scholarly journals Thermally Activated Contact Strengthening Explains Nonmonotonic Temperature and Velocity Dependence of Atomic Friction

2013 ◽  
Vol 3 (4) ◽  
Author(s):  
Mykhaylo Evstigneev ◽  
Peter Reimann
Keyword(s):  
Velocity Dependence ◽  
Thermally Activated ◽  
Atomic Friction

Nonmonotonic Velocity Dependence of Atomic Friction

2004 ◽  
Vol 93 (23) ◽  
Author(s):  
Peter Reimann ◽  
Mykhaylo Evstigneev
Keyword(s):  
Velocity Dependence ◽  
Atomic Friction

scholarly journals Non-Monotonic Velocity Dependence of Atomic Friction

2010 ◽  
Vol 39 (3) ◽  
pp. 229-233 ◽  
Author(s):  
Enzo Granato ◽  
S. C. Ying
Keyword(s):  
Velocity Dependence ◽  
Atomic Friction

Thermally activated phenomena observed by atomic force microscopy

2003 ◽  
Vol 790 ◽  
Author(s):  
Enrico Gnecco ◽  
Elisa Riedo ◽  
Roland Bennewitz ◽  
Ernst Meyer ◽  
Harald Brune
Keyword(s):  
Thermal Effects ◽  
Thermal Activation ◽  
Velocity Dependence ◽  
Stick Slip ◽  
Force Microscopy ◽  
Thermally Activated ◽  
Atomic Force ◽  
Stick Slip Motion ◽  
Thermal Vibrations

ABSTRACTThermal effects may affect the velocity dependence of friction on the nanoscale in different ways. In a dry environment the stick-slip motion of a nanotip sliding across a crystalline surface is modified by thermal vibrations, which leads to a logarithmic increase of friction with the sliding velocity at very low speeds (v < 10 μm/s). At higher speeds the role of thermal activation is negligible, and friction becomes velocity-independent. An analytical expression, which explains both regimes of friction vs. velocity, is introduced. In a humid environment the situation is complicated by water capillaries formed between tip and surface, which act as obstacles for thermally activated jumps. Depending on the wettability of the surface, different tendencies in the velocity dependence are observed.

Velocity Dependence of Atomic Friction

2000 ◽  
Vol 84 (6) ◽  
pp. 1172-1175 ◽  
Author(s):  
E. Gnecco ◽  
R. Bennewitz ◽  
T. Gyalog ◽  
Ch. Loppacher ◽  
M. Bammerlin ◽  
...  
Keyword(s):  
Velocity Dependence ◽  
Atomic Friction

Thermally activated flow of β-titanium and β-titanium-hydrogen alloys

2000 ◽  
Vol 80 (12) ◽  
pp. 2813-2825
Author(s):  
O. N. Senkov, J. J. Jonas, F. H. Froes
Keyword(s):  
Thermally Activated

Solvent Dependence of Structural Dynamics and Spin-flip Processes in 3,4,5-tri(9H-carbazole-9-yl)benzonitrile (ortho-3CzBN)

2020 ◽  
Author(s):  
Masaki Saigo ◽  
Kiyoshi Miyata ◽  
Hajime Nakanotani ◽  
Chihaya Adachi ◽  
Ken Onda
Keyword(s):  
Dft Calculations ◽  
Excited States ◽  
Structural Changes ◽  
Photophysical Properties ◽  
Delayed Fluorescence ◽  
Time Resolved ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Solvent Dependence ◽  
Acetonitrile Solutions

We have investigated the solvent-dependence of structural changes along with intersystem crossing of a thermally activated delayed fluorescence (TADF) molecule, 3,4,5-tri(9H-carbazole-9-yl)benzonitrile (o-3CzBN), in toluene, tetrahydrofuran, and acetonitrile solutions using time-resolved infrared (TR-IR) spectroscopy and DFT calculations. We found that the geometries of the S1 and T1 states are very similar in all solvents though the photophysical properties mostly depend on the solvent. In addition, the time-dependent DFT calculations based on these geometries suggested that the thermally activated delayed fluorescence process of o-3CzBN is governed more by the higher-lying excited states than by the structural changes in the excited states.<br>

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