“…The roughness can be enhanced by constructing hierarchical micro-nano structure on the surface. For alumina, a variety of micro/nano structures including fibers, 23,24 rods, 25 tubes, 26 wires, 27 and sheets 2,28,29 have been synthesized, which could be converted into super-hydrophobic by modification with low-surface energy materials. 30 In this paper, we report for the first time the all-ceramic super-hydrophobic surface by modifying ceramic substrates with a polymer-derived ceramic coating.…”