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Colloidal crystals exhibit structural color without any color pigment due tothe crystals' periodic nanostructure, which can interfere with visible light.This crystal structure is iridescent as the resulting color changes with theviewing or illumination angle, which limits its use for printing or displays.To eliminate the iridescent property, it is important to make the packing ofthe colloidal nanoparticles disordered. Here, we introduce a drop-castingmethod where a droplet of a water- ethanol mixture containing monodispersepolymer-coated silica nanoparticles creates a relatively uniform andnon-iridescent deposit after the droplet evaporates completely on a heatedsubstrate. The uniformity is caused by a thermal Marangoni flow and fastevaporation effects due to the heated substrate, whereas non-iridescence is theoutcome of short-range-ordered packing of nanoparticles by depletion attractionand friction effects produced by polymer brushes. We show that the colors ofthe final deposits from individual droplets remain unchanged while the viewingangle is varied under ambient light. We expect that the coating method iscompatible with ink-jet printing and the uniformly coated self-assemblednon-iridescent nanostructures have potential for color displays usingreflection mode and other optical devices.

Uniform coating of self-assembled non-iridescent colloidal nanostructures using Marangoni effects and polymers