scholarly journals Thermo Acoustic Parameters of Tetrabutylammonium Borate and Perchlorate in Non-Aqueous Solvents

2021 ◽  
Vol 37 (3) ◽  
pp. 722-734
Author(s):  
Manpreet Kaur
Keyword(s):  
Ultrasonic Velocity ◽  
Molecular Interactions ◽  
Variable Temperature ◽  
Isentropic Compressibility ◽  
Solvent Mixture ◽  
Acoustic Properties ◽  
Acoustic Parameters ◽  
Rao’S Constant ◽  
Different Temperatures ◽  
Gibb’S Free Energy

Interactions of electrolytes in a binary mixture can be determined by various techniques. Ultrasonic velocity measurements prove to be one of the important tools for measuring various acoustic properties at variable temperature. Thermo acoustic parameters like Isentropic compressibility (κs),Acoustic impedance (Z), Free volume (Vf), Absorption coefficient (Abscoeff), Intermolecular free length (Lf), Gibb’s free energy (ΔG), Relaxation time (τ), Rao’s constant (Rm), Internal pressure (πi), Wada’s constant (w), and Entropy (H) for Tetrabutylammonium tetraphenylborate (Bu4NBPh4) and Tetrabuty lammonium perchlorate (Bu4NClO4) was calculated using experimental ultrasonic velocities, viscosities and densities at three different temperatures (298K, 308 K and 318K) and 1 atmospheric pressure in non-aqueous solvents like Dimethylsulfoxide (DMSO), Pyridine (Py) and their binary mixtures at 0, 20, 40, 60, 80 and 100 mol% of Py at variable temperatures ranging from 298K to 318K. Both Bu4NBPh4, Bu4NClO4, showed an increase in the ultrasonic velocity values at all the temperatures. This shows that molecular interactions are taking place in both the electrolytes. These increases in the molecular interactions with increase in the concentration of electrolytes in the solvent mixture were discussed in terms of solvent structural effects. And results showed the greater molecular interaction in DMSO rich regions.

scholarly journals Molecular Interactions of Piperidinium Based Ionic Liquids with Water/Alcohol at Different Temperatures

2020 ◽  
Vol 33 (1) ◽  
pp. 195-202
Author(s):  
G.V. Gangadhara Rao ◽  
Shaik Babu
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquids ◽  
Molar Volume ◽  
Molecular Interactions ◽  
Isentropic Compressibility ◽  
Acoustic Parameters ◽  
Fundamental Parameters ◽  
Different Temperatures ◽  
Excess Molar Isentropic Compressibility ◽  
Water Alcohol

In this experimental investigation, the thermodynamic fundamental parameters of density (ρ) and speed of sound(U) were calibrated for aqueous solution/alcoholic (1-propanol and 2-propanol) solutions of piperidinium based ionic liquids of 1-butyl-1-methylpiperidinium tetrafluoroborate (BMPiBF4) in various concentrations within temperatures from 303.15 to 313.15 K. From these experimental determined values, various thermodynamic acoustic parameters of excess molar isentropic compressibility (KE s,m), excess molar volume (VE m) are expressed in specific and non-specific molecular interactions. Moreover, calibration of the partial molar volume′s and partial isentropic compressibility′s of both components shows strong interaction in BMPiBF4 + 2-proponol combination than any other executed binary composites. In addition to this, the FTIR characteristic spectrum of all combinations at different concentrations gives the more promising features such as interaction behaviour that helps our analysis to guide the interactions of individual bonds.

scholarly journals Intermolecular Interaction of Aqueous Dextran with Urea

2019 ◽  
Vol 8 (11) ◽  
pp. 742-748
Keyword(s):  
Isentropic Compressibility ◽  
Structural Rearrangement ◽  
Urea Solution ◽  
Ultrasonic Speed ◽  
Acoustical Parameters ◽  
Intermolecular Free Length ◽  
Different Temperatures ◽  
Gibb’S Free Energy ◽  
Dextran Solution ◽  
Aqueous Dextran

In this paper, the authors have given information regarding intermolecular interactions of aqueous dextran solution in urea. The behavior of dextran in urea has been examined by the help of ultrasonic interferometer working at frequency 5MHz at different temperatures ranging from 303 K to 323 K in 5K interval. Ultrasonic speed, density, viscosity measurements have been used for the evaluation of thermodynamic parameters like Gibb’s free energy (ΔG) as well as acoustical parameters are acoustic impedance (Z), isentropic compressibility (β), intermolecular free length (Lf ) and relaxation time (τ), etc. The results have been used to throw light on the nature of the interaction among solute and solvent, interpreted in the light of structural rearrangement occurs in the aqueous dextran and urea solution.

scholarly journals Ultrasonic studies on temperature dependence of ion solvent interactions of ionic liquid 1-butyl-2,3- dimethylimidazolium chloride in aqueous solutions of tetra-n-butylammonium bromide at T = (298.15 to 313.15) K

2020 ◽  
Vol 10 (2) ◽  
pp. 5259-5265
Keyword(s):  
Aqueous Solutions ◽  
Isentropic Compressibility ◽  
Effect Of Temperature ◽  
Ammonium Bromide ◽  
Nonlinear Parameters ◽  
Solvent Interactions ◽  
Acoustical Properties ◽  
Wada’S Constant ◽  
Rao’S Constant ◽  
Different Temperatures

The densities (ρ), and ultrasonic velocities (u) of 1-Butyl-2, 3-dimethylimmidazolium chloride,[bdmim]Cl in aqueous solutions of Tetra-n-butyl ammonium bromide over the complete range of concentrations has been calculated at different temperatures T= (298.15 to 313)K. Experimentally obtained values of ρ and u were used to calculate the parameters like acoustic impedance (Z), isentropic compressibility (βS), molar sound velocity (Rao’s constant) (R), molar compressibility (Wada’s constant)(W), intermolecular free length (Lf), co-efficient of thermal expansion (α), heat capacity ratio (γ), isothermal compressibility (βT) and nonlinearity parameters (B/A). The final results obtained were analyzed to understand the ion-solvent and ion-ion interaction so taking place in the solutions. Further, the effect of temperature on the ion solvent interactions was discussed. Ion-solvent interactions are affected by the thermo acoustical properties and by nonlinear parameters.

scholarly journals Molecular Interaction Studies in Ternary Liquid Mixtures of Quinoline at Varying Temperatures

2008 ◽  
Vol 4 (2) ◽  
pp. 412-419
Author(s):  
Ch. Kavitha ◽  
Dr. A. Ratnakar ◽  
Dr. K. Narendra
Keyword(s):  
Experimental Data ◽  
Ultrasonic Velocity ◽  
Entire Range ◽  
Composition Range ◽  
Liquid Mixtures ◽  
Acoustic Parameters ◽  
Viscosity Deviation ◽  
Free Energy Of Activation ◽  
Excess Parameters ◽  
Gibb’S Free Energy

Density r, Viscosity η, and ultrasonic velocity u, have been measured in pure Quinoline, o-cresol, m-cresol, p-cresol and methanol and in their ternary liquid mixtures with quinoline and methanol as common components at 303.15, 308.15, 313.15 and 318.15K over the entire range of composition. From these experimental data, various thermo-acoustic parameters such as excess molar volume VmE, excess ultrasonic velocity uE, viscosity deviation Δη and excess Gibb’s free energy of activation for viscous flow ΔG*E have been calculated. The deviation/excess parameters were plotted against the mole fraction of quinoline over the whole composition range. The observed negative and positive values of deviaiton/excess thermo-acoustic parameters were explained on the basis of intermolecular interactions present in these mixtures.

Molecular Interaction Studies in Ternary Liquid Mixtures of Quinoline at Varying Temperatures

2013 ◽  
Vol 12 (7) ◽  
pp. 412-419
Author(s):  
Ch. Kavitha ◽  
Dr. A. Ratnakar ◽  
Dr. K. Narendra
Keyword(s):  
Experimental Data ◽  
Ultrasonic Velocity ◽  
Entire Range ◽  
Composition Range ◽  
Liquid Mixtures ◽  
Acoustic Parameters ◽  
Viscosity Deviation ◽  
Free Energy Of Activation ◽  
Excess Parameters ◽  
Gibb’S Free Energy

Density r, Viscosity η, and ultrasonic velocity u, have been measured in pure Quinoline, o-cresol, m-cresol, p-cresol and methanol and in their ternary liquid mixtures with quinoline and methanol as common components at 303.15, 308.15, 313.15 and 318.15K over the entire range of composition. From these experimental data, various thermo-acoustic parameters such as excess molar volume VmE, excess ultrasonic velocity uE, viscosity deviation Δη and excess Gibb’s free energy of activation for viscous flow ΔG*E have been calculated. The deviation/excess parameters were plotted against the mole fraction of quinoline over the whole composition range. The observed negative and positive values of deviaiton/excess thermo-acoustic parameters were explained on the basis of intermolecular interactions present in these mixtures.

scholarly journals Acoustical Studies of Binary Liquid Mixtures of p-Chlorotoluene in Benzene at Different Temperatures

2014 ◽  
Vol 29 ◽  
pp. 25-37 ◽  
Author(s):  
G. Pavan Kumar ◽  
Ch. Praveen Babu ◽  
K. Samatha ◽  
A.N. Jyosthna ◽  
K. Showrilu
Keyword(s):  
Molecular Interactions ◽  
Molecular Interaction ◽  
Adiabatic Compressibility ◽  
Liquid Mixtures ◽  
Ultrasonic Velocities ◽  
Acoustical Parameters ◽  
Binary Liquid ◽  
Wada’S Constant ◽  
Rao’S Constant ◽  
Different Temperatures

Ultrasonic velocities (U), densities (ρ), and coefficient of viscosities (η) are measured for binary mixtures containing (i) p-chlorotoluene and (ii) benzene at 303.15 K, 308.15 K, 313.15 K and 318.15 K to understand the molecular interaction. Various acoustical parameters such as adiabatic compressibility (βad), free length (Lf), acoustic impedance (Z), free volume (Vf), molar volume (Vm), Rao’s constant (R), Wada’s constant (W) and internal pressure (πi), are calculated from the measured values of U, ρ, and η. The trend in acoustical parameters also substantiates to asses strong molecular interactions.

scholarly journals Acoustical Investigation of N–(2-hydroxybenzylidene)-3-Substituted Pyridine -2- Amine Schiff bases by Ultrasonic Velocity Measurements in Dioxane at Different Temperatures

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Mrunal M. Mahajan ◽  
Pravin B. Raghuwanshi
Keyword(s):  
Schiff Bases ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Water Molecules ◽  
Water Medium ◽  
Velocity Measurements ◽  
Acoustic Parameters ◽  
Intermolecular Free Length ◽  
Different Temperatures ◽  
Solvent Molecules

<div><p><em>The present work deals with the study of acoustic parameters like ultrasonic velocity (V), </em><em>adiabatic compressibility (β<sub>s</sub>), apparent molar volume (</em><em>f</em><em><sub>v</sub></em><em>) and intermolecular free length (L<sub>f</sub>) by ultrasonic </em><em>interferometric measurements</em><em> which reflects structural interaction of water molecules and organic solvent molecules with substituted Schiff bases. The study of N–(2-hydroxybenzylidene)-3-substituted pyridine -2- amine Schiff bases were carried in different percentage of 1,4-dioxane-water medium, at 293, 297 and 300 K. The densities and velocities thus obtained were used to evaluate acoustic parameters for all the ligands.</em></p></div>

scholarly journals Acoustic Properties of Resonant Spruce Wood Modified Using Oil-Heat Treatment (OHT)

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1962
Author(s):  
Przemysław Mania ◽  
Mateusz Gąsiorek
Keyword(s):  
Heat Treatment ◽  
Modulus Of Elasticity ◽  
Acoustic Properties ◽  
Bending Test ◽  
Acoustic Parameters ◽  
Static Modulus ◽  
Spruce Wood ◽  
Before And After ◽  
Different Temperatures ◽  
The Mean

Wedge-shaped boards of spruce wood (Picea abies Karst.) are used to make violin fronts, also known as soundboards. Oil-heat treatment (OHT) can influence the acoustic properties of resonant wood, such as spruce. In this study, the effect of OHT on spruce wood was evaluated, using palm oil as a heating medium, at four different temperatures: 140, 160, 180 and 200 °C. Physical, mechanical and acoustic properties of spruce wood were evaluated before and after OHT and included the following: density, modulus of elasticity in the static bending test, and wood sound velocity. The acoustic parameters after OHT improved; however, the samples bent after modification had a higher modulus of elasticity, with a simultaneous deterioration of the acoustic parameters. The dynamic modulus of elasticity increased by 11%, and the musical constant by 5%. The static modulus increased by more than 3.5%, but the acoustic parameters calculated on the basis of these results indicated a deterioration of the acoustic properties of completely oven-dried wood. The increase in moisture content to air-dried condition contributed to a slight increase in the mean musical constant at the highest modification temperature.

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