Figure 3.

(a) Schematic of evaporating drop. (b) Schematic of liquid meniscus (blue surface) and contact line (red line) in a unit cell of the surface microtexture. (c) Time evolution of drop radius, R, drop contact radius, R_C, and apparent contact angle, θ, for an evaporating drop. The four stages of evaporation, as observed in Figure 2, are also indicated. Definition of initial time t = 0 s is arbitrary. A repeat measurement is also shown in Supplementary Figure 1. (d) Experimental data compared to the law for diffusion-dominated evaporation, R ∝ (t₀ − t)^0.5. (e) Critical drop radius as function of , i.e. the advancing contact angle measured on the corresponding smooth surface.