Abstract
It is desirable to fabricate colorful coatings that have nonfading properties and are environmentally friendly. In this study, a novel approach for creating structural color coatings from monodisperse silica particles is presented. The structural color coating films, formed from an array of silica particles with a small amount of black additive, are easily prepared by a simple electrophoretic deposition (EPD) technique. The arrangement of the particle array is controlled by varying the applied voltage and deposition time. The iridescence, that is, the angular dependence, of the structural color dramatically changes with the arrangement of the particle array. A variety of colored coatings can be produced by changing the size of the particles. Structural color coatings on materials with curved surfaces and complicated shapes are also achieved by the EPD method.
Highlights
Paints, that is, dyes or pigments, are often used in various industries to make colored products
If the diffuse electrical double layer on each particle is thick, the repulsion force between the particles increases. Such SiO2 particle dispersion is favored to the formation of a close-packed arrangement of spherical particles with long-range order, that is, colloidal crystals, by a simple evaporation-driven self-assembly process
The preparation of a roughly packed arrangement of SiO2 particles, that is, a colloidal amorphous array, from a SiO2 particle dispersion is difficult by such a simple process because of the strong tendency to crystallize.[21,40]
Summary
That is, dyes or pigments, are often used in various industries to make colored products. The structural color coating films, formed from an array of silica particles with a small amount of black additive, are prepared by a simple electrophoretic deposition (EPD) technique.
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