High transparency in the structural color resin films through quasi-amorphous arrays of colloidal silica nanospheres

Abstract

Novel quasi-amorphous structural color resin films are highly transparent, and have a uniform shining reflection color and physical rigidity, and so have enormous potential.

UV and blue-light anti-reflective structurally colored contact lenses based on a copolymer hydrogel with amorphous array nanostructures

“…This phenomenon is similar to the previously reported AA resin lms. 13,14 In general, the transmittance decreased as the f silica of AAs increased, and this phenomenon was owing to the strong reection of AAs. We also performed a transmittance stability test aer all samples were stored in DI water for 155 days (Fig.…”

“…22 In this case, n eff ¼ 1.427 for sample C (f silica ¼ 30%). Then, the reection peak wavelength l R of the vertical incident was determined according to the Bragg-Snell law [eqn (2)] as follows: 13,14 l R ¼ 2d int n eff (2) Accordingly, the 425 nm and 463 nm reection peak wavelengths (sample C) before and aer hydration and n eff can be calculated using eqn (2) to obtain d int_1 ¼ 148.9 nm (before hydration) and d int_2 ¼ 162.2 nm (aer hydration). The d int_1 value was very consistent with the D mean (approximately 151 nm) of the results from the LPSA (Fig.…”

“…The structural color of photonic structures is generally divided into periodic structures consisting of long-range ordered structures with iridescence (angle-dependent) 9,10 and short-range ordered amorphous (or quasi-amorphous) structures with non-iridescence (angle-independent). [11][12][13] Structural color is color generated by scattering, refraction, interference, or diffraction of visible light by microstructures or nanostructures. The mechanism of generating structural color differs from those of chemical dyes and pigments.…”

“…14 Generation of a colloidal nanosphere suspension is a facile approach to prepare structurally colored materials with periodic or AA nanostructures. [9][10][11][12][13] Structural color can be used as an optimal method for fabricating colored contact lenses compared with commercial colored contact lenses because of the bright color and absence of chemical dye in the former. Gu et al reported two approaches for fabricating structurally colored contact lenses using periodic crystal nanostructures.…”

Facile fabrication of micro-grooves based photonic crystals towards anisotropic angle-independent structural colors and polarized multiple reflections

“…Generally, there are two strategies in accomplishing this task: reducing the degree of order of the photonic structures or changing the local geometry [18]. In the first approach, amorphous photonic structures with short-range order can reduce the angle dependency of the structurally colored materials, which have been widely fabricated by spray-coating [19], gel or ionic liquid suspending [20], adding additives [21], spin coating and drop-casting [22]. For the later, colloid particles are assembled into spherical or hemispherical aggregates, such as micro-cylinders, micro-beads, fibers and superparticles [23,24].…”