Figure 1.

(a) Schematic illustration of the roll-on-plate geometry to form gradient stripe patterns by the solvent evaporation and controlled flow of PMMA solution. (b) Solvent evaporation of receding meniscus, dragged by a shear force, in confined geometry. (c) A cross-sectional view of cyclic stick-slip motions at the edge of the contact line, balanced with the capillary force and surface tension on a flat substrate. (d) Representative optical micrograph of highly ordered PMMA hierarchical stripes formed over a large area, perpendicular to the direction of the moving meniscus. Patterned stripes of PMMA in nanoscale at the final stage of the process (inset).