Densities, Refractive Indices, Viscosities, and Conductivities of Non-Imidazolium Ionic Liquids [Et3S][TFSI], [Et2MeS][TFSI], [BuPy][TFSI], [N8881][TFA], and [P14][DCA]

Nazet, Andreas; Sokolov, Sophia; Sonnleitner, Thomas; Friesen, Sergej; Buchner, Richard

doi:10.1021/acs.jced.7b00060

Cited by 26 publications

(16 citation statements)

References 74 publications

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“…This classifies reline and its aqueous mixtures down to x 1 = 0.093 as good ionic liquids. 74 The present data for κ(x 1 ) reveal a broad maximum at x 1 ≈ 0.18, which probably reflects the transition between charge transport by individual ions and the possibly collective motions in a solvent-lubricated molten salt. 70 The obtained excess molar volumes, V E , indicate somewhat enhanced packing in the mixtures.…”

Section: Discussionmentioning

confidence: 49%

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Densities, Viscosities, and Electrical Conductivities of Pure Anhydrous Reline and Its Mixtures with Water in the Temperature Range (293.15 to 338.15) K

Agieienko

Buchner

2019

J. Chem. Eng. Data

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Density (ρ), dynamic viscosity (η), and electrical conductivity (κ) of the deep eutectic solvent (DES) reline, composed of choline chloride (ChCl) and urea in a 1:2 molar ratio, and its mixtures with water, covering the entire miscibility range, were studied at T = (293.15 to 338.15) K. Compared to many previous studies, reline purity was significantly improved by using ultrapure urea and ChCl recrystallized from ethanol. For the investigated DES samples the mass fraction of residual water was <0.00035. This allowed checking the influence of water traces and impurities on the physicochemical properties of pure reline. It was found that the presence of small amounts of water (w(H 2 O) < 0.0081) only negligibly decreased reline density, not exceeding 0.14% compared to the dry sample. However, for the same amount of water η decreased by ∼36% at 298.15 K. The temperature dependence of ρ was well fitted by a quadratic expression, whereas η(T) and κ(T) were found to follow the empirical Vogel−Fulcher−Tammann equation. For the aqueous mixtures excess properties of molar volume (V E ) and viscosity (η E ) showed only minor variation with composition, suggesting rather weak interactions between water and the constituents of reline. However, V E and η E depended significantly on temperature, indicating a significant contribution of H-bonding to the inherent reline structure. Similar to conventional ionic liquids, the conductivity of aqueous reline showed a broad maximum at the reline mole fraction of x 1 ≈ 0.18 associated with the border between aqueous solutions of individual reline components and reline/water mixtures. The Walden plot classifies reline as a poor ionic liquid.

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Section: Discussionmentioning

confidence: 49%

“…The present Λ eq (φ) collapse on the reference line. This classifies reline and its aqueous mixtures down to x 1 = 0.093 as good ionic liquids …”

Section: Results and Discussionmentioning

confidence: 99%

Densities, Viscosities, and Electrical Conductivities of Pure Anhydrous Reline and Its Mixtures with Water in the Temperature Range (293.15 to 338.15) K

Agieienko

Buchner

2019

J. Chem. Eng. Data

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“…This value is the largest thermal response as a form of conductivity change for organic sensing materials so far as we know. As explained before, the thermal response of pure [OMIm]PF 6 , which follows Vogel-Tamman-Fucher equation 38,39 , is attributed to the increase of ionic mobility as a result of the reduced viscosity upon raising the temperature. The addition of [OMIm]AzoO crystal fibers can tailor a greater conductivity change because the number of conductive pathways and free ions is dramatically increased once the crystal fibers melt at high temperature.…”

Section: Resultsmentioning

confidence: 62%

Crystal-confined freestanding ionic liquids for reconfigurable and repairable electronics

Gao

Tao

et al. 2019

Nat Commun

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Liquid sensors composed of ionic liquids are rising as alternatives to solid semiconductors for flexible and self-healing electronics. However, the fluidic nature may give rise to leakage problems in cases of accidental damages. Here, we proposed a liquid sensor based on a binary ionic liquid system, in which a flowing ionic liquid [OMIm]PF6 is confined by another azobenzene-containing ionic liquid crystalline [OMIm]AzoO. Those crystal components provide sufficient pinning capillary force to immobilize fluidic components, leading to a freestanding liquid-like product without the possibility of leakage. In addition to owning ultra-high temperature sensitivity, crystal-confined ionic liquids also combine the performances of both liquid and solid so that it can be stretched, bent, self-healed, and remolded. With respect to the reconfigurable property, this particular class of ionic liquids is exploited as dynamic circuits which can be spatially reorganized or automatically repaired.

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“…Although these systems are a very active field of research, the actual technical implementation as high-performance supercapacitors remains challenging. One of the reasons is the relatively high viscosity of ionic liquids [8,10,11], resulting in slow ion dynamics [8,12]. While some studies find increased dynamics in the case of carbon nanoconfinement [13][14][15][16], others see a clear slowdown [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid dynamics in nanoporous carbon: A pore-size- and temperature-dependent neutron spectroscopy study on supercapacitor materials

Busch

Hofmann

Frick

et al. 2020

Phys. Rev. Materials

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The influence of spatial confinement on the thermally excited stochastic cation dynamics of the roomtemperature ionic liquid 1-N-butylpyridinium bis-[(trifluoromethyl)sulfonyl]imide ([BuPy][Tf 2 N]) inside porous carbide-derived carbons with various pore sizes in the sub-to a few nanometer range is investigated by quasielastic neutron spectroscopy. Using the potential of fixed window scans, i.e., scanning a sample parameter, while observing solely one specific energy transfer value, an overview of the dynamic landscape within a wide temperature range is obtained. It is shown that already these data provide a quite comprehensive understanding of the confinement-induced alteration of the molecular mobility in comparison to the bulk. A complementary, more detailed analysis of full energy transfer spectra at selected temperatures reveals two translational diffusive processes on different time scales. Both are considerably slower than in the bulk liquid and show a decrease of the respective self-diffusion coefficients with decreasing nanopore size. Different thermal activation energies for molecular self-diffusion in nanoporous carbons with similar pore size indicate the importance of pore morphology on the molecular mobility, beyond the pure degree of confinement. In spite of the dynamic slowing down we can show that the temperature range of the liquid state upon nanoconfinement is remarkably extended to much lower temperatures, which is beneficial for potential technical applications of such systems.

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Densities, Refractive Indices, Viscosities, and Conductivities of Non-Imidazolium Ionic Liquids [Et₃S][TFSI], [Et₂MeS][TFSI], [BuPy][TFSI], [N₈₈₈₁][TFA], and [P₁₄][DCA]

Cited by 26 publications

References 74 publications

Densities, Viscosities, and Electrical Conductivities of Pure Anhydrous Reline and Its Mixtures with Water in the Temperature Range (293.15 to 338.15) K

Densities, Viscosities, and Electrical Conductivities of Pure Anhydrous Reline and Its Mixtures with Water in the Temperature Range (293.15 to 338.15) K

Crystal-confined freestanding ionic liquids for reconfigurable and repairable electronics

Ionic liquid dynamics in nanoporous carbon: A pore-size- and temperature-dependent neutron spectroscopy study on supercapacitor materials

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