Amorphous photonic structure in a charged colloidal system showing angle-independent uniform color

Kanai, Toshimitsu; Nakagawa, Sato; Takeshima, Hikaru; Hirano, Yuna

doi:10.1016/j.jcis.2022.08.162

Cited by 5 publications

(4 citation statements)

References 28 publications

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“…The colors originate Figure 2c shows the transmission spectra of the colloidal amorphous suspension in the cell at a salt concentration of 120 µM before and after UV light irradiation. Before UV irradiation, the spectrum was characteristic of the amorphous structure, that is, the transmittance was low in the short-wavelength range and sharply increased at around the Bragg reflection wavelength of the charge-stabilized colloidal crystal with the same particle diameter and volume fraction [30]. A high transmittance of more than 70% was achieved in the longer wavelength range.…”

Section: Resultsmentioning

confidence: 99%

“…By contrast, we previously achieved the formation of a colloidal amorphous structure in a charged colloidal suspension, in which monodisperse submicrometer-size particles were separated from each other using a liquid medium (water) [ 30 ]. When the electrorepulsion between the charged particles was weakened, such as by the addition of salt, the crystalline structure transformed into an amorphous one with an angle-independent color.…”

Section: Introductionmentioning

confidence: 99%

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Angle-Independent Color Change in Thermoresponsive Gel-Immobilized Colloidal Amorphous Film Attached to PET Substrate

Nakagawa,

Hirano,

Tanaka

et al. 2023

Polymers

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Gel-immobilized colloidal amorphous structures comprise short-range-ordered monodisperse submicrometer particles embedded into a soft polymer gel. They exhibit an angle-independent structural color that is tunable in response to external stimuli via a volume change in the gel, which has significant potential for the development of sensors that respond to stimuli via angle-independent color changes. In this study, the amorphous structure of a charged colloidal suspension in water was immobilized in a thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) gel film and simultaneously attached to a polyethylene terephthalate (PET) substrate. The gel film exhibited a uniform angle-independent color that changed in response to changes in temperature (i.e., thermosensitivity). Attachment to the PET substrate suppressed changes in the gel film area and film distortion, despite significant volume changes in the gel. Consequently, the degree of thermosensitivity was enhanced. The PET-attached gel-immobilized colloidal amorphous film was easy to handle and had excellent flexibility, allowing it to wrap around the surfaces of curved objects. These features are advantageous for sensor applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Angle-Independent Color Change in Thermoresponsive Gel-Immobilized Colloidal Amorphous Film Attached to PET Substrate

Nakagawa,

Hirano,

Tanaka

et al. 2023

Polymers

Self Cite

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“…The structural color [3,4] due to the alternating layered structure of chitin and calcium carbonate, [5] which are biopolymers, is said to achieve a luster. The structural color is a non‐fading coloration technology that does not use dyes [6] and is used for morpho butterfly wings, stained glass, and pigments in cosmetics [7–9] …”

Section: Introductionmentioning

confidence: 99%

“…[2] The structural color [3,4] due to the alternating layered structure of chitin and calcium carbonate, [5] which are biopolymers, is said to achieve a luster. The structural color is a non-fading coloration technology that does not use dyes [6] and is used for morpho butterfly wings, stained glass, and pigments in cosmetics. [7][8][9] Thin-film interference occurs when light waves reflected at the upper and lower boundaries of a film interfere with each other, enhancing or reducing the reflected light of a specific wavelength, and is often observed in nature.…”

Section: Introductionmentioning

confidence: 99%

Appearance of Structural Color by Constructing Highly Regular Single‐Particle Layers on a Water Surface of Organo‐Modified Magnetite with Different Particle Diameter

Kikuchi,

Yamagishi,

Fujimori

2023

ChemistrySelect

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Using triiron tetroxide/magnetite particles with particle diameters of 5 nm and 30 nm, the structural color occurrence behavior due to multi‐particle layer formation was compared. The −OH‐terminated groups on the surface of the outermost layer of magnetite were bound with long‐chain fatty acids to obtain amphiphilic organo‐modified magnetite. Organo‐modified magnetite was spread as a single‐particle layer on the water surface and layered in multiple layers on a solid substrate. Organo‐modified magnetite multilayers layered to a thickness close to the wavelength of visible light exhibited a clear structural color, regardless of the particle size. However, in the case of fine particles with a diameter of 5 nm, the structural color did not appear when the in‐plane packing density was low, and the density of the two‐dimensional plane played an important role. In comparison, in the same production process and particle type, a clearer structural color was expressed with a diameter of 30 nm, and individual differences in physical properties were also confirmed when other nanoparticle types were used.

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Advances in Photonic Crystal Research for Structural Color

Chen,

Wei,

Pan

et al. 2024

Adv Materials Technologies

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Structural color is a remarkable physical phenomenon that exists widely in nature. Unlike traditional color rendering methods, they are realized mainly through micro/nanostructures that interfere, diffract, scatter light, and exhibit long‐life and environmental‐friendly color effects. In nature, a few organisms use their color‐changing system to transmit information, such as courtship, warning, or disguise. Meanwhile, some natural inorganic minerals can also exhibit structural colors. Learning from nature, scientists have achieved large‐scale structural color design and manufacturing technology for artificial photonic crystals. Photonic crystals have a unique microstructure that forms a band gap under the action of the periodic potential field, consequently causing Bragg scattering due to the periodic arrangement of different refractive index media within them. Because of the apparent photonic band gap and the ability to form local photons at crystal defects, photonic crystals have been extensively studied in recent years and have broad application prospects in photonic fibers, optical computers, chips, and other fields. In this review, the research, properties, and applications of photonic crystals in recent years are presented, as well as insight into the future developments of photonic crystals.

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Amorphous photonic structure in a charged colloidal system showing angle-independent uniform color

Cited by 5 publications

References 28 publications

Angle-Independent Color Change in Thermoresponsive Gel-Immobilized Colloidal Amorphous Film Attached to PET Substrate

Angle-Independent Color Change in Thermoresponsive Gel-Immobilized Colloidal Amorphous Film Attached to PET Substrate

Appearance of Structural Color by Constructing Highly Regular Single‐Particle Layers on a Water Surface of Organo‐Modified Magnetite with Different Particle Diameter

Advances in Photonic Crystal Research for Structural Color

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