Fabrication and Application of Structural Color Coatings

Shen, Zhen; Chen, Hao; Wu, Limin

doi:10.1002/9781118883051.ch9

Cited by 1 publication

(2 citation statements)

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“…PCs, with periodic dielectric nanostructure, are capable of affecting light propagation and creating forbidden gap (photonic stopband) in their photonic band structure. 50,51 In general, the wavelength of light diffracted from 3D colloidal PCs is determined by the Bragg law in eq 1: where n eff is the effective refractive index, which has a relationship with the filling volume ratio v i of different refractive indexes n i by n eff = (Σn i 2 v i ) 1/2 . Equation 1 changes as follows:…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…PCs, with periodic dielectric nanostructure, are capable of affecting light propagation and creating forbidden gap (photonic stopband) in their photonic band structure. , In general, the wavelength of light diffracted from 3D colloidal PCs is determined by the Bragg law in eq : λ = 2 n eff d ( 1 − sin 2 θ / n eff 2 ) 1 / 2 where n eff is the effective refractive index, which has a relationship with the filling volume ratio v i of different refractive indexes n i by n eff = (Σ n i 2 v i ) 1/2 . Equation changes as follows: λ = 2 d false( normalΣ n i 2 v i − normalsin 2 θ false) 1 / 2 Equation is also considered a detailed expression of the Bragg diffraction, where d is the distance between crystalline planes in the (111) direction and related to the bead diameter D by d = (2/3) 1/2 D ; and θ is the angle between the incident light and the normal to the ( hkl ) planes.…”

Section: Resultsmentioning

confidence: 99%

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Visual Gustation via Regulable Elastic Photonic Crystals

Xie,

Zheng,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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The unique structural sensitivity of photonic crystals (PCs) endows them with stretchable or elastic tunability for light propagation and spontaneous emission modulation. Hydrogel PCs have been demonstrated to have biocompatibility and flexibility for potential human health detection and environmental security monitoring. However, current elastic PCs still possess a fixed elastic modulus and uncontrollable structural colors based on a tunable elastic modulus, posing considerable challenges for in situ detection, particularly in wearable or portable sensing devices. In this work, we introduced a novel chemo-mechanical transduction mechanism embedded within a photonic crystal nanomatrix, leading to the creation of structural colors and giving rise to a visual gustation sensing experience. By utilizing the captivating structural colors generated by the hydrogel PC, we employ abundant optical information to identify various analytes. The finite element analysis proved the electric field distribution in the PC matrix during stretch operations. The elastic-optical behaviors with various chemical cosolvents, including cations, anions, saccharides, or organic acids, were investigated. The mechanism of the Hofmeister effect regulating the elasticity of hydrogels was demonstrated with the network nanostructure of the hydrogels. The hydrogel PC matrix demonstrates remarkable capability in efficiently distinguishing a wide range of cations, anions, saccharides, and organic acids across various concentrations, mixtures, and even real food samples, such as tastes and soups. Through comprehensive research, a precise relationship between the structural colors and the elastic modulus of hydrogel PCs has been established, contributing to the biomatching elastic-optics platform for wearable devices, a dynamic environment, and clinical or health monitoring auxiliary.

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Section: ■ Results and Discussionmentioning

confidence: 99%