Journal of Pure and Applied Ultrasonics

R. Palani ¹, S. Kalavathy ²

Affiliations
1 Department of Physics, D.D.E., Annamalai University, Annamalainagar-608002, IN
2 Department of Physics, Sri Chandrasekarendra Saraswathi Viswa Mahavidyalaya, Enathur, Kanchipuram-631561, IN

Abstract

Ultrasonic velocity (U), density (ρ) and viscosity (η) for the ternary liquid mixtures of benzaldehyde+tetrachloromethane+o-cresol, benzaldehyde+tetrachloromethane+m-cresol and benzaldehyde+tetrachloromethane+p-cresol have been measured as a function of the composition at 303, 308 and 313K. The experimental data have been used to calculate some excess acoustical parameters, such as adiabatic compressibility (β^E), free length (L_f^E) and free volume (V_f^E). The results are discussed and interpretered in terms of specific interaction predominated by hydrogen bonding.

Keywords

Ultrasonic Velocity, Adiabatic Compressibility, Free Length (L_f^E), Free Volume (V_f^E), Hydrogen Bonding.

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R. Palani ¹, S. Balakrishnan ²

Affiliations
1 Department of Physics, D.D.E, Annamalai University, Annamalainagar-608002, Tamil Nadu, IN
2 Department of Physics, Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya, Enathur, Kanchipuram, Tamil Nadu, IN

Abstract

Apparent molal compressibilities (φ_K) and apparent molal volumes (φ_V), of L-serine, L-arginine and Lphenylalanine in aqueous sodium hydroxide solutions (0.0-0.10 mol kg^–1) at 303.15 K have been determined from precise density and ultrasonic velocity measurements. Limiting apparent molal compressibilities (φ_K^O), limiting apparent molal volumes (φ_V^O) and their constants (S_K,S_V) of these amino acids at infinite dilution were evaluated. Transfer adiabatic compressibilities (Δφ_K^O) and transfer volumes (Δφ_V^O) at infinite dilution from water to aqueous sodium hydroxide solutions have been calculated. These derived parameters have been interpreted in terms of ion-solvent and ion-ion interactions in the studied solutions.

Keywords

Ultrasonic Velocity, Apparent Molal Compressibility, Apparent Molal Volume and Transfer Volume.

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A. N. Kannappan ¹, R. Palani ¹

Affiliations
1 Department of Physics, Annamalai University, Annamalainagar-608002, IN

Abstract

Ultrasonic velocity, density and attenuation measurements in V₂O₅-P₂O₅, V₂O₅-ZnO-P₂O₅ and V₂O₅-MnO-P₂O₅ composition glasses have been made at the room temperature by making use of pulse echo method. These values are utilised to evaluate elastic moduli such as longitudinal, Young's, bulk and shear, Poisson's ratio, acoustic impedance, micro hardness, internal friction, Debye temperature and thermal expansion coefficient. The structural and physical properties of the glass samples have been discussed in the light of the above parameters.

Keywords

Ultrasonic Velocity, Elastic Moduli, Poisson’s Ratio, Micro-Hardness, Debye Temperature.

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R. Palani ¹, G. Srinivasan ²

Affiliations
1 Department of Physics, D.D.E, Annamalai University, Annamalainagar-608002, Tamil Nadu, IN
2 Department of Physics, Annamalai University, Annamalainagar-608002, Tamil Nadu, IN

Abstract

The ultrasonic wave velocity (longitudinal and shear), density and attenuation for the ternary glass systems of Li₂O-B₂O₃-BaO and Li₂O-B₂O₃-MnO have been measured at the room temperature by using pulse-echo technique at 5 MHz. The samples were prepared by melt-quenching method. The amorphous nature of the samples was ascertained using X-ray diffractometry (XRD). The measured experimental values are utilized to evaluate elastic moduli, Poisson's ratio, acoustic impedance, internal friction, microhardness, Debye temperature and thermal expansion coefficient. Trends of the co-ordination number, cross-link density, mechanical and thermal stability for the systems are discussed in terms of the structural changes taking place due to variations in composition.

Keywords

Ultrasonic Velocity, Elastic Moduli, XRD, Poisson's Ratio, Debye Temperature.

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