Atomistic modeling of tribological properties of ultrathin layer of carbon disulfide between diamond surfaces 
Boyko D.V., Khomenko A.V.
Sumy State University, 2 Rimsky Korsakov Str., Sumy, 40007, Ukraine 
E-mail: ramle2009@gmail.com

The development of wear-resistant surfaces with low friction and thin lubricating films has become an important factor in the miniaturization of moving parts in many technical devices [1, 2]. The latter include microelectromechanical systems, computer storage systems, miniature engines and so on. 
The calculations were carried out for plane Couette flow geometry [3], which resembles the experimental systems investigated by the surface forces apparatus. An ultrathin film of carbon disulfide was considered, bounded by two solid diamond walls with periodic boundary conditions in the plane of the plates applied to both the liquid and the surfaces. Atomically-smooth and periodic relief plates were studied. To simplify the task, the plates are considered to be absolutely rigid, and the model does not include the elasticity of the surfaces. 
The behavior of the friction force, kinetic and total energies is simulated. It can be concluded from the study that the linear increase in the friction force with the load is determined not by the relief of the surfaces, but by their elasticity. This is explained by the rapid achievement of the saturation of the friction force with an increase in the load for all the models considered. Fluctuations of kinetic energy significantly increase the amplitude during the loading on the surface, this indicates an increase in the temperature of the liquid molecules. The dependences of shear stresses on the load obtained in the models show similarities with the experimental dependences for simple spherical molecules.

1.	E. Gnecco and E. Meyer (Eds.) // Fundamentals of Friction and Wear on the Nanoscale, Springer, Berlin (2007). 
2.	T. Marx, X. Shen, D. Dietzel, and A. Schirmeisen // Langmuir, 33 (24), 6005 (2017).
3.	A.V. Khomenko, N.V. Prodanov, Condens. Matter Phys., 11, No. 4, 615 (2008).