Transport Properties of Binary Mixtures of Carbon Dioxide and 1-Butyl-3-methylimidazolium Hexafluorophosphate Studied by Transient Grating Spectroscopy

Demizu, Masashi; Terazima, Masahide; Kimura, Yoshifumi

doi:10.2116/analsci.24.1329

Cited by 12 publications

(29 citation statements)

References 45 publications

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“…A similar enhancement in transport phenomena, induced by CO 2 dissolution, was sometimes reported by several researchers [14][15][16][17][18][19][20]. Kimura et al [20] [17] and typical 1-alkyl-3-methylimidazolium salts with ½PF 6 À , ½BF 4 À , and ½Tf 2 N À anions [42], though Zhang et al [16] reported the anomalous pressure dependence of conductivity in [BMIM][PF 6 ]; the conductivity remained unchanged at lower pressures and increased at higher pressures, which might be possibly caused by water contamination. These facts could support the linear pressure dependence of diffusion coefficients of molecular as well as ionic species in IL-CO 2 systems, in spite of the non-linear pressure dependence observed in the present study.…”

Section: Resultssupporting

confidence: 82%

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Chronoamperometric determination of diffusion coefficients of ferrocene in ionic liquids mixed with CO2 at high pressures

Guo

Kanakubo

Kodama

et al. 2010

Journal of Electroanalytical Chemistry

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Section: Resultssupporting

confidence: 82%

“…The viscosities [14,15] and electrical conductivities [16,17] 6 ] saturated with CO 2 were investigated at high pressures. Spectroscopic techniques have also been employed to estimate the liquid properties in view of solute molecules dissolved in ILs [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Chronoamperometric determination of diffusion coefficients of ferrocene in ionic liquids mixed with CO2 at high pressures

Guo

Kanakubo

Kodama

et al. 2010

Journal of Electroanalytical Chemistry

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“…33 Generally, the major sources of errors are caused by the diffraction of acoustic waves, acoustic streaming, local sample heating by acoustic waves (particularly near the transducer), and the lack of parallelism between the transducer and reflector. 7 The last, but most sophisticated method for measurements in ILs, is the transient grating spectroscopy, 12,[19][20][21][22][23][24] which is classified as an optic method. The principle of this method is described in detail by Eichler et al 44 and is based on the formation of gratings in an electric laser field in weakly absorbing samples.…”

Section: Speed Of Sound Measurementsmentioning

confidence: 99%

“…The search queries were "ionic liquid" together with "speed of sound", "sound velocity", "ultrasonic sound velocity", "ultrasonic velocity", "sound speeds", "ultrasonic speed", "speed of (Table S1). 1,2,[12][13][14][15][18][19][20][21][22][23][25][26][27][28][29][30][31]33,35,36,45, 12,14,18,19,22,23,25,30,34 The purity of these ILs is compared in Table 4. Among those ILs, two were the most investigated in the literature:…”

Section: Overview Of Existing Data For Ionic Liquidsmentioning

confidence: 99%

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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“…Generally, the TG method seems more suitable for measuring ultrasound velocity than the ultrasound absorption, and in the case of RTILs, a few suchlike reports can be found. [15][16][17][18][19] The abovementioned study of the ultrasound absorption and the recently observed nonNewtonian behavior along with lack of the dynamic crossover in the range of 1.2-1. as well as deeper knowledge about molecular dynamics may be additionally interesting to the research community. To complete the ultrasound absorption study and to obtain a set of 6 absorption measurements were carried out using a measuring set based on the standard pulse method with a variable path length.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Relaxation Study of 1-Alkyl-3-methylimidazolium-Based Room-Temperature Ionic Liquids: Probing the Role of Alkyl Chain Length in the Cation

et al. 2016

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Ultrasound absorption spectra of four 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide were determined as a function of the alkyl chain length on the cation from 1-propyl-to 1-hexyl-from 293.15 to 323.15 K at ambient pressure. Herein, the ultrasound absorption measurements were carried out using a standard pulse technique within a frequency range from 10 to 300 MHz. Additionally the speed of sound, density and viscosity have been measured. The presence of strong dissipative processes during the ultrasound wave propagation was found experimentally, i.e. relaxation processes in the megahertz range were observed for all compounds over the whole temperature range. The relaxation spectra (both relaxation amplitude and relaxation frequency) were shown to be dependent on the alkyl side chain length of the 1-alkyl-3-methylimidazolium ring. In most cases, a single Debye model described the absorption spectra very well. However, a comparison of the determined spectra with the spectra of a few other imidazolium-based ionic liquids reported in the literature (in part recalculated in this work) shows that the complexity of the spectra increases rapidly with the elongation of the alkyl chain length on the cation.This complexity indicates that both the volume viscosity and the shear viscosity are involved in relaxation processes even in relatively low frequency ranges. As a consequence, the sound velocity dispersion is present at relatively low megahertz frequencies.

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Transport Properties of Binary Mixtures of Carbon Dioxide and 1-Butyl-3-methylimidazolium Hexafluorophosphate Studied by Transient Grating Spectroscopy

Cited by 12 publications

References 45 publications

Chronoamperometric determination of diffusion coefficients of ferrocene in ionic liquids mixed with CO2 at high pressures

Chronoamperometric determination of diffusion coefficients of ferrocene in ionic liquids mixed with CO2 at high pressures

Speed of Sound and Ultrasound Absorption in Ionic Liquids

Ultrasonic Relaxation Study of 1-Alkyl-3-methylimidazolium-Based Room-Temperature Ionic Liquids: Probing the Role of Alkyl Chain Length in the Cation

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