Iridescence-controlled and flexibly tunable retroreflective structural color film for smart displays

Wen Fan; Jing Zeng; Qiaoqiang Gan; Dengxin Ji; Haomin Song; Wenzhe Liu; Lei Shi; Limin Wu

doi:10.1126/sciadv.aaw8755

Iridescence-controlled and flexibly tunable retroreflective structural color film for smart displays

Science Advances ◽

10.1126/sciadv.aaw8755 ◽

2019 ◽

Vol 5 (8) ◽

pp. eaaw8755 ◽

Cited By ~ 21

Author(s):

Wen Fan ◽

Jing Zeng ◽

Qiaoqiang Gan ◽

Dengxin Ji ◽

Haomin Song ◽

...

Keyword(s):

Traffic Safety ◽

White Light ◽

Energy Efficient ◽

Diffuse Reflection ◽

Structural Color ◽

Polymer Microspheres ◽

Color Film ◽

Reflective Displays ◽

Structural Colors

Structural color materials, which use nano- or microstructures to reflect specific wavelengths of ambient white light, have drawn much attention owing to their wide applications ranging from optoelectronics, coatings, to energy-efficient reflective displays. Although various structural color materials based on specular or diffuse reflection have been demonstrated, neither efficient retroreflective structural colors nor iridescent and non-iridescent colors to different observers simultaneously were reported by existing artificial or natural structural color materials. Here, we show that by partially embedding a monolayer of polymer microspheres on the sticky side of a transparent tape, the spontaneously formed interferometric structure on the surface of air-cushioned microspheres can lead to unique structural colors that remain non-iridescent under coaxial illumination and viewing conditions, but appear iridescent under noncoaxial illumination and viewing conditions. Our findings demonstrate a smart, energy-efficient, and tunable retroreflective structural color material that is especially suitable for nighttime traffic safety and advertisement display applications.

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Stomatocyte structural color-barcode micromotors for multiplex assays

National Science Review ◽

10.1093/nsr/nwz185 ◽

2019 ◽

Vol 7 (3) ◽

pp. 644-651 ◽

Cited By ~ 5

Author(s):

Lijun Cai ◽

Huan Wang ◽

Yunru Yu ◽

Feika Bian ◽

Yu Wang ◽

...

Keyword(s):

Biomedical Applications ◽

Colloidal Crystal ◽

Structural Color ◽

Multiplex Detection ◽

Color Coding ◽

Functional Elements ◽

Structural Colors ◽

Multiplex Assays ◽

Magnetic Elements ◽

Extracting Solvent

Abstract Artificial micromotors have a demonstrated value in the biomedical area. Attempts to develop this technology tend to impart micromotors with novel functions to improve the values. Herein, we present novel structural color-barcode micromotors for the multiplex assays. We found that, by rapidly extracting solvent and assembling monodispersed nanoparticles in droplets, it could form stomatocyte colloidal crystal clusters, which not only showed striking structural colors and characteristic reflection peaks due to their ordered nanoparticles arrangement, but also provided effective cavities for the integration of functional elements. Thus, the micromotors with catalysts or magnetic elements in their cavities, as well as with the corresponding structural color coding, could be achieved by using the platinum and ferric oxide dispersed pre-gel to fill and duplicate the stomatocyte colloidal crystal clusters. We have demonstrated that the self-movement of these structural color-barcode micromotors could efficiently accelerate the mixing speed of the detection sample and greatly increase the probe–target interactions towards faster and more sensitive single or multiplex detection, and the magnetism of these barcode micromotors enables the flexible collection of the micromotors, which could facilitate the detection processes. These features make the stomatocyte structural color-barcode micromotors ideal for biomedical applications.

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Anisotropic structural color particles from colloidal phase separation

Science Advances ◽

10.1126/sciadv.aay1438 ◽

2020 ◽

Vol 6 (2) ◽

pp. eaay1438 ◽

Cited By ~ 21

Author(s):

Huan Wang ◽

Yuxiao Liu ◽

Zhuoyue Chen ◽

Lingyu Sun ◽

Yuanjin Zhao

Keyword(s):

Colloidal Crystal ◽

Structural Color ◽

Inverse Opal ◽

Phase Separations ◽

Structural Colors ◽

Structure Morphology ◽

Dynamic Cell ◽

Cell Monitoring ◽

Colloid Nanoparticles ◽

Component Phase

Structural color materials have been studied for decades because of their fascinating properties. Effects in this area are the trend to develop functional structural color materials with new components, structures, or morphologies for different applications. In this study, we found that the coassembled graphene oxide (GO) and colloid nanoparticles in droplets could form component phase separations, and thus, previously unknown anisotropic structural color particles (SCPs) with hemispherical colloidal crystal cluster and oblate GO component could be achieved. The anisotropic SCPs, as well as their inverse opal hydrogel derivatives, were endowed with brilliant structural colors and controllable capabilities of fixation, location, orientation, and even responsiveness due to their specific structure, morphology, and components. We have also demonstrated that the anisotropic hydrogel SCPs with these features were ideal candidates for dynamic cell monitoring and sensing. These properties indicate that the anisotropic SCPs and their derivatives have huge potential values in biomedical areas.

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How to Tailor Structural Colors for Extended Visibility and White Light Generation Employing Direct Laser Interference Patterning

Macromolecular Chemistry and Physics ◽

10.1002/macp.201970025 ◽

2019 ◽

Vol 220 (13) ◽

pp. 1970025 ◽

Cited By ~ 1

Author(s):

Sebastian Storm ◽

Sabri Alamri ◽

Marcos Soldera ◽

Tim Kunze ◽

Andrés Fabián Lasagni

Keyword(s):

White Light ◽

Laser Interference ◽

Structural Colors ◽

White Light Generation ◽

Direct Laser ◽

Light Generation ◽

Direct Laser Interference Patterning

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Rapid active-reflection display on dorsal stripes of Atherinomorus lacunosus

10.1101/2021.02.15.431186 ◽

2021 ◽

Author(s):

Masakazu Iwasaka

Keyword(s):

Magnetic Field ◽

Light Exposure ◽

Low Energy ◽

Intensity Change ◽

Structural Color ◽

Dorsal Part ◽

Structural Colors ◽

Environmental Light ◽

Low Energy Consumption ◽

Detailed Function

AbstractA large number of living creatures are able to use environmental light effectively as a biological display. The biological structural colors are very attractive not only within the coloring species but also to humans. However, the detailed function of bio-reflectors, which constitute the structural color with respect to communication, remains unknown. Atherinomorus lacunosus has alignments of iridophore spots on its dorsal part. Here it is found that a spot with a diameter of approximately 0.1 mm causes a rhythmic blinking of light owing to rapid reflection changes in iridophores existing inside the spot. The iridophores contain reflecting particles which show similar rotational responses to magnetic field under a light exposure. The speed of the intensity change of light at a frequency of approximately 1 Hz is proposed to be controlled by the nervous system of A. lacunosus. This kind of passive illumination may contribute to the development of a new optical device with low energy consumption.

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Intelligent centralized traffic management of a rapid transit system under heavy traffic

Dependability ◽

10.21683/1729-2646-2021-21-2-17-23 ◽

2021 ◽

Vol 21 (2) ◽

pp. 17-23

Author(s):

L. A. Baranov ◽

V. G. Sidorenko ◽

E. P. Balakina ◽

L. N. Loginova

Keyword(s):

Genetic Algorithms ◽

Energy Consumption ◽

Control Theory ◽

Traffic Safety ◽

Energy Efficient ◽

Traffic Management ◽

Design Principles ◽

Rapid Transit ◽

Traffic Planning ◽

Transit System

Aim. In today’s major cities, increased utilization and capacity of the rapid transit systems (metro, light rail, commuter trains with stops within the city limits) – under condi[1]tions of positive traffic safety – is achieved through smart automatic train traffic management. The aim of this paper is to choose and substantiate the design principles and architecture of such system.Methods. Using systems analysis, the design principles and architecture of the system are substantiated. Genetic algorithms allow automating train traffic planning. Methods of the optimal control theory allow managing energy-efficient train movement patterns along open lines, assigning individual station-to-station running times following the principle of mini[1]mal energy consumption, developing energy-efficient target traffic schedules. Methods of the automatic control theory are used for selecting and substantiating the train traffic algorithms at various functional levels, for constructing random disturbance extrapolators that minimize the number of train stops between stations.Results. Development and substantiation of the design principles and architecture of a centralized intelligent hierarchical system for automatic rapid transit traffic management. The distribution of functions between the hierarchy levels is described, the set of subsystems is shown that implement the purpose of management, i.e., ensuring traffic safety and comfort of passengers. The criteria are defined and substantiated of management quality under compensated and non-compensated disturbances. Traffic management and target scheduling automation algorithms are examined. The application of decision algorithms is demonstrated in the context of uncertainty, use of disturbance prediction and genetic algorithms for the purpose of train traffic planning automation. The design principles of the algorithms of traffic planning and management are shown that ensure reduced traction energy consumption. The efficiency of centralized intelligent rapid transit management system is demonstrated; the fundamental role of the system in the digitalization of the transport system is noted.Conclusion. The examined design principles and operating algorithms of a centralized intelligent rapid transit management system showed the efficiency of such systems that ensured by the following: increased capacity of the rapid transit system; improved energy efficiency of train traffic planning and management; improved train traffic safety; assurance of operational traffic management during emergencies and major traffic disruptions; improved passenger comfort.

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Development of New Catalytic Pigments: Dual Functional SiO2/TiO2-x Amorphous Photonic Crystals for Non-Iridescent Structural Color and Enhanced Photocatalytic Activity

10.21203/rs.3.rs-853239/v1 ◽

2021 ◽

Author(s):

Li Feng ◽

Fen Wang ◽

Ze Xu ◽

Hongjie Luo ◽

Ting Zhao ◽

...

Keyword(s):

Photocatalytic Activity ◽

Photonic Crystals ◽

Slow Light ◽

Scattered Light ◽

Biomimetic Synthesis ◽

Structural Color ◽

Utilization Rate ◽

Full Spectrum ◽

Structural Colors ◽

Color Saturation

Abstract Biomimetic synthesis of amorphous photonic crystals (APCs) is a significant approach to obtain non-iridescent structural colors. However, the structural colors of artificially prepared APCs are dim or even white due to the influence of incoherent scattering. In this paper, we present an innovative method was proposed to combine APCs with black TiO2-x to construct non-iridescent structural color pigments with high visibility and photocatalytic activity. Due to absorption of incoherent scattered light by black TiO2-x, the color saturation of structural colors has been significantly increased. In addition, the utilization rate of photogenic carriers was effectively enhanced by slow light effect generated from pseudo-band gap of SiO2 APCs with TiO2-x absorbed full spectrum. The tone and color saturation of catalytic pigments are controlled by the diameter of SiO2 nanospheres and the ration of TiO2-x nanoparticles, which provides a controllable application study in color related fields such as artwork, environmental coatings and textiles.

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Structural color printing with a dielectric layer coated on a nanotextured metal substrate: simulation and experiment

Nanoscale Advances ◽

10.1039/c9na00321e ◽

2019 ◽

Vol 1 (10) ◽

pp. 4090-4098

Author(s):

Minseok Seo ◽

Heungyeol Lee ◽

Hohyeong Kim ◽

Myeongkyu Lee

Keyword(s):

Stainless Steel ◽

Dielectric Layer ◽

Metal Substrate ◽

Structural Color ◽

Structural Colors ◽

Simulation And Experiment ◽

Color Printing

Vivid structural colors are produced by texturing the surface of stainless steel and coating it with a dielectric layer.

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Transmissive/Reflective Structural Color Filters: Theory and Applications

Journal of Nanomaterials ◽

10.1155/2014/212637 ◽

2014 ◽

Vol 2014 ◽

pp. 1-17 ◽

Cited By ~ 10

Author(s):

Yan Yu ◽

Long Wen ◽

Shichao Song ◽

Qin Chen

Keyword(s):

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Recent Progress ◽

Image Sensors ◽

Cavity Resonance ◽

Structural Color ◽

Color Selection ◽

Structural Colors ◽

Cmos Image Sensors ◽

Color Filters

Structural color filters, which obtain color selection by varying structures, have attracted extensive research interest in recent years due to the advantages of compactness, stability, multifunctions, and so on. In general, the mechanisms of structural colors are based on the interaction between light and structures, including light diffraction, cavity resonance, and surface plasmon resonance. This paper reviews recent progress of various structural color techniques and the integration applications of structural color filters in CMOS image sensors, solar cells, and display.

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Structural colors of fabric from Ag/TiO2 composite films prepared by magnetron sputtering deposition

International Journal of Clothing Science and Technology ◽

10.1108/ijcst-04-2016-0038 ◽

2017 ◽

Vol 29 (3) ◽

pp. 427-435 ◽

Cited By ~ 7

Author(s):

Xiaohong Yuan ◽

Wenzheng Xu ◽

Fenglin Huang ◽

Qingqing Wang ◽

Qufu Wei ◽

...

Keyword(s):

Magnetron Sputtering ◽

Theoretical Calculation ◽

Photoelectron Spectroscopy ◽

Composite Films ◽

Structural Color ◽

Chemical Compositions ◽

Content Type ◽

Structural Colors ◽

Environmental Friendly ◽

Dyes And Pigments

Purpose Structural color is more brilliant in color, more resistant to sunshine and will not fade away with time, and more environmental friendly than traditional dyes and pigments. The purpose of this paper is to prepare structural colors of fabrics coated with Ag/TiO2 composite films by magnetron sputtering, and analyze the relationship between the colors and the thicknesses of TiO2 films in Ag/TiO2 composite films. Design/methodology/approach Preparation of Ag/TiO2 composite films by magnetron sputtering and their deposition on textiles were investigated. The chemical compositions and surface morphology of Ag/TiO2 composite films were examined by X-ray photoelectron spectroscopy and scanning electron microscopy, and the structural color of fabric coated with Ag/TiO2 composite film was also analyzed. Findings Ag/TiO2 composite films deposited on textile substrate exhibited structural colors, and the bright colors could be adjusted and controlled by the thickness of TiO2 thin films in Ag/TiO2 composite films without any dyes or pigments. By comparing the results of theoretical calculation and experimental results, it was found that the creation of structural colors by the experiment was coincident to the colors by theoretical calculation according to the film interference principle. There was a linear relationship between the thickness of TiO2 film and the wavelength of the structural color. Originality/value Compared to traditional coloration by dyes or pigments, the coloration of textile by structural color from Ag/TiO2 composite films prepared by magnetron sputtering was very environmental friendly and simple without water consuming, time consuming and tedious work. Structural colors have great potential applications in textiles in place of traditional dyes and pigments. Furthermore, the textiles coated with Ag/TiO2 composite films have good electrical, optical and magnetic properties, and can be used in apparel, home furnishings and industrial fabrics.

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