RT Journal Article
T1 Ice friction at the nanoscale
T2 Fricción del hielo a escala nanoscópica
A1 Baran, Lukasz
A1 Llombart, Pablo
A1 Rzysko, Wojciech
A1 MacDowell, Luis G.
AB The origin of ice slipperiness has been a matter of great controversy for more than a century, but an atomistic understanding of ice friction is still lacking. Here, we perform computer simulations of an atomically smooth substrate sliding on ice. In a large temperature range between 230 and 266 K, hydrophobic sliders exhibit a premelting layer similar to that found at the ice/air interface. On the contrary, hydrophilic sliders show larger premelting and a strong increase of the first adsorption layer. The nonequilibrium simulations show that premelting films of barely one-nanometer thickness are sufficient to provide a lubricating quasi-liquid layer with rheological properties similar to bulk undercooled water. Upon shearing, the films display a pattern consistent with lubricating Couette flow, but the boundary conditions at the wall vary strongly with the substrate’s interactions. Hydrophobic walls exhibit large slip, while hydrophilic walls obey stick boundary conditions with small negative slip. By compressing ice above atmospheric pressure, the lubricating layer grows continuously, and the rheological properties approach bulk-like behavior. Below 260 K, the equilibrium premelting films decrease significantly. However, a very large slip persists on the hydrophobic walls, while the increased friction on hydrophilic walls is sufficient to melt ice and create a lubrication layer in a few nanoseconds. Our results show that the atomic-scale frictional behavior of ice is a combination of spontaneous premelting, pressure melting, and frictional heating.
PB National Academy of Sciences
SN 0027-8424, ESSN: 1091-6490
YR 2022
FD 2022-11-28
LK https://hdl.handle.net/20.500.14352/72742
UL https://hdl.handle.net/20.500.14352/72742
LA eng
NO Ministerio de Ciencia e Innovacion (MICINN)
NO Ministerio de Ciencia e Innovación (MICINN)
DS Docta Complutense
RD 6 abr 2025