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A 3D Optical Metamaterial Made by Self‐Assembly
TLDR
A 3D optical metamaterial, based on the replication of a self-assembled block copolymer into gold, is demonstrated, which has a feature size that is two orders of magnitude smaller than the wavelength of visible light.
Digital Color in Cellulose Nanocrystal Films
TLDR
It is shown that the iridescent colors and the ordering of the individual nematic layers are strongly dependent on the polydispersity of the size distribution of the CNCs, and hence multidomain color formation in such bioinspired structural films.
The flower of Hibiscus trionum is both visibly and measurably iridescent.
TLDR
The flower of Hibiscus trionum has the potential to interact with its pollinators through iridescent signals produced by its cuticular diffraction grating, which is quantitatively characterized by spectrometric measurements with several square-millimetres of sample area illuminated.
Hierarchical Self-Assembly of Cellulose Nanocrystals in a Confined Geometry
TLDR
The developed methodology allows us to fabricate truly hierarchical solid-state architectures from the nanometer to the macroscopic scale using a renewable and sustainable biopolymer.
Genetic manipulation of structural color in bacterial colonies
TLDR
By structural and optical analysis, a detailed correlation of how genetic modifications alter structural color in bacterial colonies is obtained, which opens the way to genetic engineering of on-demand living optical materials, for use as paints and living sensors.
The Self‐Assembly of Cellulose Nanocrystals: Hierarchical Design of Visual Appearance
TLDR
The mechanisms underlying the formation of iridescent, vividly colored materials from colloidal liquid crystal suspensions of cellulose nanocrystals are reviewed and recent advances in structural control over the hierarchical assembly process are reported as a toolbox for the design of sophisticated optical materials.
Biomimetic layer-by-layer assembly of artificial nacre.
TLDR
This is the first successful attempt to replicate nacre, using CaCO(3), and presents a route to artificial nacre that mimics the natural layer-by-layer approach to fabricate a hierarchical crystalline multilayer material.
Pointillist structural color in Pollia fruit
TLDR
It is demonstrated that animals and plants have convergently evolved multilayer-based photonic structures to generate colors using entirely distinct materials.
Controlling the Photonic Properties of Cholesteric Cellulose Nanocrystal Films with Magnets
TLDR
This simple and yet powerful technique unlocks new possibilities in designing the visual appearance of such iridescent films, paving the way for the development of truly sustainable photonic pigments in coatings, cosmetics, and security labeling.
Disorder in convergent floral nanostructures enhances signalling to bees
TLDR
It is concluded that floral nanostructures have evolved, on multiple independent occasions, an effective degree of relative spatial disorder that generates a photonic signature that is highly salient to insect pollinators.
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