Bouncing water droplets off surfaces even faster

This video shows the contact time differences on three different superhydrophobic surfaces (micropillar array, control surface, and macrotextured surface) with the side views of water droplet impingement. All surfaces were made of silicon. While the micopillar array takes the longest (18.0 ms) to repel the impinging water droplet, the control surface takes much shorter contact time (12.4 ms) due to minimal pinning, representing the theoretical minimum contact time under these conditions. The surface with designed macrotexture however goes even beyond the theoretical limit by repelling the impinging droplet in a mere 7.8 ms. Credit: James C. Bird, Rajeev Dhiman, Hyuk-Min Kwon, Kripa K. Varanasi