Wetting-driven structure formation of a binary mixture in the presence of a mobile particle pinning potential

We investigate the pattern formation on the solid substrate of phase-separa ting films containing mobile wetting particles with a preferential attracti on for one component of the mixtures. The presence of mobile particles unde r the surface-particle interaction modulation breaks the isotropy of the bu lk phase-separating process, leading to the formation of orientational stru cture due to the interplay between phase separation and wetting particle or dering under a modulated pinning potential at the late stage. Simulations s uggest that the phase-separation morphology can be changed through the adju stment of the wettable-phase-particle interaction and the surface-particle interaction. It provides some important insights into this "wetting-directe d spinodal decomposition.".