Tunable, Wide‐Temperature, and Macroscale Superlubricity Enabled by Nanoscale Van Der Waals Heterojunction‐to‐Homojunction Transformation

Yang, Xing; Li, Ruiyun; Wang, Yongfu; Zhang, Junyan

doi:10.1002/adma.202303580

Cited by 12 publications

(1 citation statement)

References 74 publications

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“…In addition, Yang et al transformed multiple nanoheterojunctions into homogeneous structures by doping graphene edges with oxygen, which effectively suppresses the edge effect. The structure exhibits ultra-low friction (with a COF of approximately 0.005) across a wide range of loads, speeds, and temperatures (from −200 to 300 • C) [125].…”

Section: Progress In Macroscale Structural Superlubricitymentioning

confidence: 99%

Structural Superlubricity of Two-Dimensional Materials: Mechanisms, Properties, Influencing Factors, and Applications

Wu,

Zhou,

Ouyang

et al. 2024

Lubricants

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Structural superlubricity refers to the lubrication state in which the friction between two crystalline surfaces in incommensurate contact is nearly zero; this has become an important branch in recent tribological research. Two-dimensional (2D) materials with structural superlubricity such as graphene, MoS2, h-BN, and alike, which possess unique layered structures and excellent friction behavior, will bring significant advances in the development of high-performance microelectromechanical systems (MEMS), as well as in space exploration, space transportation, precision manufacturing, and high-end equipment. Herein, the review mainly introduces the tribological properties of structural superlubricity among typical 2D layered materials and summarizes in detail the underlying mechanisms responsible for superlubricity on sliding surfaces and the influencing factors including the size and layer effect, elasticity effect, moiré superlattice, edge effect, and other external factors like normal load, velocity, and temperature, etc. Finally, the difficulties in achieving robust superlubricity from micro to macroscale were focused on, and the prospects and suggestions were discussed.

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Section: Progress In Macroscale Structural Superlubricitymentioning

confidence: 99%

Structural Superlubricity of Two-Dimensional Materials: Mechanisms, Properties, Influencing Factors, and Applications

Wu,

Zhou,

Ouyang

et al. 2024

Lubricants

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Robust Macroscale Superlubricity in Humid Air via Designing Amorphous DLC/Crystalline TMDs Friction Pair

Zhu,

Zhang,

et al. 2024

Adv Funct Materials

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Superlubricity, a cutting‐edge concept, has the potential to drive the Fourth Industrial Revolution giving its near‐zero energy consumption, but the challenge is how to achieve it in humid air with chemical activity and at macroscale surfaces with unavoidable defects. Here, a novel principle involving the amorphous/crystalline friction pair based on the cognition that tribochemical interaction sites originate from grain boundary defect locations is proposed to achieve macroscale superlubricity in humid air. The absence of grain boundaries in amorphous diamond‐like carbon (DLC) significantly reduces chemical interaction during the sliding process. This is supported by experimental observations of priority oxidation at the grain boundaries. Results indicate DLC versus MoS2 friction pair has weakened chemical interaction and less humid insensitivity compared to the MoS2 versus MoS2 pair, even increasing the contact area. Theoretical simulation suggests that DLC versus MoS2 pair eliminates the cross‐linking of friction interlayers induced by the enrichment of H2O molecules at MoS2 defects. The robust superlubricity is achieved for the typical friction pair of DLC versus MoS2 in air (RH≤25%) at macroscopic contact pressure (1.1 GPa) with friction coefficient in 10−3 magnitude and extra‐long anti‐wear life (more than 2 × 105 cycles), which is of significance for the industrialization of superlubricity.

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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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Tunable, Wide‐Temperature, and Macroscale Superlubricity Enabled by Nanoscale Van Der Waals Heterojunction‐to‐Homojunction Transformation

Cited by 12 publications

References 74 publications

Structural Superlubricity of Two-Dimensional Materials: Mechanisms, Properties, Influencing Factors, and Applications

Structural Superlubricity of Two-Dimensional Materials: Mechanisms, Properties, Influencing Factors, and Applications

Robust Macroscale Superlubricity in Humid Air via Designing Amorphous DLC/Crystalline TMDs Friction Pair

Macroscale Superlubrication Achieved with Shear‐Thinning Semisolid Lubricants

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