Results 11 to 20 of about 2,282 (146)

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

Static and dynamic friction in sliding colloidal monolayers [PDF]

, 2012
In a pioneer experiment, Bohlein et al. realized the controlled sliding of two-dimensional colloidal crystals over laser-generated periodic or quasi-periodic potentials.
A. Vanossi, Bohlein, Bohlein, Bruschi, Bruschi, Carpick, Castelli, Cieplak, Coffey, Dienwiebel, E. Tosatti, Filippov, Krim, Lomdahl, Mangold, Mikhael, N. Manini, Reichhardt, Reichhardt, Rubinstein, Urbakh, Vanossi, Vanossi, Vanossi   +23 more
core   +1 more source

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

Modeling friction: From nanoscale to mesoscale [PDF]

, 2013
The physics of sliding friction is gaining impulse from nanoscale and mesoscale experiments, simulations, and theoretical modeling. This Colloquium reviews some recent developments in modeling and in atomistic simulation of friction, covering open-ended ...
Manini, Nicola, Tosatti, Erio, Urbakh, Michael, Vanossi, Andrea, Zapperi, Stefano   +4 more
core   +2 more sources

Structural lubricity under ambient conditions. [PDF]

, 2016
Despite its fundamental importance, physical mechanisms that govern friction are poorly understood. While a state of ultra-low friction, termed structural lubricity, is expected for any clean, atomically flat interface consisting of two different ...
Baykara, Mehmet Z, Cihan, Ebru, Durgun, Engin, İpek, Semran   +3 more
core   +1 more source

Superlubricity through graphene multilayers between Ni(111) surfaces [PDF]

, 2013
A single graphene layer placed between two parallel Ni(111) surfaces screens the strong attractive force and results in a significant reduction of adhesion and sliding friction.
Cahangirov, S., Ciraci, S., Özçelik, V. Ongun   +2 more
core   +2 more sources

Torque and Twist against Superlubricity

Physical Review Letters, 2008
Superlubricity between incommensurate surfaces provides a desired low-friction state essential for the function of small-scale machines. Here we demonstrate experimentally and theoretically that superlubricity in contacts lubricated by lamellar solids might be eliminated due to torque-induced reorientation coupled to lateral motion.
Filippov, D.V., Dienwiebel, M., Frenken, J.W.M., Klafter, J., Urbakh, M.   +4 more
openaire   +6 more sources

Predicting the lifetime of superlubricity [PDF]

EPL (Europhysics Letters), 2015
The concept of superlubricity has recently called upon notable interest after the demonstration of ultralow friction between atomistically smooth surfaces in layered materials. However, the energy dissipation process conditioning the sustainability of superlubric state has not yet been well understood.
Wang, A.L., He, Q.-C., Xu, Z.P.
openaire   +3 more sources

Gas-Phase Lubrication of ta-C by Glycerol and Hydrogen Peroxide. Experimental and Computer Modeling [PDF]

, 2010
Tetrahedrally coordinated hydrogen-free amorphous diamond-like carbon coating (denoted as ta-C) presents ultralow friction under boundary lubrication conditions at 80 °C in presence of OH-containing molecules.
De Barros Bouchet, Maria-Isabel, Goddard, William A., III, Martin, Jean-Michel, Matta, Christine, Okuda, Sachiko, Sagawa, Takumaru, Zhang, Qing   +6 more
core   +1 more source

Superlubricity - a new perspective on an established paradigm

, 2012
Superlubricity is a frictionless tribological state sometimes occurring in nanoscale material junctions. It is often associated with incommensurate surface lattice structures appearing at the interface.
G. A. Tomlinson, I. L. Singer, M. H. Müser, M. O. Robbins, Oded Hod, W. H. Bragg, Y. I. Frenkel   +6 more
core   +1 more source