  The effect of temperature on friction and slip at the liquid-solid interface
has attracted attention over the last twenty years, both numerically and
experimentally. However, the role of temperature on slip close to the glass
transition has been less explored. Here, we use molecular dynamics to simulate
a bi-disperse atomic fluid, which can remain liquid below its melting point
(supercooled state), to study the effect of temperature on friction and slip
length between the liquid and a smooth apolar wall, in a broad range of
temperatures. At high temperatures, an Arrhenius law fits well the temperature
dependence of viscosity, friction and slip length. In contrast, when the fluid
is supercooled, the viscosity becomes super-Arrhenian, while interfacial
friction can remain Arrhenian or even drastically decrease when lowering the
temperature, resulting in a massive increase of the slip length. We rationalize
the observed superlubricity by the surface crystallization of the fluid, and
the incommensurability between the structures of the fluid interfacial layer
and of the wall. This study calls for experimental investigation of the slip
length of supercooled liquids on low surface energy solids.

Soft Condensed Matter