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.

scholarly journals Lyotropic liquid crystal phase behavior of a cationic amphiphile in aqueous and non-stoichiometric protic ionic liquid mixtures

Soft Matter ◽  
2020 ◽  
Vol 16 (41) ◽  
pp. 9456-9470
Author(s):  
Dilek Yalcin ◽  
Calum J. Drummond ◽  
Tamar L. Greaves
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Liquid Mixtures ◽  
Lyotropic Liquid Crystal ◽  
Liquid Crystal Phase ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
Cationic Amphiphile

Protic ionic liquids (PILs) are the largest and most tailorable known class of non-aqueous solvents which possess the ability to support amphiphile self-assembly.

Role of Cation in Enhancing the Conversion of the Alzheimer’s Peptide into Amyloid Fibrils Using Protic Ionic Liquids

2012 ◽  
Vol 65 (11) ◽  
pp. 1502 ◽  
Author(s):  
Natalie Debeljuh ◽  
Swapna Varghese ◽  
Colin J. Barrow ◽  
Nolene Byrne
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Primary Amine ◽  
Amyloid Fibrils ◽  
Tertiary Amines ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
The Difference ◽  
The Impact

We report on the impact of changes in the protic ionic liquid (pIL) cation on the fibrilisation kinetics and the conversion of the Aβ 16–22 from monomers to amyloid fibrils. When we compare the use of primary, secondary, and tertiary amines we find that the primary amine results in the greatest conversion into amyloid fibrils. We show that the pIL is directly interacting with the peptide and this likely drives the difference in conversion and kinetics observed.

scholarly journals The beneficial effect of protic ionic liquids on the lithium environment in electrolytes for battery applications

2014 ◽  
Vol 2 (22) ◽  
pp. 8258-8265 ◽  
Author(s):  
Thomas Vogl ◽  
Sebastian Menne ◽  
Ruben-Simon Kühnel ◽  
Andrea Balducci
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Beneficial Effect ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid

Protic ionic liquid-based electrolytes are promising electrolytes for lithium-ion batteries.

Ionothermal synthesis of crystalline metal phosphites using multifunctional protic ionic liquids

CrystEngComm ◽  
2020 ◽  
Vol 22 (37) ◽  
pp. 6096-6100
Author(s):  
Ting Li ◽  
Yumei Mao ◽  
Yue Qi ◽  
Hongmei Zeng ◽  
Guohong Zou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Mixed Valence ◽  
Reducing Agent ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
Structure Directing Agent ◽  
Ionothermal Synthesis ◽  
Phosphorus Source ◽  
Crystalline Metal

A mixed-valence iron phosphite was prepared under ionothermal conditions using a protic ionic liquid as a solvent, a structure-directing agent, a phosphorus source, and a reducing agent.

scholarly journals A methanol and protic ionic liquid Ugi multicomponent reaction path to cytotoxic α-phenylacetamido amides

RSC Advances ◽  
2019 ◽  
Vol 9 (14) ◽  
pp. 7652-7663 ◽  
Author(s):  
Ahmed Al Otaibi ◽  
Fiona M. Deane ◽  
Cecilia C. Russell ◽  
Lacey Hizartzidis ◽  
Siobhann N. McCluskey ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Multicomponent Reaction ◽  
Reaction Path ◽  
Ugi Reaction ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
Ethanoic Acid ◽  
Ethylammonium Nitrate

The Ugi reaction (aldehyde, amine, isocyanide and an ethanoic acid) in the protic ionic liquids ethylammonium nitrate (EAN) and propylammonium nitrate (PAN) gave excellent yields of α-phenylacetamido amides.

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 The use of protic ionic liquids with cathodes for sodium-ion batteries

2016 ◽  
Vol 4 (27) ◽  
pp. 10472-10478 ◽  
Author(s):  
T. Vogl ◽  
C. Vaalma ◽  
D. Buchholz ◽  
M. Secchiaroli ◽  
R. Marassi ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid

Protic ionic liquid-based electrolytes are promising electrolytes for sodium-ion batteries.

scholarly journals The Structure of the Electric Double Layer of the Protic Ionic Liquid [Dema][TfO] Analyzed by Atomic Force Spectroscopy

2021 ◽  
Vol 22 (23) ◽  
pp. 12653
Author(s):  
Christian Rodenbücher ◽  
Yingzhen Chen ◽  
Klaus Wippermann ◽  
Piotr M. Kowalski ◽  
Margret Giesen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Double Layer ◽  
Electric Double Layer ◽  
Force Spectroscopy ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
Atomic Force Spectroscopy ◽  
Atomic Force ◽  
Acidic Ionic Liquids

Protic ionic liquids are promising electrolytes for fuel cell applications. They would allow for an increase in operation temperatures to more than 100 °C, facilitating water and heat management and, thus, increasing overall efficiency. As ionic liquids consist of bulky charged molecules, the structure of the electric double layer significantly differs from that of aqueous electrolytes. In order to elucidate the nanoscale structure of the electrolyte–electrode interface, we employ atomic force spectroscopy, in conjunction with theoretical modeling using molecular dynamics. Investigations of the low-acidic protic ionic liquid diethylmethylammonium triflate, in contact with a platinum (100) single crystal, reveal a layered structure consisting of alternating anion and cation layers at the interface, as already described for aprotic ionic liquids. The structured double layer depends on the applied electrode potential and extends several nanometers into the liquid, whereby the stiffness decreases with increasing distance from the interface. The presence of water distorts the layering, which, in turn, significantly changes the system’s electrochemical performance. Our results indicate that for low-acidic ionic liquids, a careful adjustment of the water content is needed in order to enhance the proton transport to and from the catalytic electrode.

One-pot integrated biofuel production using low-cost biocompatible protic ionic liquids

2017 ◽  
Vol 19 (13) ◽  
pp. 3152-3163 ◽  
Author(s):  
Jian Sun ◽  
N. V. S. N. Murthy Konda ◽  
Ramakrishnan Parthasarathi ◽  
Tanmoy Dutta ◽  
Marat Valiev ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Cellulosic Ethanol ◽  
Low Cost ◽  
Biofuel Production ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
One Pot ◽  
Solid Liquid ◽  
Liquid Separations

We present an inexpensive and biocompatible protic ionic liquid that enables one-pot integrated cellulosic ethanol production without any pH adjustments and without water-wash or solid–liquid separations.

Tribological Properties of Ammonium Protic Ionic Liquids As Additives in Polyalphaolefin for Steel-Steel Contact

2019 ◽  
Author(s):  
Hong Guo ◽  
Patricia Iglesias
Keyword(s):  
Ionic Liquids ◽  
Friction And Wear ◽  
Tribological Behavior ◽  
Lubricant Additives ◽  
Protic Ionic Liquids ◽  
Wear Performance ◽  
Different Temperatures ◽  
Effective Lubricant ◽  
Higher Temperature ◽  
Brønsted Base

Abstract Around 23% of the world’s energy consumption results from rubbing contacts, in which 20% is used to overcome friction and 3% is due to wear and the consequent failure. The implementation of lubricants and effective lubricant additives are indispensable to reduce friction and wear of rubbing materials. Protic Ionic Liquids (PILs), which are easily obtained by proton transfer from a Brønsted acid to a Brønsted base, have shown great potential to be used as lubricants due to their structures and tunable properties. In this study, two kinds of novel PILs, bis(2-hydroxyethylammonium) succinate (DSu) and tri-[bis(2-hydroxyethylammonium)] citrate (DCi), were synthesized and tested as lubricant additives. The tribological behavior of the two PILs is studied as additives in 1 wt. % to a base synthetic lubricant (PAO) for steel-steel contact under different temperatures (room temperature and 100°C) and normal loads (3 N and 4 N) using a ball-on-flat reciprocating tribometer. When 1 wt. % of any PILs is added into PAO, friction is reduced compared to that with neat PAO at all temperatures and loads studied, and good anti-wear performance is also obtained under the higher temperature studied. Particularly, 1 wt. % DCi +PAO shows the best high-temperature tribological behavior under 4N, with friction and wear reductions of 33% and 35%, respectively.

Sign in / Sign up

Export Citation Format

Share Document