Thermophysical properties of binary mixtures (dimethyl carbonate+ketones) at T=(303.15, 308.15 and 313.15)K

Measuring the Density, Viscosity, Surface Tension, and Refractive Index of Binary Mixtures of Cetane with Solketal, a Novel Fuel Additive

“…As for the variation of Δ G E with the molar fraction, the values are mostly positive, with the exception of mixtures close to extreme composition. Positive values of this magnitude are indicative of the dominance of specific interactions among the molecules of the compounds in the binary mixture, whereas negative values denote that dispersion forces prevail . Here, the effect of an increase of the temperature resulted in lower values of Δ G E .…”

“…The positive V E values are thought to be caused by packing effects in the mixture, with an increasing presence of cetane leading to the disruption of the hydrogen bonding that may form among solketal molecules. The negative values, for their part, may be caused by packing of oversized molecules, which can result in interstitial void space that becomes filled by smaller molecules . As for the effect of the temperature, an increase causes the hydrogen bonds to break, which is the reason why the values are more and more positive as this variable increases …”

“…The values are presented in Table together with the viscosity deviations, which were calculated with the expression where μ is the absolute dynamic viscosity of the mixture and μ 1 and μ 2 are those of the pure components n -hexadecane and solketal, respectively. Furthermore, Table also includes the excess Gibbs free energy of activation for viscous flow, Δ G E in which R is the ideal gas constant, T is the temperature, and V , V 1 , and V 2 refer to the molar volumes of the mixture and pure compounds. V can be calculated as that is, the first addend of the definition of the molar excess volume according to the definition given in eq .…”

“…Table shows the refractive indices, the corresponding molar refractivities, and also the deviation of this property, Δ R m , which is obtained as follows: where R 1 and R 2 are the molar refractivities of cetane and solketal, respectively, and ϕ 1 and ϕ 2 represent the volume fractions of the mentioned compounds, which may be calculated from the molar fractions, x i , and molar volumes, V i , with eq . Figure represents the deviations derived from eq with respect to the volume fraction of each of the components at each temperature tested, as customary for this property. , As with the other properties, the Redlich–Kister fitted curve is shown, with the corresponding coefficients being present in Table .…”

Excess Volumes, Viscosities and Refractive Index for the Binary Mixtures of Acetophenone, Cyclopentanone, Cyclohexanone and 3-pentanone with Dibutyl Maleate at T = (303.15, 308.15 and 313.15) K

“…In continuation of our program of research on the physicochemical properties of binary nonelectrolyte liquid mixtures of esters [4][5][6]. We report here experimental densities (), viscosities (), and refractive indices (n D ) for dibutyl maleate + acetophenone, + cyclopentanone, + cyclohexanone and + 3-pentanone at (303.15, 308.15 and 313.15) K over the entire range of mixture composition at atmospheric pressure.…”