Many Tribology Group publications are Open Access thanks to funding from the EPSRC.


BibTex format

author = {Mackowiak, S and Heyes, D and Pieprzyk, S and Dini, D and Branka, AC},
doi = {10.1002/pssb.201600862},
journal = {Physica Status Solidi B - Basic Solid State Physics},
title = {Non-equilibrium phase behavior of confined molecular films at low shear rates},
url = {},
volume = {254},
year = {2017}

RIS format (EndNote, RefMan)

AB - In a recent publication [Makowiak 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.
AU - Mackowiak,S
AU - Heyes,D
AU - Pieprzyk,S
AU - Dini,D
AU - Branka,AC
DO - 10.1002/pssb.201600862
PY - 2017///
SN - 0370-1972
TI - Non-equilibrium phase behavior of confined molecular films at low shear rates
T2 - Physica Status Solidi B - Basic Solid State Physics
UR -
UR -
VL - 254
ER -