High Pressure Rheological Behavior of 1-Ethyl-3-methylimidazolium <i>n</i>-Hexylsulfate and Trihexyl(tetradecyl)phosphonium Tris(pentafluoroethyl)trifluorophosphate

Regueira, Teresa; Lugo, Luis; Comuñas, Marı́a J. P.; Fernández, Josefa

doi:10.1021/acs.jced.7b00181

Cited by 6 publications

(4 citation statements)

References 63 publications

(147 reference statements)

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“…55 Regueira et al also reported the rheological characterization of two different ILs ([C 2 C 1 im][C 6 SO 4 ] and [P 6,6,6,14 ][(C 2 F 5 ) 3 PF 3 ]) and the results were compared with the reference oils used for lubrication. 62 Newtonian behavior was observed for both ILs and the viscosity values of [C 2 C 1 im]-[C 6 SO 4 ] were closer to that of polyalkylene glycol.…”

Section: ■ Introductionmentioning

confidence: 77%

“…Arrhenius law was observed to be appropriate to fit the viscosity–temperature data of aprotic ILs, whereas the Vogel–Tamman–Fulcher relation was more suited to ILs having functionalized or a symmetric cation. , The viscosity and viscoelastic properties of ILs also decreased at the transition temperature for liquid crystalline to isotropic phase transformation . Regueira et al also reported the rheological characterization of two different ILs ([C 2 C 1 im][C 6 SO 4 ] and [P 6,6,6,14 ][(C 2 F 5 ) 3 PF 3 ]) and the results were compared with the reference oils used for lubrication . Newtonian behavior was observed for both ILs and the viscosity values of [C 2 C 1 im][C 6 SO 4 ] were closer to that of polyalkylene glycol.…”

Section: Rheology Of Pure Ionic Liquids (Ils)mentioning

confidence: 99%

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Rheology of Pure Ionic Liquids and Their Complex Fluids: A Review

Shakeel

Mahmood

Farooq

et al. 2019

ACS Sustainable Chem. Eng.

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Ionic liquids (ILs) are liquid salts at ambient or lower temperatures and consist of ions and short-lived ion pairs. They are potential alternatives to toxic, hazardous, highly flammable, and volatile solvents for preparing solutions, dispersions, gels, composites, and polymeric melts. ILs have some very interesting and unique characteristics like good chemical and thermal stability and very low vapor pressures. They have good solvation interactions with a wide range of organic, inorganic, and polymeric compounds. They can enhance colloidal stability and the elasticity range of polymers. ILs are environmental friendly, easily recyclable, and structurally similar to the conventional solvents. For optimal performance, it is necessary to fully understand the rheological properties of ILs and their different systems for academic interests such as understanding the ability of ILs as processing aids particularly in film casting, fiber spinning and spraying, comprehension of thermodynamics and dynamics of polymer chains in ILs, analyzing the hydrodynamic volume of dispersed polymer, polymer–ILs interactions, characterizing the viscoelastic properties and nanophase–ILs interactions in nanocomposite systems, analyzing the plasticization efficiency, and the final properties of the composite system. The rheological analysis is also important for industrial purposes particularly for designing processing techniques and suitable operating conditions for IL based systems. The aim of this review is to give an overview of the rheological properties of pure ionic liquids and solutions, dispersions, gels, composites, and melts based on ionic liquids.

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Section: ■ Introductionmentioning

confidence: 77%

Section: Rheology Of Pure Ionic Liquids (Ils)mentioning

confidence: 99%

Rheology of Pure Ionic Liquids and Their Complex Fluids: A Review

Shakeel

Mahmood

Farooq

et al. 2019

ACS Sustainable Chem. Eng.

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“…The rightmost expression gives Δ V ‡ in terms of the modified VFT coefficients of eq . α η, p is an important parameter in tribology for the calculation of lubrication film thickness, and there is some interest in the use of ionic liquids as lubricants though the corrosive nature of [BMIM][Ac] probably precludes its use for this purpose. Isotherms (323.15 K (50 °C)) for other [BMIM] + ionic liquids are shown for comparison.…”

Section: Discussionmentioning

confidence: 99%

Temperature and Pressure Dependence of the Viscosity of the Ionic Liquid 1-Butyl-3-methylimidazolium Acetate

Harris

2020

J. Chem. Eng. Data

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Viscosities obtained with a falling-body viscometer are reported at pressures up to 300 MPa, over the temperature range 278–353 K, for 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]) samples dried under high vacuum with water content [106 × w(H2O) = 258 and 1180] and ion purity x > 0.992. Atmospheric pressure densities are reported for 273–363 K. Comparison is made with literature viscosities and densities at 0.1 MPa. There is a very large variation in the former, which seems in part due to differences in the purities of the source materials. It is recommended that methanol-free reagents should be used for Karl Fischer water analysis of ionic liquid acetates and that samples used for thermophysical property measurements should be well characterized by spectroscopic methods, not just water content. The proton resonance at the C2 position on the imidazolium ring appears to be a good qualitative indication of the dryness. “Activation” volumes, ΔV ‡, are calculated from the parameters of a fit to a pressure-modified Vogel–Fulcher–Tamman (VFT) equation and compared with those for other 1-butyl-3-methylimidazolium ionic liquids. Thermodynamic or density scaling has been applied to the reduced viscosity as a function of the group (TV γ), γ being the single scaling parameter, equal to 2.02.

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“…2012-051-1-100; 2013-05-15) “International standard for viscosity at temperatures up to 473 K and pressures below 200 MPa” was launched with the goal to identify and characterize a reference fluid with a viscosity around 20 mPa·s at those limiting temperature and pressure conditions. These conditions are now encountered routinely in the exploitation of fossil fuel reservoirs and in lubrication − In a series of papers, − the candidature of tris(2-ethylhexyl) trimellitate (TOTM) has been considered for such a fluid. Most recently, an article was published that provided the results of an international collaborative study to establish standard reference values for the viscosity, density, surface tension, and rheological character of TOTM.…”

Section: Introductionmentioning

confidence: 99%

Density and Rheology of Tris(2-ethylhexyl) Trimellitate (TOTM)

et al. 2018

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This article presents new density data and some rheological studies on tris(2-ethylhexyl) trimellitate (TOTM) which has recently been proposed as a reference fluid for viscosity at high temperatures and high pressures. The density data have been obtained with the aid of an Anton Paar DMA HP U-tube instrument, covering temperatures from 328 to 423 K and pressures up to 70 MPa, and they are aimed at extending the temperature range of previous results. They are also used to check the effect of interlot consistency of the density data for TOTM. The present density measurements are compared with previously published data. Rheological tests were carried out to complement earlier studies. Particular attention is given to the shear rate range of greatest interest for the proposed use of TOTM as an industrial reference fluid for viscosity: the tests include shear stresses up to 750 Pa and shear rates up to 4000 s −1 under atmospheric pressure. The tests were carried out using a Parallel Plate Rheometer AR1500ex10C4298. The results at a temperature of 298 K corroborate the previous findings that TOTM is Newtonian below a shear rate of 600 s −1 , which is entirely compatible with its use as an industrial calibrating fluid for viscosity. At shear rates higher than 600 s −1 a shear-thinning like behavior is observed.

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High Pressure Rheological Behavior of 1-Ethyl-3-methylimidazolium n-Hexylsulfate and Trihexyl(tetradecyl)phosphonium Tris(pentafluoroethyl)trifluorophosphate

Cited by 6 publications

References 63 publications

Rheology of Pure Ionic Liquids and Their Complex Fluids: A Review

Rheology of Pure Ionic Liquids and Their Complex Fluids: A Review

Temperature and Pressure Dependence of the Viscosity of the Ionic Liquid 1-Butyl-3-methylimidazolium Acetate

Density and Rheology of Tris(2-ethylhexyl) Trimellitate (TOTM)

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