Ultrasonic Study of Molecular Interactions in Binary Mixtures of Benzyl Benzoate with 2-alkaxyethanols at Various Temperatures (original) (raw)
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Journal of Molecular Liquids, 2013
The experimental density, viscosity, and ultrasonic speeds of anisaldehyde (AA) and alkoxyethanols namely 2-methoxy ethanol (MOE), 2-ethoxy ethanol (EOE) and 2-butoxy ethanol (BOE) have been measured over the full range of compositions at atmospheric pressure and at different temperatures (303.15, 308.15, 313.15 and 318.15 K). From these experimental values the molar volume (Vm), adiabatic compressibility (βad) and intermolecular free length (L f), are computed and their excess properties along with deviation in viscosity (Δη) are fitted to Redlich-Kister type equation, a multi parametric nonlinear regression analysis technique to derive the binary coefficients and to estimate the standard deviation between experimental and calculated data. The experimental data of viscosity is also used to test the applicability of empirical relations of Grunberg-Nissan, Katti-Chaudhri, Heric-Brewer and Hind et al. for the systems studied. Further, FT IR analysis of these binary mixtures at different concentrations, confirms the presence of hydrogen bonding, and supported the results as observed in thermodynamic analysis with respect to forces of association/dispersion between unlike molecules. The interaction of AA with alkoxyethanol is found to decrease with increase in alkyl chain length of the alkoxy group.
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 ().
Asian Journal of Chemistry, 2018
Densities, viscosities and ultrasonic velocities of binary liquid mixtures of methyl benzoate with chlorobenzene and benzaldehyde have been measured at 308.15K and 318.15 K. By these experimental data excess volume (V E), deviation in isentropic compressibility(∆KS), deviation in viscosity (∆η) intermolecular free length (∆Lf), intermolecular free volume (∆Vf) and deviation in acoustic impedance(∆Z) were calculated. These results have been correlated with the Redlich and Kister type polynomial equation to derive the coefficients and standard errors. Significance of the calculated excess quantities were analyzed for mixtures of methyl benzoate with chlorobenzene and benzaldehyde, through which intermolecular interactions have been investigated.
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.
2003
India &mities and ultmwnic speeds have been meamred in binary mixtures of benzene with 1-pentanol , 1-heptad and 1-octand, and in the pure components, as a function of ampodtion at 35 SC. "he isentropic compressibility, intermolecular free length, relative BSSOciation, acoustic impedance, isothermal comprsiiility, the& expansion coefficient, deviations in isentropic compressibility, excess free length, excess volume, deviations in ultmonic speed, excess acoustic impedance, apparent molar comprrssibility, apparent molar v o b , partial molar volume of 1-alkanol in benzene have been calculated from the experimental data of densities and ultrasonic speeds. The variation of these parameters with cornparition indicates weak interaction between the component d d e s and this interaction decreases in the order: l-pentanol> 1-heptand > 1octand. Fhther, theoretical values of ultmwnic speeds were evaluated using free length theory, collision factor theory, Nomoto's relation and VM Dael-Vangeel ideal mixing relation. Tbe relative merits of these theories and relations were dkcused for these systems.
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.
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.
Journal of Thermodynamics, 2013
Speeds of sound and density for binary mixtures of ethyl benzoate (EB) with N,N-dimethylformamide (NNDMF), N,N-dimethyl acetamide (NNDMAc), and N,N-dimethylaniline (NNDMA) were measured as a function of mole fraction at temperatures 303.15, 308.15 K, 313.15 K, and 318.15 K and atmospheric pressure. From the experimental data, adiabatic compressibility (ad), intermolecular free length (), and molar volume () have been computed. The excess values of the above parameters were also evaluated and discussed in light of molecular interactions. Deviation in adiabatic compressibilities and excess intermolecular free length () are found to be negative over the molefraction of ethyl benzoate indicating the presence of strong interactions between the molecules. The negative excess molar volume values are attributed to strong dipole-dipole interactions between unlike molecules in the mixtures. The binary data of Δ ad , , and were correlated as a function of molefraction by using the Redlich-Kister equation.
Molecular interactions studies in liquid mixture using Ultrasonic technique
sersc.org
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.