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Non‐Equilibrium Phase Behavior of Confined Molecular Films at Low Shear Rates
Author(s) -
Maćkowiak Szymon,
Heyes David M.,
Pieprzyk Slawomir,
Dini Daniele,
Brańka Arkadiusz C.
Publication year - 2017
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600862
Subject(s) - phase diagram , slip (aerodynamics) , prandtl number , mechanics , kinetic energy , thermodynamics , static friction , molecular dynamics , shear (geology) , materials science , work (physics) , physics , phase (matter) , classical mechanics , composite material , heat transfer , quantum mechanics
In a recent publication [Maćkowiak et al., J. Chem. Phys. 145, 164704 (2016)] the results of Non‐Equilibrium Molecular Dynamics (NEMD) simulations of confined sheared Lennard‐Jones molecular films have been presented. The present work builds on that study by focusing on the low wall speed (shear rate) regime. Maps are given of the steady‐state structures and corresponding friction coefficients in the region where a transition from static to kinetic friction is observed. The boundary between static and kinetic friction regions is determined as a function of wall speed and applied pressure, which is located for wall speeds up to about 0.8 m s −1 . It was found that stick‐slip behavior extends to pressures as high as 1000 MPa. The NEMD equations of motion are shown to be consistent with the Prandtl–Tomlinson model in the ‘soft spring’ limit, which leads to a new expression for the friction coefficient. This study provides new details and insights into the nature of anomalous friction behavior in the so‐called Plug‐Slip part of the nonquilibrium phase diagram regime.