(a) Critical drop volumes (V) as functions of the substrate tilt angles for the release (VREL), pinning (VPIN) and isotropic (VISO−;) directions; (b) the anisotropy strength, C0, (i.e., ratios of VPIN/VREL and VISO−/VISO+) as functions of stage tilt angle is shown. Schematic of nano-PPX rods with anisotropic (pinning, release) and isotropic (+, −) directions are defined in the inset. The error bars indicate the standard deviation. (c) Vibration frequency as a function of water droplet size for deformed nanoPPX film of P = 0.18MPa (θ = 24°); (d) droplet transport speed on deformed nanoPPX film (θ = 24°) as a functional of normalized vibration frequencies shows clustering of the data around the peak velocity.