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. 2024 Apr 22;9(17):19363-19377.
doi: 10.1021/acsomega.4c00520. eCollection 2024 Apr 30.

Estimation of Ultrasonic Velocity, Density, Internal Pressure, and Thermophysical Parameters of Ionic Liquid Mixtures: Application of Flory's Statistical Theory

Archana Sirohi  1 , Arun Upmanyu  1 , Pankaj Kumar  1 , Monika Dhiman  1 , Kailash Chandra Juglan  2 , Devinder Pal Singh  3 , Kuldeep K Saxena  4 , Alok Bhadauria  5 , Md Irfanul Haque Siddiqui  6
Affiliations

Estimation of Ultrasonic Velocity, Density, Internal Pressure, and Thermophysical Parameters of Ionic Liquid Mixtures: Application of Flory's Statistical Theory

Archana Sirohi et al. ACS Omega. .

Abstract

Flory's statistical theory (FST) has been employed to estimate the ultrasonic velocity, density, internal pressure, and several important thermophysical parameters such as the energy of vaporization, the heat of vaporization, cohesive energy density, polarity index, and solubility for eight binary mixtures of ionic liquids and water within the temperature range of 288.15 to 308.15 K. The ionic liquids chosen for this investigation are [BMim][dca], [BMim][TfO], [BMpy][TfO], [BMpyr][dca], [BMpyr][TfO], [EEPy][ESO4], [HMim][dca], and [MPy][MSO4]. The predicted values of ultrasonic velocity and density show good agreement with the data reported in the literature. It endorses the applicability of FST to these binary mixtures. A comparative analysis of the internal pressure values (Pi) determined by using FST and the standard thermodynamic approach is also presented. The results obtained for Pi using both approaches show good agreement. Besides, for the mixtures under study, the correlation between ultrasonic velocity, density, and surface tension has also been examined. The variation of thermophysical parameters with concentration and temperature changes has been utilized to explore the nature and strength of the solute-solvent interactions prevalent in these mixtures. It is pointed out that A-A-type interactions dominate over A-B-type interactions in water-rich regions of the mixtures.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Comparison of ultrasonic velocity estimated using the Auerbach relation (UA), Alternberg relation (UAR), Singh–Pandey–Sanguri relation (USP), and modified Auerbach relation (UMA) along with the literature values (U*) for binary mixtures. Solid line is a guide for eye.
Figure 1
Figure 1
Comparison of ultrasonic velocity estimated using the Auerbach relation (UA), Alternberg relation (UAR), Singh–Pandey–Sanguri relation (USP), and modified Auerbach relation (UMA) along with the literature values (U*) for binary mixtures. Solid line is a guide for eye.
Figure 2
Figure 2
Ratio of internal pressure ratio (PFST/Pi) obtained using the thermodynamic method and the FST method. Solid line is a guide for eye.
See this image and copyright information in PMC

References

    1. Rebelo L. P. N.; Canongia Lopes J. N.; Esperança J. M. S. S.; Filipe E. On the critical temperature, normal boiling point, and vapor pressure of ionic liquids. J. Phys. Chem. B 2005, 109, 6040–6043. 10.1021/jp050430h. - DOI - PubMed
    1. Earle M. J.; Esperança J. M.; Gilea M. A.; Canongia Lopes J. N.; Rebelo L. P. N.; Magee J. W.; Seddon K. R.; Widegren J. A. The distillation and volatility of ionic liquids. Nature. 2006, 439, 831–834. 10.1038/nature04451. - DOI - PubMed
    1. Alvarez V. H.; Mattedi S.; Martin-Pastor M.; Aznar M.; Iglesias M. Thermophysical properties of binary mixtures of {ionic liquid 2-hydroxy ethylammonium acetate + (water, methanol, or ethanol)}. J. Chem. Thermodyn. 2011, 43, 997–1010. 10.1016/j.jct.2011.01.014. - DOI
    1. Musale S. P.; Patil K. R.; Gavhane R. J.; Dagade D. H. Density and speed-of-sound measurements for dilute binary mixtures of diethylammonium-based protic ionic liquids with water. J. Chem. Eng. Data 2018, 63, 1859–1876. 10.1021/acs.jced.7b00909. - DOI
    1. Paduszynski K.; Domanska U. A new group contribution method for prediction of density of pure ionic liquids over a wide range of temperature and pressure. Ind. Eng. Chem. Res. 2012, 51, 591–604. 10.1021/ie202134z. - DOI

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