Macroscale superlubricity under extreme pressure enabled by the combination of graphene-oxide nanosheets with ionic liquid

Ge, Xiangyu; Li, Jinjin; Wang, Hongdong; Zhang, Chenhui; Liu, Yuhong; Luo, Jianbin

doi:10.1016/j.carbon.2019.05.070

Cited by 107 publications

(65 citation statements)

References 47 publications

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“…The importance of the local pressure brings the problematics of the surface roughness in play. The flattening of roughness and lowering local stresses may be one of the reasons of the necessity of the wearing-in process for achieving the superlubricity state (Ge et al, 2019a). In my opinion, the above simple picture can help a lot for both qualitative and quantitative physical understanding of the transition into the superlubricity state-both in the case of fluid superlubricity (Ge et al, 2019b) and solid state superlubricity (Erdemir and Eryilmaz, 2014) as well of the tuning of friction by electric fields (Krim, 2019; Figure 1).…”

Section: Resultsmentioning

confidence: 99%

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Contacts With Negative Work of “Adhesion” and Superlubricity

Popov

2020

Front. Mech. Eng.

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Section: Resultsmentioning

confidence: 99%

“…The critical stress will then be on the order of σ c ∼ γ / l ≈ 40 MPa. In Ge et al (2019a), the values up to 600 MPa were reported.…”

Section: Influence Of Repelling Van Der Waals Forces On Contact and Fmentioning

confidence: 99%

Contacts With Negative Work of “Adhesion” and Superlubricity

Popov

2020

Front. Mech. Eng.

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“…[40] Moreover, the peak at 401.7 eV in XPS (shown in Figure 3c) can be ascribed to the C N bond of imidazolium ring which again indicated the presence of IL on the Gr. [41,42] The results from FTIR, Raman and XPS all demonstrated all point to the strong attachment of IL on the Gr surface, through the chemical bonding with oxygen-containing groups as well as the hydrogen and π-π interactions (as depicted in Figure 3d).…”

Section: Exfoliation Effect Of Il On Grmentioning

confidence: 93%

Improved tribological and noise suppression performance of graphene/nitrile butadiene rubber composites via the exfoliation effect of ionic liquid on graphene

Xue

Zhang

et al. 2020

J of Applied Polymer Sci

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Minimization and suppression of friction and noise in underwater bearings remains a key aspect in modern marine vehicle industry owing to the growing need for reliability, and passenger comfort. In this study, graphene nano‐flake (Gr) was introduced into the nitrile butadiene rubber (NBR) with assistance of ionic liquid (IL). Owing to the positive charge generated by the secondary ordering layer on the Gr surface, Gr were effectively exfoliate into few layers and uniformly dispersed in the NBR matrix. Accordingly, the friction coefficient and volume wear rate decreased to 0.3124 and 6.44 × 10−6 mm3·N−1·m−1 in the nanocomposite, depicting a 31.52% and 51.9% reduction than pure NBR. It was demonstrated that the reinforced hardness and the formation of tribological layer of Gr played a vital role in the lubricating mechanism where both deformation and the continuation of the stick–slip effect were prevented. As a proof of concept, the total vibration acceleration level of the NBR/GR‐IL composite decreased from 111.37 ± 5.57 dB to 79.68 ± 3.98 dB, exhibiting good noise and vibration suppression effect. This work not only broadens the application of GR‐based materials, but also shed some light on the designing philosophy to improve the efficiency, service life and safety of the future marine vehicles.

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“…After achieving the desired diameter, the intense cooling of the rod with water was produced. A similar temperature regime for the production of stainless steel structure UFG was used in work (Ge et al, 2019). After rolling from each bar on a high-precision cutting machine Struers AccuTom-5 along the bar were cut samples in the form of strips 30x3x0.3 mm for mechanical testing, as well as prepared micro-plates for studying the microstructure evolution.…”

Section: Experimantal Partmentioning

confidence: 99%

“…Structural materials under the influence of irradiation experience structural transformations that have a negative impact primarily on mechanical properties and corrosion resistance. Corrosion-resistant steels and aluminum alloys exhibit the greatest resistance to radiation (Ge et al, 2019). However, the corrosion rate of aluminum -based alloys in the water environment under irradiation increases by 2-3 times, which is significantly less than austenitic chromiumnickel steels, which, nevertheless, in wet steam are also subject to intercrystalline corrosion and corrosion cracking.…”

Section: Introductionmentioning

confidence: 99%

Study of Technology for Ultrafine-Grained Materials for Usage as Materials in Nuclear Power

Naizabekov

Arbuz

Lezhnev

et al. 2019

New Trends in Production Engineering

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Nuclear power is associated with great environmental risks. In many cases, the problem of accidents of nuclear power plants is related to the use of materials that do not fully meet the following requirements: high corrosion resistance; high temperature resistance; creep resistance; fracture toughness; stability of structure and properties under irradiation. Therefore, studies aimed at finding materials that can withstand long-term loads at high temperatures, aggressive environment and gradual structural degradation under the influence of radiation are relevant. One of the structural materials, which has high resistance to radiation, is austenitic stainless steel. And one of the ways to increase the radiation resistance of parts made of this steel grade is to grind its microstructure to ultra-fine-grained state. Such structures provide a combination of a high level of strength characteristics with high plasticity, which distinguishes such materials from their coarse-grained counterparts. Also, numerous grain boundaries serve as runoff surfaces for radiation defects, preserving the structure, which causes their increased radiation resistance. From all methods for producing sub-ultra-finegrained materials the most promising is the severe plastic deformation (SPD), which can be implemented in the metal in various ways, including radial-shear rolling. This paper presents the results of studies of the process of radial-shear rolling on the mill SVP-08 and its effect on the microstructure and properties of austenitic stainless steel. During the study, bars with a diameter of 13 mm from AISI-321 steel with a grain size of 300-600 nm were obtained, while the mechanical properties increased more than 2 times compared to the initial values.

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Macroscale superlubricity under extreme pressure enabled by the combination of graphene-oxide nanosheets with ionic liquid

Cited by 107 publications

References 47 publications

Contacts With Negative Work of “Adhesion” and Superlubricity

Contacts With Negative Work of “Adhesion” and Superlubricity

Improved tribological and noise suppression performance of graphene/nitrile butadiene rubber composites via the exfoliation effect of ionic liquid on graphene

Study of Technology for Ultrafine-Grained Materials for Usage as Materials in Nuclear Power

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