Results 11 to 20 of about 2,518 (204)

Origins of Graphite Resistivity: Decoupling Stacking Fault and Rotational Misorientation. [PDF]

Adv Sci (Weinh)
Interfacial dislocations critically influence interlayer transport in van der Waals (vdW) materials, yet quantifying their individual contributions remains challenging. We measure graphite's c‐axis resistivity and develop a decoupling strategy, revealing a resistivity ratio of ∼4507:74:1 for rotational misorientations, stacking faults, and AB stacking,
Chen W, Yang F, Wu T, Wang Y, Zheng Q, Peng D, Wu Z.   +6 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

Superlubric Polycrystalline Graphene Interfaces [PDF]

Nature Communications, 2021
Abstract The effect of corrugated grain boundaries on the frictional properties of extended graphitic contacts incorporating a polycrystalline surface are investigated. The friction is found to be dominated by shear induced buckling and unbuckling of corrugated grain boundary dislocations, leading to a nonmonotonic behavior of friction with ...
Xiang Gao, Wengen Ouyang, Michael Urbakh, Oded Hod   +3 more
openaire   +4 more sources

Superlubric Graphullerene. [PDF]

Nano Lett
Graphullerene (GF), an extended quasi-two-dimensional network of C60 molecules, is proposed as a multicontact platform for constructing superlubric interfaces with layered materials. Such interfaces are predicted to present very small and comparable sliding energy corrugation regardless of the identity of the underlying flat layered material surface ...
Ying P, Hod O, Urbakh M.
europepmc   +3 more sources

Editorial: Superlubricity across the scales. [PDF]

Front Chem, 2022
Article talks about how while the idea of frictionless surfaces and the associated implications of vanishing energy losses during mechanical motion have been part of science fiction culture, scientists in the real world work toward realizing this ambitious goal that was once thought to be unattainable.
Baykara MZ, Berman D, Rosenkranz A.
europepmc   +6 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

Contacts With Negative Work of “Adhesion” and Superlubricity [PDF]

, 2020
Van der Waals forces between solids in vacuum are always attractive and are considered as the main source of adhesion. However, in the presence of an intermediate medium, they can also be repelling (Dzyaloshinskii et al., 1961) which means that the “work
Popov, Valentin L.
core   +1 more source

Superlubricitive engineering—Future industry nearly getting rid of wear and frictional energy consumption

Friction, 2020
Superlubricity has been developing very rapidly in recent years as a new and important area in tribology. Many new phenomena and materials, as well as some new mechanisms in both liquid and solid superlubricity have been obtained.
Jianbin Luo, Xiang Zhou
doaj   +1 more source

Rotational Instability in Superlubric Joints [PDF]

Physical Review Letters, 2019
Surface and interfacial energies play important roles in a number of instability phenomena in liquids and soft matters, but are rare to play a similar role in solids. Here we report a new type of mechanical instabilities that are controlled by surface and interfacial energies and are valid for a large class of materials, in particular two-dimensional ...
Cangyu, Qu, Songlin, Shi, Ming, Ma, Quanshui, Zheng   +3 more
openaire   +3 more sources

Superlubricity of Graphite

Physical Review Letters, 2004
Using a home-built frictional force microscope that is able to detect forces in three dimensions with a lateral force resolution down to 15 pN, we have studied the energy dissipation between a tungsten tip sliding over a graphite surface in dry contact.
Dienwiebel, M., Verhoeven, G. S., Pradeep, N., Frenken, J. W. M., Heimberg, J. A., Zandbergen, H. W.   +5 more
openaire   +5 more sources