Microtexturing of the Conductive PEDOT:PSS Polymer for Superhydrophobic Organic Electrochemical Transistors

Figure 6

The cartoon is a representation of a textured, superhydrophobic conductive polymer, where a millimetric drop would maintain a spherical shape, with convective flows herein generated due to the celebrated Marangoni effect. These flows of masses depend on the size of the drop and on its curvature, that is, on the angle of contact on the surface. Consequently, they may be controlled on controlling the geometry of the substrate. These extra noncontinuous scales are responsible for the velocity vector field in the solution domain. The displacement of a molecule in a solution would thus depend on the interplay of diffusion, convective flow, and evaporation. Controlling the relative contribution of these mechanisms to the displacement of a molecule would allow to separate different species on a quantitative basis.