Binary Mixtures Of Dimethyl Sulphoxide Research Articles

Evaluation of viscosity in binary mixtures of dimethyl sulphoxide at 298.15K

The viscosity of binary mixtures of dimethyl sulphoxide with different alcohols such as methanol, ethanol, 1-propanol, iso-propanol, 1-butanol, iso-butanol, tertiary butanol has been determined at 298.15K. The experimental values are compared with theoretical values evaluated by different theories. It is observed that for some theories, values are in agreement with the experimental values. Further, an attempt has been made to study the intermolecular interactions in studied solutions in terms of excess free energy of mixing, strength of interaction parameters and interaction energy. The viscosity data of pure liquids and their mixtures are needed to design various chemical processes where heat and mass transfer are important.

X-ray structural studies on microscopic mixing in binary mixtures of dimethyl sulphoxide with acetonitrile and N,N-dimethylformamide

The liquid structures of binary acetonitrile (AN)–dimethyl sulphoxide (DMSO) and N,N-dimethylformamide (DMF)–DMSO mixtures were investigated by the X-ray scattering method. Comparison of the X-ray scattering data of AN–DMSO liquid mixtures with those of neat AN and DMSO revealed that the intermolecular AN–DMSO interactions are practically not detected; that is, the X-ray scattering data of the liquid mixtures are well reproduced by summing up those of neat AN and DMSO weighted by their mole fractions. The same applies for DMF–DMSO mixtures. Thus, each component solvent molecule independently forms self-assembled clusters in the liquid mixtures, the structures of which are the same as those in the neat liquids. The clusters are mixed to form macroscopically homogeneous liquid mixtures. The thermodynamic quantities on mixing process for the AN–DMSO, DMF–DMSO and AN–DMF systems in the literature are well elucidated on the basis of the microscopic structure of the liquid mixtures.

A Study of Acoustical and Transport Properties of Binary Mixtures of Dimethyl Sulphoxide and Acetonitrile with Water at 303.15 K

A Study of Acoustical and Transport Properties of Binary Mixtures of Dimethyl Sulphoxide and Acetonitrile with Water at 303.15 K

Volumetric and optical study of molecular association in binary mixtures of dimethyl sulphoxide with carboxylic acid

Density and refractive index have been measured for the binary mixture of dimethyl sulphoxide (DMSO) with propanoic acid and n-butyric acid at three temperatures, 293, 303 and 313 K, over the entire composition range. Excess parameters such as excess molar volume (V E) and molar refraction deviation (ΔR m) have been calculated from the measured density and refractive index to study the molecular association between the component molecules. The V E and ΔR m values of these mixtures were fitted to the Redlich–Kister polynomial equation. Both excess parameters were plotted against the mole fraction of DMSO over the whole composition range. The values of V E and ΔR m have been found to be negative for both mixtures over the entire composition range, which suggests the presence of strong intermolecular interaction. The experimental refractive data of these mixtures were also used to test the validity of the empirical relations for the refractive index.

Ultrasonic velocity, viscosity, density and excess properties of binary mixture of dimethyl sulphoxide with propanoic acid and n-butyric acid

Ultrasonic velocity ( u), viscosity ( η) and density ( ρ) have been measured for binary mixtures of dimethyl sulphoxide (DMSO) with propanoic acid (PA) and n-butyric acid (BA) at three temperature 293 K, 303 K and 313 K, over the entire range of composition. Deviation in isentropic compressibility Δ β S, deviation in viscosity Δ η and excess free energy of activation for viscous flow Δ G⁎ E have been calculated using experimental values of ultrasonic velocity ( u), density ( ρ) and viscosity ( η). Deviation in isentropic compressibility (Δ β S) and viscosity (Δ η) as well as excess free energy of activation for viscous flow (Δ G⁎ E) were plotted against the mole fraction of DMSO over the entire composition range. The values of Δ β S have been found to be negative whereas the values of Δ G⁎ E and Δ η were positive for both the mixtures over the entire composition range. The strength and the nature of interaction between the molecules of DMSO with propanoic acid and n-butyric acid have been discussed.

Ultrasonic, volumetric and viscometric studies of molecular interactions in binary mixtures of dimethylsulphoxide with polar substituted cyclohexanes at 30°C

The densities, ρ, ultrasonic speeds, u and viscosities, η of binary mixtures of dimethylsulphoxide (DMSO) with cyclohexanol, cyclohexanone and cyclohexylamine, with DMSO as a common component, over the whole composition range expressed by mole fraction of DMSO, including those of pure liquids have been measured at 30°C. By using the experimental values of ρ, u and η, the deviations in isentropic compressibility, Δk s, excess intermolecular free length, , excess molar volume, V E, deviations in viscosity, Δη, excess free energy of activation of viscous flow, G*E, partial molar compressibility and volume, and respectively of cyclohexanol/cyclohexanone/cyclohexylamine in DMSO at infinite dilution have been calculated. The variations of these parameters with composition of the mixture suggest that the strength of interactions in these mixtures follow the order: cyclohexanol < cyclohexanone < cyclohexylamine. The isothermal compressibility, kT for these binary mixtures has been theoretically calculated by using the Flory's statistical theory and five hard sphere models and the results were compared with the experimental kT values. Further, the viscosities of these binary mixtures were theoretically predicted on the basis of various relations by using the experimental values of pure components and the results were compared with the experimental findings.

A new theoretical approach for estimating excess internal pressure

Over the years, internal pressure has proven to be an important tool for the study of intermolecular interactions in binary and multicomponent liquid mixtures. Hence prediction of this property and its corresponding excess parameters assumes paramount significance in the light of intermolecular interactions. In this regard, the assumption of mole fraction additivity of internal pressure for the ideal mixture is somewhat erroneous. In this context, a corrected and modified expression for a recently proposed relation has been presented and a comparative study carried out thereof. For this, three binary mixtures of dimethylsulphoxide(DMSO) + 1-alkanol(1-butanol, 1-hexanol and 1-octanol) at 303.15 K have been put to test.

Volumetric behaviour of binary liquid mixtures of dimethylsulphoxide with substituted benzenes at 303.15 k

Excess molar volumes (V E ) for binary mixtures of dimethyl sulphoxide (DMSO) with substituted benzenes have been measured at 303.15 K. The substituted benzenes include toluene, ethylbenzene, chlorobenzene, bromobenzene and nitrobenzene. The measured V E data is positive for the mixtures of DMSO with nitrobenzene and is completely negative over the entire composition range in the mixtures of toluene, ethylbenzene and chlorobenzene and an inversion in sign is observed in the bromobenzene system. The experimental results are analysed in terms of intermolecular interactions and effect of substitutents on benzene ring between unlike molecules.

Thermodynamic Interactions in Binary Mixtures of Dimethyl Sulphoxide with Amines From the Excess Properties of Ultrasonic Velocity, Viscosity and Density

Experimental values of density, viscosity and ultrasonic velocity are presented for the binary mixtures of dimethyl sulphoxide (DMSO) with methyl amine (CH3NH2), dimethyl amine ((CH3)2NH) and trimethyl amine ((CH3)3N) at 303.15 K over the entire mole fraction of the mixture components. From these data, excess isentropic compressibility (β E S ), excess intermolecular free-length (LE f ), excess acoustic impedance (ZE ), excess viscosity (η E ) and excess volume (VE ) have been calculated. These quantities are further fitted to the Redlich-Kister relation to estimate the binary interaction parameters and standard errors. The results are analysed in terms of nature and degree of interaction between the component molecules. The nature of variation of these excess parameters provides information about the type of interaction taking place in these binary systems.

Molecular Interaction Study on Binary Mixtures of Dimethyl Sulphoxide + Isobutyl Methyl Ketone (IBMK), + Acetylacetone and + Tri-N-Butylphosphate (TBP) from the Excess Properties of Ultrasonic Velocity, Viscosity and Density

Abstract Excess isentropic compressibility βE S, excess ultrasonic velocity (CE), excess acoustic impedance (ZE), excess intermolecular free-length (LE f) and excess viscosity (ηE) have been computed from the measured ultrasonic velocity, viscosity and density of the binary liquid mixtures of dimethyl sulphoxide (DMSO) with isobutyl methyl ketone (IBMK), acetylacetone and tri-n-butylphosphate (TBP) at 303.15 K. The results are discussed in terms of molecular interactions between the component liquids in different systems. The nature of variation of these excess parameters provides information about the type of interaction taking place in these binary systems.