The Height of Chitinous Ridges Alone Produces the Entire Structural Color Palette

Raut, Hemant Kumar; Ruan, Qifeng; Finet, Cédric; Saranathan, Vinodkumar; Yang, Joel K. W.; Fernandez, Javier G.

doi:10.1002/admi.202201419

Cited by 8 publications

(9 citation statements)

References 25 publications

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“…But they are basically the results of interactions between microstructures and light. Although the height of chitinous ridges in some butterflies may be responsible for color generation, [ 47 ] the colors observed in butterflies are due to photonic bandgap, which can be confirmed by the SEM image of the butterfly wing (Figure 1b,c and Figures S1 and S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 74%

Eco‐Friendly Color Printing Using Transparent Wood Paper

Chen

Huang

et al. 2023

Advanced Optical Materials

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periodic structures, leading to specific light behaviors of grating diffraction or Bragg reflection or photonic band gap reflection. [14][15][16][17][18][19] This indicates that the structural color is mainly related to the refractive index contrast between materials and their arrangement in space. Compared with traditional dyes and pigments, structural color doesn't require toxic metal ions or organic component and will never fade, unless the micro/nano structures are destroyed. The structural color opens up a new way to produce a permanent, bright, and environmentally friendly color. Many efforts have been made in material and structural designs to improve the color vibrancy and the resolution of color prints. [20,21] High-saturated, long-lasting structural colors have been produced through various materials, and multiple applications have been developed, [6,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] such as dynamic color display and optical anticounterfeiting. Polymers are commonly used in structural color prints and corresponding substrate materials because of their convenient and mature processing technologies by heat, light, solvent, etc. [23,35] However, most polymers come from the petrochemical industry and cause environmental pollution due to difficulties in degrading in nature. [36,37] Cellulose is an ideal substrate for structural color because it is the most abundant, renewable, and biodegradable natural polymer on Earth. [38] To date, structural colors on cellulose materials only succeed in cellulose nanocrystals by assembling them in a way like liquid crystals. [31,[39][40][41][42] But they suffer from the expensive production process of nanocrystals and the difficulties in microstructure tuning required for multicolor Structural colors are recognized as environmentally friendly colors compared with traditional pigments and dyes. However, their structural substrates are usually made of polymers or solid materials that are difficult to decompose naturally. Finding high-performance bio-degradable substrates is essential to protect the environment. Transparent wood paper is a competitive candidate because of its excellent biodegradability, high transparency, and strength. Here, it is firstly demonstrated that structural color prints can be fabricated monolithically on transparent wood paper. By mimicking the color generation structures in nature, nanostructures are imprinted on the surface of delignified wood and exhibit diverse structural colors. Three basic colors of red, green, and blue are demonstrated, and the colors can be continuously tuned by the periodicity and observation angle. Vivid color prints can be realized on the transparent wood paper by structural design. The structural colored transparent wood paper is flexible and bendable, and colors will not fade after 12-month exposure to natural sunshine. Furthermore, the structural color prints on transparent wood paper are biodegradable and can be discarded directly after use. Both the structural colored relief and the trans...

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Section: Resultsmentioning

confidence: 74%

Eco‐Friendly Color Printing Using Transparent Wood Paper

Chen

Huang

et al. 2023

Advanced Optical Materials

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“…This represents a qualitative step forward in the artificial production of structural color with chitinous polymers. [6] More importantly, previous attempts to produce sustainable color using a biodegradable material have focused on modifying naturally occurring molecules (e.g., cellulose) to achieve a material that is manufacturable using conventional tools. [37,38] However, due to the stability of structural biomolecules, such modifications require highly bioactive chemicals (e.g., propylene oxide to form hydroxypropyl cellulose or chloroacetic acid to form nanocellulose), with health and environmental impacts that greatly exceed the benefits of using a biodegradable component.…”

Section: Large-scale Production Of Chitinous Colormentioning

confidence: 99%

“…The latter translates into accurate models that can be used to reverse engineer the chitinous structures of organisms by reproducing each of their features in isolation, allowing their multiple roles to be disentangled and providing new information to improve our use of chitin in product manufacturing. [4,6] While chitinous polymers are mainly used in biomimetic manufacturing for their mechanical characteristics, they often have other roles in natural systems, and the production of structural color in arthropods-specifically on the elytra of beetles (Coleoptera)-is one such an exceptionally eye-catching illustration of this. [7][8][9] In contrast to mere pigmentation, structural color -in addition to being highly saturated and fade proof-offers DOI: 10.1002/adem.202301713…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale Artificial Production of Coleoptera Cuticle Iridescence and Its Use in Conformal Biodegradable Coatings

Kompa,

Finet,

Saranathan

et al. 2024

Adv Eng Mater

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In this study, bioinspired chitinous manufacturing is leveraged to artificially reproduce iridescent gratings found in the cuticles of beetles living in concealed environments. Combining this with a melanin‐like background achieves a vibrant iridescence, similar to that produced by the multilayer reflectors in leaf beetles. In this process, the controlled production of optical structures is allowed using chitinous polymers, the same components that produce color in arthropod cuticles. This not only aids in understanding the functionality and evolutionary advantages of these structures without being limited to the existing solutions in animals—which entangle the solutions for several problems with the rubble of past functionalities—but also enables the creation of color with the second most abundant organic material on Earth, only surpassed in its ubiquity by cellulose. However, unlike cellulose‐based materials, the chitinous optical structures are produced by avoiding the use of strong organic solvents, representing a simplified approach to producing vibrant, iridescent, fully biodegradable, and ecologically integrated colors. Herein, the production of hundreds of square centimeters of iridescent chitinous surfaces, a scale suitable for imparting biodegradable color to large 3D objects, is demonstrated.

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“…[12][13] Some insects (e.g., butter ies) produce corresponding color changes using the scales on the surface of their body. [14][15][16] The diverse optical structures found in nature provide insight into how functional optical materials can be designed and exploited.…”

Section: Introductionmentioning

confidence: 99%

A synergistic biomimetic optical structure for household health monitoring

Zhang

Ding

et al. 2023

Preprint

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A breakthrough in the performance of bionic optical structures will only be achieved if we can obtain an in-depth understanding of the synergy mechanisms operating in natural optical structures and find ways to imitate them. In this work, inspired by feline eyes, an optical structure that takes advantage of a synergistic effect that occurs between resonant and reflective structures was designed. The reflective structure consists of anodic aluminum oxide with an aluminized inner layer (Al-AAO), and the resonant structure consists of three-dimensional (3D) graphene inside, and on the surface of the Al-AAO. The synergistic effect between the reflective and resonant components leads to a Raman enhancement factor (EF) of 1.16 × 107 which is much greater than that achieved using the reflective/resonant cavities on their own. A 2-3 order of magnitude increase in sensitivity could thus be achieved when used to detect model compounds. More importantly, the optical device was further used to develop a highly-sensitive household health monitoring system. The system uses simple apparatus (homemade centrifugal device and hand-held Raman spectrometer) and rapidly produces results (detection time＜3 min). It can thus be used to give early warning of acute diseases with high risk (e.g., acute myocardial infarction). The 3D-graphene/Al-AAO substrates were also found to have good reusability and storability (9% and 7% reduction in EF after washing 30 times and 8 weeks of storage, respectively). They thus reduce detection costs (to ~$1), making them much cheaper to use than the current gold-standard methods (e.g., ~$16 for gout detection).

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The Height of Chitinous Ridges Alone Produces the Entire Structural Color Palette

Cited by 8 publications

References 25 publications

Eco‐Friendly Color Printing Using Transparent Wood Paper

Eco‐Friendly Color Printing Using Transparent Wood Paper

Large‐Scale Artificial Production of Coleoptera Cuticle Iridescence and Its Use in Conformal Biodegradable Coatings

A synergistic biomimetic optical structure for household health monitoring

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