Bio-inspired angle-independent structural color films with anisotropic colloidal crystal array domains

Zhang, Zhuohao; Chen, Zhuoyue; Sun, Lingyu; Zhang, Xiaoxuan; Zhao, Yuanjin

doi:10.1007/s12274-019-2395-7

Cited by 53 publications

(44 citation statements)

References 42 publications

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“…Zhao and co‐workers reported a responsive bilayer anticounterfeit label based on both an angle‐dependent and an angle‐independent system. [ 67 ] The central pattern was formed by inverse opal PNIPAM/GO hydrogels templated from regular colloid crystals while the background was templated from a pollen particle‐doped colloid crystal with angle‐independent reflectance. The normal incident reflectance maxima of the two parts were controlled to be similar to each other.…”

Section: Strategies For Anticounterfeiting Via Structural Colorsmentioning

confidence: 99%

Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

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307

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The counterfeiting of goods is growing worldwide, affecting practically any marketable item ranging from consumer goods to human health. Anticounterfeiting is essential for authentication, currency, and security. Anticounterfeiting tags based on structural color materials have enjoyed worldwide and long‐term commercial success due to their inexpensive production and exceptional ease of percept. However, conventional anticounterfeiting tags of holographic gratings can be readily copied or imitated. Much progress has been made recently to overcome this limitation by employing sufficient complexity and stimuli‐responsive ability into the structural color materials. Moreover, traditional processing methods of structural color tags are mainly based on photolithography and nanoimprinting, while new processing methods such as the inkless printing and additive manufacturing have been developed, enabling massive scale up fabrication of novel structural color security engineering. This review presents recent breakthroughs in structural color materials, and their applications in optical encryption and anticounterfeiting are discussed in detail. Special attention is given to the unique structures for optical anticounterfeiting techniques and their optical aspects for encryption. Finally, emerging research directions and current challenges in optical encryption technologies using structural color materials is presented.

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Section: Strategies For Anticounterfeiting Via Structural Colorsmentioning

confidence: 99%

Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

Small

307

251

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“…[ 1–4 ] Inspired by these natural examples, researchers have long endeavored to develop materials, devices and technologies to mimic such functions. [ 5–9 ] Electrochromism is one of these enabling technologies, and describes the phenomenon whereby a material changes color or opacity when subject to an electric field. [ 5,9 ] Pioneering work on electrochromism was reported by Deb in 1969, [ 10 ] and electrochromic materials have since been used in a wide range of products, such as smart windows, [ 11–14 ] electronic papers, [ 15 ] optical shutters, [ 16,17 ] displays, [ 18,19 ] self‐darkening mirror devices, [ 20 ] and optical memories.…”

Section: Figurementioning

confidence: 99%

Mimicking Nature's Butterflies: Electrochromic Devices with Dual‐Sided Differential Colorations

et al. 2021

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Some butterfly species such as the orange oakleaf (Kallima inachus) have strikingly different colors on the dorsal (front) sides of their wings compared to those on the ventral (back) sides of their wings, which helps camouflage the butterflies from predators and attract potential mates. However, few human‐made materials, devices, and technologies can mimic such differential coloring for a long time. Here, a new type of Janus‐structured two‐sided electrochromic device is developed that, upon application of different voltages, exhibits a coloration state on one side that is distinctly different from that on the other side. This is achieved by inserting an optically thin (4–8 nm) metallic layer with a complex refractive index, such as a layer composed of tungsten, titanium, copper or silver, into typical electrochromic structures.

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“…(D) Images of plate‐like and rod‐like PDGI/PAAm gels with different observation angles. Reproduced with permission from the literatures [ 54,57–60 ]…”

Section: Structural Colormentioning

confidence: 99%

Aggregated structures and their functionalities in hydrogels

Cui

Gong

2021

Aggregate

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Biological soft tissues and hydrogels belong to the same category of soft and wet matter. Both of them are composed of polymer network and a certain amount of water, and permeable to small molecules. Biological tissues possess elaborated structures and exhibit outstanding functionalities. On the other hand, hydrogels are usually amorphous with poor functionality. In recent years, various hydrogels with robust functionalities have been developed by introducing aggregated structures into the gel networks, widely extend their applications in diverse fields, such as soft actuators, biological sensors, and structural biomaterials. Four strategies are usually used to fabricate aggregated structure into hydrogels, including molecular self‐assembling, microphase separation, crystallization, and inorganic additives. Different aggregated structures entail the gel very different functionalities. A simple aggregated structure is able to bring multiple functionalities and a combination of mechanical performances of the hydrogels. In this review, we describe the strategies used to construct aggerated structure in hydrogels and discuss about the close relation between the aggregated structure and functionality. We also highlight the role of nonequilibrium aggregated structure in fabricating hydrogels with dynamic memorizing‐forgetting behavior and point out the remaining challenges.

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Bio-inspired angle-independent structural color films with anisotropic colloidal crystal array domains

Cited by 53 publications

References 42 publications

Structural Color Materials for Optical Anticounterfeiting

Structural Color Materials for Optical Anticounterfeiting

Mimicking Nature's Butterflies: Electrochromic Devices with Dual‐Sided Differential Colorations

Aggregated structures and their functionalities in hydrogels

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