“…This is due to the generation of airflow vortices, increasing the droplet falling speed. 55 Meanwhile, the weight of collected water of the concave surface with a diameter of 50 and 60 mm is similar. Furthermore, a SSH-patterned surface with lengths of 60, 70, and 80 mm and a width of 50 mm, respectively, is rolled into cylindrical shape for water collection, as displayed in Figure 7a.…”