  Ordered binary and ternary photonic crystals, composed of different sized
polymer-composite spheres with diameter ratios up to 120%, are generated using
bending induced oscillatory shearing (BIOS). This viscoelastic system creates
polydisperse equilibrium structures, producing mixed opaline colored films with
greatly reduced requirements for particle monodispersity, and very different
sphere size ratios, compared to other methods of nano-assembly.
