Abstract
An ultrathin water film confined between two substrates in moving contact is studied using Langevin molecular dynamics with a coordinate- and velocity-dependent damping coefficient. The water molecules are modeled with the Central-Force model that allows for the dissociation of water molecules into H+ and OH–. Two different friction scenarios are found depending on the applied pressure and the strength of the interaction of water with substrates. Under low loads, the water molecules stay intact during the frictional sliding. However, when the applied pressure increases past a value of ∼20 GPa, the water molecules begin to dissociate and recombine immediately in the course of sliding, which results in a large increase of friction. The rate of such dissociation is found to be roughly proportional to the speed of driving. The relation of the observed phenomena to the “superionic” and “ionic fluid” states of water and its relevance in practical friction situations is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
