Illinois Researchers Uncover New Frost Suppression Mechanism with Potential Engineering Applications
A team of researchers at the University of Illinois Urbana-Champaign, led by Professor Nenad Miljkovic, has discovered a new mechanism for frost propagation, termed the 'suspended ice bridge.' This finding, published in Nature Physics, challenges the traditional understanding of frost spreading, which was believed to occur along solid surfaces. The study reveals that on superhydrophobic surfaces, ice bridges can form suspended above the surface, connecting droplets through the air. This discovery was made using high-resolution optical microscopy and focal plane shift imaging. The research highlights that surface wettability is crucial in determining the growth mode of ice bridges, with a critical contact angle threshold identified. The suspended ice bridges grow slower due to reduced thermal coupling, significantly suppressing frost propagation. 
