Temperature-Dependent Studies of Thermo-Acoustic Parameters in Hexane + E 1-Dodecanol and Application of Various Theories of Sound Speed (original) (raw)
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Zeitschrift für Physikalische Chemie, 2007
The observed experimental values of sound speed, mass density and viscosity at three different temperatures viz. 298, 308 and 318K have been used to compute the derived parameters. As excess parameters are better measures of intermolecular interactions these are calculated with the help of derived parameters. Excess parameters calculated are excess molar volume (V m E), excess molar free volume (V mf E), excess intermolecular free length (L f E), deviation in isentropic compressibility (ΔKs), deviation in viscosity (Δη), excess acoustic impedance (Z E) deviation in sound speed (Δu), and excess internal pressure (π i E), excess enthalpy (H E) and excess Gibb´s free energy of activation of viscous flow (G *E). The sign and magnitude of these excess parameters provide the detail information about the type and extent of intermolecular interactions over the entire composition and temperature range. These excess parameters are fitted to Redlich–Kister polynomial equation to get informatio...
Journal of Solution Chemistry, 2007
Densities (q), viscosities (g), and speeds of sound (u) of the ternary mixture (1-heptanol + trichloroethylene + methylcyclohexane) and the involved binary mixtures (1-heptanol + trichloroethylene), (1-heptanol + methylcyclohexane), and (trichloroethylene + methylcyclohexane) at 298.15 K were measured over the whole composition range. The data obtained are used to calculate excess molar volumes (V E), excess isobaric thermal expansivity (a E), viscosity deviations (Dg), excess Gibbs free energies of activation of viscous flow (DG * E), and excess isentropic compressibilities ðj E S Þ of the binary and ternary mixtures. The data of the binary systems were fitted to the Redlich-Kister equation while the best correlation method for the ternary system was found using the Nagata equation. Viscosities, speeds of sound and isentropic compressibilities of the binary and ternary mixtures have been correlated by means of several empirical and semi-empirical equations. The best correlation method for viscosities of binary systems is found using the Iulan et al. equation and for the ternary system using the McAllister equation. The best correlation method for speeds of sound and isentropic compressibilities of the binary systems is found using the IMR and for the ternary system using the IMR and JR.
journal, 2021
In this analysis, the ultrasonic velocity, density and viscosity of DMSO were measured at different temperatures of 308K, 313K, 318K, 323K, 328K and 333K with butanol. Acoustical parameters such asacoustic impedance (), adiabatic compressibility (), Intermolecular freelength (), relaxation time (), internal pressure () have been determined from these. The variety of derived parameters was used to analyze the form and scope of interactions between the binary molecules.
On the behaviour of thermo-acoustic parameters in different liquids
Journal of Molecular Liquids, 2006
The thermo-acoustical parameters of liquids are evaluated in Jterms of the coefficient of thermal expansion on the assumption that the Moelwyn-Hughes parameter is the dominant factor. The Moelwyn-Hughes parameter has been utilized to establish some simple relations between the lattice Gruneisen parameter, Beyer's nonlinearity parameter, Rao's acoustical parameter, Sharma's thermo-acoustical parameter, the fractional available volume, the repulsive exponent of intermolecular potential, the Anderson-Gruneisen parameter and the molecular constant. A relationship between the isothermal, isochonc and isobanc Gruneisen parameters has also been studied. The parameter Y (compressibility) is found to be close to 0.09 from which one may infer that the normal modes of vibrations contnbuting to heat capacities are very small Sharma's parameter has been found to be approximately constant in the case of liquids studied.
Journal of Molecular Liquids, 2012
Experimental values of densities (ρ), and speeds of sound (u) at T = 298.15 K in the binary mixtures of n-octane, n-decane, n-dodecane and n-tetradecane with octan-2-ol are presented over the whole range of mixture composition. From these data, excess molar volumes (V m E), excess isentropic compressibility (k E s), excess intermolecular free length (L f E), excess specific acoustic impedance (Z E) and excess available volume (V a E) 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, calculated by using collision factor theory (CFT), free length theory (FLT) and Nomoto's empirical equation (NOM) and the results have been compared with experimental values. The deviation from the ideality of these parameters is explained on the basis of molecular interactions between components of the mixture.
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/excess-thermodynamic-and-acoustic-properties-for-equimolar-mixture-of-ethyl-benzoate-and-1-alkanols-with-benzene-at-303.15-k https://www.ijert.org/research/excess-thermodynamic-and-acoustic-properties-for-equimolar-mixture-of-ethyl-benzoate-and-1-alkanols-with-benzene-at-303.15-k-IJERTV4IS010456.pdf Densities (), viscosity () and speed of sound (U) values for the liquid mixture systems of ethyl benzoate + 1-propanol/1-butanol/1-pentanol with benzene including those of pure liquids were measured over the entire mole fraction range at T=303.15 K. From these experimentally determined values, various thermo-acoustic parameters such as excess isentropic compressibility (K s E), excess molar volume (V E) and excess free length (L f E), excess Gibb's free energy (G *E) and excess enthalpy (H E) have been calculated. The excess functions have been fitted to the Redlich-Kister type polynomial equation. The deviations for excess thermo-acoustic parameters have been explained on the basis of the intermolecular interactions present in these liquid mixtures. The theoretical values of speed of sound in these mixtures have been evaluated using various theories and has been compared with experimentally determined speed of sound values in order to check the applicability of such theories to the liquid mixture systems under study. Viscosity data has been used to test the applicability of standard viscosity models of Grunberg-Nissan, Hind-Mc Laughlin, Katti-Chaudhary, Heric and Brewer, Frenkel and Tamura and Kurata for the liquid systems under study.
Estimation of Sound Velocity in the Ternary Liquid System at 303.15, 308.15 and 313.15 K
Journal of Advanced Physics, 2013
Various theoretical models have been applied to evaluate the sound velocity values at 303.15, 308.15 and 313.15 K for the system of benzene, chloroform with cyclohexane are studied and compared with the experimental values. The validity of Nomoto (NR), Van Deal-Vangeal (IMR), Impedance dependence relation (IDR), Collision factor theory (CFT) and Nutsch-Kuhnkies (NK) methods is checked and a comparative study of the above models is made. The non-ideal behavior of the systems is explained in terms of molecular interactions of the constituents of the mixture.
E-Journal of Chemistry, 2012
Ultrasonic velocity, density and viscosity of the ternary mixture of 1, 4-dioxane + chloroform + cyclohexane, were measured at 303.15, 308.15 and 313.15 K. The thermodynamical parameters such as adiabatic compressibility (β), intermolecular free length (L f ), free volume (V f ), internal pressure (π i ), acoustic impedance (Z), molar sound velocity (R) and molar compressibility (W) have been obtained from the experimental data for all the mixtures, with a view to investigate the exact nature of molecular interaction. Adiabatic compressibility and intermolecular free length decrease with increase in concentration and temperature. The other parameters show almost increasing concentration of solutes. These parameters have been further used to interpret the molecular interaction part of the solute and solvent in the mixtures.
2015
The observed experimental parameters such as density (ρ), and ultrasonic velocity (U) of butanol, toluene and pyridine were measured over the entire range of composition at different temperatures 303,313,323 K. The observed experimental data have been utilized to evaluate some of the excess thermo-acoustical parameters such as excess volume (V E ), excess adiabatic compressibility (βa E ) and excesses free length (L f E ). Thermo-acoustic parameters are also calculated theoretically by applying Jacobson's free length theory and Kalidoss revised free length theory, statistical Chi-square (χ 2 ) test applied to both the theories, applicability of liquid theories
IJCA (Indonesian Journal of Chemical Analysis), 2020
Measurements of physico-acoustic properties at ultrasonic level have been studied intensively for the binary mixture of 2-Butanol + m-Xylene system as a function of the composition at 298.15K to 323.15K by 5K intervals and at atmospheric pressure. Acoustic impedance(Z), excess acoustic impedance (ZE) and molar sound velocity (R) have been evaluated from the experimental values of speeds of sound and densities. The variation of these properties with composition and temperature suggests the presence of diopole-induced dipole interactions, hydrogen bond, induced electrostatic and dispersion forces. The observed negative values of ZE over the entire composition range of the system reinforce significant interactions between unlike molecules those dominate over other types. The variation of molar sound velocity (R) of the entire mixture suggests the rarefaction of the liquid mixture under study.