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The video exhibits experimental qualitative and quantitative results ofwater/glycerol (50%/50% by mass) droplet impact on two types of micro-patternedsuperhydrophobic surfaces. The two types of surfaces used were 80% cavityfraction ribs and posts with a periodic spacing of 40 {\mu}m and 32 {\mu}m,respectively. All surfaces were manufactured through photolithography. Theimpact Weber number is used as the dynamic parameter to compare splash andrebound behaviors between the two types of surfaces. While droplets exhibitsimilar dynamics at low Weber numbers, rebound jet speed (normalized by dropletimpact speed) is notably higher on posts than ribs for all Weber numbers testedhere (5<We<900). At elevated Weber numbers, droplets splash peripherally. Theseside droplets created at splash are referred to as satellite droplets. Top viewvideos show the significant difference in splashing behavior for the twosurface types. On ribs, satellite droplet formation consistently prefers a path60{\deg} from the ribs longitudinal direction. This behavior prevails for Webernumbers greater than 150, however, distinguished splashing does not occur forWe > 265. On posts, satellite droplets also follow a specific path but in adifferent orientation. Satellite droplets form in locations aligned with thepost lattice structure. This behavior is observed for 600 < We < 750. Jetrebound exhibits an interesting phenomenon on ribs under certain conditions.Due to the uneven shear distribution on the retracting droplet due to thesurface anisotropy, two jets form at rebound and are referred to as two-prongedjets. This behavior occurs for 115 < We < 265 on ribs. Two-pronged jets arealso observed on posts but are less coherent and less repetitive. This behaviorwas observed at around 500 < We < 600.

Liquid Droplet Impact Dynamics on Micro-Patterned Superhydrophobic Surfaces