Humidity-dependent colour change in the green forester moth,<i>Adscita statices</i>

Wilts, Bodo D.; Mothander, Karolina; Kelber, Almut

doi:10.1098/rsbl.2019.0516

Cited by 11 publications

(11 citation statements)

References 37 publications

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“…The formation of a water film is loosely comparable to the already known mechanism of colour change in porous, multilayered scales [14][15][16][17], as the replacement of air by water might also induce the formation of a water thin film. Its speed, however, is fundamentally different, taking only seconds to complete whereas the process in multi-layer scales generally takes minutes.…”

Section: Discussionmentioning

confidence: 59%

“…A change in refractive index contrast between the interfaces in a multi-layer in the cuticle causing a colour change can also be found in the seaweed Chondrus crispus under wet and dry conditions [13]. A similar mechanism, where the replacement of air by water causes changes in the refractive index, is found in the multi-layer scales on the wings of Morpho butterflies [14] and green forester moths ( Adscita statices ) [15] and in the scales of the beetle Hoplia coerulea [16]. In the longhorn beetle, Tmesisternus isabellae both swelling of the multi-layer period in the scale and refractive index contrast reduction due to water infiltration leads to a marked colour change [17].…”

Section: Introductionmentioning

confidence: 99%

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Rapid and reversible humidity-dependent colour change by water film formation in a scaled springtail

Vanthournout,

Janssens,

Debruyn

et al. 2023

J. R. Soc. Interface.

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Colour is often not a static trait but can change over time either through biotic or abiotic factors. Humidity-dependent colour change can occur through either morphological change (e.g. to feather barbules in birds) or by the replacement of air by water causing a shift in refractive index, as seen in arthropod multi-layer cuticles or scales. The scaled springtail Lepidocyrtus cyaneus has scales that produce colour largely via thin film interference from their lamina. We observed a marked colour change from golden to violet/purple coloration in humid conditions. Light microscopy, micro-spectrophotometry, contact angle goniometry and optical modelling indicate that the formation of a thin film of water on top of the hydrophilic scales increases their laminar thin film thickness, causing a shift towards violet/purple colour. Evaporation of the water film causes the metallic golden colour to return. This constitutes a remarkably rapid colour change (in the order of seconds), only limited by the speed of water film condensation and evaporation, that may serve as inspiration for new dynamically coloured materials and sensors.

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Section: Discussionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Rapid and reversible humidity-dependent colour change by water film formation in a scaled springtail

Vanthournout,

Janssens,

Debruyn

et al. 2023

J. R. Soc. Interface.

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“…This insect changes its color from green on a dry day to rusty red on a humid day, which is realized by water humidity-induced variation of the thin-film interference derived from the extremely hydrophilic melanized-chitin multilayers in the wing scales. 70 In previous studies, CNC-based UV-shielding materials were mainly prepared using chemically modified CNC with UVabsorbing molecules or through incorporating organic UV blockers, lignin, and UV-absorbing inorganic particles into CNC films. 71−73 Humidity-responsive CNC films with dynamic color changes were also realized with composite films consisting of neat CNC and other hygroscopic materials such as glucose, hydrophilic polymers, etc.…”

Section: Resultsmentioning

confidence: 99%

“…200 nm is distinguished from many CNC-based humidity-sensing materials. ,,, The brilliant and bright color of the CNC@PDA films could facilitate direct perception of the color change compared to the low color visibility of neat CNC-based films. ,, The fast and reversible dynamic color from blue to rusty red as driven by water vapor is highly similar to the green forester moth, Adscita statices. This insect changes its color from green on a dry day to rusty red on a humid day, which is realized by water humidity-induced variation of the thin-film interference derived from the extremely hydrophilic melanized-chitin multilayers in the wing scales …”

Section: Resultsmentioning

confidence: 99%

Biomimetic Chiral Photonic Materials with Tunable Metallic Colorations Prepared from Chiral Melanin-like Nanorods for UV Shielding, Humidity Sensing, and Cosmetics

et al. 2022

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Many biological species combine the helical organization of cellulose or chitin microfibrils with broadband light absorption of black melanin to produce brilliant structural colors with metallic and glossy effects and other diverse functions. In this work, based on core−shell CNC@PDA chiral nanorods consisting of cellulose nanocrystals (CNCs) as the core and melanin-like polydopamine (PDA) as the shell that can form welldefined chiral liquid crystal phases, we report chiral photonic materials that closely mimic the unique coloration mechanisms and functionalities mastered by several biological species. The photonic films formed by such single CNC@PDA nanorods have brilliant iridescent structural colors originating from selective reflection of circularly polarized lights by the helical organization of CNC@PDAs across the films. Furthermore, the colors of such films have background-independent brightness, high visibility, and metallic effects that arise from the light absorption of the PDA component. Especially, the color ranges and metallic effects of the films can be conveniently tuned by varying the thickness of the PDA shell. In addition, the UV absorption and hygroscopic properties of PDA endow these CNC@PDA films with efficient broadband UV shielding and sensitive humidity-induced dynamic color changes. Due to the mussel-like superior adhesion of PDA, CNC@PDAbased photonic coatings can be formed conformably onto diverse kinds of substrates. A shiny eye shadow with viewing angledependent colorful patterns was used to demonstrate the potential applications. With combinations of multiple unique properties in one photonic material fabricated from a single building block, these CNC@PDA-based films are expected to have potential applications in cosmetics, UV protection, anticounterfeiting, chiral reflectors, etc.

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“…As a result, the structural color’s superiority in practical applications cannot be highlighted enough due to ease of processing and evidence of its widespread adoption. Color changes in these structure are also tunable, and according to principles, structural color materials change color in response to humidity, 21 temperature, 22 pH, 23 dielectric property of solvent, 24 presence of dopants, 25 electrical and magnetic signals, 26 enzymes, 27 alcohol, 28 urea, and heavy metals. 29 Structural color material can be used to color encrypt 30 a structure in a wide range of optical fields, not just responsive optical devices.…”

Section: Introductionmentioning

confidence: 99%

Chiral Liquid Crystalline Properties of Cellulose Nanocrystals: Fundamentals and Applications

Moud

2022

ACS Omega

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By using an independent self-assembly process that is occasionally controlled by evaporation, cellulose nanocrystals (CNCs) may create films (pure or in conjunction with other materials) that have iridescent structural colors. The self-forming chiral nematic structures and environmental safety of a new class of photonic liquid crystals (LCs), referred to as CNCs and CNC-embedded materials, make them simple to make and treat. The structure of the matrix interacts with light to give structural coloring, as opposed to other dye pigments, which interact with light by adsorption and reflection. Understanding how CNC self-assembly constructs structures is vital in several fields, including physics, science, and engineering. To constructure this review, the colloidal characteristics of CNC particles and their behavior during the formation of liquid crystals and gelling were studied. Then, some of the recognized applications for these naturally occurring nanoparticles were summarized. Different factors were considered, including the CNC aspect ratio, surface chemistry, concentration, the amount of time needed to produce an anisotropic phase, and the addition of additional substances to the suspension medium. The effects of alignment and the drying process conditions on structural changes are also covered. The focus of this study however is on the optical properties of the films as well as the impact of the aforementioned factors on the final transparency, iridescent colors, and versus the overall response of these bioinspired photonic materials. Control of the examined factors was found to be necessary to produce reliable materials for optoelectronics, intelligent inks and papers, transparent flexible support for electronics, and decorative coatings and films.

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Humidity-dependent colour change in the green forester moth,Adscita statices

Cited by 11 publications

References 37 publications

Rapid and reversible humidity-dependent colour change by water film formation in a scaled springtail

Rapid and reversible humidity-dependent colour change by water film formation in a scaled springtail

Biomimetic Chiral Photonic Materials with Tunable Metallic Colorations Prepared from Chiral Melanin-like Nanorods for UV Shielding, Humidity Sensing, and Cosmetics

Chiral Liquid Crystalline Properties of Cellulose Nanocrystals: Fundamentals and Applications

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