3/7/2023 0 Comments Phi 2 multispecThe experimental density, d, values as function of ionic liquid concentration, m, for binary mixtures, MSO(4) + methanol, + water, + DMSO,+ DMF, and + MeCN at T = (298.15-328.15) K are reported. Comparisons of the experimental data and measurements from the literature with values calculated by the correlations at different temperatures and pressures are presented. With regard to viscosity, the maximum absolute deviation and the AAD of the present results from the correlation for dimethoxymethane are 1.55% and 0.40%, respectively, and for 1,2-dimethoxyethane, are 1.05% and 0.26%. The maximum absolute deviation and the average absolute deviation (AAD) of the density measurements from the correlation for dimethoxymethane are 0.065% and 0.012%, respectively, and for 1,2-dimethoxyethane, are 0.16% and 0.044%. The measurements were correlated with a Tait-type equation for density and a hard-sphere model for viscosity. The overall uncertainties of these results are 2.0% in viscosity and 0.2% in density. The measurements were performed simultaneously using a vibrating-wire instrument operated in the forced mode of oscillation. ![]() Measurements of the density and viscosity of dimethoxymethane and 1,2-dimethoxyethane are reported over the temperature range from 243 K to 373 K and at pressures up to 20 MPa. All of these parameters were used to interpret the effect of ionic liquid on the solute solvent interactions and solvation behavior occurring between ionic liquid and Schiff bases in these solutions in terms of scaled particle theory (SPT). These data have been used to calculate apparent molar volumes, V-phi, standard partial molar volumes, V-phi(0), transfer partial molar volumes, Delta V-tr(phi)0, pair volumetric interaction parameters, V-sl, triplet volumetric interaction parameters, V-sll, (calculated using McMillan Mayer theory) interaction volumes, V-int, and cavity volumes, (V) over bar (cav), (calculated by use of scaled particle theory) for the solutions studied. Two tetradentate N2O2 type Schiff bases, 8-amino-naphthalene (Salnaph) and N,N-bis(salicylidene)-1,2-cyclohexadiamine (Salcn), have been synthesized and their densities in ionic liquid, 1-penthyl-3-methylimidazolium bromide (Br)+N,N-dimethyl formamide (DMF) solutions measured at 298.15 K. The infrared spectroscopy was performed to study the chemical structure to further understand the interactions between IL and the solvents. The hard-sphere model was employed to reproduce the viscosity. Furthermore, based on the measurement values, the derived properties of excess molar volumes, thermal expansion coefficient, and the energy barrier were calculated, and the results showed that the mixture composition had great impact on excess volume change and viscosity. The influences of the solvents on the thermophysical properties of ionic liquid were quantitatively studied. The thermophysical properties of density and viscosity for IL with solvents were measured using a digital vibrating U-tube densimeter and an Ubbelohde capillary viscometer from 303.15 to 338.15 K at atmospheric pressure (0.0967 MPa), respectively. In this work, due to the high viscosity of IL, the promising chemicals (i.e., N, N-dimethylacetamide, N, N-dimethylformamide, and dimethyl sulfoxide) were selected as the additives to lower IL viscosity. The ionic liquid (IL) of 1-hexyl-3-methylimidazolium acetate is widely used in chemical and bio-chemical processes. Furthermore, the fluidity of this binary solvent system was analysed and interpreted following Hildebrand and modified-Hildebrand correlation models. Some derived quantities such as thermodynamic parameters of the viscous flow (ΔG∗, ΔH∗ and ΔS∗), have been calculated on the basis of Eyring's model. Sign and magnitude of these quantities have been discussed in terms of type and nature of specific intermolecular interactions. Starting from the experimental data, the excess kinematic viscosities (νE) have been calculated. ![]() ![]() The measured values have been used to test some empirical equations of the type ν=ν(T), ν=ν(χi, and ν=ν(T,χi), in order to obtain useful correlation models with predictive ability in correspondence of the experimental data gaps. The kinematic viscosities (ν) of liquid binary mixtures of N,N-dimethylformamide and 1,2-dimethoxyethane were measured at 19 temperatures in the range −10⩽ t / ☌ ⩽ 80, employing the pure species and 9 their solutions covering the whole miscibility range expressed by the condition 0 ⩽ χi ⩽ 1.
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