Supraballs offer a new way to color materials

September 18, 2017 by Bob Yirka, Phys.org report
A photo of a rainbow-like flowers, painted with supraball inks made of five different sizes of core-shell synthetic melanin nanoparticles. Credit: Ming Xiao, University of Akron

An international team of researchers has created a new way to color manufactured materials. In their paper published in the journal Science Advances, the group describes how they created the new coloring technique and why they believe it provides benefits over conventional methods.

Prior research has shown that there are two basic ways to produce color in a material. One is to use materials that have molecules capable of absorbing light, the other is to use materials that cause light to scatter in desired ways using nanostructures. Material scientists have found that using structures to create color has many advantages over those that require absorption, but making them that way has proven to be challenging. In this new effort, the researchers report that they have developed a technique that overcomes those challenges, allowing for the production of colored materials in a way that is fast, simple and scalable.

The new technique was inspired by duck and turkey feathers. The team created tiny balls of melanin and then coated them with silica to create structures similar to those found in the . Prior research has shown that the spacing between balls of melanin produces different colors. The clear silica coating serves that purpose by forcing the balls farther apart or closer together. The distance is determined by the thickness of the coating—a thick one forces the balls farther apart, while the opposite brings them closer together. Interestingly, observed under a microscope, they are all black. It is only when they are seen from a normal distance that the color emerges. The team notes that changing the size of the balls has no impact on the color produced.

The team calls the result of their effort "supraballs." After creating them and seeing how they worked, they studied them further to understand what was happening. They found that the cores were highly refractive while the shells had a low refractive index, which served to increase reflectance, resulting in colors that were brighter. They note that supraballs could be added directly to paint or plastic base to create desired colors and suggest they might also be useful for inks and cosmetic products.

A video shows supraball painted flowers do not change color when the sample is rotated at different angles. Credit: Xiao et al., Sci. Adv. 2017;3: e1701151
Each column represents supraballs made of different sizes of core-shell synthetic melanin nanoparticles. (A) Scanning electron microscope (SEM) images of whole supraball morphologies. (B) High resolution SEM images of top surfaces of supraballs. (C) Cross-sectional transmission electron microscope images of the inner structure of supraballs. Scale bars, (A) 2 micrometers, (B) 500 nanometers and (C) 500 nanometers. Credit: Xiao et al., Sci. Adv. 2017;3: e1701151

Explore further: A way to laser print colors that will not fade using tiny columns

More information: Ming Xiao et al. Bioinspired bright noniridescent photonic melanin supraballs, Science Advances (2017). DOI: 10.1126/sciadv.1701151

Abstract
Structural colors enable the creation of a spectrum of nonfading colors without pigments, potentially replacing toxic metal oxides and conjugated organic pigments. However, significant challenges remain to achieve the contrast needed for a complete gamut of colors and a scalable process for industrial application. We demonstrate a feasible solution for producing structural colors inspired by bird feathers. We have designed core-shell nanoparticles using high–refractive index (RI) (~1.74) melanin cores and low-RI (~1.45) silica shells. The design of these nanoparticles was guided by finite-difference time-domain simulations. These nanoparticles were self-assembled using a one-pot reverse emulsion process, which resulted in bright and noniridescent supraballs. With the combination of only two ingredients, synthetic melanin and silica, we can generate a full spectrum of colors. These supraballs could be directly added to paints, plastics, and coatings and also used as ultraviolet-resistant inks or cosmetics.

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Jeffhans1
not rated yet Sep 18, 2017
I expect to see this spread to nearly every industry and the quicker the better.
thingumbobesquire
not rated yet Sep 19, 2017
Leonardo Da Vinci would be pleased with this.

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