Figure 1

(A) Snapshot of the system studied, comprising Janus particles in a semi infinite pool of water over a substrate or wall. The wettability is represented by the color coding for ease of viewing. (B–D) Simulation snapshots of the evolution of orientation of a single Janus particle as it approaches a non-wettable, a wettable, and a neutral substrate respectively, starting from an initial random orientation. To facilitate visualization, the water molecules are made invisible. The three frames in each column correspond to the snaps taken at 0 ns, 50 ns and 180 ns of the simulation run respectively. The third snapshot in each column (B3, C3 and D3) refers to the orientation of the particles after it has reached the substrate. The last images in each column (B4, C4 and D4) are FESEM images of the actual particles deposits after the solvent has fully evaporated away. The insets to these frames show the cross-sectional image to depict the orientation of the particles. The scale bar in each frame is 300 nm.