The study of hexanoate-based protic ionic liquids used as lubricants in steel-steel contact

Guo, Hong; Smith, Thomas W.; Iglesias, Patricia

doi:10.1016/j.molliq.2019.112208

Cited by 29 publications

(29 citation statements)

References 31 publications

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“…The molecular structures (as shown in Fig. 1) of the three PILs were confirmed from the results of proton nuclear magnetic resonance ( 1 H NMR) characterization which can be found in our previous papers [41,44]. In light of the molecular structures of the three PILs (in Fig.…”

Section: Chemical Reagents Synthesis and Characterizations Of Protisupporting

confidence: 75%

“…In this study, the chemical reagents used to synthesize the PILs were commercially available from Sigma-Aldrich (USA) and used as received without any treatment. The three ecofriendly hexanoate-based protic ionic liquids (PILs) used in this study were prepared in the laboratory according to a procedure published in our previous papers [41,44]. The molecular structures (as shown in Fig.…”

Section: Chemical Reagents Synthesis and Characterizations Of Protimentioning

confidence: 99%

“…According to [41,44], the ionicity of a PIL has critical effects on their lubricating behavior. The three PILs in this study showed a decreasing order of ionicity (Det > Met > Eet) at room temperature, where the corresponding ionic conductivity is 680, 405, and 95 µS/cm [44].…”

Section: Ionicity Solubility and Stabilitymentioning

confidence: 99%

“…Since PILs can be formed easily through the Brønsted acid-base reactions, they can easily be tuned by varying ion structures to control the relative strength of hydrogen bonding, Coulomb interactions, and dispersion forces to satisfy specific working conditions [39]. Recently, many researchers are studying ecofriendly PILs as neat lubricants or additives in different contacts, where these PILs only include nitrogen, carbon, oxygen, and hydrogen elements in their molecules [14,37,40,41]. It is important to note that the internal hydrogen bonding is found to strengthen the interactions between the lubricant molecules or between the lubricant base and additives that help improve their compatibility and the overall tribological performance [41][42][43].…”

Section: Introductionmentioning

confidence: 99%

“…In recent studies, Iglesias's research team has designed and synthesized a series of three halogen-free PILs derived from a weak acid with three alkanol amines with different base strengths [41,44]. The ionicity of the three PILs was studied and the lubricating performance of neat PILs and PILs blended with a bio-oil was evaluated in a steel/steel contact.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Hydrogen Bonding and Ionicity of Protic Ionic Liquids on Lubricating Steel–Steel and Steel–Aluminum Contacts: Potential Ecofriendly Lubricants and Additives

et al. 2020

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Three ecofriendly protic ionic liquids (PILs), 2-hydroxyethylammonium 2-ethylhexanoate, 2-hydroxymethylammonium 2-ethylhexanoate, and 2-hydroxydimethylammonium 2-ethylhexanoate, with different extents of hydrogen bonding and ionicities, were synthesized and examined as neat lubricants and lubricant additives to a mineral oil (MO) under steel/steel and steel/aluminum contacts. The stability of each PIL-MO blend was observed and correlated to their individual structural features; their physicochemical and tribological properties were investigated and compared to a commercial mineral oil-based lubricant. The addition of any PIL to the mineral oil improved lubricity in steel/steel contact. In aluminum/steel contact, the PILs were studied as neat lubricants and additives showing different effects. The PIL with lower extent of hydrogen bonding but higher ionicity presented poor friction and led to higher wear as neat lubricant. However, as additive, this PIL prevented the intense tribo-corrosion reactions and generated a stable lubrication film that reduced friction; and was capable to form a protective layer on aluminum surface to avoid severe wear.

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Section: Chemical Reagents Synthesis and Characterizations Of Protisupporting

confidence: 75%

Section: Chemical Reagents Synthesis and Characterizations Of Protimentioning

confidence: 99%

Section: Ionicity Solubility and Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Hydrogen Bonding and Ionicity of Protic Ionic Liquids on Lubricating Steel–Steel and Steel–Aluminum Contacts: Potential Ecofriendly Lubricants and Additives

et al. 2020

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Macroscale Superlubrication Achieved with Shear‐Thinning Semisolid Lubricants

Wang,

Zhang,

Zheng

et al. 2024

Advanced Materials

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Macrosuperlubric materials are pivotal for reducing friction and wear in engineering applications. However, current solid superlubricants require intricate fabrication and specific conditions (e.g., vacuum or inert atmospheres), while liquid superlubricants are prone to creep, leakage, and corrosion. Here, a novel semisolid subnanometer nanowire (SNW) superlubrication material based on the shear‐thinning effect is introduced to overcome these challenges. The SNWs achieve an exceptionally low friction coefficient (0.008–0.009) with silicon nitride (Si3N4) and polytetrafluoroethylene (PTFE) tribo‐pairs, demonstrating a brief running‐in period (≈39 s) and stable superlubrication over extended friction (12 h, >120 000 cycles). The combination of the shear‐thinning network structure mechanism, the adsorption membrane mechanism, and hydrodynamic effects provides a synergistic effect, playing a crucial role in achieving superlubricity. Additionally, SNWs can be combined with various base oils to create semisolid gel lubricants with superlubricating properties. This innovative approach addresses the limitations of current superlubrication systems and introduces a new category of semisolid gel lubricants, significantly expanding the applications of superlubrication materials.

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