Results 11 to 20 of about 17,356 (156)

Macroscale Superlubricity with a High Load‐Carrying Capacity Enabled by Nitrogen‐Doped Graphene Quantum Dots in Lubricated Silicon‐Doped Amorphous Carbon Films [PDF]

Small Structures
Achieving macroscale superlubricity with engineering materials is highly desirable for energy conservation, environmental benefits, and longevity of mechanical components. However, attaining superlubricity in aqueous‐lubricated systems with enhanced load‐
Irfan Nadeem, Matjaž Finšgar, Goran Dražić, Bojan Ambrožič, Matjaž Malok, Albano Cavaleiro, Mitjan Kalin   +6 more
doaj   +4 more sources

Macroscale, humidity-insensitive, and stable structural superlubricity achieved with hydrogen-free graphene nanoflakes [PDF]

Nature Communications
Achieving solid superlubricity in high-humidity environments is of great practical importance yet remains challenging nowadays, due to the complex physicochemical roles of water and concomitant oxidation on solid surfaces.
Ruiyun Li, Xing Yang, Jiacheng Li, Yongfu Wang, Ming Ma   +4 more
doaj   +3 more sources

Macroscale Superlubricity and Polymorphism of Long-Chain n-Alcohols [PDF]

ACS Applied Materials & Interfaces, 2020
Simple n -alcohols, such as 1-dodecanol, show anomalous film-forming and friction behaviour under elastohydrodynamic lubrication (EHL) conditions, as found inside bearings and gears. Using tribometer, diamond anvil cell (DAC), and differential scanning calorimetry (DSC) experiments, we show ...
Tom Reddyhoff, James P. Ewen, Pushkar Deshpande, Mark D. Frogley, Mark D. Welch, Wren Montgomery   +5 more
core   +8 more sources

Shear-Induced Emergence of Aromatic Superlow-Friction Interfaces in Amorphous Carbon: Triggering Chemical Impurities and Atomic-Scale Mechanisms. [PDF]

Adv Sci (Weinh)
High‐throughput quantum‐mechanical simulations reveal that amorphous carbon undergoes shear‐driven structural transformation into aromatic, graphene‐like interfaces. This mechanochemical process is governed by dopant chemistry: dopants with valency less than four promote the emergence of superlow‐friction amorphous graphene, whereas tetra‐valent ...
Kuwahara T, Horiguchi K, Mayrhofer L, Moras G, Moseler M.   +4 more
europepmc   +2 more sources

Unravelling friction anisotropy by atomic force microscopy. [PDF]

J Microsc
Abstract Friction plays a crucial role in both natural phenomena, from the flow of blood cells to earthquakes, and technological applications, from car engines to wind turbines. One of the most fundamental aspects of tribology is friction anisotropy, that is, the dependence of the friction force vector on the direction of sliding.
Cafolla C, Campione M.
europepmc   +2 more sources

Microscale Contact Electrification with Unprecedented High Intrinsic Charge Density. [PDF]

Small
With the atomically flat contact interface by a microscale graphite slider and polytetrafluoroethylene, microscale contact electrification with high contact efficiency is achieved. The developed microscale triboelectric nanogenerator exhibits a record‐high intrinsic triboelectric charge density of 2.6 mC m−2, which is attributed to the greatly enhanced
Chen C, Nie J, An J, Xia X, Wu Z, Wang H, Cui H, Zheng Q, Zi Y.   +8 more
europepmc   +2 more sources

Electrically Tunable Friction: From Sticky to Slippery with Ionic Hydrogels. [PDF]

Adv Mater
This work demonstrates electrically tunable friction “from sticky to slippery” using ionic hydrogels, achieving reversible more‐than‐fifty‐fold modulation without liquid lubricants. An electric field extracts a salt‐rich interfacial layer that dramatically reduces friction.
Liu C, Yao Y, Wang Y, Zhou Q, Zhao Z, Qiao C, Sun Y, Meng Y, Tian Y, Zeng H.   +9 more
europepmc   +2 more sources

Macro-superlubricity in sputtered MoS2-based films by decreasing edge pinning effect

Friction, 2023
To date, MoS2 can only be achieved at microscale. Edge pinning effect caused by structure defects is the most obvious barrier to expand the size of structural superlubricity to macroscale.
Chunmeng Dong, Dong Jiang, Yanlong Fu, Desheng Wang, Qinqin Wang, Lijun Weng, Ming Hu, Xiaoming Gao, Jiayi Sun   +8 more
doaj   +2 more sources

Unraveling the Interfacial Properties of Twisted Single-Crystal Au(111)/MoS₂ Heterostructures: A Pathway to Robust Superlubricity. [PDF]

Adv Sci (Weinh)
Interfacial mechanical properties of MoS2/Au(111) heterostructures are revealed by advanced experimental and computational methods. The developed semi‐anisotropic interlayer potential (SAIP) accurately predicts moiré‐driven out‐of‐plane corrugation, aligning with experimental observations.
Yao Y, Song Y, Wu B, Scherb S, Huang S, Hinaut A, Glatzel T, Meyer E, Liu Z, Ouyang W.   +9 more
europepmc   +2 more sources

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

Lubricants
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
Fan-Bin Wu, Sheng-Jian Zhou, Jia-Hu Ouyang, Shu-Qi Wang, Lei Chen   +4 more
doaj   +2 more sources