Physical properties of ionic liquids based on 1-alkyl-3-methylimidazolium cation and hexafluorophosphate as anion and temperature dependence

Pereiro, Ana B.; Legido, J.L.; Guez, A.

doi:10.1016/j.jct.2006.12.005

Cited by 222 publications

(207 citation statements)

References 20 publications

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“…[6][7][8] Unfortunately, this crucial condition can sometimes be overlooked. In other words, it should be keep in mind that for all aprotic RTILs studied to date, the determined f rel decrease with the decreasing temperature 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 30 and increasing side alkyl chain length in 3-methylimidazolium cation, 1 3,58 In other words, the lower the temperature, the higher the increase of the speed of sound with the decreasing temperature (concave up curve) is observed, and it is typical behavior in dispersion regions. 54,55 In the case of Because of the relatively large ultrasonic absorption in many RTILs, ultrasonic velocity is subject to a considerable dispersion.…”

Section: Acs Paragon Plus Environmentmentioning

confidence: 97%

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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Section: Acs Paragon Plus Environmentmentioning

confidence: 97%

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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“…The coefficients c 1 -c 3 were fixed for each IL by correlating the viscosity data at 0.1 MPa and their numerical values were reported in Table 4. Table 5 contains the AAD of the calculated viscosity coefficients of studied pure ILs from the experimental ones [33,34,37,39,[41][42][43][44][45][46][47][48] in temperature interval 278-363 K and atmospheric pressure. For 150 data point examined, the overall AADs for MET and RHS models were found to be 5.78 and 6.06, respectively.…”

Section: Rough Hard-sphere-based Modelmentioning

confidence: 99%

Thermophysical properties of ionic liquids and their mixtures from a new equation of state

Akbari

Alavianmehr

Ardakani

et al. 2017

Ionics

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In our previous work, a perturbed hard-trimersphere equation of state (PHTS EOS) was developed for modeling the phase equilibria of pure ionic liquids (ILs) (M.M. Alavianmehr et al., Ionics 22 (2016) 2447-2459. In this work, we have successfully extended the model to the mixtures of IL + IL and IL + solvent. Two temperaturedependent parameters appearing in the EOS are correlated with two microscopic scaling constants σ, the effective hardsphere diameter, and ε, the non-bonded interaction energy. The overall average absolute deviation (AAD) of the estimated densities from the literature data using the proposed model with and without non-additivity parameter (λ ij ) was found to be 0.44 and 0.79%, respectively. A modified Enskog equation and rough hard-sphere (RHS) theory are combined with our proposed equation of state to calculate the viscosity coefficient of ionic liquids and their mixtures. Finally, from the results obtained, a linear relation between logarithm of surface tension and viscosity property of ionic liquid was developed.

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“…Besides pyridinium and imidazolium cations, other less common organic cations have been used for the preparation of ionic liquids. These include ammonium, pyrrolidium, sulfonium and phosphonium ions (Figure 2.9) (Pereiro et al, 2007). …”

Section: Fig 28 Examples Of Ionic Liquidsmentioning

confidence: 99%

“…ILs that have been specifically designed for use in catalysis, chromatography, spectrometry, electrochemical applications, as chemo sensors and extraction solvents have been reported in a number of publications (Visser and Rogers, 2004;Liu et al, 2004;Cruz and Moens, 2000). Task specific ionic liquids that have been synthesised for the purposes of metal extraction from aqueous media have also been reported (Pereiro et al, 2007;Liu et al, 2005;Visser et al, 2002). Metal ions such as Hg 2+ , Cd 2+ , Sr 2+ and Cs + have been removed from aqueous media using ILs (Visser and Rogers, 2004).…”

Section: Applications and Uses Of Ilsmentioning

confidence: 99%

Polymerization of Cyclodextrin-Ionic Liquid Complexes for the Removal of Organic and Inorganic Contaminants from Water

Mahlambi¹,

Malefetse²,

Mamba³

et al. 2011

Ionic Liquids: Applications and Perspectives

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Physical properties of ionic liquids based on 1-alkyl-3-methylimidazolium cation and hexafluorophosphate as anion and temperature dependence

Cited by 222 publications

References 20 publications

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

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

Thermophysical properties of ionic liquids and their mixtures from a new equation of state

Polymerization of Cyclodextrin-Ionic Liquid Complexes for the Removal of Organic and Inorganic Contaminants from Water

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