Abnormal Temperature Dependence of the Viscosity of Ethylammonium Nitrate–Methanol Ionic Mixtures

Chagnes, Alexandre; Tougui, A.; Carré, Bernard; Ranganathan, Nandhini; Lemordant, Daniel

doi:10.1023/b:josl.0000035358.63305.b2

Cited by 29 publications

(24 citation statements)

References 5 publications

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“…The growth of micelles in cationic surfactant solutions [60] are among the scarce previously described observations of increasing viscosity with temperature. A. Chagnes et al [61] found an increase of viscosity with temperature at low concentrations of IL in water. They attributed these results to the formation of hydrogen bonds between the IL molecules and methanol.…”

Section: Fig 6 Viscosity () Vs Temperature For [Emim][tfsi] +Graphmentioning

confidence: 97%

Antiwear performance of ionic liquid+graphene dispersions with anomalous viscosity-temperature behavior

Pamies

Avilés

Arias‐Pardilla

et al. 2018

Tribology International

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New dispersions of few-layers graphene (G) in 1-ethyl-3-methylimidazolium ([EMIM]) ionic liquids (ILs) with dicyanamide ([DCA]) or bis(trifluoromethylsulfonyl)imide ([TFSI]) anions have been obtained by mechanical mixing and sonication. IL+0.5wt.% G dispersions show constant viscosity values from 357K (for IL=[EMIM][DCA]) or from 385K (for IL=[EMIM][TFSI]) to 393K. IL+G dispersions with G >0.5 wt.% show linear viscosity increases with increasing temperature, from 306K (for [EMIM][DCA]+1wt.%G) and from 330K to 393K (for [EMIM][TFSI]+0.75wt.%G and [EMIM][TFSI]+1wt.%G). Addition of graphene improves the poor wear reducing performance of [EMIM][DCA], and prevents surface damage on steel when added to [EMIM][TFSI]. Graphene increases the load-carrying ability of ILs, forms a surface layer on the sliding path and retains wear debris, preventing the formation of large abrasive particles.

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Section: Fig 6 Viscosity () Vs Temperature For [Emim][tfsi] +Graphmentioning

confidence: 97%

Antiwear performance of ionic liquid+graphene dispersions with anomalous viscosity-temperature behavior

Pamies

Avilés

Arias‐Pardilla

et al. 2018

Tribology International

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“…Considering that a thorough and accurate characterization of these materials has a direct impact on the knowledge of their structure and in the design of their potential applications, we have performed an exhaustive compilation of some of the most relevant physical properties. Thus, we have reviewed the state of the art of density, viscosity, electrical conductivity, refractive index and surface tension for EAN and PAN at different temperatures [ 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 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 ,…”

Section: Introductionmentioning

confidence: 99%

Influence of Small Quantities of Water on the Physical Properties of Alkylammonium Nitrate Ionic Liquids

Ausín

Parajó

Trenzado

et al. 2021

IJMS

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This paper presents a comprehensive study of two alkylammonium nitrate ionic liquids. As part of this family of materials, mainly ethylammonium nitrate (EAN) and also propylammonium nitrate (PAN) have attracted a great deal of attention during the last decades due to their potential applications in many fields. Although there have been numerous publications focused on the measurement of their physical properties, a great dispersion can be observed in the results obtained for the same magnitude. One of the critical points to be taken into account in their physical characterization is their water content. Thus, the main objective of this work was to determine the degree of influence of the presence of small quantities of water in EAN and PAN on the measurement of density, viscosity, electrical conductivity, refractive index and surface tension. For this purpose, the first three properties were determined in samples of EAN and PAN with water contents below 30,000 ppm in a wide range of temperatures, between 5 and 95 °C, while the last two were obtained at 25 °C. As a result of this study, it has been concluded that the presence of water is critical in those physical properties that involve mass or charge transport processes, resulting in the finding that the absolute value of the average percentage change in both viscosity and electrical conductivity is above 40%. Meanwhile, refractive index (≤0.3%), density (≤0.5%) and surface tension (≤2%) present much less significant changes.

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“…From the results of the viscosity study, the η E deviations are negative and have a minimum at x 1 =0.75, showing good affinity of components over the whole range of compositions [46]. These deviations could be explained by predominance of hydrogen bonds over coulombian forces.…”

Section: Excess Propertiesmentioning

confidence: 93%

Volumetric and transport properties of N-Butyl-N-methylpyrrolidinium bis(Trifluoromethanesulfonyl)imide–methanol binary mixtures

Zarrougui

Dhahbi

Lemordant

2011

Ionics

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Densities, viscosities, and ionic conductivities were measured for the binary mixtures containing the ionic liquid Nbutyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide and methanol over the entire range of compositions at the temperature varying from 253.15 to 318.15 K. The densities and viscosities decrease monotonously with temperature and the content of ionic liquids (ILs). Furthermore, excess isobaric expansion coefficient has been calculated from the experimental densities. The dependence of temperature on the viscosity has been fitted to the Arrhenius law with high precision. The dependence of temperature on the ionic conductivity has also been gauged by both of the Arrhenius and Vogel-Tamman-Fulcher (VTF) equations. In fact, the shape of the curves shows that the temperature dependence of the conductivity does not follow a simple Arrhenius law, but a better fitting of experimental results is achieved using the VTF model. Additionally, the effects of ILs concentration on the viscosity and the conductivity have been examined using the Walden rule, which shows that the variation of conductivity is inversely proportional to viscosity. Excess molar volumes and viscosity deviations for all mixtures are evaluated and well fitted to the Redlich-Kister polynomial expansions. Physicochemical properties show two clearly distinguished behaviors corresponding to ILsrich and methanol-rich regions, with distinct transport and volumetric properties. The obtained results are discussed in terms of dipolar interactions and hydrogen bonding establishment between ions of ILs and the methanol molecules.

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Abnormal Temperature Dependence of the Viscosity of Ethylammonium Nitrate–Methanol Ionic Mixtures

Cited by 29 publications

References 5 publications

Antiwear performance of ionic liquid+graphene dispersions with anomalous viscosity-temperature behavior

Antiwear performance of ionic liquid+graphene dispersions with anomalous viscosity-temperature behavior

Influence of Small Quantities of Water on the Physical Properties of Alkylammonium Nitrate Ionic Liquids

Volumetric and transport properties of N-Butyl-N-methylpyrrolidinium bis(Trifluoromethanesulfonyl)imide–methanol binary mixtures

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