Fig. 4
From: Spontaneous droplets gyrating via asymmetric self-splitting on heterogeneous surfaces
Exploitation of pinning forces for various droplet actuation. a Effect of the size-commensuration, rotational symmetry, and mirror symmetry of the adhesion pattern under the droplet maximum spreading on the impacting behaviors. b The droplet upward bounces with gyration after impacting on a low-adhesive surface with high-adhesive arcs that has rotational symmetry but no mirror symmetry. c A droplet deflects and rolls after impacting on a low-adhesive surface with a high-adhesive arc that is mirror symmetric but not rotationally symmetric. d The droplet bounces vertically upward after impacting on a low-adhesive surface with high-adhesive circular segments that are rotationally and mirror symmetric. e A droplet gyrates, rolls, and deflects after impacting on a low-adhesive surface with a high-adhesive Archimedean spiral segment that is asymmetric. The schemes of the patterns are given in the first column of b–e, in which the dashed circles represent the maximum spreading boundaries of the droplets. The scale bars are 1 mm
