How does a droplet freeze on a superhydrophobic surface? The millisecond-scale processes of ice nucleation and crystal growth are extremely difficult to capture due to lens fogging and low contrast at low temperatures. In this study, we used a Qianyanlang high-speed camera at 3,000 fps with constant-temperature protection and fill light, shooting horizontally at the droplet-substrate interface. The results clearly resolve three stages: nucleation, lateral ice growth along the interface, and bulk freezing. This visualization reveals how superhydrophobic surfaces regulate droplet freezing, providing critical data and visual evidence for anti-icing material optimization and engineering applications.
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