Bio-inspired intelligent structural color materials

Shang, Luoran; Zhang, Weixia; Xu, Ke; Zhao, Yuanjin

doi:10.1039/c9mh00101h

Cited by 221 publications

(163 citation statements)

References 145 publications

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“…The interpretative principles between the coloration and the period, anisotropy as well as orderliness, have provided great design possibilities for promising applications of novel devices, sensors, and optical encryption. [ 4–6 ] Moreover, the extensively developed processing techniques, ranging from conventional lithography, nanoimprinting, and colloidal self‐assembly, to the cutting‐edge manufacturing technologies of confined shearing, [ 7 ] two‐photon polymerization 3D printing, [ 8 ] and standing‐wave carving, [ 9 ] allow for scalable on‐demand fabrications of structural color materials. Through the regulation of nanostructures, unique optical properties of structural color materials could be achieved for specific functions, such as polarization dependence and smart responsive functions.…”

Section: Introductionmentioning

confidence: 99%

“…Herein, we present a review of recent progress in optical encryption and anticounterfeiting technology using structural color materials as photonic crystals, liquid crystals, and photonic glass. Structural color materials used for anticounterfeiting have been involved in some previous reviews focused on structural color materials or anticounterfeiting solely, [ 4–6 ] and this review is focused on the recent developments of structural color encryption techniques. In the following sections, a brief overview of different microstructures for inducing structural colors is presented first and the structure–property relationships are discussed in detail.…”

Section: Introductionmentioning

confidence: 99%

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Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

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275

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

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275

233

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“…The spacing, size, and shape of these nanostructures trap light resonantly, yielding the expression of a specific color. Morpho butterflies and beetles, among other insects, show vivid colors this way, and various studies have proven means of replicating this concept using synthetic approaches . Using additive manufacturing methods, structural color can be achieved by integrating fiber structures with an outer layer of microspheres which assemble into a color‐expressing photonic crystal structure .…”

Section: Introductionmentioning

confidence: 99%

3D‐Printed Microrobots with Integrated Structural Color for Identification and Tracking

Koepele

Guix

et al. 2020

Advanced Intelligent Systems

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The implementation of two‐photon polymerization (TPP) in the microrobotics community has permitted the fabrication of complex 3D structures at the microscale, creating novel platforms with potential biomedical applications for minimizing procedure invasiveness and diagnosis accuracy. Although advanced functionalities for manipulation and drug delivery tasks have been explored, one remaining challenge is achieving improved visualization, identification, and accurate closed‐loop control of microscale robots. To enable this, distinguishable identifying and trackable features must be included on the microrobot. Toward this end, the construction of micro‐ and nanoscale patterns using TPP is demonstrated for the first time on microrobot surfaces with the intent of mimicking color‐expressing nanostructures present on beetles or butterflies. The patterns provide identification and tracking targets due to their vivid color expression under visible light. Helical and rectangular microrobots are designed with the topical patterns and further functionalized with magnetic materials to be externally actuated by magnetic fields. Vision‐based tracking of a 20 μm × 30 μm colored feature on a 100 μm‐long helical microrobot using a fixed angular position light source during microrobotic motion is shown. This versatile structural color patterning approach shows great potential for the visual differentiation of various microrobots and tracking for improved closed‐loop control.

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Section: Introductionmentioning

confidence: 99%

“…Structural color, as an important consequence of the interaction of visible light due to the periodic photonic nanostructure, has been widely observed in many living organisms such as beetles, butterflies, chameleons, peacocks, etc. [1][2][3][4][5][6] Inspired by these natural examples, a series of photonic materials with dazzling structural colors has been fabricated. [7][8][9][10][11][12] Among them, structural color hydrogels, which are usually constructed by drawing intelligent hydrogels into colloidal crystals, have attracted www.advancedsciencenews.com www.small-methods.com…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Bilayer Structural Color Hydrogel Actuator with Multienvironment Responsiveness and Survivability

et al. 2019

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Inspired by the actuator mechanism of Venus flytrap leaves, presented is a bilayer structural color hydrogel actuator by employing a hybrid inverse opal scaffold to join the poly(acrylic acid‐co‐acrylamide) layer and the poly(N‐isopropylacrylamide) layer together. The nanostructure of the inverse opal scaffold imparts the bilayer hydrogel with brilliant structural color, which can show a reversible coloration switch during the structural change. An internal water distribution occurs in the composite bilayer hydrogel during the heating or cooling process because of the opposite thermo‐responsiveness of the two hydrogels. Thus, this intelligent soft material can work in various environments and break the limitation of aqueous media of most structural color hydrogels. In addition, the water transference of the bilayer hydrogel enables the material with bending/unbending deformations and hence a series of complex motions like screwing, catching, and releasing can be achieved. Attractively, with the integrating of graphene oxide, the hydrogel systems can even be imparted with near‐infrared remote responsiveness to both of their color change and 3D deformation. These features of the bioinspired bilayer structural color hydrogel indicate its potential values in a variety of intelligent soft material applications.

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Bio-inspired intelligent structural color materials

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

Cited by 221 publications

References 145 publications

Structural Color Materials for Optical Anticounterfeiting

Structural Color Materials for Optical Anticounterfeiting

3D‐Printed Microrobots with Integrated Structural Color for Identification and Tracking

Bioinspired Bilayer Structural Color Hydrogel Actuator with Multienvironment Responsiveness and Survivability

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