Abstract In the modern era, structural color materials are regarded as safe and promising alternatives to colorants that contain harmful components. However, developing exhibit vivid colors with minimal angular dependence is crucial for their practical application. this study, spherical colloidal crystals (photonic balls) bright effectively suppressed developed using monodisperse high refractive index CeO₂ particles. To fabricate these photonic balls, CeO₂@PDA particles synthesized by...

A photonic ball is a spherical colloidal crystal. Because it can exhibit vivid structural colors, many attempts have been made to apply as structurally colored pigment. However, the optical properties of are complicated because different crystal planes be involved in coloration mechanism, depending on size constituent particles. In this paper, we report comparative study balls consisting silica particles with sizes ranging from 220 500 nm. We first analyze reflectance spectra acquired nearly...

Metal poly(heptazine imide) (MPHI) exhibits various optoelectronic functions by accommodating metal ions in its heptazine-based graphite-like two-dimensional layer. Although potassium PHI (KPHI) is the most well-studied MPHI series, there are unresolved issues regarding mechanism responsible for unique properties, particularly high photocatalytic activity. The mechanisms underlying other diverse such as photochromism and photoconduction, also remain unknown. Herein, we focused on elucidating...

Abstract The coloration mechanism of the photonic ball is investigated, which a spherical aggregation submicrometer‐sized colloidal particles. An interesting optical property reported for balls with particles larger than 400 nm: ring‐like iridescent reflection appears on peripheral part when observed under an microscope. Previous studies considered grating diffraction or Bragg separately to explain this iridescence. Here, it shown from detailed structural and investigations that both...

A material that can capture changes in environmental stimuli as a color change be used to develop sensors and displays. By producing an ordered structure polymer gel reflects particular wavelengths of light, we express the volume occurs based on environment wavelength reflected i.e., structural color. To date, many systems have been developed hue function temperature, pH, substance, applied force, so on. However, is expected from principle optical interference, usually shows red-shift with...

The structural colours of certain insects are produced by three-dimensional periodic cuticle networks. topology the network is known to be based on mathematically well-defined triply minimal surface. In this paper, we report discovery an I-WP minimal-surface-based photonic crystal scale a longhorn beetle. contrast gyroid or diamond surfaces, which found in butterfly and weevil scales, respectively, surface unbalanced surface, wherein two subspaces separated different terms shape volume...

Interest has been rising in investigating spherical colloidal clusters for their potential application to optical materials, such as pigments and sensors. It is also interesting that the have various types of particle arrangements, including onion-like, icosahedral, face-centered cubic (FCC) single crystal types. Generally, structural characterizations cluster surfaces are often performed by scanning electron microscopy. In this study, we investigate arrangements cross-sections through cuts...

Dark photocatalysis is the ability of a photocatalyst to accumulate photocarriers during light irradiation and consume them for redox reactions under dark conditions. This phenomenon photocatalysts storing known as charge accumulation. can mitigate fluctuations in photocatalytic reaction efficiency response fluctuating solar irradiation. Potassium poly(heptazine imide) (K-PHI) has attracted considerable attention due its high undergo photocatalysis. However, detailed mechanism accumulation...

The development of materials with circularly polarized luminescence (CPL) properties is a promising but challenging frontier in advanced science. Modulating the chiral polymers has also been focus research. Studies have conducted to control ground-state chirality by adjusting concentration dopant. However, inversion CPL fluorescent liquid crystal particles dopant not reported. Here, we report preparation cholesteric (FCLC) that display polarizable structural color and CPL, demonstrating how...

UV response switch of a wing color in Papilio polytes butterflies is important for dimorphic female-limited Batesian mimicry.

Spherical colloidal clusters have attracted considerable attention, owing to their potential as optical materials. Interestingly, they exhibit a rich variety of particle arrangements, such face-centered cubic (fcc) and icosahedral types, whose characteristics been hitherto unexplored. This study focuses on the evaluation spherical with decahedral structures. First, arrangement is evaluated using electron microscopy, quantitative structural model constructed based observed surface cross...

We prepared a colloidal amorphous array by applying uniaxial pressure to powder of monodispersed silica particles. Pellet-shaped samples were obtained that exhibit different structural colors depending on the diameter characterized optical properties arrays measuring angle-dependent scattering spectrum wherein several spectral peaks observed. The peak at longest wavelength was caused short-range order particle arrangement. Interestingly, this exhibited smaller shift in than observed similar...

Abstract Colloidal particles form a face‐centered‐cubic (FCC) lattice on crystallization; however, recent studies have indicated that the cluster with icosahedral symmetry can be formed under spherical confinement. The appears only when number of constituent is small because FCC favored thermodynamically for bulk colloidal crystal. This paper reports observation large comprising ≈4.9 × 10 5 particles, which considerably larger than previously reported number. clearly exhibits triangular...

Brilliantly colored butterflies and weevils are known to utilize photonic crystals for their coloration. Interestingly, the morphology of such made cuticle is based on triply periodic minimal surfaces as gyroid diamond surfaces. Recently, a different minimal-surface-based crystal, I-WP surface, was discovered inside scale longhorn beetle. The letter I derived from expressing body center symmetry WP wrapped package. It reported that brilliant green color produced by band gap existing along...

Colloidal crystals with spherical shapes are called photonic balls, and their optical properties have been extensively studied because they can be applied as structurally colored pigments or colorimetric sensors. When a colloidal crystal consists of small particles, e.g., 250 nm in diameter, the (111) planes face‐centered cubic lattice cause Bragg reflection, resulting brilliant structural color. However, that consist larger 400 different may involved coloration; (220) ring‐like iridescent...

Spherical colloidal clusters have various types of particle arrangements. Interestingly, one type has an icosahedron symmetry, characterized by the existence five-fold axes. When size is comparable to wavelength light, icosahedral exhibit a unique triangular reflection with specific wavelength, owing optical interference. In this paper, we report results detailed study on position-dependent peak within region. Based map and spectral shape, propose structural model cluster discuss its...

We report a simple method for growing single crystals of 6Cycloparaphenylene ([6]CPP), p-conjugated molecule with non-planar molecular structure. Using the vapor diffusion dimethyl sulfoxide (DMSO) as good solvent and water poor solvent, we obtained [6]CPP approximately 300 µm in size. Crystal structure analysis shows that crystal has herringbone contains DMSO water. The infrared properties are almost isotropic, reflecting their structure; however, there is slight anisotropy due to...

Poly(heptazine imide) (PHI), a carbon nitride polymer, is highly efficient visible-light-driven photocatalytic material. We aimed to improve its performance for CO2 conversion. prepared M-PHIs by encapsulating different metals (M = K, Li, Rb, and Na) H-PHIs, in which the metal of each M-PHI was ion-exchanged with proton. evaluated their activities conversion found that Na-PHI H-PHI, from (H-PHI(NaCl)), showed more than twice CO production efficiency melon other PHIs.The high H-PHI(NaCl)...

Potassium poly(heptazine imide) (K-PHI) is a two-dimensional carbon nitride polymer that has recently attracted attention as visible-light-driven photocatalyst. We developed solid material does not require liquid electrolyte composite of K-PHI with an ionic or insulating matrix. The obtained composites retained some the unique optoelectronic properties and were in semisolid state could be easily shaped warm state. Simple devices using these exhibited photoconductivity by conduction potassium...

In article number 2100257, Ohnuki and co-workers investigate the optical properties of massive spherical colloidal clusters with icosahedral structures. The structure were discovered several years ago show a unique triangular reflection pattern, which is expected to be applied new materials such as pigments/dyes colorimetric sensors.