2016/10/31 by Astrid S. de Wijn, Lars G. M. Pettersson
Chemistry · Engineering · Materials Science · Mathematics · Physics and Astronomy · #Asperity (geotechnical engineering) #Chemistry #Composite material #Computational chemistry #Context (archaeology) #Diamond and Carbon-based Materials Research #Force Microscopy Techniques and Applications #Geology #Geometry #Graphene #Graphite #Lubrication #Materials science #Mathematics #Mechanics #Molecular dynamics #Nanopore and Nanochannel Transport Studies #Nanotechnology #Physics #Range (aeronautics) #Square (algebra) #Thermal #Thermodynamics #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.95.165433
published as Phys. Rev. B 95, 165433 (2017) · 7 pages, 5 figures
arxiv created 2017/03/31 · openalex publication_date 2017/04/19 · arxiv updated 2017/04/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In the context of friction we use atomistic molecular-dynamics simulations to investigate water confined between graphene sheets over a wide range of pressures. We find that thermal equilibration of the confined water is hindered at high pressures. We demonstrate that, under the right conditions, square ice can form in an asperity, and that it is similar to cubic ice VII and ice X. We simulate sliding of atomically flat graphite on the square ice and find extremely low friction due to structural superlubricity. The conditions needed for square ice to form correspond to low sliding speeds, and we suggest that the ice observed in experiments of friction on wet graphite is of this type.