scholarly journals Friction Anisotropy of MoS2: Effect of Tip–Sample Contact Quality

2020 ◽  
Vol 11 (16) ◽  
pp. 6900-6906 ◽  
Author(s):  
Mohammad R. Vazirisereshk ◽  
Kathryn Hasz ◽  
Robert W. Carpick ◽  
Ashlie Martini
Keyword(s):  
Friction Anisotropy

scholarly journals Getting grip in changing environments: the effect of friction anisotropy inversion on robot locomotion

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
Halvor T. Tramsen ◽  
Lars Heepe ◽  
Jettanan Homchanthanakul ◽  
Florentin Wörgötter ◽  
Stanislav N. Gorb ◽  
...  
Keyword(s):  
Energy Efficient ◽  
Legged Locomotion ◽  
Hexapod Robot ◽  
Friction Anisotropy ◽  
Anisotropic Friction ◽  
Walking Behavior ◽  
Robot Locomotion ◽  
Computational Morphology ◽  
Anisotropic Structures ◽  
Walking Environment

AbstractLegged locomotion of robots can be greatly improved by bioinspired tribological structures and by applying the principles of computational morphology to achieve fast and energy-efficient walking. In a previous research, we mounted shark skin on the belly of a hexapod robot to show that the passive anisotropic friction properties of this structure enhance locomotion efficiency, resulting in a stronger grip on varying walking surfaces. This study builds upon these results by using a previously investigated sawtooth structure as a model surface on a legged robot to systematically examine the influences of different material and surface properties on the resulting friction coefficients and the walking behavior of the robot. By employing different surfaces and by varying the stiffness and orientation of the anisotropic structures, we conclude that with having prior knowledge about the walking environment in combination with the tribological properties of these structures, we can greatly improve the robot’s locomotion efficiency.

Friction Anisotropy-Driven Domain Imaging on Exfoliated Monolayer Graphene

Science ◽  
2011 ◽  
Vol 333 (6042) ◽  
pp. 607-610 ◽  
Author(s):  
J. S. Choi ◽  
J.-S. Kim ◽  
I.-S. Byun ◽  
D. H. Lee ◽  
M. J. Lee ◽  
...  
Keyword(s):  
Monolayer Graphene ◽  
Friction Anisotropy

T0301-2-1 Friction Anisotropy of a Thin Film Comprised of Oblique Nano-Columns

2009 ◽  
Vol 2009.8 (0) ◽  
pp. 45-46
Author(s):  
Hiroyuki HIRAKATA ◽  
Taku NISHIHIRA ◽  
Kohji MINOSHIMA
Keyword(s):  
Thin Film ◽  
Friction Anisotropy

scholarly journals Friction anisotropy at Ni(100)/(100) interfaces: Molecular dynamics studies

2002 ◽  
Vol 66 (8) ◽  
Author(s):  
Yue Qi ◽  
Yang-Tse Cheng ◽  
Tahir Çağin ◽  
William A. Goddard
Keyword(s):  
Molecular Dynamics ◽  
Friction Anisotropy

scholarly journals Friction anisotropy: A unique and intrinsic property of decagonal quasicrystals

2008 ◽  
Vol 23 (5) ◽  
pp. 1488-1493 ◽  
Author(s):  
Jeong Young Park ◽  
D.F. Ogletree ◽  
M. Salmeron ◽  
C.J. Jenks ◽  
P.A. Thiel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Film ◽  
Atomic Force Microscope ◽  
Atomic Structure ◽  
Intrinsic Property ◽  
Friction Anisotropy ◽  
Nanometer Size ◽  
Atomic Force ◽  
Decagonal Quasicrystals ◽  
Pin On Disk

We show that friction anisotropy is an intrinsic property of the atomic structure of Al–Ni–Co decagonal quasicrystals and not only of clean and well-ordered surfaces that can be prepared in vacuum [J.Y. Park et al., Science309, 1354 (2005)]. Friction anisotropy is manifested in both nanometer-size contacts obtained with sharp atomic force microscope tips and macroscopic contacts produced in pin-on-disk tribometers. We show that the friction anisotropy, which is not observed when an amorphous oxide film covers the surface, is recovered when the film is removed due to wear. Equally important is the loss of the friction anisotropy when the quasicrystalline order is destroyed due to cumulative wear. These results reveal the intimate connection between the mechanical properties of these materials and their peculiar atomic structure.

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