Ice Forms Vapor Barrier on Hot Surface in Nanoseconds

Scientists have captured a new ice‑related analogue of the well‑known Leidenfrost effect, observing ice crystals glide over an extremely hot surface on a scale of nanometers and within nanoseconds. In the classic phenomenon, a water droplet skitters across a pan because a vapor layer forms between the liquid and the metal. The latest experiments, conducted by researchers at the Institute for Advanced Materials, demonstrate that a thin layer of ice can similarly levitate and move over a surface heated to several hundred degrees Celsius, but the interaction occurs at the molecular level and is fleeting.

Using ultrafast laser diagnostics and high‑resolution scanning probe microscopy, the team measured the separation between the ice and the metal substrate to be only a few nanometers. The ice remained suspended for a few nanoseconds before sublimating, revealing a transient vapor cushion that reduces friction and allows rapid motion. The study shows that the thermal gradient and surface roughness play critical roles in sustaining this nanoscopic levitation, offering new insights into ice–surface interactions that are relevant for cryogenic engineering, high‑temperature coatings, and the design of heat‑transfer devices.

The discovery opens avenues for controlling ice formation and removal in extreme environments, such as aerospace or power‑generation systems, where rapid ice sublimation could improve efficiency and safety. Further research will explore how varying surface chemistry and temperature affect the longevity of the vapor layer, potentially leading to novel anti‑icing technologies that operate at the nanoscale.