Scratch-Healing Behavior of Ice by Local Sublimation and Condensation

We show that the surface of ice is scratch healing: micrometer-deep scratches in the ice surface spontaneously disappear by thermal relaxation on the time scale of roughly an hour. Following the dynamics and comparing it to different mass transfer mechanisms, we find that sublimation from and condensation onto the ice surface is the dominant scratch-healing mechanism. The scratch-healing kinetics shows a strong temperature dependence, following an Arrhenius behavior with an activation energy of Delta E = 58.6 +/- 4.6 kJ/mol, agreeing with the proposed sublimation mechanism and at odds with surface diffusion or fluid flow or evaporation-condensation from a quasi-liquid layer.

Automated summary

The surface of ice has scratch healing ability, where micrometer-deep scratches spontaneously disappear by thermal relaxation within approximately an hour. Sublimation from and condensation onto the ice surface are found to be the dominant scratch-healing mechanism. The scratch-healing kinetics shows a strong temperature dependence, consistent with the proposed sublimation mechanism.