Fig. 2.

(A) Possible contact angles as a function of relative surface tensions ${\sigma }_{i,j}$. Wetting occurs if any surface tension dominates the other two (the Top, Left, and Right subtriangles of ternary diagram). (B) Example minimal energy configurations for varying surface tensions ${\sigma }_{i,j}$ (horizontal axis) and relative concentrations $c_1/c_2$ (vertical axis). Surface tensions are chosen so that ${\theta }_2={20}^{°}$. The surface tensions of each column are indicated in the ternary plot with stars shifting from green (${\sigma }_{1,2}\approx 0.5$) to red (${\sigma }_{2,3}\approx 0.5$). (C) The free energy used in simulations of experiments. The maximum is located at the black circle. The energy is more sensitive to $c_3$ than $c_1$ or $c_2$.