When nanocellulose meets diffraction grating: freestanding photonic paper with programmable optical coupling

Chu, Guang; Qu, Dan; Camposeo, Andrea; Pisignano, Dario; Zussman, Eyal

doi:10.1039/c9mh01485c

Cited by 35 publications

(35 citation statements)

References 51 publications

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“… 3 It is also straightforward to add functional properties, for example, for photonics applications. 4 In addition, many nanocellulose processing methods are scalable, 5 paving the way for large-scale, eco-friendly nanotechnologies. However, bottom-up approaches for nanocomposites preparation suffer two major challenges.…”

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confidence: 99%

Small Angle Neutron Scattering Shows Nanoscale PMMA Distribution in Transparent Wood Biocomposites

Chen

Nishiyama

et al. 2021

Nano Lett.

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Transparent wood biocomposites based on PMMA combine high optical transmittance with excellent mechanical properties. One hypothesis is that despite poor miscibility the polymer is distributed at the nanoscale inside the cell wall. Small-angle neutron scattering (SANS) experiments are performed to test this hypothesis, using biocomposites based on deuterated PMMA and “contrast-matched” PMMA. The wood cell wall nanostructure soaked in heavy water is quantified in terms of the correlation distance d between the center of elementary cellulose fibrils. For wood/deuterated PMMA, this distance d is very similar as for wood/heavy water (correlation peaks at q ≈ 0.1 Å –1 ). The peak disappears when contrast-matched PMMA is used, indeed proving nanoscale polymer distribution in the cell wall. The specific processing method used for transparent wood explains the nanocomposite nature of the wood cell wall and can serve as a nanotechnology for cell wall impregnation of polymers in large wood biocomposite structures.

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Small Angle Neutron Scattering Shows Nanoscale PMMA Distribution in Transparent Wood Biocomposites

Chen

Nishiyama

et al. 2021

Nano Lett.

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“…Hence, the increased particle concentration leads to structural arrest in the glass transition process. 23 − 27 However, the glassy state of liquid crystalline CNCs typically occurs at a narrow concentration range and quickly evolves into a casted film through solvent evaporation. 12 It is therefore not surprising that CNC colloidal glass induced by evaporative drying is kinetically metastable and difficult for steady-state research and utilization.…”

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confidence: 99%

Structural Arrest and Phase Transition in Glassy Nanocellulose Colloids

Chu

Vasilyev

et al. 2020

Langmuir

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From drying blood to oil paint, the developing of a glassy phase from colloids is observed on a daily basis. Colloidal glass is solid soft matter that consists of two intertwined phases: a random packed particle network and a fluid solvent. By dispersing charged rod-like cellulose nanoparticles into a water–ethylene glycol cosolvent, here we demonstrate a new kind of colloidal glass with a high liquid crystalline order, namely, two general superstructures with nematic and cholesteric packing states are preserved and jammed inside the glass matrix. During the glass formation process, structural arrest and phase transition occur simultaneously at high particle concentrations, yielding solid-like behavior as well as a frozen liquid crystal texture that is because of caging of the charged colloids through neighboring long-ranged repulsive interactions.

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“…[28][29][30] Upon evaporation, colloidal CNC particles spontaneously self-assemble into a cholesteric liquid crystal phase above critical concentration and further vitrify into solid film that retain the original helical structure, thereby yielding vivid structural color with tunable photonic band gap. [31,32] Owing to the nanometer-sized building blocks and robust selfassembly process, cholesteric ordered CNC can serve as versatile platform for material templating, [33,34] nanoimprinting, [35][36][37][38] matrix scaffolding, [39][40][41][42] and colloid assembly, [43][44][45][46] which can allow the construction of hierarchical photonic structures with precisely controlled light-matter interactions.…”

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confidence: 99%

Self‐Assembled Nanorods and Microspheres for Functional Photonics: Retroreflector Meets Microlens Array

Chu

Chen

Zhao

et al. 2021

Advanced Optical Materials

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Patterned micro/nanomaterials display efficient light management capabilities owing to their control of light propagation within multiscale periodic structures. Here a hierarchical photonic structure composed of polystyrene microspheres and cholesteric assembly of cellulose nanocrystals is described, acting as a polarization‐sensitive retroreflective coating and microlens array. Micropatterned photonic films are prepared by casting an aqueous cellulose nanocrystal suspension onto a monolayer of polystyrene microspheres substrate through evaporation‐assisted transfer imprinting lithography, integrating a bulk cholesteric matrix and patterned surface. By directing light at the as‐assembled polystyrene surface, an enhanced structural color develops from the circularly polarized light retroreflection. Whereas when light travelling across the photonic film, the transparent layer of polystyrene microspheres forms into plano‐convex microlens to converge the transmitted light into the focus plane and reduce centimeter‐scale illuminated image into a high‐fidelity miniaturized replica. This simple method, combining self‐assembly with imprinting lithography, is expected to pave the way for designing custom‐tailored optics with novel functions.

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When nanocellulose meets diffraction grating: freestanding photonic paper with programmable optical coupling

Abstract: Bio-inspired chiral nematic cellulose films with periodic surface grating structures exhibit optically programmable photonic–photonic coupling.

Cited by 35 publications

References 51 publications

Small Angle Neutron Scattering Shows Nanoscale PMMA Distribution in Transparent Wood Biocomposites

Small Angle Neutron Scattering Shows Nanoscale PMMA Distribution in Transparent Wood Biocomposites

Structural Arrest and Phase Transition in Glassy Nanocellulose Colloids

Self‐Assembled Nanorods and Microspheres for Functional Photonics: Retroreflector Meets Microlens Array

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