Ionic Liquids as Grease Base Liquids

Mozes, Robert; Cooper, Peter K.; Li, Hua

doi:10.3390/lubricants5030031

Cited by 11 publications

(5 citation statements)

References 49 publications

(66 reference statements)

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“…Many physical properties of ILs make them promising candidates for next-generation lubricants. − Atomic force microscopy − (AFM) and surface forces apparatus nanoscale friction experiments, as well as molecular dynamics simulations, , have demonstrated the importance of IL nanostructure for boundary lubrication. Boundary lubrication occurs at high loads when the bulk of the lubricant is squeezed out, and only a thin liquid layer lubricates the sliding surfaces .…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid Adsorption at the Silica–Oil Interface Revealed by Neutron Reflectometry

Cooper

Yepuri

et al. 2018

J. Phys. Chem. C

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Previous nanotribology measurements demonstrated that 2 mol % of the oil-miscible ionic liquid (IL) trihexyltetradecyl(phosphonium) bis(2,4,4-trimethylpentyl)phosphinate (P 6,6,6,14 ( i C 8 ) 2 PO 2 ) diluted in octane lubricated as effectively as pure IL. However, until now the structure and composition of the lubricating adsorbed layer, which is critical for lubrication, was unknown. Here, the unconfined structure of the IL adsorbed layer at the oil−silica interface has been studied using neutron reflectometry. Multiple neutron contrasts revealed an 8 Å thick adsorbed layer, even at 60 and 80 °C. The ratio of cations and anions in the layer was investigated by synthesizing the IL with deuterated cations and measuring its reflectivity at the oil−silica interface. At 60 °C the layer was composed of 48 ± 6 mol % P 6,6,6,14 + cations, 24 ± 2 mol % ( i C 8 ) 2 PO 2 − anions, and 28 ± 8 mol % octane, while at 80 °C the composition was 50 ± 2 mol % P 6,6,6,14 + , 28 ± 2 mol % ( i C 8 ) 2 PO 2 − anions, and 22 ± 2 mol % octane. These results reinforce the importance of the judicious selection of IL cations and anions for charged surfaces and support their use in high-temperature applications.

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Section: Introductionmentioning

confidence: 99%

Ionic Liquid Adsorption at the Silica–Oil Interface Revealed by Neutron Reflectometry

Cooper

Yepuri

et al. 2018

J. Phys. Chem. C

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“…The interaction and arrangement of the ionic liquid molecules creates temporary particle-like structures that impede the flow of the oil, leading to a jammed state [60]. It is noteworthy that this finding is particularly interesting, as shear thickening behavior at lower shear rates is not commonly observed in studies involving ionic liquids, as stated in previously published articles [61][62][63].…”

Section: Effect Of Nanoadditive Concentrationmentioning

confidence: 70%

Enhancing the Performance of Rapeseed Oil Lubricant for Machinery Component Applications through Hybrid Blends of Nanoadditives

Nassef,

Pape,

Poll

2023

Lubricants

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Bio-lubricants have demonstrated promising tribological and physical properties, suggesting their potential advantages in the lubrication of critical machinery components. This study investigates the impact of using blended individual and hybrid nanoadditives, such as graphene nanoplatelets, ZnO, and an ionic liquid (IL) of Trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl)phosphinate, on the rheological, tribological, and physical characteristics of rapeseed oil. A commercial cutting fluid (BLASER Vasco 6000) (VB 6000) is used for comparison. The results revealed a substantial improvement in viscosity index (VI) values for mixtures containing graphene nanoplatelets, reaching up to 150%, as compared to VB 6000. Regarding the tribological behavior, the friction coefficient achieved a reduction of up to 20% at room temperature (RT) and 26% at 60 °C for the hybrid containing all three nanoadditives (H3), outperforming the commercial fluid. Moreover, H3 demonstrated the most substantial reductions in wear volume (84%) and surface roughness (60%). The wettability of H3 benefited from the combined mechanisms of the applied nanoadditives; its application the contact angle decreased by 63%, revealing its outstanding spreadability. The results reveal the high potential of the H3 hybrid as a competitive and green metal working fluid that can replace hostile and toxic ones in industrial applications.

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“…It is also noteworthy to mention that the tip of the needle may not be placed exactly at the center of the tube, but this does not affect or change the physics of droplet generation because of two reasons. First, because the PTFE is hydrophobic, a layer of mineral oil exists between droplets and the internal surface of the tube, and the droplets will not be in contact with the PTFE tube. Second, the maximum angle of intersection between two fluids is less than 0.3°, and this deviation does not change the capillary number, Reynolds number, or the diameter of the generated droplets …”

Section: Methodsmentioning

confidence: 99%

Developing an Off-the-Shelf Microfluidic Droplet Generation Device for Cell Encapsulation

Hassani-Gangaraj

Shamloo

2022

Ind. Eng. Chem. Res.

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Droplet microfluidics is a platform of microfluidics in which two immiscible fluids are used to generate droplets for various biomedical applications. This platform introduces several advantages in applications such as cell lysis, cell culture, co-culture, and cell encapsulation. The most important issues regarding droplet generation devices are the fabrication complexity and maintenance of these devices. In this study, a simple and easy-tofabricate microdroplet generator is designed and fabricated to resolve these issues. Furthermore, since this device is easy to fabricate and use, it can play a key role in the fabrication of medical devices for controlling infectious diseases in poor and underdeveloped countries where 3D-printed and glass capillary devices have high final costs. The introduced droplet generator is an independent unit that is able to attach to any microfluidic chip and inject microdroplets into the device. This droplet generator is able to generate homogeneous droplets of various diameters, ranging from 50 to 2000 μm. This device is also efficient for single-and multi-cell encapsulation. When using a cell solution containing MCF-7 cells with a concentration of 100 cell/μL, 45.7% of droplets contain no cells, 49.3% of droplets contain one, two, or three cells, and 5% contain four or more cells. These results are perfectly in agreement with the results obtained from the Poisson distribution for cell encapsulation.

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Ionic Liquids as Grease Base Liquids

Cited by 11 publications

References 49 publications

Ionic Liquid Adsorption at the Silica–Oil Interface Revealed by Neutron Reflectometry

Ionic Liquid Adsorption at the Silica–Oil Interface Revealed by Neutron Reflectometry

Enhancing the Performance of Rapeseed Oil Lubricant for Machinery Component Applications through Hybrid Blends of Nanoadditives

Developing an Off-the-Shelf Microfluidic Droplet Generation Device for Cell Encapsulation

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