Supramolecular Photonic Elastomers with Brilliant Structural Colors and Broad‐Spectrum Responsiveness

Li, Miaomiao; Tan, Haiying; Jia, Lizhen; Zhong, Rui; Peng, Bolun; Zhou, Jiacheng; Xu, Jiangping; Xiong, Bijin; Zhang, Lianbin; Zhu, Jintao

doi:10.1002/adfm.202000008

Cited by 60 publications

(67 citation statements)

References 54 publications

(39 reference statements)

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“…More importantly, their structural colors are angle-independent which effectively avoids color confusion. APCs can be embedded in or constructed by responsive materials with optical signals modulated in response to external stimuli, including mechanical deformation, 29,180 temperature, 30,166,170 light, 24,75 humidity, 21, 23 magnetic 28,82 and electric fields. 19,41 In addition, the combination of non-iridescent properties of APCs and iridescent structural colors of PCs provides new ideas for anti-counterfeit labels.…”

Section: Applications Of Apcsmentioning

confidence: 99%

“…10a). 180 Kim et al prepared mechanically discolored APC elastomers by studying the assembly of bi-dispersed colloidal particles in PEGPEA resin. 147,153 Some of the APC elastomers with self-healing properties will be fully utilized in colorimetric sensors.…”

Section: Sensorsmentioning

confidence: 99%

“…147,153 Some of the APC elastomers with self-healing properties will be fully utilized in colorimetric sensors. 29,180,181 Takeoka et al prepared APCs by assembling soft particles with temperature-sensitive shell which caused reversible changes of reflection peaks with temperature. 166 To develop a temperatureresponsive chromatic sensor, they constructed the porous PNIPA hydrogels in APCs structure by dipping PNIPA into SiO 2 amorphous array templates and removing the templates by etching.…”

Section: Sensorsmentioning

confidence: 99%

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Self-assembly of colloidal particles into amorphous photonic crystals

Zhang

Yang

et al. 2021

Mater. Adv.

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Section: Applications Of Apcsmentioning

confidence: 99%

Section: Sensorsmentioning

confidence: 99%

Section: Sensorsmentioning

confidence: 99%

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Self-assembly of colloidal particles into amorphous photonic crystals

Zhang

Yang

et al. 2021

Mater. Adv.

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“…[14][15][16][26][27][28] Although these periodic structures exhibit high wavelength selectivity, the iridescent nature of the revealed color and the difficulty in maintaining periodicity over a large area limit the practical application of these structures. Photonic glasses with a short-range order may exhibit angle-independent colors; [30][31][32] however, their reflection spectra are extremely broad with low reflectivity, thereby leading to weak and dark colors. In this study, a Fabry-Perot (F-P) resonator structure comprising As metals form the backbone of many engineering structures including bridges and buildings, the detection of their mechanical deformation is of technological importance.…”

Section: Colorimetric Detection Of Mechanical Deformation In Metals Using Thin-film Mechanochromic Sensormentioning

confidence: 99%

Colorimetric Detection of Mechanical Deformation in Metals using Thin‐Film Mechanochromic Sensor

Bae

Seo

Lee

et al. 2021

Adv Materials Technologies

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tively captured during deformation using one or more cameras, and the obtained digital image data (a series of photos) are analyzed using the DIC software. The displacements and strains of individual regions are determined by correlating the position of pixel subsets in the images, typically based on contrast (i.e., gray intensity levels). Combined with scanning electron microscopy (SEM), DIC can also be used to monitor microstructural changes in metals during deformation. [7][8][9] For DIC to work effectively, the surface of the specimen must have a random pattern. It is generally obtained by spraying black and white paint onto the specimen surface. Although DIC is an effective technique for generating full-field strain maps, its use in outdoor environments is challenging because a permanent setup is required for multiple measurements at different stages of deformation. There is a need for measurement techniques that can be easily implemented, and are highly accurate.In this study, we present a colorimetric method for measuring mechanical deformation in metals. This method is based on the color change in an attached thin-film mechanochromic sensor. The goal of this study is to develop a cost-effective and feasible technique for structural health monitoring. If mechanochromic sensors are attached to the surfaces of a metallic engineering structure, as shown in Figure 1a, the damage to the structure can be identified by the color changes in the sensor. This approach significantly helps prevent disasters by forecasting the potential failure of a structure. Sensors invisible to the naked eye may be captured using a camera with a telescopic lens. Difficult-to-access areas can be monitored using drones. Despite numerous, recent studies on mechanochromic sensors and their applications, [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] the quantitative measurement of mechanical deformation in metals through the use of mechanochromic sensors has not yet been reported. Many mechanochromic sensors developed to date employ periodic structures such as photonic crystals and surface relief patterns. [14][15][16][26][27][28] Although these periodic structures exhibit high wavelength selectivity, the iridescent nature of the revealed color and the difficulty in maintaining periodicity over a large area limit the practical application of these structures. Photonic glasses with a short-range order may exhibit angle-independent colors; [30][31][32] however, their reflection spectra are extremely broad with low reflectivity, thereby leading to weak and dark colors. In this study, a Fabry-Perot (F-P) resonator structure comprising

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“…PCs are periodic structures and they show angle‐dependent colors. Although PCs with short‐range order exhibit angle‐independent structural color, [ 25–27 ] the reflection spectra of these photonic glasses are very broad with low reflectivity (<40%), thus leading to weak and dark colors.…”

Section: Introductionmentioning

confidence: 99%

Angle‐Insensitive Fabry–Perot Mechanochromic Sensor for Real‐Time Structural Health Monitoring

Bae

Seo

Lee

et al. 2021

Adv Materials Technologies

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Colorimetric sensors that respond to mechanical stimuli have garnered increased attention for various applications such as healthcare, display, electronic skin, and camouflage. To date, these mechanochromic sensors have been largely fabricated and studied with periodic structures such as surface relief patterns and photonic crystals. Although periodic structures can provide high wavelength selectivity, the strong viewing‐angle‐dependence of the color hinders their practical application in indoor and outdoor environments. Herein, a Fabry–Perot (F–P) interferometer composed of an elastomeric triblock copolymer as a dielectric spacer sandwiched between two metal layers is presented as an angle‐insensitive mechanochromic sensor. The planar structure of this device, formed on a flexible substrate, can be stretched to strains greater than 100%, and it reveals diverse colors according to the applied strain. The revealed colors are highly independent of the viewing angle, as confirmed both experimentally and theoretically. The developed sensor can be attached to any material including metals to visually detect mechanical failures (cracking, cleavage, and deformation) of the material. Therefore, this F–P mechanochromic sensor shows significant potential for real‐time structural health monitoring.

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Supramolecular Photonic Elastomers with Brilliant Structural Colors and Broad‐Spectrum Responsiveness

Cited by 60 publications

References 54 publications

Self-assembly of colloidal particles into amorphous photonic crystals

Self-assembly of colloidal particles into amorphous photonic crystals

Colorimetric Detection of Mechanical Deformation in Metals using Thin‐Film Mechanochromic Sensor

Angle‐Insensitive Fabry–Perot Mechanochromic Sensor for Real‐Time Structural Health Monitoring

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