Figure 4
From: Electrotunable Lubricity with Ionic Liquid Nanoscale Films

Lateral order in ionic layers between equally charged surfaces.
Structure factors Sm(k) for the first three IL layers calculated for three indicated values of surface charge density, qs: −16 μC/cm2, −32 μC/cm2 and −128 μC/cm2. Increase of the surface charge induces inncommensurate-to-commensurate transition in the first layer.