On the scaling behavior of electric conductivity in [C<sub>4</sub>mim][NTf<sub>2</sub>]

Wojnarowska, Ż.; Jarosz, G.; Grzybowski, Adam; Pionteck, Jürgen; Jacquemin, Johan; Paluch, Marian

doi:10.1039/c4cp02253j

Cited by 28 publications

(35 citation statements)

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“…4,8,29,40 14,15,29,17,214 Additionally, pρT data of [C4C1im][NTf2], 218 [C6C1im][NTf2], 207 The pressure dependencies of the density and heat capacity, isentropic compressibility, the isothermal compressibility, isobaric expansibility, isochoric thermal-pressure coefficient, isochoric heat capacity are calculated by acoustic method using the well-known thermodynamic relationships. 8,14,15,29 214 are in a very good agreement with data obtained by high pressure densimeter 14,17,207,218,286 , while a bad agreement with the high-pressure specific volumes obtained using dilatometer 287 17 and with excellent agreement with calculated by the acoustic method by Gomes de Azevedo et al 14 (the maximum deviation is 0.0013 GPa -1 at 10 MPa and 303.15 K). Herein, a statistical analysis is presented in Table 5.…”

Section: Calculation Of Volumetric Properties and Thermodynamic Formasupporting

confidence: 75%

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Speed of Sound and Ultrasound Absorption in Ionic Liquids

et al. 2017

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A complete review of the literature data on the speed of sound and ultrasound absorption in pure ionic liquids (ILs) is presented. Apart of the analysis of data published to date, the significance of the speed of sound in ILs is regarded. An analysis of experimental methods described in the literature to determine the speed of sound in ILs as a function of temperature and pressure is reported, and the relevance of ultrasound absorption in acoustic investigations is discussed. Careful attention was paid to highlight possible artifacts, and side phenomena related to the absorption and relaxation present in such measurements. Then, an overview of existing data is depicted to describe the temperature and pressure dependences on the speed of sound in ILs, as well as the impact of impurities in ILs on this property. A relation between ions structure and speeds of sound is presented by highlighting existing correlation and evaluative methods described in the literature. Importantly, a critical analysis of speeds of sound in ILs vs those in classical molecular solvents is presented to compare these two classes of compounds. The last part presents the importance of acoustic investigations for chemical engineering design and possible industrial applications of ILs.

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Section: Calculation Of Volumetric Properties and Thermodynamic Formasupporting

confidence: 75%

“…where N is the number of points of the data set considered. y1 -data reported by Dzida et al 214 , y2 -data reported by b Esperança et al 17 , c Gomes de Azevedo et al 14 , d Hamidova et al 218 , e Currás et al 286 , f Wojnarowska et al 287 and g Safarov et al 207…”

Section: Calculation Of Volumetric Properties and Thermodynamic Formamentioning

confidence: 94%

Speed of Sound and Ultrasound Absorption in Ionic Liquids

et al. 2017

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“…(9) in Ref. 35) with the values of its fitting parameters earlier reported for PVAc, 35 BMPC, 36 KDE,37 BmimNTf2, 38 TEAC, 27 and determined herein 39 for TBAC. The total system entropy S has been calculated from the well-known thermodynamic formula,…”

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confidence: 73%

Role of entropy in the thermodynamic evolution of the time scale of molecular dynamics near the glass transition

et al. 2015

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In this paper, we investigate how changes in the system entropy influence the characteristic time scale of the system molecular dynamics near the glass transition. Independently of any model of thermodynamic evolution of the time scale, against some previous suppositions, we show that the system entropy S is not sufficient to govern the time scale defined by structural relaxation time τ. In the density scaling regime, we argue that the decoupling between τ and S is a consequence of different values of the scaling exponents γ and γ(S) in the density scaling laws, τ=f(ρ(γ)/T) and S=h(ρ(γ(S))/T), where ρ and T denote density and temperature, respectively. It implies that the proper relation between τ and S requires supplementing with a density factor, u(ρ), i.e., τ=g(u(ρ)w(S)). This meaningful finding additionally demonstrates that the density scaling idea can be successfully used to separate physically relevant contributions to the time scale of molecular dynamics near the glass transition. The relation reported by us between τ and S constitutes a general pattern based on nonconfigurational quantities for describing the thermodynamic evolution of the characteristic time scale of molecular dynamics near the glass transition in the density scaling regime, which is a promising alternative to the approaches based as the Adam-Gibbs model on the configurational entropy that is difficult to evaluate in the entire thermodynamic space. As an example, we revise the Avramov entropic model of the dependence τ(T,ρ), giving evidence that its entropic basis has to be extended by the density dependence of the maximal energy barrier for structural relaxation. We also discuss the excess entropy S(ex), the density scaling of which is found to mimic the density scaling of the total system entropy S.

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“…As a result, the difference in transport properties between PILs and AILs can be suitably resolved. 32 at ambient and elevated pressure (up to 600 MPa) using dielectric spectroscopy. This technique probes molecular fluctuations and measures the dielectric/electrical response over many orders of magnitude in frequency and in a wide temperature and pressure interval, proving to be the ideal experimental tool for this quest.…”

Section: Introductionmentioning

confidence: 99%

How is charge transport different in ionic liquids? The effect of high pressure

Wojnarowska

Thoms

Blanchard

et al. 2017

Phys. Chem. Chem. Phys.

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Modern ionic liquids (ILs) are considered green solvents for the future applications due to their inherited advantages and remarkable transport properties. One of the ubiquitous properties of ILs is their intrinsic ionic conductivity. However, understanding of the super-Arrhenius behavior of the ionic conductivity process at elevated pressure still remains elusive and crucial in glass science. In this work, we investigate the ion transport properties of 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide: [Cmim][NTf], 1-butylimidazolium bis[(trifluoromethyl)-sulfonyl]imide: [CHim][NTf] and 1-butylimidazolium hydrogen sulfate: [CHim][HSO] ILs in the supercooled liquid state using dielectric spectroscopy at ambient and high pressure. We present the experimental data in the dynamic window of the conductivity formalism to examine the charge transport properties. The frequency-dependent ionic conductivity data have been analyzed using the time-temperature superposition principle. In the Arrhenius diagram, the thermal evolution of the dc-conductivity reveals similar temperature dependence for both protic and aprotic ILs thus making it difficult to distinguish the ion dynamics. However, our results demonstrate the key role of high pressure that unambiguously separates the charge transport properties of protic ILs from aprotic ones through the apparent activation volume parameter. We also highlight that the activation volume can be employed to assess the information connecting the ability of ionic systems to form H-bond networks and the impact of proton transfer involved in the conduction process.

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On the scaling behavior of electric conductivity in [C₄mim][NTf₂]

Cited by 28 publications

References 50 publications

Speed of Sound and Ultrasound Absorption in Ionic Liquids

Speed of Sound and Ultrasound Absorption in Ionic Liquids

Role of entropy in the thermodynamic evolution of the time scale of molecular dynamics near the glass transition

How is charge transport different in ionic liquids? The effect of high pressure

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On the scaling behavior of electric conductivity in [C4mim][NTf2]

Cited by 28 publications

References 50 publications

Speed of Sound and Ultrasound Absorption in Ionic Liquids

Speed of Sound and Ultrasound Absorption in Ionic Liquids

Role of entropy in the thermodynamic evolution of the time scale of molecular dynamics near the glass transition

How is charge transport different in ionic liquids? The effect of high pressure

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Product

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On the scaling behavior of electric conductivity in [C₄mim][NTf₂]