PHYSICAL CHEMISTRY OF SOLUTIONS Intermolecular Interactions in Methyl Formate–Ethanol Mixtures at 303–313 K according to Ultrasonic Data1 (original) (raw)
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Molecular interactions studies in liquid mixture using Ultrasonic technique
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Density, viscosity and ultrasonic velocity have been measured for binary liquid mixtures containing Methylmethacrylate+2-Methoxy ethanol, Methylmethacrylate +2-Ethoxy ethanol, Methyl methacrylate+2 Butoxy ethanol at 303K. The adiabatic compressibility, free length, free volume, internal pressure, relaxation time, acoustic impedance and Gibbs's free energy values have been calculated from the experimental data. These parameters are used to discuss the molecular interactions in the mixtures.
The study of molecular interaction using ultrasonic technique in the binary liquid mixture of Ethanol + Glycerol as a function of the composition has been carried out at four different temperatures 3030K, 3080K, 3130K and 3180K and a fixed frequency 5MHz. The thermo-acoustic parameters such as Adiabatic compressibility (β), Intermolecular free length (Lf), Free volume (Vf), Internal pressure (πi), Relaxation time (τ) and Gibb’s free energy(ΔG*), and their excess values are evaluated from the measured values of Ultrasonic velocity (U), Density (ρ) and Viscosity (η). The molecular interaction present in the liquid mixtures such as hydrogen- bonding, dipole-dipole association, acceptor-donor and electrostriction are analyzed on the basis of these parameters. The negative values of these excess parameters suggest the presence of dipolar and dispersive interaction between the components of the molecule in the mixture while the positive values of excess thermo-acoustic parameters suggest the presence of weak interactions between the unlike molecules in the liquid mixtures.
Intermolecular interactions in ternary liquid mixtures by ultrasonic velocity measurements
Indian Journal of Physics
The excess adiabatic compressibility (ȕ E), excess free length (L f E), excess free volume (V f E) and excess internal pressure (ʌ i E) have been investigated from density, ultrasonic velocity and viscosity measurements for three ternary mixtures of methyl benzoate + cyclohexane + 1-propanol, methyl benzoate + cyclohexane + 1-butanol, methyl benzoate + cyclohexane +1-pentanol and methyl benzoate + cyclohexane + 1-hexanol at 303, 308 and 313 K and atmospheric pressure, respectively over the entire range of composition. From the experimental data, adiabatic compressibility (ȕ), free length (L f), free volume (V f)), internal pressure (ʌ i), have been calculated. The results are discussed in terms of the molecular interactions between the components of the mixture.
I. Introduction Recent development in science have found profound applications of liquid mixtures in the field of medicine, engineering, agriculture and other industrial applications, the study and understanding of thermodynamic and transport properties are more essential [1, 2]. Measurement of density and ultrasonic velocity has been adequately employed in understanding the molecular interactions in pure, binary, and higher order multi component liquid mixtures [3, 4]. The propagation of ultrasonic velocity in a medium is a thermodynamic property and has come to be recognized as a very specific and unique tool for predicting and estimating various physico-chemical properties of the liquid mixtures under consideration [5-7]. In recent years, there has been considerable interest in theoretical and experimental investigations of the excess thermodynamic properties of binary mixtures. In principle, the interaction between the molecules can be established from the study of the characteristic departure from ideal behaviour of some physical properties (i.e., volume, compressibility, and viscosity). The excess thermodynamic functions are sensitive to the intermolecular forces as well as to the size of the molecules. In order to study all these molecular-kinetic properties of liquids and liquid mixtures, low amplitude ultrasonic wave is very valuable. Ultrasonic methods have established a permanent place in science and new applications and found for the solution of many theoretical and practical problems. Most important features of ultrasonic systems are robustness, non-invasiveness, precision, low cost, rapidity and easy automation. Sometimes it become difficult to do thermo-acoustical study with actual liquid mixture system, in such cases mixtures of models compounds, often called surrogate mixtures, are useful for building an understanding of the physical properties and chemical reactions of complex fuel mixtures. Surrogate fuels can provide a baseline for engine performance, and they can help in making predictions for the more complex fuel [8-10]. A detail survey of literature shows that very less work has been done for (Nitrobenzene + Benzene) and (N, N-Dimethyl formamide + Benzene) mixtures. Keeping all these important applications of thermodynamic and acoustic study in our mind, we have studied the said property for (Nitrobenzene + Benzene) and (N, N-Dimethyl formamide + Benzene) mixtures over the entire composition range at four different temperatures T = (298, 308, 313 & 318.15) K and at one atmospheric pressure.
Indian Journal of Chemical Technology, 2006
The densities and ultrasonic velocities of binary mixtures of 2,4,6-trimethyl-1,3,5-trioxane + ethanol, 1-propanol and 1-butanol at 298.15, 303.15 and 308.15 K were measured over the whole mole fraction range. Experimental data were used to estimate isentropic compressibility (κ s ), intermolecular free length (Lf), specific acoustic impedance (Z) and their deviations. such as deviation in isentropic compressibility (Δκ s ), excess intermolecular free length (L E f ) and excess acoustic impedance (Z E ). The results are fitted to a Redlich-Kister equation. The results are discussed in terms of molecular interactions.
Asian Journal of Chemistry, 2019
Ultrasonic speeds (u) and refractive indices (n) of the binary liquid mixtures of ethanol with diisopropyl ether (DIPE) or cyclohexane or n-alkane (C6-C9) were experimentally measured from 298.15 to 318.15 K over entire composition range. Using these measurements deviation in ultrasonic speed (Δu), deviation in refractive index (Δn), excess intermolecular free length (Lf E ) and excess isentropic compressibility (Ks E ) were calculated and fitted with Redlich-Kister equation. The Δu values are negative for all binary mixture and magnitude of negative deviation for binary mixture of ethanol and n-alkane decreases as chain length increases. At equimolar composition, Ks E follows the order: n-hexane > n-heptane >n-otcane > n-nonane > diisopropyl ether > cyclohexane. Experimental results were analyzed to understand the various molecular interactions present in the binary mixtures. The u values for all binary liquid solutions were also correlated using different empirical ...
Intermolecular Interaction Studies in Binary Mixture of Methyl formate with Methanol at Various Temp
Density (ρ), viscosity (η) and ultrasonic velocity (U) have been measured for a binary mixture composed of methyl formate and methanol at 303, 308 and 313 K. The adiabatic compressibility (β), acoustic impedance (Z), free length (Lf), free volume (Vf), internal pressure (πi), viscous relaxation time (τ) and Gibbs free energy (∆G) have been calculated from the experimental data. The excess values of these parameters (β E , Z E , Lf E , Vf E , πi E , τ E and ∆G E ) have also been calculated by using the determined data and interpreted in terms of molecular interactions. The deviations in the sign and values of these excess parameters from the ideal mixing reveal that intermolecular interactions obtaining in the liquid mixture.
TJPRC
Measurement of densities (ρ), ultrasonic velocities (u) and viscosities (η) has been carried out for binary mixtures of 2-methylaniline (2-MeA) with 1-alcohols (1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, and 1-octanol) and their pure liquids at 298.15K and 308.15 K. These experimental data have been used to calculate excess volume (VE), deviation in ultrasonic velocity (Δu), deviation in isentropic compressibility (Δκs),deviation in intermolecular free length (ΔLf), deviation in acoustic impedance (ΔZ), deviation in viscosity (Δη) and excess Gibbs free energy of activation of viscous flow (G*E). The variation of these properties with composition of the mixtures suggests hydrogen bonding, dipole-dipole interaction, specific acid-base interactions and dispersive forces. The magnitude of the property is found to depend on the chain length of 1-alcohols. The viscosity data have been correlated using three equations: Grunberg and Nissan, Katti and Chaudhri, and Hind et al. These results have been fitted to the Redlich - Kister polynomial using multiparametric nonlinear regression analysis to derive the binary coefficients and to estimate the standard deviation ().
Ultrasonic study of molecular interaction in ternary liquid mixtures at 293K
Densities and ultrasonic speeds of the ternary liquid mixture of diethyl amine with acetone and acetophenone in n-hexane at 293K over the entire composition range were measured. From these data, acoustical parameters such as adiabatic compressibility (intermolecular free length (L f), acoustic impedance (Z), internal pressure ( i), excess velocity (U E), excess adiabatic compressibility ( E), excess intermolecular free length (L f E), excess acoustic impedance ( E) have been evaluated. These excess parameters have been used to discuss the nature and extent of interaction between the component molecules in the ternary mixtures. The ultrasonic speeds calculated according to Nomoto's relation, Rao's specific sound velocity theory and impedance dependence relation and are compared with those obtained experimentally.