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

Abstract

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