Molecular interactions in binary liquid mixtures of <i style="mso-bidi-font-style:normal">n</i>-alkanes with higher alkanol: Ultrasonic, volumetric and viscometric studies

624-629From experimental values of densities, viscosities, and speeds of sound at 298.15 K of the binary mixtures of n-octane, <i style="mso-bidi-font-style: normal">n-decane, n-dodecane and n-tetradecane with octan-2-ol, excess molar volume (VmE), deviations in viscosity (Δη) and excess isentropic compressibility (<span style="font-family:Symbol; mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:"times="" roman";="" mso-char-type:symbol;mso-symbol-font-family:symbol"="" lang="EN-GB">ksE) have been calculated. The large positive VmE values and negative deviations in viscosity for binary mixtures are attributed to the breaking up of the three-dimensional H-bonded network of octan-2-ol due to the addition of solute, which is not compensated by the weak interactions between unlike molecules. The theoretical values of speed of sound and isentropic compressibility have also been estimated using the Prigogine-Flory-Patterson theory with the van der Waals potential energy model and shows good performance in predicting excess molar volumes of mixtures of -alkanes+octan-2-ol. Bloomfield-Dewan model and Jouyban-Acree model show good agreement between the estimated and experimental values for the studied binary systems

Study of binary liquid mixture of n-decane and validation of theoretical approaches of sound speed at 298.15 K

236-245Experimental values of densities (ρ) and speeds of sound (u) at T=298.15 K in the binary mixtures of n-decane with hexan-2-ol, heptan-2-ol and octan-2-ol are presented over the whole range of mixture composition. From these data, excess molar volumes (VmE), excess isentropic compressibility (kEs), excess intermolecular free length (LfE), excess specific acoustic impedance (ZE), excess available volume (VaE) and excess internal pressure (πE) have been calculated. These results were fitted to Redlich-Kister polynomial equations to estimate the binary coefficients and standard errors. Comparisons of theoretical ultrasonic speeds have been calculated by using collision factor theory (CFT), free length theory (FLT), Nomoto’s empirical equation (NOM), Jouyban-Acree model and Prigogine-Flory-Patterson (PFP) theory with Van der Waals (vdW) potential energy model and the results have been compared with experimental values. Extensive work is carried out to judge the best suitable model out of CFT, NOM, FLT, PEP theory and Jouyban-Acree model. The deviation from ideality of these parameters is explained on the basis of molecular interactions between components of the mixture

Excess molar volumes and deviation in viscosities of binary liquid mixtures of acrylic esters with hexane-1-ol at 303.15 and 313.15 K

Densities and viscosities for the four binary liquid mixtures of methyl acrylate, ethyl acrylate, butyl acrylate and methyl methacrylate with hexane-1-ol at temperatures 303.15 and 313.15 K and at atmospheric pressure were measured over the entire composition range. These values were used to calculate excess molar volumes and deviation in viscosities which were fitted to Redlich–Kister polynomial equation. Recently proposed Jouyban Acree model was also used to correlate the experimental values of density and viscosity. The mixture viscosities were correlated by several semi-empirical approaches like Hind, Choudhary–Katti, Grunberg–Nissan, Tamura and Kurata, McAllister three and four body model equations. A graphical representation of excess molar volumes and deviation in isentropic compressibility shows positive nature whereas deviation in viscosity shows negative nature at both temperatures for all four binary liquid mixtures. Positive values of excess molar volumes show that volume expansion is taking place causing rupture of H-bonds in self associated alcohols. The results were discussed in terms of molecular interactions prevailing in the mixtures

Assessment of ground water quality in and around Industrial areas in Aurangabad district of Maharashtra

The suitability of water for various domestics and potable uses was studied by analyzing samples from different bore well sampling sites, located in and around industrial areas in Aurangabad. The physico-chemical parameter of above sampling sites indicates that domestically used water is much more polluted. Maximum samples have high EC. TDS. TH. TA. Cl-. Ca ++. COD. Values exceeding the permissible limits for drinking purpose. It is observed that the main sources of the pollution are due to industrial waste water, municipal sewage and lack of sanitation