Smooth superhydrophilic surfaces can still show droplet rebound when a thin intervening air film survives impact. Using experiments, simulations, and a scaling model, we show that the air-film lifetime—decreasing with impact inertia—governs three different regimes: bouncing (no rupture), partial bouncing (late rupture), and spreading (early rupture).

We experimentally map when impacting bubbles on heated surfaces rupture or bounce, quantifying the roles of surface temperature and bubble geometry. A scaling-based predictive model matches measurements, clarifying bubble-mediated transport and high-temperature coating processes.

We study how alcohol vapor can destabilize wetting films on solids. When a droplet sits above a thin water film, vapor-induced Marangoni stresses puncture a hole and drive dewetting. Using a high-speed camera, we develop and validate scaling laws that quantify the dewetting rate.