Influence of the anion on the surface tension of 1-ethyl-3-methylimidazolium-based ionic liquids

Almeida, Hugo F. D.; Teles, Ana Rita R.; Lopes‐da‐Silva, José A.; Freire, Mara G.; Coutinho, João A. P.

doi:10.1016/j.jct.2012.03.008

Cited by 65 publications

(55 citation statements)

References 49 publications

(89 reference statements)

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“…Overall, the relative deviations on the surface tension data for CN-based ILs, obtained by different authors, range between -6.6 % and 18.3%. Nevertheless, a good agreement is observed between the data acquired in this work and those already published, namely for [C 4 were previously reported by us [34] and are represented alongside with the new experimental data. For all ILs, the surface tension presents a quasi-linear dependence with temperature.…”

Section: Surface Tensionsupporting

confidence: 90%

“…As previously observed for other ILs [6,31,[34][35][36]57], imidazolium-based fluids combined with cyanobased anions display low surface enthalpies and entropies when compared with molecular organic compounds. This low surface enthalpies and entropy reflect a high surface organization as well as a highly structured liquid phase.…”

Section: Surface Thermodynamics Properties and Estimated Critical Temsupporting

confidence: 77%

“…As reported in previous works [6,31,[34][35][36]57], the values for critical temperatures of ILs obtained by these approximations must be used with caution. The estimation of critical temperatures using data from a narrow temperature range, and demanding a large extrapolation, are a source of uncertainty.…”

Section: Surface Thermodynamics Properties and Estimated Critical Temmentioning

confidence: 89%

“…The density values required for the calculation of the surface tensions from the drop image data were taken from literature [29]. Further details on the equipment and its validity to measure surface tensions of ILs can be found in previous publications [34][35][36][37]. [38] is a well-known method for a priori prediction of thermophysical properties and phase behavior on the basis of unimolecular quantum chemical calculations.…”

Section: Surface Tension-mentioning

confidence: 99%

“…Table 1. The ILs 1-ethyl-3-methylimidazolium thiocyanate and 1-ethyl-3-methylimidazolium dicyanamide were also considered and used in this work for comparison purposes, although their surface tension data were taken from a previous work [34]. The cation-anion matrix of the studied ILs is depicted Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Surface tensions of ionic liquids: Non-regular trend along the number of cyano groups

Almeida

Carvalho

Kurnia

et al. 2016

Fluid Phase Equilibria

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Ionic liquids (ILs) with cyano-functionalized anions are a set of fluids that are still poorly characterized despite their remarkably low viscosities and potential applications. Aiming at providing a comprehensive study on the influence of the number of -CN groups through the surface tension and surface organization of ILs, the surface tensions of imidazolium-based ILs with cyano-functionalized anions were determined at atmospheric pressure and in the ( Therefore, the surface tension of this homologous series does not decrease with the increase of the number of -CN groups at the anion as has been previously shown by studies performed with a more limited matrix of ILs. A maximum in the surface tension and critical temperature was observed for [N(CN) 2 ]-based ILs. Furthermore, a minimum in the surface entropy, indicative of a highly structured surface, was found for the same class of ILs. All these evidences seem to be a result of stronger hydrogen-bonding interactions occurring in [N(CN) 2 ]-based ILs, when compared with the remaining CN-based counterparts, and as sustained by cation-anion interaction energies derived from the Conductor Like Screening Model for Real Solvents (COSMO-RS).

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Section: Surface Tensionsupporting

confidence: 90%

Section: Surface Thermodynamics Properties and Estimated Critical Temsupporting

confidence: 77%

Section: Surface Thermodynamics Properties and Estimated Critical Temmentioning

confidence: 89%

Section: Surface Tension-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Surface tensions of ionic liquids: Non-regular trend along the number of cyano groups

Almeida

Carvalho

Kurnia

et al. 2016

Fluid Phase Equilibria

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Accurate thermodynamic modeling of ionic liquids/metal salt mixtures: Application to carbon monoxide reactive absorption

et al. 2017

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For the first time, a theoretical semipredictive approach based on the soft‐Statistical Associating Fluid Theory equation of state is presented to model the complexation reaction between carbon monoxide (CO) in a combined ionic liquid (IL) plus a copper(I) metallic salt media in terms of the gas solubility as a function of temperature, pressure, and composition. Two different degrees of molecular approximation are tested. In the first approach, the IL‐metal salt mixture is treated as a single compound whose parameters are modified according to the concentration of the metallic salt. In the second approach, both compounds are treated as independent species, enhancing the predictive capability of the model. The complexation between CO molecules and the metal salt is reproduced by adding specific cross‐association interaction sites that simulate the reaction. The density of the doped IL and the CO solubility are described in quantitative agreement with the experimental data at different operating conditions. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3532–3543, 2017

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The challenge of predicting spinnability: Investigating benefits of adding lignin to cellulose solutions in air‐gap spinning

Bengtsson

Jedvert

Köhnke

et al. 2021

J of Applied Polymer Sci

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In this study, the underlying mechanism for improved spinnability when mixing lignin and cellulose in solution was investigated. Co‐processing of lignin and cellulose has previously been identified as a potential route for production of inexpensive and bio‐based carbon fibers. The molecular order of cellulose contributes to the strength of the fibers and the high carbon content of lignin improves the yield during conversion to carbon fibers. The current work presents an additional benefit of combining lignin and cellulose; solutions that contain both lignin and cellulose could be air‐gap spun at substantially higher draw ratios than pure cellulose solutions, that is, lignin improved the spinnability. Fibers were spun from solutions containing different ratios of lignin, from 0 to 70 wt%, and the critical draw ratio was determined at various temperatures of solution. The observations were followed by characterization of the solutions with shear and elongational viscosity and surface tension, but none of these methods could explain the beneficial effect of lignin on the spinnability. However, by measuring the take‐up force it was found that lignin seems to stabilize against diameter fluctuations during spinning, and plausible explanations are discussed.

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Influence of the anion on the surface tension of 1-ethyl-3-methylimidazolium-based ionic liquids

Cited by 65 publications

References 49 publications

Surface tensions of ionic liquids: Non-regular trend along the number of cyano groups

Surface tensions of ionic liquids: Non-regular trend along the number of cyano groups

Accurate thermodynamic modeling of ionic liquids/metal salt mixtures: Application to carbon monoxide reactive absorption

The challenge of predicting spinnability: Investigating benefits of adding lignin to cellulose solutions in air‐gap spinning

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