scholarly journals Understanding the thermal decomposition mechanism of a halogen-free chelated orthoborate-based ionic liquid: a combined computational and experimental study

2016 ◽  
Vol 18 (32) ◽  
pp. 22458-22466 ◽  
Author(s):  
M. Golets ◽  
M. R. Shimpi ◽  
Y.-L. Wang ◽  
O. N. Antzutkin ◽  
S. Glavatskih ◽  
...  
Keyword(s):  
Experimental Study ◽  
Thermal Decomposition ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Vapour Pressure ◽  
Lubricant Additives ◽  
Thermal Decomposition Mechanism ◽  
Halogen Free ◽  
Significant Attention

In the last few decades, ionic liquids (ILs) have gained significant attention as lubricants and lubricant additives due to their polar nature, low vapour pressure and tunable physicochemical properties.

Friction and Wear Properties of Halogen-Free and Halogen-Containing Ionic Liquids Used As Neat Lubricants, Lubricant Additives and Thin Lubricant Layers

2017 ◽  
Author(s):  
Hong Guo ◽  
Rui Liu ◽  
Alfonso Fuentes-Aznar ◽  
Patricia Iglesias Victoria
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Friction And Wear ◽  
Mineral Oil ◽  
Surface Interactions ◽  
Lubricant Additives ◽  
Wear Properties ◽  
Sem Images ◽  
Wear Reduction ◽  
Halogen Free

The lubricating ability of one halogen-free and one halogen-containing phosphonium-based ionic liquids are investigated as neat lubricants, lubricant additives and thin lubricant layers in steel-steel contact. The use of the ionic liquids in any of the three lubricating methods reduced friction and wear compared to a base mineral oil. The halogen-free ionic liquid outperformed the halogen-containing ionic liquid in the three methods of lubrication. The highest friction and wear reduction were obtained when ionic liquids were used as neat lubricants. Under this condition, friction reductions of 37.21% and 25.73 %, and wear reduction of 47.12% and 41.18% compared to the based mineral oil were obtained for the halogen-free and halogen-containing ionic liquids respectively. The wear mechanisms and surface interactions are discussed in terms of ionic liquid-metal surface interactions from optical and SEM images and EDS analysis.

scholarly journals Halogen-free pyrrolidinium bis(mandelato)borate ionic liquids: some physicochemical properties and lubrication performance as additives to polyethylene glycol

RSC Advances ◽  
2014 ◽  
Vol 4 (58) ◽  
pp. 30617-30623 ◽  
Author(s):  
Mamoun Taher ◽  
Faiz Ullah Shah ◽  
Andrei Filippov ◽  
Patrick de Baets ◽  
Sergei Glavatskih ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Polyethylene Glycol ◽  
Physicochemical Properties ◽  
Friction Coefficients ◽  
Lubrication Performance ◽  
Halogen Free

Friction coefficients for a pyrrolidinium orthoborate ionic liquid as 3 wt% additive in PEG, neat PEG and 5W40.

scholarly journals Effect of Ionicity of Three Protic Ionic Liquids as Neat Lubricants and Lubricant Additives to a Biolubricant

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 713 ◽  
Author(s):  
Hong Guo ◽  
Angela Rina Adukure ◽  
Patricia Iglesias
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Friction And Wear ◽  
Cost Effective ◽  
Lubricant Additive ◽  
Lubricant Additives ◽  
Environmental Damage ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
Wear Process

Friction and wear of sliding surfaces are responsible for important energy losses and negative environmental effects. The use of environmentally friendly and cost-effective protic ionic liquids as neat lubricants and lubricant additives has the potential to increase the efficiency and durability of mechanical components without increasing the environmental damage. In this work, three halogen-free protic ionic liquids with increasing extent of ionicity, 2-hydroxyethylammonium 2-ethylhexanoate, 2-hydroxymethylammonium 2-ethylhexancate, and 2-hydroxydimethylammonium 2-ethylhexanoate, were synthesized and studied as neat lubricants and additives to a biodegradable oil in a steel–steel contact. The results show that the use of any protic ionic liquid as a neat lubricant or lubricant additive reduced friction and wear with respect to the biodegradable oil. The ionic liquid with the lowest ionicity reached the highest wear reduction. The one possessing the highest ionicity presented the poorest friction and wear behaviors as a neat lubricant, probably due to the more ionic nature of this liquid, which promoted tribocorrosion reactions on the steel surface. This ionic liquid performed better as an additive, showing that a small addition of this liquid in a biodegradable oil is enough to form protective layers on steel surfaces. However, it is not enough to accelerate the wear process with detrimental tribocorrosion reactions.

Thermal Decomposition Mechanism of 1-Ethyl-3-methylimidazolium Bromide Ionic Liquid

2011 ◽  
Vol 116 (24) ◽  
pp. 5867-5876 ◽  
Author(s):  
Steven D. Chambreau ◽  
Jerry A. Boatz ◽  
Ghanshyam L. Vaghjiani ◽  
Christine Koh ◽  
Oleg Kostko ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Ionic Liquid ◽  
Decomposition Mechanism ◽  
Thermal Decomposition Mechanism

Addition of low concentrations of an ionic liquid to a base oil reduces friction over multiple length scales: a combined nano- and macrotribology investigation

2016 ◽  
Vol 18 (9) ◽  
pp. 6541-6547 ◽  
Author(s):  
Hua Li ◽  
Anthony E. Somers ◽  
Patrick C. Howlett ◽  
Mark W. Rutland ◽  
Maria Forsyth ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Lubricant Additives ◽  
Length Scales ◽  
Base Oil ◽  
Model Base ◽  
Multiple Length Scales ◽  
Low Concentrations

The efficacy of ionic liquids (ILs) as lubricant additives to a model base oil has been probed at the nanoscale and macroscale as a function of IL concentration using the same materials.

scholarly journals Advances Achieved by Ionic-Liquid-Based Materials as Alternative Supports and Purification Platforms for Proteins and Enzymes

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2542
Author(s):  
Rui M. F. Bento ◽  
Catarina A. S. Almeida ◽  
Márcia C. Neves ◽  
Ana P. M. Tavares ◽  
Mara G. Freire
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Pharmaceutical Sciences ◽  
Development Phase ◽  
Preparative Liquid Chromatography ◽  
Advantages And Disadvantages ◽  
The Past ◽  
Properties Of Materials ◽  
Supported Ionic Liquids ◽  
Significant Attention

Ionic liquids (ILs) have been applied in several fields in which enzymes and proteins play a noteworthy role, for instance in biorefinery, biotechnology, and pharmaceutical sciences, among others. Despite their use as solvents and co-solvents, their combination with materials for protein- and enzyme-based applications has raised significant attention in the past few years. Among them, significant advances were brought by supported ionic liquids (SILs), in which ILs are introduced to modify the surface and properties of materials, e.g., as ligands when covalently bond or when physiosorbed. SILs have been mainly investigated as alternative supports for enzymes in biocatalysis and as new supports in preparative liquid chromatography for the purification of high-value proteins and enzymes. In this manuscript, we provide an overview on the most relevant advances by using SILs as supports for enzymes and as purification platforms for a variety of proteins and enzymes. The interaction mechanisms occurring between proteins and SILs/ILs are highlighted, allowing the design of efficient processes involving SILs. The work developed is discussed in light of the respective development phase and innovation level of the applied technologies. Advantages and disadvantages are identified, as well as the missing links to pave their use in relevant applications.

scholarly journals Ionic Liquids as High-Performance Lubricants and Lubricant Additives

2021 ◽  
Author(s):  
Hong Guo ◽  
Patricia Iglesias Victoria
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
High Performance ◽  
Negative Impact ◽  
Molecular Structures ◽  
Lubricant Additives ◽  
Friction Reduction ◽  
Protic Ionic Liquids ◽  
Protection Mechanisms ◽  
Low Toxicity

Taking into account the environmental awareness and ever-growing restrictive regulations over contamination, the study of new lubricants or lubricant additives with high performance and low toxicity over the traditional lubes to reduce the negative impact on the environment is needed. In this chapter, the current literature on the use of ionic liquids, particularly protic ionic liquids, as high-performance lubricants and lubricant additives to different types of base lubricants are reviewed and described. The relation between ionic liquids structures and their physicochemical properties, such as viscosity, thermal stability, corrosion behavior, biodegradability, and toxicity, is elaborated. Friction reduction and wear protection mechanisms of the ionic liquids are discussed with relation to their molecular structures and physicochemical properties.

scholarly journals Rheology of phosphonium ionic liquids: a molecular dynamics and experimental study

2018 ◽  
Vol 20 (15) ◽  
pp. 10193-10203 ◽  
Author(s):  
Sten Sarman ◽  
Yong-Lei Wang ◽  
Patrick Rohlmann ◽  
Sergei Glavatskih ◽  
Aatto Laaksonen
Keyword(s):  
Molecular Dynamics ◽  
Experimental Study ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Phosphonium Ionic Liquids

Comparison between the theoretical and experimental viscosity of an ionic liquid.

Functionalized Ionic Liquids as Lubricants for Steel-Steel Contact

2011 ◽  
Vol 138-139 ◽  
pp. 630-634 ◽  
Author(s):  
Li Ye Zhu ◽  
Li Gong Chen ◽  
Xin Yang ◽  
Hong Bin Song
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Friction Mechanisms ◽  
Ester Group ◽  
Friction Reducing

A new series of functionalized ionic liquids containing ester-group were synthesized through a typical two-step way. The physicochemical properties of the functionalized ionic liquids were studied and the tribological properties of them as lubricants for steel-steel contact were evaluated on an SRV friction and wear tester and compared with the perfluoroalkylpolyether (PFPE), a low-volatility and fluorine containing lubricant, and a conventional ionic liquid, 1-butyl-3-methy imidazolium tetrafluoroborate (LB104), which is nonfunctionalized. Results showed that all the ionic liquids studied in this paper have better lubricities than PFPE as lubricants for steel-steel friction pairs. Functionalized ionic liquids show worse friction reducing abilities at relatively lower loads, which could be ascribed to their higher viscosities, but they always exhibit better anti-wear abilities than LB104. The possible friction mechanisms were discussed.

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