Figure 4From: Micro-nano hybrid structures with manipulated wettability using a two-step silicon etching on a large area MNHS with micropillars using asher-mediated process. (a, b) top-view images; (c, d) tilted-view images. The width of a square micropillar and the inter-pillar distance (gap distance between pillars) are both 200 μm.Back to article page