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Information × Registration Number 0215U000507, 0112U001380 , R & D reports Title Modeling of friction of metal nanoparticles and boundary liquid films which interact with atomically flat surfaces popup.stage_title Head Khomenko Oleksii, Registration Date 27-02-2015 Organization Sumy State University popup.description2 The object of investigation is ultrathin lubricant film confined between two atomically smooth solid surfaces, metal nanoparticles and graphene. The aim of research is to build thermodynamic models of ultrathin lubricant film melting, investigate tribological system behavior based on those models, study of friction of metal nanoparticles on graphene. The methodology used in the study is methods of the theory of phase transitions and elasticity theory, methods of computational mathematics and molecular dynamics. In presence of interaction forces between two blocks surfaces the trajectory and velocity of the top block has been considered. Bottom block is fixed between two springs, and top one moves periodically. The kinetic dependences of elastic stresses, friction force in presence of first-order phase transitions in system have been calculated based on explicit form of Landau-Khalatnikov relaxation equation. Thus, the interrupted (stick-slip) mode has been described, which is observed experimentally. The friction of Ni, Ag, Cu and Au nanoparticles (NPs), adsorbed on graphene, has been studied based on the method of classical molecular dynamics. NPs contained from 5000 to 30000 atoms have been investigated. Dependences of the substrate friction force on the lateral component of position of the center of mass for all Cu and most of Ni NPs have sawtooth shape. For gold NPs dependences of two types are observed: nonhomogeneous and sawtooth. For Ag NPs friction force has irregular shape. Product Description popup.authors Барило Неля Іванівна Борисюк Вадим Миколайович Заскока Антон Миколайович Ковальов Богдан Леонідович Люльов Олексій Валентинович Ляшенко Яків Олександрович Фалько Віра Володимірівна Ющенко Ольга Володимірівна popup.nrat_date 2020-04-02 Close