Dynamic Viscosity of Tetracyanoborate- and Tricyanomethanide-Based Ionic Liquids by Dynamic Light Scattering

Bi, Shengshan; Koller, Thomas M.; Rausch, Michael H.; Wasserscheid, Peter; Fröba, Andreas P.

doi:10.1021/acs.iecr.5b00086

Cited by 27 publications

(26 citation statements)

References 35 publications

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“…For the characterization of particle size and its distribution as well as the dispersion stability of the nanofluids in the same fluid state as it is investigated in connection with the effective thermal conductivity, the diffusion coefficients were obtained by dynamic light scattering (DLS). For details on the principles of the technique [52] and its application for the determination of several thermophysical properties of various types of fluids [53][54][55][56] and dispersed systems [57][58][59], the reader is referred to the respective literature. In the following, only the information relevant for the present investigations is given.…”

Section: Diffusion Coefficients By Dynamic Light Scattering (Dls)mentioning

confidence: 99%

Effective Thermal Conductivity of Nanofluids: Measurement and Prediction

et al. 2020

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In the present study, the effective thermal conductivity of nanoparticle dispersions, so-called nanofluids, is investigated experimentally and theoretically. For probing the influence of the nanoparticles on the effective thermal conductivity of dispersions with water as liquid continuous phase, nearly spherical and monodisperse titanium dioxide (TiO 2 ), silicon dioxide (SiO 2 ), and polystyrene (PS) nanoparticles with strongly varying thermal conductivities were used as model systems. For the measurement of the effective thermal conductivity of the nanofluids with particle volume fractions up to 0.31, a steady-state guarded parallel-plate instrument was applied successfully at temperatures between (298 and 323) K. For the same systems, dynamic light scattering (DLS) was used to analyze the collective translational diffusion, which provided information on the dispersion stability and the distribution of the particle size as essential factors for the effective thermal conductivity. The measurement results for the effective thermal conductivity show no temperature dependency and only a moderate change as a function of particle volume fraction, which is positive or negative for particles with larger or smaller thermal conductivities than the base fluid. Based on these findings, our theoretical model for the effective thermal conductivity originally developed for nanofluids containing fully dispersed particles of large thermal conductivities was revisited and also applied for a reliable prediction in the case of particles of relatively low thermal conductivities.

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Section: Diffusion Coefficients By Dynamic Light Scattering (Dls)mentioning

confidence: 99%

Effective Thermal Conductivity of Nanofluids: Measurement and Prediction

et al. 2020

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“…À or [TCM] À ) are low-viscous ILs, 55 which have been currently successfully evaluated concerning their potential use in gas separation processes. 2,49,50 Some thermophysical properties for imidazolium [TCM] À -based ILs have been recently reported in the literature.…”

Section: Imidazolium Based Ils Containing the Anion Tricyanomethanidementioning

confidence: 99%

“…2,49,50 Some thermophysical properties for imidazolium [TCM] À -based ILs have been recently reported in the literature. 56, 57 Neves et al 58 performed for the first time a consistent and comprehensive structure-property study for a set of imidazolium-based ILs with cyano-functionalized anions, where the effect of the anion on the studied properties was investigated. However, the effect of the chemical nature of those ILs and their impact on the structural segregation of ILs is not clear.…”

Section: Imidazolium Based Ils Containing the Anion Tricyanomethanidementioning

confidence: 99%

Thermophysical properties of imidazolium tricyanomethanide ionic liquids: experiments and molecular simulation

Zubeir

Rocha

Vergadou

et al. 2016

Phys. Chem. Chem. Phys.

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The low-viscous tricyanomethanide ([TCM]À )-based ionic liquids (ILs) are gaining increasing interest as attractive fluids for a variety of industrial applications. The thermophysical properties (density, viscosity, surface tension, electrical conductivity and self-diffusion coefficient) of the 1-alkyl-3-methylimidazolium tricyanomethanide [C n mim][TCM] (n = 2, 4 and 6-8) IL series were experimentally measured over the temperature range from 288 to 363 K. Moreover, a classical force field optimized for the imidazolium-based[TCM] À ILs was used to calculate their thermodynamic, structural and transport properties (density, surface tension, self-diffusion coefficients, viscosity) in the temperature range from 300 to 366 K. The predictions were directly compared against the experimental measurements. The effects of anion and alkyl chain length on the structure and thermophysical properties have been evaluated. In cyano-based ILs, the density decreases with increasing molar mass, in contrast to the behavior of the fluorinated anions, being in agreement with the literature. The contribution per -CH 2 -group to the increase of the viscosity presents the following sequence: The experimentally determined self-diffusion coefficients of the cations are in good agreement with the molecular simulation predictions, in which a decrease of the self-diffusion of the cations with increasing alkyl chain length is observed with a simultaneous increase in viscosity and for the longer alkyl lengths the anion becomes more mobile than the cation.

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“…This is consistent with our results for the binary mixtures of 4 ] and CO 2 could be deduced from the solubility and permeability data reported by Mahurin et al 6 This value, for which no details on the corresponding gas mole fraction are given, is shown in Figure 3 and agrees well with our measured and calculated data. 41 ). To quantify the influence of the dynamic viscosity of the three specific ILs on the mutual and self-diffusivities in their mixtures with small mole fractions of dissolved CO 2 , a correlation between the properties is shown in Figure 4 in the form of a double-logarithmic plot.…”

Section: O 2 and H 2 S In [Emim][b(cn) 4 ]mentioning

confidence: 99%

Mutual and Self-Diffusivities in Binary Mixtures of [EMIM][B(CN)₄] with Dissolved Gases by Using Dynamic Light Scattering and Molecular Dynamics Simulations

et al. 2015

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Ionic liquids (ILs) are possible working fluids for the separation of carbon dioxide (CO2) from flue gases. For evaluating their performance in such processes, reliable mutual-diffusivity data are required for mixtures of ILs with relevant flue gas components. In the present study, dynamic light scattering (DLS) and molecular dynamics (MD) simulations were used for the investigation of the molecular diffusion in binary mixtures of the IL 1-ethyl-3-methylimidazolium tetracyanoborate ([EMIM][B(CN)4]) with the dissolved gases carbon dioxide, nitrogen, carbon monoxide, hydrogen, methane, oxygen, and hydrogen sulfide at temperatures from 298.15 to 363.15 K and pressures up to 63 bar. At conditions approaching infinite dilution of a gas, the Fick mutual diffusivity of the mixture measured by DLS and the self-diffusivity of the corresponding gas calculated by MD simulations match, which could be generally found within combined uncertainties. The obtained diffusivities are in agreement with literature data for the same or comparable systems as well as with the general trend of increasing diffusivities for decreasing IL viscosities. The DLS and MD results reveal distinctly larger molecular diffusivities for [EMIM][B(CN)4]-hydrogen mixtures compared to mixtures with all other gases. This behavior results in the failure of an empirical correlation with the molar volumes of the gases at their normal boiling points. The DLS experiments also showed that there is no noticeable influence of the dissolved gas and temperature on the thermal diffusivity of the studied systems.

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Dynamic Viscosity of Tetracyanoborate- and Tricyanomethanide-Based Ionic Liquids by Dynamic Light Scattering

Cited by 27 publications

References 35 publications

Effective Thermal Conductivity of Nanofluids: Measurement and Prediction

Effective Thermal Conductivity of Nanofluids: Measurement and Prediction

Thermophysical properties of imidazolium tricyanomethanide ionic liquids: experiments and molecular simulation

Mutual and Self-Diffusivities in Binary Mixtures of [EMIM][B(CN)₄] with Dissolved Gases by Using Dynamic Light Scattering and Molecular Dynamics Simulations

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Dynamic Viscosity of Tetracyanoborate- and Tricyanomethanide-Based Ionic Liquids by Dynamic Light Scattering

Cited by 27 publications

References 35 publications

Effective Thermal Conductivity of Nanofluids: Measurement and Prediction

Effective Thermal Conductivity of Nanofluids: Measurement and Prediction

Thermophysical properties of imidazolium tricyanomethanide ionic liquids: experiments and molecular simulation

Mutual and Self-Diffusivities in Binary Mixtures of [EMIM][B(CN)4] with Dissolved Gases by Using Dynamic Light Scattering and Molecular Dynamics Simulations

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Mutual and Self-Diffusivities in Binary Mixtures of [EMIM][B(CN)₄] with Dissolved Gases by Using Dynamic Light Scattering and Molecular Dynamics Simulations