Triborheology and orientational dynamics of ionic liquid crystals

Pogodina, N.V.; Amann, Tobias; Dold, Christian; Metwalli, Ezzeldin; Müller‐Buschbaum, Peter; Kailer, Andreas; Friedrich, Chr.

doi:10.1016/j.molliq.2013.09.022

Cited by 14 publications

(14 citation statements)

References 30 publications

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“…[21,29,36,37] and has also been predicted by Molecular Dynamics simulations [38]. After this value is reached, at medium and high velocity rates, a Newtonian behavior is found and the viscosity is constant with a value 10 times lower than the one found at low shear rate.…”

Section: Resultsmentioning

confidence: 55%

“…In the case of fluids with a certain degree of phase ordering, the non-Newtonian phenomenon is typically prevalent [27]. Shear thinning of ILs has been reported previously in the literature because of the existence of liquid phase aggregates or networks [24,28,29]. This non-Newtonian behavior has been ascribed to molecular layering in the case of imidazolium-based ILs [30,31].…”

Section: Introductionmentioning

confidence: 88%

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Rheological behavior of multiwalled carbon nanotube-imidazolium tosylate ionic liquid dispersions

et al. 2017

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The rheological behavior of 1-ethyl-3-methylimidazolium tosylate (EMIMTsO) and its dispersions with aligned and non-aligned multi-walled carbon nanotubes (MWCNTs) has been studied. Raman spectroscopy analysis has been carried out to characterize the samples. The effects of concentration, type of CNTs and temperature on the viscolelastic behavior of EMIMTsO have been evaluated. Regardless the concentration and type of added CNTs, a non-Newtonian behavior of the fluids has been found under shear stress.The ionic liquid and the EMIMTsO-MWCNTs 1 wt% dispersion showed a temperatureinduced gelation. However, the addition of small concentrations of MWCNTs prevents from the formation of gels.

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Section: Resultsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 88%

Rheological behavior of multiwalled carbon nanotube-imidazolium tosylate ionic liquid dispersions

et al. 2017

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“…Pogodina et al [16] found excellent friction-reducing ability for imidazolium-derived ILCs with a 14-carbon lateral alkyl chain on the imidazolium ring, [C 14 mim] (mim = methylimidazolium), and different fluorinated anions such as BF 4 , PF 6 and (CF 3 SO 2 ) 2 N, which belong to the most commonly used anions ( Figure 5). Molecular ordering and tribochemical interactions are two decisive factors in ILC tribology.…”

Section: Chain Lengthmentioning

confidence: 99%

Ionic Liquid Crystals in Tribology

et al. 2019

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The present work intends to provide a brief account of the most recent advances in the use of ionic liquid crystals (ILCs) in the field of tribology, that is, the development of new lubricants with the ability to reduce the coefficients of friction and the wear rates of materials under sliding conditions. After a definition of ILCs and their relationship with neutral liquid crystals (LCs) and ionic liquids (ILs), the review will be focused on the influence of molecular structure and composition on the tribological performance, the combination with base oils, surfactants or water, and the different sliding configuration and potential applications. The main mechanisms proposed in order to justify the lubricating ability of ILCs will be analyzed. Special emphasis will be made for recent results obtained for fatty acid derivatives due to their renewable and environmentally friendly nature.

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“…A new field of research is currently opening up in the field of ionic liquid crystals (ILCs) [29], also in combination with water [36,37]. It is assumed that the resulting ultralow friction and wear are ascribed to their specific molecular interactions and orientation in the shear flow [38]. The liquid crystalline mesophase is characterized by the anisotropy of physical properties, especially, in this case, the viscosity.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic Friction Studies of Alkylglucopyranosides as Additives for Water-Based Lubricants

et al. 2020

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Water-based lubricants might become an interesting alternative to conventional oil-based lubricants and help to reduce wear as well as improve the energy efficiency of transport processes. Since pure water is generally a rather poor lubricant due to its low viscosity and corrosiveness, it must be tribologically optimized with suitable additives. Here, we study the friction behavior of alkyl glucopyranosides (AGPs) with varying lengths of the alkyl chain. Sliding experiments show that a significant reduction in the coefficient of friction compared to that of pure water is observed. The extent of friction reduction depends strongly on the concentration and on the shearing conditions. It is assumed that the low coefficients of friction are due to the ability of AGPs to form liquid crystalline phases with an ordered structure in the friction gap. Furthermore, the interaction of the AGPs with the surface forms a wear protection layer (boundary lubrication). The friction properties of the water-based system are compared to those of a conventional, mineral oil-based lubricant.

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Triborheology and orientational dynamics of ionic liquid crystals

Cited by 14 publications

References 30 publications

Rheological behavior of multiwalled carbon nanotube-imidazolium tosylate ionic liquid dispersions

Rheological behavior of multiwalled carbon nanotube-imidazolium tosylate ionic liquid dispersions

Ionic Liquid Crystals in Tribology

Macroscopic Friction Studies of Alkylglucopyranosides as Additives for Water-Based Lubricants

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