Ultrasonic study of molecular interaction in ternary liquid mixtures at 293K (original) (raw)
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ULTRASONIC INTERACTION STUDIES OF TERNARY MIXTURE SOLUTIONS AT 303 AND 313 TEMPERATURE
Journal of Engineering Technologies and Management Research, 2020
Densities and ultrasonic velocities of Aniline in cyclohexane + Dimethyl ketone and Aniline in cyclohexane + ethyl methyl ketone of these ternary mixtures of different compositions have been determined experimentally at 303 and 313 K. The results obtained from density and ultrasonic velocity measurement have been used to calculate the acoustical parameters such as, adiabatic compressibility (Ks), free Length (Lf) , and acoustic impedance (Z). The results are discussed in terms of the intermolecular hydrogen bonding and molecular association in these ternary systems.
The density (ρ) and ultrasonic velocity (U) for ternary mixture of dimethyl acetamide, isobutyl methyl ketone and diethyl ether at different frequencies (2MHZ, 4MHz, 6MHZ, 8MHZ) have been measured at 308K. These data have been used to compute adiabatic compressibility (Ks), intermolecular free length (Lf), acoustic Impedance (Z), molar volume (Vm), molar sound velocity(R), molar compressibility (B), available volume (Va), Lennard Jones potential repulsive term exponent(n), relative association(RA), interaction parameter (χ) and excess values of some of the above parameters for the entire range of mole fraction of DAMC and are interpreted to explain molecular interaction occurring in the liquid mixture.
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.
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.
Acoustical and Thermodynamical Properties of Ternary Liquid Mixtures at 303.15 K
Chemical Science Transactions, 2012
The observed experimental parameters such as density (ρ), viscosity (η) and ultrasonic velocity (U) of ternary liquid mixtures of primary alkanols such as 1-propanol, 1-butanol, 1-pentanol and 1-hexanol with N-N dimethylfomamide (DMF) in acetophenone at 303.15 K were determined. The observed experimental data have been utilized to evaluate some of the thermo acoustical parameters and also their excess values such as adiabatic compressibility (β E), intermolecular free length (L f E), free volume (V f E), internal pressure (π i E), Gibb's energy (∆G E) and viscosity (η E). Our present investigation observes that the interaction between DMF (Proton acceptor) and 1-alkanols is due to hydrogen bonding. There seems to be a dissociation of associated structure of 1-alkanols and decrease in interaction (hydrogen bonding) between acetophenone and 1-alkanols on further addition of DMF. It is also noticed that on further addition of DMF leads to subsequent decrease in interaction between ketone (acetophenone) and 1-alkanols as well as between DMF and 1-alkanol, which eventually resulting in existence of weak molecular interactions in the present system of liquid mixtures.
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.
Theoretical Investigation of Ultrasonic Studies and Molecular Interactions in Binary Liquid Mixtures
2013
The ultrasonic velocity can be measured using a single crystal variable path interferometer with 2MHZ by standard procedure. Using the ultrasonic velocity, various acoustical parameters such as adiabatic compressibility(βa), free length(Lf), acoustic impedance(Z), free volume(Vf), molar volume(V), internal pressure(∏i), relaxation time( ), Rao , s constant(R), Enthalpy(H), Wada , s constant(W), apparent molar volume(фv), apparent molar compressibility(фk) can be calculated. Using the experimental and computed data excess parameters such as excess adiabatic compressibility (β E ), excess acoustic impedance (Z E ), excess intermolecular free length (Lf E ), excess volume(Δv), excess viscosity(Δɳ), can be computed. The density and viscosity for the binary liquid mixtures can be measured by using the specific gravity bottle method and Ostwald viscometer respectively. This papers investigates the theoretical aspects for the ultrasonic and molecular interactions in binary liquids.