Chameleon-like elastomers with molecularly encoded strain-adaptive stiffening and coloration

Science, Journal Year: 2018, Volume and Issue: 359(6383), P. 1509 - 1513

Published: March 29, 2018

Active camouflage is widely recognized as a soft-tissue feature, and yet the ability to integrate adaptive coloration tissuelike mechanical properties into synthetic materials remains elusive. We provide solution this problem by uniting these functions in moldable elastomers through self-assembly of linear-bottlebrush-linear triblock copolymers. Microphase separation architecturally distinct blocks results physically cross-linked networks that display vibrant color, extreme softness, intense strain stiffening on par with skin tissue. Each functional regulated structure one macromolecule, without need for chemical cross-linking or additives. These remain stable under conditions characteristic internal bodily environments ambient conditions, neither swelling fluids nor drying when exposed air.

Language: Английский

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Ozone depletion, ultraviolet radiation, climate change and prospects for a sustainable future

Nature Sustainability, Journal Year: 2019, Volume and Issue: 2(7), P. 569 - 579

Published: June 24, 2019

Language: Английский

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Bio-inspired intelligent structural color materials

Materials Horizons, Journal Year: 2019, Volume and Issue: 6(5), P. 945 - 958

Published: Jan. 1, 2019

Structural color materials with bioinspired functions are being introduced into real-life applications.

Language: Английский

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Metallosupramolecular Photonic Elastomers with Self‐Healing Capability and Angle‐Independent Color

Advanced Materials, Journal Year: 2018, Volume and Issue: 31(6)

Published: Dec. 13, 2018

Abstract Photonic elastomers that can change colors like a chameleon have shown great promise in various applications. However, it still remains challenge to produce artificial photonic with desired optical and mechanical properties. Here, the generation of metallosupramolecular polymer‐based tunable strength, angle‐independent structural color, self‐healing capability is reported. The are prepared by incorporating isotropically arranged monodispersed SiO 2 nanoparticles within supramolecular elastomeric matrix based on metal coordination interaction between amino‐terminated poly(dimethylsiloxane) cerium trichloride. exhibit colors, while Young's modulus elongation at break as‐formed reach 0.24 MPa 150%, respectively. superior elasticity enables their chameleon‐skin‐like mechanochromic capability. Moreover, capable healing scratches or cuts ensure sustainable properties, which crucial applications wearable devices, coating, visualized force sensing.

Language: Английский

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Regulatory changes in pterin and carotenoid genes underlie balanced color polymorphisms in the wall lizard

Proceedings of the National Academy of Sciences, Journal Year: 2019, Volume and Issue: 116(12), P. 5633 - 5642

Published: Feb. 28, 2019

Reptiles use pterin and carotenoid pigments to produce yellow, orange, red colors. These conspicuous colors serve a diversity of signaling functions, but their molecular basis remains unresolved. Here, we show that the genomes sympatric color morphs European common wall lizard ( Podarcis muralis ), which differ in orange yellow pigmentation ecology behavior, are virtually undifferentiated. Genetic differences restricted two small regulatory regions near genes associated with [ sepiapterin reductase SPR )] beta-carotene oxygenase 2 BCO2 metabolism, demonstrating core gene housekeeping pathway biosynthesis has been coopted for bright coloration reptiles indicating these loci exert pleiotropic effects on other aspects physiology. Pigmentation explained by extremely divergent alleles, haplotype analysis revealed abundant transspecific allele sharing lacertids exhibiting polymorphisms. The evolution ornaments is result ancient genetic variation cross-species hybridization.

Language: Английский

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Chemical syntheses of bioinspired and biomimetic polymers toward biobased materials

Nature Reviews Chemistry, Journal Year: 2021, Volume and Issue: 5(11), P. 753 - 772

Published: Oct. 5, 2021

Language: Английский

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Linkages between stratospheric ozone, UV radiation and climate change and their implications for terrestrial ecosystems

Photochemical & Photobiological Sciences, Journal Year: 2019, Volume and Issue: 18(3), P. 681 - 716

Published: Feb. 27, 2019

Language: Английский

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Color Perception: Objects, Constancy, and Categories

Annual Review of Vision Science, Journal Year: 2018, Volume and Issue: 4(1), P. 475 - 499

Published: July 13, 2018

Color has been scientifically investigated by linking color appearance to colorimetric measurements of the light that enters eye. However, main purpose perception is not determine properties incident light, but aid visual objects and materials in our environment. We review state art on object colors, constancy, categories gain insight into functional aspects perception. The common ground between these areas research tightly linked identification communication across observers. In conclusion, we argue should focus how processing adapted surface natural environment order bridge gap known early stages subjective color.

Language: Английский

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Quantitative Colour Pattern Analysis (QCPA): A comprehensive framework for the analysis of colour patterns in nature

Methods in Ecology and Evolution, Journal Year: 2019, Volume and Issue: 11(2), P. 316 - 332

Published: Dec. 2, 2019

Abstract To understand the function of colour signals in nature, we require robust quantitative analytical frameworks to enable us estimate how animal and plant patterns appear against their natural background as viewed by ecologically relevant species. Due limitations existing methods, pattern are rarely analysed conjunction with one another, despite a large body literature decades research on importance spatio‐chromatic analyses. Furthermore, key physiological visual systems such spatial acuity, spectral sensitivities, photoreceptor abundances receptor noise levels considered together Here, present novel framework, called Quantitative Colour Pattern Analysis (QCPA). We have overcome many qualitative analyses combining calibrated digital photography modelling. integrated updated analyses, including adjacency, contrast boundary strength analysis, be implemented using through Multispectral Image Calibration (MICA) Toolbox. This combination is enabled inclusion psychophysical luminance discrimination thresholds for image segmentation, which call ‘Receptor Noise Limited Clustering’, used here first time. QCPA provides psycho‐physiological approach modelling acuity convolution or frequency domains, followed Ranked Filtering’ eliminate intermediate edge artefacts recover sharp boundaries following smoothing. also new type ‘local intensity analysis’ well range approaches visualization data. combines analysis into what hope unified, free open source toolbox introduces data‐visualization approaches. These tools been seamlessly MICA providing dynamic user‐friendly workflow.

Language: Английский

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Artificial Chameleon Skin with Super-Sensitive Thermal and Mechanochromic Response

ACS Nano, Journal Year: 2021, Volume and Issue: 15(10), P. 15720 - 15729

Published: Sept. 14, 2021

Both the nonclose-packed structure and large refractive index contrast of guanine nanocrystals cytosols in iridophores play a vital role dynamic camouflage chameleons, including bright skin color tuning sensitivity to external stimulus. Here, photonic crystals consisting ZnS nanospheres polymers, which have similar indices with cytosols, respectively, are constructed by two-step filling strategy. ZnS@SiO2 self-assembled build intermediate close-packed followed polymers their interstices. The crystal is successfully achieved when silica portion etched HF solution refilled polymers. Excitingly, stimulus response designed as sensitive chameleons due structure. reflection peak can blue-shift more than 200 nm temperature increases from 30 55 °C or under 20% compressional strain. This work not only builds introducing strategy but also proves that high an effective achieve ultrasensitivity, highly desirable for various applications.

Language: Английский

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