with thelength of the n-alkane, and interactional contributions that rest approximately constant independently of the n-alkane size.
PB Elsevier
SN 0378-3812
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/64598
UL https://uvadoc.uva.es/handle/10324/64598
LA eng
NO Fluid Phase Equilibria, 2024, vol. 578, 114017
NO Producción Científica
DS UVaDOC
RD 22-dic-2024