scholarly journals Enhancing the brightness and saturation of noniridescent structural colors by optimizing the grain size

2020 ◽  
Vol 2 (10) ◽  
pp. 4581-4590
Author(s):  
Ning Sun ◽  
Xianglei Liu ◽  
Yan Liu ◽  
Rui Zhao ◽  
Zhengzheng Xu ◽  
...  
Keyword(s):  
Grain Size ◽  
Photonic Crystal ◽  
Domain Size ◽  
Structural Color ◽  
Ordered Structure ◽  
High Brightness ◽  
Structural Colors

A non-iridescent structural color with high brightness and saturation is obtained by adjusting the domain size of the ordered structure of the photonic crystal.

scholarly journals Dynamic Colloidal Photonic Crystal Hydrogels with Self-Recovery and Injectability

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yue Ma ◽  
Peiyan He ◽  
Wanli Xie ◽  
Qiang Zhang ◽  
Weiling Yin ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Dynamic Characteristics ◽  
Colloidal Crystals ◽  
Self Healing ◽  
Proof Of Concept ◽  
Ordered Structure ◽  
Physical Damage ◽  
Periodic Nanostructures ◽  
Structural Colors ◽  
New Strategy

Simulation of self-recovery and diversity of natural photonic crystal (PC) structures remain great challenges for artificial PC materials. Motivated by the dynamic characteristics of PC nanostructures, here, we present a new strategy for the design of hydrogel-based artificial PC materials with reversible interactions in the periodic nanostructures. The dynamic PC hydrogels, derived from self-assembled microgel colloidal crystals, were tactfully constructed by reversible crosslinking of adjacent microgels in the ordered structure via phenylboronate covalent chemistry. As proof of concept, three types of dynamic colloidal PC hydrogels with different structural colors were prepared. All the hydrogels showed perfect self-healing ability against physical damage. Moreover, dynamic crosslinking within the microgel crystals enabled shear-thinning injection of the PC hydrogels through a syringe (indicating injectability or printability), followed by rapid recovery of the structural colors. In short, in addition to the great significance in biomimicry of self-healing function of natural PC materials, our work provides a facile strategy for the construction of diversified artificial PC materials for different applications such as chem-/biosensing, counterfeit prevention, optical display, and energy conversion.

scholarly journals Angle-dependent structural colors in a nanoscale-grating photonic crystal fabricated by reverse nanoimprint technology

2019 ◽  
Vol 10 ◽  
pp. 1211-1216 ◽  
Author(s):  
Xu Zheng ◽  
Qing Wang ◽  
Jinjin Luan ◽  
Yao Li ◽  
Ning Wang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Nanoimprint Lithography ◽  
Structural Parameters ◽  
Visible Spectrum ◽  
Blue Shift ◽  
Structural Color ◽  
Observation Angle ◽  
Peak Wavelength ◽  
Structural Colors ◽  
Entire Visible Spectrum

The structural color of angle-sensitive photonic crystals has attracted great interest because of a possible application in visual sensors. The appearance of a photonic crystal is mainly influenced by the optical properties, structural parameters and the observation angle. In this work, an angle-sensitive photonic crystal with nanoscale gratings was fabricated through reverse nanoimprint lithography. The periodicity and the structural color were investigated through measuring reflection spectra. The structural color of the photonic crystal has a period of 90°. Distinctive colors spanning the entire visible spectrum can be seen when the crystal is rotated. In addition, there is a blue-shift of the peak wavelength when the observation angle is increased. An equation for the observed wavelength as a function of the observation angle is proposed.

scholarly journals Iridescence in nematics: Photonic liquid crystals of nanoplates in absence of long-range periodicity

2019 ◽  
Vol 116 (37) ◽  
pp. 18322-18327 ◽  
Author(s):  
Minxiang Zeng ◽  
Daniel King ◽  
Dali Huang ◽  
Changwoo Do ◽  
Ling Wang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Broad Spectrum ◽  
Carbon Nanoparticles ◽  
Orientational Order ◽  
Colloidal Dispersion ◽  
Structural Color ◽  
Ordered Structure ◽  
Photonic Structure ◽  
Photonic Materials ◽  
Structural Colors

Photonic materials with positionally ordered structure can interact strongly with light to produce brilliant structural colors. Here, we found that the nonperiodic nematic liquid crystals of nanoplates can also display structural color with only significant orientational order. Owing to the loose stacking of the nematic nanodiscs, such colloidal dispersion is able to reflect a broad-spectrum wavelength, of which the reflection color can be further enhanced by adding carbon nanoparticles to reduce background scattering. Upon the addition of electrolytes, such vivid colors of nematic dispersion can be fine-tuned via electrostatic forces. Furthermore, we took advantage of the fluidity of the nematic structure to create a variety of colorful arts. It was expected that the concept of implanting nematic features in photonic structure of lyotropic nanoparticles may open opportunities for developing advanced photonic materials for display, sensing, and art applications.

scholarly journals Investigation of Polystyrene-Based Microspheres from Different Copolymers and Their Structural Color Coatings on Wood Surface

Coatings ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 14
Author(s):  
Yi Liu ◽  
Jing Hu
Keyword(s):  
Photonic Crystal ◽  
Acrylic Acid ◽  
Wood Surface ◽  
Self Assembly ◽  
Morphological Characteristics ◽  
Structural Color ◽  
Uniform Structure ◽  
Chemical Compositions ◽  
Properties Of Coatings ◽  
Structural Colors

Six kinds of polystyrene (PSt)-based colloidal microspheres were synthesized by adding acrylic acid (AA), methyl methacrylate (MMA), and butyl acrylate (BA) as comonomers in styrene emulsion polymerization. The structurally colored coatings on a wood surface were self-assembled by thermally assisted gravity deposition of these microspheres. Chemical compositions and structures of microspheres and morphological characteristics of microspheres and structural color coatings, as well as optical properties of coatings and their generated structural colors, were studied. Pure PSt microspheres had a smooth surface and uniform structure, while microspheres of copolymers had core–shell morphologies and a rough surface. Only poly(styrene-acrylic acid) (P(St-AA)) microspheres had good monodispersity and the resulting coating had a well-ordered photonic crystal structure. However, other kinds of microspheres could form short ranges of ordered amorphous photonic crystal structures and they displayed structural colors. Both the reflectivity of coatings to visible light and structural colors varied with microsphere size and self-assembly temperature.

Photonic Crystal Palette of Binary Block Copolymer Blends for Full Visible Structural Color Encryption

2021 ◽  
pp. 2103697
Author(s):  
Hongkyu Eoh ◽  
Youngdoo Jung ◽  
Chanho Park ◽  
Chang Eun Lee ◽  
Tae Hyun Park ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Block Copolymer ◽  
Structural Color ◽  
Copolymer Blends

Easy preparation of anodic aluminum oxide photonic crystal films with tunable structural colors

2021 ◽  
Vol 122 ◽  
pp. 111722
Author(s):  
Hongyang Wei ◽  
Qing Xu ◽  
Dongchu Chen ◽  
Min Chen ◽  
Menglei Chang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Structural Colors ◽  
Anodic Aluminum ◽  
Crystal Films

Low Vertical Devergence Angle and High Brightness Photonic Crystal Semiconductor Laser

2017 ◽  
Vol 44 (2) ◽  
pp. 0201010 ◽  
Author(s):  
周旭彦 Zhou Xuyan ◽  
赵少宇 Zhao Shaoyu ◽  
马晓龙 Ma Xiaolong ◽  
刘 云 Liu Yun ◽  
李伦华 Li Lunhua ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Semiconductor Laser ◽  
High Brightness

Double-lattice photonic-crystal resonators enabling high-brightness semiconductor lasers with symmetric narrow-divergence beams

2018 ◽  
Vol 18 (2) ◽  
pp. 121-128 ◽  
Author(s):  
Masahiro Yoshida ◽  
Menaka De Zoysa ◽  
Kenji Ishizaki ◽  
Yoshinori Tanaka ◽  
Masato Kawasaki ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Semiconductor Lasers ◽  
High Brightness

scholarly journals Stomatocyte structural color-barcode micromotors for multiplex assays

2019 ◽  
Vol 7 (3) ◽  
pp. 644-651 ◽  
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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