Abstract
In this study, structural colors were fabricated by producing an amorphous array with atypical silica particles. The colors were controlled by an array of silica particles with different sizes. In previous research, the process required inducement of the amorphous array, which was complex. Meanwhile, in this paper, we proposed a simple one-step process. First, spherical silica nanoparticles were synthesized using the sol-gel process of the Stöber method. Atypical silica particles that induced an amorphous array were produced by adding a small amount of phenol-formaldehyde resin. Subsequently, the colloidal silica was converted to a powder using a convection oven. The characteristics of the synthesized silica particles were confirmed using a scanning electron microscope (SEM). All the synthesized silica powders obtained structural colors. Finally, the silica powders were dispersed in deionized (DI) water and coated on a glass slide. We confirmed that the silica particles showed different structural colors depending on the size of the particles. We also found that the color was highly independent of the viewing angle.
Highlights
The color of a substance is determined by its dyestuff and pigment
Photonic glass was obtained by evaporating the silica solution redispersed in DI water on a glass slide. Both spherical silica nanoparticles and atypical silica particles inducing an amorphous arrangement were fabricated through the one-step synthesis process
X-ray diffraction (XRD) patterns for the products synthesized by the sol-gel process
Summary
The color of a substance is determined by its dyestuff and pigment. the colors of these chemicals can degrade after prolonged exposure to ultraviolet radiation, which can lead to environmental pollution and product cost issues. Structural color with a regular array of particles changes color depending on the viewing angle This material is called a photonic crystal. The structural color associated with an irregular array of particles is less dependent on the viewing angle This substance is called a photonic glass [11,12,13]. The authors induced an amorphous array by mixing silica particles and carbon black This mixture resulted in the fabrication of structural color without angle dependency, with different colors arising depending on the size of the silica particles. Photonic glass was obtained by evaporating the silica solution redispersed in DI water on a glass slide Both spherical silica nanoparticles and atypical silica particles inducing an amorphous arrangement were fabricated through the one-step synthesis process. Structural color arising solely from silica particles has different colors depending on the sizes of the silica particles, and it is highly independent of viewing angle change
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