Experimental evidence of the validity of Bahe–Varela theory to describe the volumetric properties of ionic liquids

Rilo, Esther; Domı́nguez-Pérez, Montserrat; Varela, Luis M.; Cabeza, O.

doi:10.1016/j.jct.2012.03.012

Cited by 4 publications

(4 citation statements)

References 35 publications

(54 reference statements)

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“…Moreover, numerous fundamental studies have investigated [EMIm][EtSO 4 ] and its mixtures with other substances. Most of these efforts focused on the aqueous and alcoholic solutions, see for example References , and the mixtures with organic solvents, polymers, and gases . Even a few studies of the RTIL inside nano‐porous and meso‐porous materials were reported …”

Section: Introductionmentioning

confidence: 99%

Time‐resolved femtosecond CARS of the ionic liquid 1‐ethyl‐3‐methylimidazolium ethylsulfate

Kiefer

Namboodiri

Kazemi

et al. 2015

J Raman Spectroscopy

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The ultrafast vibrational dynamics of the room-temperature ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate, [EMIm][EtSO 4 ] are studied using time-resolved femtosecond coherent anti-Stokes Raman scattering spectroscopy. Raman coherences are excited around 1040 and 1400 cm À1 , the vibrational dephasing of the modes in the fingerprint region is monitored as a function of time.The results indicate that beating pairs of Raman modes typically correspond to either the cation or the anion. The assignment of mixed mode pairs is not unambiguous and, moreover, the beating patterns of such possible mixed pairs are very weak. Interestingly, no evidence for interionic vibrational energy transfer is found despite the fact that the interactions in the ion pair are characterized by strong hydrogen bonds.

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Section: Introductionmentioning

confidence: 99%

Time‐resolved femtosecond CARS of the ionic liquid 1‐ethyl‐3‐methylimidazolium ethylsulfate

Kiefer

Namboodiri

Kazemi

et al. 2015

J Raman Spectroscopy

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“…This theoretical model has also been chosen because of its physical meaning, in contrast to the Redlich−Kister model, which is an empirical correlation. Equation 15 was used to determine the V 1 ∞ values by Bahe−Varela 60 as…”

Section: Resultsmentioning

confidence: 99%

“…For comparison purposes, the partial molar volumes of the IL at infinite dilution, V 1 ∞ , have been also calculated with the Bahe–Varela model, , and the results are shown in Table S23 of the Supporting Information. This theoretical model has also been chosen because of its physical meaning, in contrast to the Redlich–Kister model, which is an empirical correlation.…”

Section: Results and Discussionmentioning

confidence: 99%

“…This theoretical model has also been chosen because of its physical meaning, in contrast to the Redlich–Kister model, which is an empirical correlation. Equation was used to determine the V 1 ∞ values by Bahe–Varela as where C is the IL concentration in mol/dm 3 and parameters α, β, and γ are expressed by the following equation where R is the perfect gas constant, P is the pressure, T is the absolute temperature, χ is the isothermal compressibility of the solution, and a may be calculated for a salt by where A′′ is the Madelung-like constant, z + and z – are, respectively, cation and anion charges ( ν = ν + + ν – ), N is Avogradro’s number, ε is the dielectric constant, and a A ″ is a factor for converting a given structure into the distance separating the ions. The literal expression of parameter b involves variables specific to the system, for example, the volume of the region around each ion in which the dielectric constant varies from ε to ε o . Parameter c depends on the characteristics of the mixture components. The values of coefficients b and c may be obtained experimentally and thus serve as adjustable parameters.…”

Section: Results and Discussionmentioning

confidence: 99%

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Density, Refractive Index and Volumetric Properties of Water–Ionic Liquid Binary Systems with Imidazolium-Based Cations and Tetrafluoroborate, Triflate and Octylsulfate Anions at T = 293 to 343 K and p = 0.1 MPa

Carissimi¹,

Montalbán

Baños³

et al. 2019

J. Chem. Eng. Data

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The density and refractive index of ionic liquids (ILs) + water binary mixtures were determined as a function of temperature (from 293.15 to 343.15 K) at atmospheric pressure over the whole composition range in which the mixtures were miscible. To carry out a systematic study, all of the ILs selected are imidazolium-based ILs with a different number of carbons in the alkyl chain of the cation and also different anions (tetrafluoroborate, triflate, and octylsulfate). Specifically, the studied ILs were 1-ethyl-3-methylimidazolium tetrafluoroborate [emim][BF4], 1-butyl-3-methylimidazolium tetrafluoroborate [bmim][BF4], 1-hexyl-3-methylimidazolium tetrafluoroborate [hmim][BF4], 1-methyl-3-octylimidazolium tetrafluoroborate [omim][BF4], 1-ethyl-3-methylimidazolium triflate [emim][TfO], 1-butyl-3-methylimidazolium triflate [bmim][TfO], and 1-butyl-3-methylimidazolium octylsulfate [bmim][OcSO4]. The excess molar volumes and the deviation in the molar refraction of the binary mixtures were calculated for a better understanding of the interactions that take place between the components and were successfully correlated by the Redlich–Kister empirical correlations. The Bahe–Varela model, which has a more physical meaning, was also used to successfully correlate the excess molar volume values. Volumetric properties, such as apparent molar volumes, partial molar volumes, isobaric thermal expansion coefficients, partial molar volumes at infinite dilution and excess partial molar volumes at infinite dilution were also calculated in order to obtain information about the influence of composition and temperature on the thermodynamic behavior of the selected ILs and water in the mixture. The results are discussed in order to understand the formation of hydrogen bonds between components of the mixture and the possible packing effects that take place in the mixing process. The density and refractive index experimental data were correlated by the Lorentz–Lorenz, Wiener, Dale–Gladstone, and Eykman equations to determine the relationship between both parameters, and good agreement between the experimental and calculated refractive index values was obtained.

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New mathematical modeling of temperature-based properties of ionic liquids mixture: Comparison between semi-empirical equation and equation of state

Mokhtari

Bagheri

Ghazvini

et al. 2022

Chemical Engineering Research and Design

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Experimental evidence of the validity of Bahe–Varela theory to describe the volumetric properties of ionic liquids

Cited by 4 publications

References 35 publications

Time‐resolved femtosecond CARS of the ionic liquid 1‐ethyl‐3‐methylimidazolium ethylsulfate

Time‐resolved femtosecond CARS of the ionic liquid 1‐ethyl‐3‐methylimidazolium ethylsulfate

Density, Refractive Index and Volumetric Properties of Water–Ionic Liquid Binary Systems with Imidazolium-Based Cations and Tetrafluoroborate, Triflate and Octylsulfate Anions at T = 293 to 343 K and p = 0.1 MPa

New mathematical modeling of temperature-based properties of ionic liquids mixture: Comparison between semi-empirical equation and equation of state

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