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Excess parameters for binary mixtures of alkyl benzoates with 2-propanol at different temperatures

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Abstract

Density (ρ), viscosity (η), and speed of sound (U) values for the binary mixture systems of methyl benzoate + 2-propanol and ethyl benzoate + 2-propanol including those of pure liquids were measured over the entire mole fraction range at five different temperatures (303.15, 308.15, 313.15, 318.15, and 323.15) K. From these experimentally determined values, various thermo-acoustic parameters such as excess isentropic compressibility \( \left( {K_{\text{s}}^{\text{E}} } \right) \), excess molar volume (V E) and excess free length \( \left( {L_{\text{f}}^{\text{E}} } \right) \), excess Gibb’s free energy (ΔG *E), and excess enthalpy (H E) have been calculated. The excess functions have been fitted to the Redlich–Kister type polynomial equation. The deviations for excess thermo-acoustic parameters have been explained on the basis of the intermolecular interactions present in these binary mixtures. The theoretical values of speed of sound in the mixtures have been evaluated using various theories and have been compared with experimentally determined speed of sound values in order to check the applicability of such theories to the liquid mixture systems under study. Viscosity data have been used to test the applicability of standard viscosity models of Grunberg–Nissan, Hind–Mc Laughlin, Katti–Chaudhary, Heric and Brewer, Frenkel, Tamura and Kurata at various temperatures for the binary liquid systems under study.

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Acknowledgements

The authors gratefully acknowledge the Project No.: ERIP/ER/0703688/M/01/1134, dated 31-03-2010 of DRDO and UGC DRS LEVEL III program No. F.530/1/DRS/2009 (SAP-I), dated 09-02-2009 New Delhi, to the department of Physics, ANU for providing financial assistance.

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Authors and Affiliations

  1. Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur, 522 510, India

    S. Sreehari Sastry & Shaik Babu

  2. Department of Engineering Physics, Gitam University, HYDERABAD CAMPUS, Hyderabad, 502 329, India

    T. Vishwam

  3. Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900, Kampar, Perak, Malaysia

    Ha Sie Tiong

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  1. S. Sreehari Sastry
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Correspondence to S. Sreehari Sastry.

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Sastry, S.S., Babu, S., Vishwam, T. et al. Excess parameters for binary mixtures of alkyl benzoates with 2-propanol at different temperatures. J Therm Anal Calorim 116, 923–935 (2014). https://doi.org/10.1007/s10973-013-3570-9

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