Investigation of tribological properties of nanostructured objects on atomic-smooth surfaces
DOI:
https://doi.org/10.15407/dopovidi2018.11.040Keywords:
atomically flat surfaces, dry friction, friction coefficient, friction sliding force, monolayer filmsAbstract
A fundamentally new method for the study of the friction in a point contact with the help of a pendulum levitated in a magnetic field has been developed and tested. The main advantage of the method is non-destructive regimes of measurements for the ultrathin (e.g., monolayers) lubricant films. The method allows us to provide fast measurements of friction coefficients in regimes of dry friction and in the presence of a lubricant film. Self-assembled monolayers of n-alkanes n-CnH2n+2 (n = 24 tetracosan, and n = 48, octatetracontan) deposited on the atomic-smooth surfaces of highly oriented pyrolytic graphite (HOPG) are used for these purposes. The structure of monolayers is investigated, by using a scanning tunneling microscope (STM) with molecular resolution. The obtained results are explained in the frame of a simple one-dimensional model, which considers n-alkane chain adsorbed on the graphite substrate. Using this model, we have found that the sliding force acting on an n-alkane molecule depends on the molecular length in non-monotonic manner.
Downloads
References
Binnig, G., Quate, C. F. & Gerber, C. (1986). Atomic Force Microscope. Phys. Rev. Lett. 56. doi: https://doi.org/10.1103/PhysRevLett.56.930
Mate, C. M., McClelland, G. M., Erlandsson, R. & Chang, S. (1987). Atomic scale friction of a tungsten tip on a graphite surface. Phys. Rev. Lett. 59, 1942-1945. doi: https://doi.org/10.1103/PhysRevLett.59.1942
Mate, C.M. (1995). Atomic Scale Friction, in: B. Bhushan (Ed.), Handbook of Micro/Nano Trib., Boca Raton: CRC Press.
Serway, R. A. & Beichner, R. J. (2000). Physics for Scientists and Engineers. Saunders College Publishing, Orlando, FL, 5th Ed.
Denape, J. (2015). Third body concept and wear particle behavior in dry friction sliding conditions. Tribological aspects in modern aircraft industry. Trans. Tech. Pub., 640, pp. 1-12. doi: https://doi.org/10.4028/www.scientific.net/KEM.640.1
Rigaud, E., Perret-Liaudet, J., Belin, M., Joly-Pottuz, L. & Martin, J.-M. (2010). An original dynamic tribotest to discriminate friction and viscous damping. Trib. Inter. 43, pp. 320-329. doi: https://doi.org/10.1016/j.triboint.2009.06.011
Vasko, A. A., Braun, O. M., Marchenko, O. A. et al. (2018). Magnetic Levitation Tribometer: A Point-Contact Friction. Tribol. Lett. 66: 74. doi: https://doi.org/10.1007/s11249-018-1024-z
Askadskaya, L. & Rabe, J. P. (1992). Anisotropic molecular dynamics in the vicinity of order-disorder transitions in organic monolayers. Phys. Rev. Lett. 69(9), pp. 1395-1398. doi: https://doi.org/10.1103/PhysRevLett.69.1395
Marchenko, O. & Cousty, J. (2000). Molecule length-induced reentrant self-organization of alkanes in monolayers adsorbed on Au(111). Phys. Rev. Lett. 84, pp. 5363-5366. doi: https://doi.org/10.1103/PhysRevLett.84.5363
Marchenko, A. & Cousty, J. (2003). “Magic size'' effect in the packing of n-alkanes on Au(111): evidence of lowered sliding force for molecules with specific length. Wear, 254(10), pp. 941-944. doi: https://doi.org/10.1016/S0043-1648(03)00296-5
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2024 Reports of the National Academy of Sciences of Ukraine
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
