Excess Molar Volume along with Viscosity, Flash Point, and Refractive Index for Binary Mixtures of <i>cis</i>-Decalin or <i>trans</i>-Decalin with C₉ to C₁₁ <i>n</i>‑Alkanes

Density, viscosity, flash point and refractive index for binary mixtures of <i>cis</i>-decalin or <i>trans</i>-decalin with nonane, decane, and undecane have been determined at pressure <i>p</i> = 0.1 MPa and different temperatures ranging from (293.15 to 323.15) K. The calculated excess molar volumes give negative values over the whole composition range for these binary systems. With the increase of mole fraction of decalin, the values of viscosity and refractive index increase continuously. The viscosity deviation and refractive index deviation are calculated, showing negative from the corresponding linear additive values. A small additional amount of the component with lower flash point leads to marked changes of flash point values of these binary mixtures

Densities, Viscosities, Refractive Indices, and Surface Tensions of Binary Mixtures of 2,2,4-Trimethylpentane with Several Alkylated Cyclohexanes from (293.15 to 343.15) K

Densities and viscosities have been measured over the whole composition ranges for the binary mixtures of 2,2,4-trimethylpentane with methylcyclohexane, ethylcyclohexane, or <i>n</i>-butylcyclohexane at temperatures <i>T</i> = (293.15 to 343.15) K and atmospheric pressure. Meanwhile, the refractive indices and surface tensions were measured at <i>T</i> = (293.15 to 323.15) K and <i>T</i> = (293.15 to 308.15) K, respectively. The excess molar volumes, <i>V</i>_m^E, the viscosity deviations, Δη, and the surface tension deviations, Δγ, for these binary systems are calculated and fitted to the Redlich–Kister equation, and the regression coefficients and the standard deviations of the fittings are given. All of the <i>V</i>_m^E, Δη and Δγ values are negative over the whole composition range for these systems. The values of Δ<i>n</i>_<i>D</i> for these binary mixtures are all small, even negligible. These results may be useful for the development of the hydrocarbon fuels

Excess Molar Volume along with Viscosity and Refractive Index for Binary Systems of Tricyclo[5.2.1.0^2.6]decane with Five Cycloalkanes

Densities, viscosities, and refractive indices have been measured for the binary system of tricyclo­[5.2.1.0^2.6]­decane with cyclohexane, methylcyclohexane, ethylcyclohexane, butylcyclohexane, or 1,2,4-trimethylcyclohexane at temperatures <i>T</i> = (293.15 to 318.15 K) and pressure <i>p</i> = 0.1 MPa. The excess molar volumes (<i>V</i>_m^E), the viscosity deviations (Δη), and the refractive index deviations (Δ<i>n</i>_D) are then calculated. The changes of <i>V</i>_m^E and Δη with the composition are fitted to the Redlich–Kister equation. The values of density, viscosity, and refractive index increase continuously with the increase of mole fraction of tricyclo­[5.2.1.0^2.6]­decane and decrease with the rise of temperature. The <i>V</i>_m^E and Δη are all negative over the whole composition range for these five binary systems. The changes of <i>V</i>_m^E and Δη are discussed from the points of view of molecular interactions in the binary systems

Volumetric Properties and Viscosity <i>B-</i>Coefficients for the Ternary Systems Epigallocatechin Gallate + MCl + H₂O (M = Li, Na, K) at Temperatures 288.15–308.15 K

Epigallocatechin gallate (EGCG) is the most abundant and active components in tea. In this text, the density and viscosity of ternary aqueous solution of EGCG containing LiCl/NaCl/KCl were determined at temperatures ranging from 288.15 to 308.15 K at atmospheric pressure. The density data was used to compute the apparent molar volumes (<i>V</i>_φ), limiting partial molar volumes (<i>V</i>_φ⁰), and transfer partial molar volumes (Δ_trs<i>V</i>_φ⁰). The viscosity <i>B</i>-Coefficients were calculated from the measured viscosity data using the extended Jones–Dole equation. The values of density and viscosity increased continuously with the increasing of molality of EGCG and decreased with the temperature increasing. The positive values including (<i>V</i>_φ, <i>V</i>_φ⁰, Δ_trs<i>V</i>_φ⁰, viscosity <i>B</i>-Coefficients, the free energies of activation for solvent Δμ₁^0≠, and for solute Δμ₂^0≠) and Helper’s constant (∂²<i>V</i>_φ⁰/∂<i>T</i>²)_p close to zero indicated the presence of strong solute–solvent interactions and the structure–making effect of EGCG in the investigated solutions. The apparent molar isobaric expansions (<i>E</i>_φ⁰) decreasing with temperature suggested that the solute–solvent interactions became weaker as temperature increased. These significant parameters could provide necessary data about molecular interactions occurring in simulated body fluids