Natural
amorphous photonic crystals benefit from reflectance at
selective wavelengths in some specific existing natural systems. Noniridescence
from natural organisms has also attracted great interest for various
examples in bionic colors, pigments, and paintings. Here, Air@C@TiO2 sphere was obtained by the first calcination of PS@TiO2 core–shell nanoparticles in nitrogen to ensure the
integrity of the shell structure followed by low-temperature calcination
to obtain the appropriate color saturation. We demonstrate that, compared
with the prepared colored PS@TiO2/carbon black (CB) pigments,
angle-independent hollow Air@C@TiO2 nanoparticles have
enhanced color stability under the action of in situ synthesized carbon
black (CB). Our results suggest that it is easy to change the color
of these Air@C@TiO2 spheres by adjusting the sphere structure
sizes, which have the potential to show visual signaling.
Based on the traditional Jun ware glaze, the imitated Jun ware glazes were prepared by adding iron oxide and introducing phase separation agent apatite through four-angle-method. The effect of iron oxide contents, phase separation and the firing temperature on the color of Jun ware glazes were investigated by a neutral atmosphere experiment, optical microscope and scanning electronic microscope. The results showed that the colorant, mainly Fe2O3, contributed to the Jun ware glaze blue and cyan colors of Jun ware glaze. The light scatter caused by the small droplets in phase separation structure only influenced the shade of the glaze color, intensify or weaken the color, and thus made the glaze perfect and elegant opal visual effects, but was not the origin of general blue or cyan colors of Jun ware glaze. In addition, the firing temperature and the basic glaze composition affected the glaze colors to some extent.
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