SUPRABALL FREE FULL

(C) The reflectance intensity ratio between core-shell and homogeneous structures changes as we vary the ratio of core radius to core-shell nanoparticle total radius.Ĭharacterization of supraballs. (B) Normal reflectance spectra from the (111) plane of FCC lattices made of core-shell nanoparticles and homogeneous nanoparticles with similar sizes and equivalent refractive indices: high-RI core/low-RI shell nanoparticles (core: RI, 1.74 diameter, 200 nm shell: RI, 1.45 thickness, 50 nm), equivalent homogeneous nanoparticles (RI, 1.54 diameter, 300 nm), and low-RI core/high-RI shell nanoparticles (core: RI, 1.45 diameter, 267 nm shell: RI, 1.74 thickness, 16.5 nm). Llovet) are from under license numbers CCBY-SA 2.0 ( by-sa/2.0/) and CCBY 2.0 (). gallopavo) wing feather and a cross-sectional TEM image of a single barbule (right). (A) Two biological examples to enhance color brightness: a green-winged teal (Anas crecca) wing feather and a cross-sectional transmission electron microscopy (TEM) image of a single barbule (left) and an iridescent wild turkey (M.

Natural inspirations and the optical model. These supraballs could be directly added to paints, plastics, and coatings and also used as ultraviolet-resistant inks or cosmetics.

SUPRABALL FREE FULL

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

Supraball free