Figure 2 - Particles arranged on printing plates after inking.

Gold particles were assembled in poly(dimethylsiloxane) templates by hydrodynamic and surface forces. a, AFM topography and b, SEM micrographs of 60-nm Au monodispersed particles arranged in u-grooves of different widths, and one u-groove (bottom) filled with polydispersed particles. c, Larger areas of multiple, densely spaced lines have also been filled, for example 150-nm lines with 60-nm Au particles. d, AFM topography of 200-nm spaced array of 100-nm Au particles. e, 1-m-spaced array of 60-nm Au particles. f, Bright-field optical micrograph of a sun composed of approximately 20,000 individual 60-nm Au particles.