Photonic paper: Multiscale assembly of reflective cellulose sheets in
            <i>Lunaria annua</i>

Guidetti, Giulia; Sun, Hui; Marelli, Benedetto; Omenetto, Fiorenzo G.

doi:10.1126/sciadv.aba8966

Cited by 13 publications

(5 citation statements)

References 43 publications

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“…As shown, the freely standing CAM films show vivid structural colors arising from the chiral nematic organization of rigid cellulose nanocrystals with pitch lengths controlled by local twisted stacking. [ 2,40–42 ] This helical organization in random tactoids can be observed as periodic fingerprints, a signature of chiral nematic phase (Figure S7, Supporting Information). [ 43 ] However, the CAM films show pitch expansion in comparison with traditional CNC materials caused by intercalation of the glucose‐PAM phase into the helicoidal organization ( Figure and Figure S7, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Switchable Photonic Bio‐Adhesive Materials

et al. 2021

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A soft photonic bio‐adhesive material is designed with real‐time colorimetrical monitoring of switchable adhesion by integrating a responsive bio‐photonic matrix with mobile hydrogen‐binding networking. Synergetic materials sequencing creates a unique iridescent appearance directly coupled with both adhesive ability and shearing strength, in a highly reversible manner. The responsive photonic materials, having a physically hydrogen‐bonded chiral nematic organization, vary their adhesion strength due to a transition in cohesive and interfacial failure mechanism in humid surroundings. The bright color appearance shifts from blue to red to transparent and back due to a change in pitch length of the chiral helicoidal organization that also triggers coupled changes in both mechanical strength and interfacial adhesion. Such reversible strength‐adhesion‐iridescence triple‐coupling phenomenon is further explored for design of super‐strong switchable bio‐adhesives for synthetic/biological surfaces with quick remotely triggered sticky‐to‐nonsticky transitions, removable conformal soft stickers, and wound dressings with visual monitoring of the healing process, to colorimetric stickers for contaminated respiratory masks.

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Section: Resultsmentioning

confidence: 99%

Switchable Photonic Bio‐Adhesive Materials

et al. 2021

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“…While nature shows an array of materials with striking optical properties, the biomimicry of such diverse structures is not usually achieved by chitin as a building block and the chitin photonics field has not been much developed. We find it presents an interesting contrast to cellulose photonics as only a few cellulosic species such as Pollia condensata [ 112 ], Margaritaria nobilis [ 113 ] and Lunaria annua [ 114 ] are found to display natural photonic structures. Yet the studies using cellulose nanocrystals as a building block for photonic applications is vast.…”

Section: Chitin-based Materials For Future Advanced Technologiesmentioning

confidence: 99%

Understanding the structural diversity of chitins as a versatile biomaterial

Hou

Aydemir

Dumanlı

2021

Phil. Trans. R. Soc. A.

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Chitin is one of the most abundant biopolymers, and it has adopted many different structural conformations using a combination of different natural processes like biopolymerization, crystallization and non-equilibrium self-assembly. This leads to a number of striking physical effects like complex light scattering and polarization as well as unique mechanical properties. In doing so, chitin uses a fine balance between the highly ordered chain conformations in the nanofibrils and random disordered structures. In this opinion piece, we discuss the structural hierarchy of chitin, its crystalline states and the natural biosynthesis processes to create such specific structures and diversity. Among the examples we explored, the unified question arises from the generation of completely different bioarchitectures like the Christmas tree-like nanostructures, gyroids or helicoidal geometries using similar dynamic non-equilibrium growth processes. Understanding the in vivo development of such structures from gene expressions, enzymatic activities as well as the chemical matrix employed in different stages of the biosynthesis will allow us to shift the material design paradigms. Certainly, the complexity of the biology requires a collaborative and multi-disciplinary research effort. For the future's advanced technologies, using chitin will ultimately drive many innovations and alternatives using biomimicry in materials science. This article is part of the theme issue ‘Bio-derived and bioinspired sustainable advanced materials for emerging technologies (part 1)'.

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“…Unlike dies or pigments, these are observable colors due to light interaction with sub‐micron shapes present in structures as those found in plants, flowers, bird feathers, or insect shells. [ 123–125 ] Structural colors are the basis of chameleon's changing colors due to alterations in organized 3D lattices present on the skin ( Figure a). [ 126 ] In an approach to mimic nature, scientists have used similar strategies to generate and engineer structurally colored materials.…”

Section: Photonic Applications Of Hydrogel Structuresmentioning

confidence: 99%

Engineering Hydrogel‐Based Biomedical Photonics: Design, Fabrication, and Applications

et al. 2021

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Light guiding and manipulation in photonics have become ubiquitous in events ranging from everyday communications to complex robotics and nanomedicine. The speed and sensitivity of light–matter interactions offer unprecedented advantages in biomedical optics, data transmission, photomedicine, and detection of multi‐scale phenomena. Recently, hydrogels have emerged as a promising candidate for interfacing photonics and bioengineering by combining their light‐guiding properties with live tissue compatibility in optical, chemical, physiological, and mechanical dimensions. Herein, the latest progress over hydrogel photonics and its applications in guidance and manipulation of light is reviewed. Physics of guiding light through hydrogels and living tissues, and existing technical challenges in translating these tools into biomedical settings are discussed. A comprehensive and thorough overview of materials, fabrication protocols, and design architectures used in hydrogel photonics is provided. Finally, recent examples of applying structures such as hydrogel optical fibers, living photonic constructs, and their use as light‐driven hydrogel robots, photomedicine tools, and organ‐on‐a‐chip models are described. By providing a critical and selective evaluation of the field's status, this work sets a foundation for the next generation of hydrogel photonic research.

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Photonic paper: Multiscale assembly of reflective cellulose sheets in Lunaria annua

Cited by 13 publications

References 43 publications

Switchable Photonic Bio‐Adhesive Materials

Switchable Photonic Bio‐Adhesive Materials

Understanding the structural diversity of chitins as a versatile biomaterial

Engineering Hydrogel‐Based Biomedical Photonics: Design, Fabrication, and Applications

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