Fig. 1. Preparation of SCGA structure and its function of directional water droplet transport driven by vertical vibration. (a) SCGA surface preparation process; (b) directional high-speed transport of a water droplet on the SCGA surface;(c) SEM images show top and side views of SCGA

Fig. 2. Analysis of the kinetic mechanism of the droplet transport. (a) Wetting and dewetting states of the droplet during one period of vibration; (b) force analysis of the droplet in the corresponding state shown in Fig.(a); (c)(d) schematic diagrams of the force analysis when the droplet starts to slide along the y and -y directions, respectively

Fig. 3. Regulation of droplet transport capability. (a) Control of oil film thickness by adjusting the spin coating time, thereby regulating droplet transport capability; (b) droplet states on the sample surface with thin and thick oil films; (c) effect of vibration frequency on droplet transport at an vibration amplitude of V_pp=20 V; (d) effect of vibration amplitude on droplet transport at a vibration frequency of 45 Hz

Fig. 4. Microchemical reaction based on vertical vibration driven droplet directional transport