Journal of Pure and Applied Ultrasonics

N. K. Soni ¹, K. K. Tiwari ¹, D. K. Dwivedi ², Vikash Singh ³, V. K. Singh ³, A. K. Shukla ⁴

Affiliations
1 Department of Chemistry, University of Allahabad, Allahabad, 211 002, IN
2 Electronics Department, Ewing Christian College, Allahabad, IN
3 Rashtriya Post Graduate College, Jamuhai, Jaunpur-222001, Uttar Pradesh, IN
4 Department of Chemistry, S.P. Mukherjee Government Degree College, Allahabad, IN

Abstract

Various thermodynamic properties viz. acoustic impedance, Z, intermolecular free length, Lr molar sound velocity, R, molar compressibility, W, and molecular association M_A, have been computed for five binary liquid mixtures (Dimethylcarbonate (DMC) + methanol, DMC + cyclohexane, methanol + cyclohexane, DMC + benzene, and methanol + benzene) at 298.15 K. Interactions between the components of binary systems are studied in terms of excess acoustic impedance, Z^E, excess intermolecular free length, L_f^E deviation in molar sound velocity, ΔR, deviation in molar compressibility, ΔW, and deviation in ultrasonic velocity, Δu. Sign and magnitude of the excess properties give an estimate of strength of the unlike interactions in a iquid mixture. Small positive values of L_f^E and negative values of Z^E and Δu signify the existence of weak interactions between component molecules of all the binary systems. Moreover, an attempt has also been made to examine the validity of several theories and relations, viz. free length theory, Nomoto relation, Junjie relation, Van Deal & Vangeel ideal mixing relation and collision factor theory for the theoretical predictions of ultrasonic velocity in the systems under consideration.

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J. D. Pandey ¹, Ranjan Dey ¹, N. K. Soni ¹, R. K. Mishra ¹, D. K. Dwivedi ²

Affiliations
1 Department of Chemistry, University of Allahabad, Allahabad-211002, IN
2 Department of Electronics, E.C.C., Allahabad, IN

Abstract

Flory's statistical theory has been extended for the computation of internal pressure, isentropic compressibility, isothermal compressibility and Pseudo Gruneisen parameter of binary mixture nitrobenzene+benzene at pressure up to 10 MPa and at two different temperatures (293.15K, 303.15K & 313.15K). For a comparative study of the isothermal compressibility of this system, equation of state based on the psuedo spinodal hypothesis developed by Baonza et al has also been utilized to deduce the isothermal compressibility of this mixture. The computed values of P_int, β_T, β_s and Γ have been compared with the experimental findings available in literature. Satisfactory agreement has been found between experimental and theoretical values.

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