Taiwan
When a droplet collides with a heterogeneous surface, the symmetry and force of deformations are determined by various linear and curvilinear patterns, inducing diverse motions such as splitting, bouncing, moving, and rotating. Building upon these observations, the "Droplet Motion Hypothesis" was proposed and successfully verified: when a water droplet is placed on a hydrophobic vibrating substrate with hydrophilic arc patterns, the continuous asymmetric deformation causes the droplet to move. This movement is found to be dependent on various parameters such as droplet size, amplitude, frequency, hydrophilic-hydrophobic linear and curvilinear patterns, substrate material, surface tension, viscosity, and sliding angle, etc. This study also attempted to control droplets to demonstrate phenomena such as circling, making right-angle turns, climbing slopes, descending slopes, and even the movement of "pendant" droplets. Finally, a comprehensive analysis of the droplet's shape and force was conducted, and a model was proposed to explain the findings.