Video of a water droplet spreading quickly on a surface of connected, re-entrant cavities. The droplet reaches an unmeasurably low contact angle (< 5°) within 1 s of deposition due to rapid cavity filling. The blurry particulates on the surface (left of the droplet) were not within the droplet contact area.
Dongjin Seo, Alex M. Schrader, Szu-Ying Chen, Yair Kaufman, Thomas R. Cristiani, Steven H. Page, Peter H. Koenig, Yonas Gizaw, Dong Woog Lee, and Jacob N. Israelachvili
PNAS. 2018. 115:8070-8075 DOI: 10.1073/pnas.1804437115