Communication: Inflection in the pressure dependent conductivity of the protic ionic liquid C8HIM NTf2

Thoms, Erik; Wojnarowska, Ż.; Goodrich, Peter; Jacquemin, Johan; Paluch, Marian

doi:10.1063/1.4982941

Cited by 10 publications

(16 citation statements)

References 17 publications

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“…This is the first time an inflection in the pressure dependent Debye relaxation time was reported. These results are of high interest, since similar phenomena have been observed before in various dynamic properties and different materials [31][32][33][34][35] . Additionally, Lederle et al reported that an inflection in the temperature dependence of τ D at ambient pressure seems to be common behavior in simple MAs, and explained it with the reduction of supermolecular chain length upon heating 36 .…”

Section: Resultssupporting

confidence: 82%

Inflection point in the Debye relaxation time of 2-butyl-1-octanol

Thoms

Kołodziej

Wikarek

et al. 2018

The Journal of Chemical Physics

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We report a striking anomaly in the pressure dependent Debye-relaxation time of the branched monohydroxy alcohol 2-butyl-1-octanol. Evidence of a crossover from slower to faster than exponential pressure dependency was obtained at different temperatures via high pressure broadband dielectric spectroscopy. At the same time, viscosity measurements reveal similar behavior in the viscosity respectively the structural relaxation time, indicating a similar origin of the phenomena.

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Section: Resultssupporting

confidence: 82%

Inflection point in the Debye relaxation time of 2-butyl-1-octanol

Thoms

Kołodziej

Wikarek

et al. 2018

The Journal of Chemical Physics

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“…a transition from slower to faster than exponential pressure dependence in both properties. Similar observations were made before, both in PC and in other materials [25][26][27][28]. However, the presence of the inflection in the generated τ α isotherm is of special significance since no such feature can be observed in the reference isobar.…”

supporting

confidence: 86%

“…Fits of the viscosity data from Casalini and Bair according to eq result in p infl = p ( V act = min) ≈ 235 and 350 MPa for 298 and 328 K, respectively, in excellent agreement with our data. A linear p infl ( T ) dependence seems to be common behavior for materials without significant hydrogen bonding . A linear fit (line in Figure ) with a slope of 4.7 MPa/K adequately describes the data.…”

mentioning

confidence: 66%

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Breakdown of the Simple Arrhenius Law in the Normal Liquid State

Thoms

Grzybowski

Pawlus

et al. 2018

J. Phys. Chem. Lett.

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It is common practice to discuss the temperature effect on molecular dynamics of glass formers above the melting temperature in terms of the Arrhenius law. Using dielectric spectroscopy measurements of dc conductivity and structural relaxation time on the example of the typical glass former propylene carbonate, we provide experimental evidence that this practice is not justified. Our conclusions are supported by employing thermodynamic density scaling and the occurrence of inflection points in isothermal dynamic data measured at elevated pressure. Additionally, we propose a more suitable approach to describe the dynamics both above and below the inflection point based on a modified MYEGA model.

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“…Macroscopic transport properties in ionic liquids are typically investigated by dielectric spectroscopy, 9 − 11 conductivity experiments, 12 − 14 or rheology, 15 and based on these length scales, a close correlation between viscous flow and ion transport has been inferred. 16 , 17 On microscopic-length scales, dynamics has been studied by, e.g., nuclear magnetic resonance, 18 , 19 quasi-elastic neutron scattering (QENS), 20 − 28 and molecular dynamics simulations.…”

Section: Introductionmentioning

confidence: 99%

Pressure and Temperature Dependence of Local Structure and Dynamics in an Ionic Liquid

et al. 2021

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A detailed understanding of the local dynamics in ionic liquids remains an important aspect in the design of new ionic liquids as advanced functional fluids. Here, we use small-angle X-ray scattering and quasi-elastic neutron spectroscopy to investigate the local structure and dynamics in a model ionic liquid as a function of temperature and pressure, with a particular focus on state points ( P , T ) where the macroscopic dynamics, i.e., conductivity, is the same. Our results suggest that the initial step of ion transport is a confined diffusion process, on the nanosecond timescale, where the motion is restricted by a cage of nearest neighbors. This process is invariant considering timescale, geometry, and the participation ratio, at state points of constant conductivity, i.e., state points of isoconductivity. The connection to the nearest-neighbor structure is underlined by the invariance of the peak in the structure factor corresponding to nearest-neighbor correlations. At shorter timescales, picoseconds, two localized relaxation processes of the cation can be observed, which are not directly linked to ion transport. However, these processes also show invariance at isoconductivity. This points to that the overall energy landscape in ionic liquids responds in the same way to density changes and is mainly governed by the nearest-neighbor interactions.

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Communication: Inflection in the pressure dependent conductivity of the protic ionic liquid C8HIM NTf2

Abstract: Communication: Heterogeneous water dynamics on a clathrate hydrate lattice detected by multidimensional oxygen nuclear magnetic resonance

Cited by 10 publications

References 17 publications

Inflection point in the Debye relaxation time of 2-butyl-1-octanol

Inflection point in the Debye relaxation time of 2-butyl-1-octanol

Breakdown of the Simple Arrhenius Law in the Normal Liquid State

Pressure and Temperature Dependence of Local Structure and Dynamics in an Ionic Liquid

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