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Densities and Excess, Apparent, and Partial Molar Volumes of Binary Mixtures of BMIMBF4 + Ethanol as a Function of Temperature, Pressure, and Concentration

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Abstract

The densities of five BMIMBF4 (1-butyl-3-methylimidazolium tetrafluoroborate) + ethanol binary mixtures with compositions of (0.0701, 0.3147, 0.5384, 0.7452, and 0.9152) mole fraction BMIMBF4 and of pure BMIMBF4 have been measured with a vibrating-tube densimeter. Measurements were performed at temperatures from 298 K to 398 K and at pressures up to 40 MPa. The total uncertainty of density, temperature, pressure, and concentration measurements were estimated to be less than 0.1 kg · m−3, 15 mK, 5 kPa, and 10−4, respectively. The uncertainties reported in this article are expanded uncertainties at the 95% confidence level with a coverage factor of k = 2. The measured densities were used to study derived volumetric properties such as excess, apparent, and partial molar volumes. It is shown that the values of excess molar volume for BMIMBF4 + ethanol mixtures are negative at all measured temperatures and pressures over the whole concentration range. The effect of water content on the measured values of density is discussed. The volumetric (excess, apparent, and partial molar volumes) and structural (direct and total correlation integrals, cluster size) properties of dilute BMIMBF4 + ethanol mixtures were studied in terms of the Krichevskii parameter. The measured densities were used to develop a Tait-type equation of state.

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Author notes

  1. I. M. Abdulagatov

    Present address: Physical and Chemical Properties Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado, 80305, USA

Authors and Affiliations

  1. Erciyes University, 38039, Kayseri, Turkey

    A. Tekin

  2. Azerbaijan Technical University, H. Javid Avenue 25, AZ1073, Baku, Azerbaijan

    J. Safarov & A. Shahverdiyev

  3. Lehrstuhl für Technische Thermodynamik, Universität Rostock, 18059, Rostock, Germany

    J. Safarov & E. Hassel

Authors
  1. I. M. Abdulagatov
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  2. A. Tekin
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  3. J. Safarov
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  4. A. Shahverdiyev
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  5. E. Hassel
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Correspondence to I. M. Abdulagatov.

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Abdulagatov, I.M., Tekin, A., Safarov, J. et al. Densities and Excess, Apparent, and Partial Molar Volumes of Binary Mixtures of BMIMBF4 + Ethanol as a Function of Temperature, Pressure, and Concentration. Int J Thermophys 29, 505–533 (2008). https://doi.org/10.1007/s10765-008-0410-4

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  • DOI: https://doi.org/10.1007/s10765-008-0410-4

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