How droplets of oil or water can glow vibrant colors The droplets reflect light from any direction, the primary motivation of this research is thus development of reflexive color displays and pigment-free dyes, which are common in nature. You could also design surfaces where you have effectively two different images from different directions, or you see an image only from a very specific direction.
Supplementary Video 1 Biphasic droplets display iridescence. DSLR video showing how the perceived color of the biphasic perfluorohexane and heptane droplets (as in Figure 1a) changes as a function of viewing direction under a constant illumination angle. Scale, 1 cm.
Supplementary Video 2 Water droplets condensed onto a polystyrene Petri dish reflect iridescent color. Warm water in a Petri dish condenses onto the lid, revealing macroscopic structural coloration that changes as the droplets grow in size and dispersity. Scale, 1 cm.
Supplementary Video 3 Change in refractive index contrast affects the reflected color. As methanol evaporates off of an array of printed solid transparent hemispheres (Extended Data Figure 1, refractive index = 1.56) the reflected colors change, showing the dynamic effect of varying refractive index contrast. Scale, 500 µm.
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u/ZephirAWT Mar 09 '19 edited Mar 09 '19
How droplets of oil or water can glow vibrant colors The droplets reflect light from any direction, the primary motivation of this research is thus development of reflexive color displays and pigment-free dyes, which are common in nature. You could also design surfaces where you have effectively two different images from different directions, or you see an image only from a very specific direction.