Superhydrophobic Surfaces Slowed Frost Growth
Researchers identified a suspended ice-bridging mechanism that significantly delays frost formation on heat exchangers.
Updated on Sept. 24, 2026 in Materials Science
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Researchers have discovered that superhydrophobic surfaces can slow frost spread by up to 85 percent by forcing ice bridges to form in mid-air rather than on the surface. This research-stage finding was documented in the September 2026 issue of Nature Physics.
Why it matters
By delaying the onset of frost, this mechanism enables heat exchangers to maintain efficient operation for significantly longer periods in cold conditions. This finding suggests a new design pathway for enhancing the thermal performance of hardware in freezing environments.
Testing revealed that when droplet contact angles exceed 105 degrees, ice bridges form in mid-air at a thickness of approximately 3 microns. Above 110 degrees, over 90 percent of these bridges are suspended, slowing growth as they are surrounded by warmer air rather than the cold surface.
The players
University of Illinois Urbana-Champaign
An academic institution with an extensive research portfolio in mechanical engineering, thermal sciences, and advanced surface materials.
The details
The team used high-resolution focal plane shift imaging—a technique that captures objects at specific depths to create 3D maps—to determine that ice bridges exist at different heights than the substrate. In wind tunnel tests at -10 degrees Celsius, they applied these coatings to finned-tube heat exchangers to observe the suppression of ice nucleation. The material enables coalescence-induced jumping, where droplets merge and propel themselves off the surface, further limiting frost buildup.
Timeline
September 2026: The findings were published in Nature Physics.
The Tech Race
This research follows a pattern set by the University of Illinois Urbana-Champaign frost suppression research program to improve energy efficiency in HVAC systems. It provides a distinct mechanism that clarifies how surface-level coatings can physically outperform standard hydrophilic heat exchanger materials.
This development identifies a technical path to extending the duration of high heat transfer in cold-weather equipment by up to 90 minutes. While currently at the research stage, the findings provide a specific design threshold for manufacturers looking to improve the resilience of heat exchangers.
The takeaway
The research highlights that the physical positioning of ice bridges is a critical variable in thermal efficiency. Future testing will likely focus on whether these performance gains hold up when coatings are subjected to the repeated freeze-thaw cycles of long-term real-world industrial use.
Further reading
For broader context on how advanced materials are changing energy efficiency, visit Materials Science.
Source note: This article includes information reported by Asme.
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