LIQUID CRYSTALS
·
2024
·
IF 2.4
Jinghua Zhao,Yajie Yang,Limin Wu,Wei Liu,Yi Li,Yonggang Yang
Both the colourful cholesteric liquid crystal polymer network (CLCN) patterns and the gratings have attracted much attention for their applications as optical materials. Herein, the photochromic cholesteric liquid crystal (CLC) mixtures were prepared using a photoisomerizable chiral dopant. The structural colour of the CLC mixtures was tunable by changing the chiral dopant concentration and the intensity of the 365-nm irradiation light. The CLCN gratings with a structural colour were prepared using the UV nanoimprinting lithography method. The structural colours of the CLCN gratings originate from both the cholesteric and the grating structures. Moreover, a patterned CLCN grating was prepared using a photochromic CLC mixture, which could be applied for decoration and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 10
·4598-4605
·
IF 2.7
Yongxing Guo,Jinghua Zhao,Limin Wu,Wei Liu,Yi Li,Yonggang Yang
Cholesteric liquid crystal polymer network (CLCN) films have attracted much attention for their applications as optical filters and in displays, decoration, and anti-counterfeiting. Herein, two pairs of chiral bola-type epoxy liquid crystals with a cholesteric mesophase were synthesized. Their mixtures exhibit thermochromic behaviour. CLCN films with structural colours were prepared using their mixtures through photopolymerization. The Bragg reflection band and the handedness of the CLCN film can be controlled by changing the weight ratio of the chiral liquid crystals. Patterned CLCN films were prepared based on their thermochromic behaviour, the addition of a luminescent compound, or the handedness of the liquid crystal mixture, and they were potentially applied in decoration and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xinyang Li,Litao Tu,Wanyang Sun,Xiaohui Wang,Yichen Li,Guojin Liu,Liqin Chai,Yi Huang,Minghua Wu,Jianzhong Shao
Biomimetic structural coloration with photonic crystals (PCs) possesses the advantages of eco-friendly coloration, brilliant structural colors, and high colorfastness to light, etc. It is appealing for advanced coloration of various substrate surfaces. However, the fabrication of PCs with iridescent effect and high colorfastness on three-dimensional (3D) irregular substrate surfaces is still challenging. In this work, liquid photonic crystals (LPCs) with high mass fraction (40 wt.%) of colloidal nanospheres were used as the spraying solution to assemble long-range ordered PCs with iridescent effect. Thanks to the fluidity and dynamic reversibility, the pre-crystallized LPCs could disassemble under the applied spraying pressure, which promoted smooth spraying and enabled the formation of atomized micro-droplets. The colloidal nanospheres present in these micro-droplets were able to quickly reassemble and restore their pre-crystallized state. This allowed micro-droplets to connect with each other on the curved or 3D irregulated substrate surface into orderly assembled solid PCs upon the water evaporation, exhibiting brilliant structural colors with iridescent effect. Meanwhile, the use of the spraying solution with high mass fraction of colloidal nanospheres was shown to be effective against the slipping problem of the micro-droplets on 3D substrate surfaces, enabling the fabrication of PCs with pronounced iridescent structural colors on various 3D substrate surfaces (metal, ceramic, rubber, glass and so on). In addition, pre-spraying a specific polymer slurry to form a bearing layer on the 3D substrate prior to spraying the LPC allows improving the stability of the assembled PC structure under external forces (rubbing, washing, etc.), while retaining the refractive index contrast of PCs and thus achieving the consistency between their structural stability and color saturation.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2024
·Vol. 17
·期 1
·1-14
·
IF 31.6
Wang Jingang,Yu Haibo,Zheng Jianchen,Zhang Yuzhao,Guo Hongji,Qiu Ye,Wang Xiaoduo,Yang Yongliang,Liu Lianqing
A 2.5-dimensional dynamic structural color based on nanogratings of heterogeneous materials was proposed by interweaving a pH-responsive hydrogel with IP-L photoresist.
The nanogrid structures exhibit brilliant tuneable structural color, high sensitivity, and ultrafast recovery speeds in response to pH.
The 4D printing-based grayscale design approach was proposed for the patterned encoding and array printing of dynamic structural colors, promoting their application in patterned printing, information encryption, and microfluidic chip sensing.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 31
·期 9
·2008601
·
IF 16.836
Chuan Wang,Xi Lin,Christian G. Schäfer,Stefan Hirsemann,Jianping Ge
It is a challenge to prepare photonic crystal (PC) automotive coatings via spraying colloidal solutions because the fast fabrication tends to produce amorphous photonic crystals with faint colors. Here, a two-step spraying process followed by thermal curing is developed to prepare waterproof PC coatings with bright, uniform, and angular-dependent structural colors. The solvents in PC paint are studied to achieve a quick formation of liquid PC intermediate, which transformed into a highly crystalline PC coating. Thanks to the narrow and intense reflections, the as-made coatings present colors with high saturation, including the red/yellow/green/blue colors achieved by tuning the particle size, and many spectral/non-spectral colors via the mixing of base colors. Meanwhile, patterned or fully covered PC coatings with good chemical and mechanical stability can be prepared on different substrates, where the shiny colors changing with the viewing angles or the surface curvatures offer a new choice for personalized automotive coatings.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 24
·2200330
·
IF 19.924
Yuying He,Luyao Liu,Qianqian Fu,Jianping Ge
It is a great challenge to prepare highly crystalline photonic crystal (PC)-modified fabrics with saturated colors without sacrificing the wearing experience, such as breathability and softness, at the same time. Here, a spray coating process is developed to precisely assemble the colloidal PCs inside every yarn of the polyester (PET) fabric. High surface tension and high boiling point for the solvent of colloidal solution, as well as low twist angle, large weave cycles, and large tightness for the fabric substrate, are found to be favorable to the formation of high-quality PC-modified fabrics. In addition, the as-prepared PC/PET fabrics have saturated and durable colors thanks to the highly crystalline PC structures and the polyacrylate adhesives. They also possess good softness and high breathability as the precise colloidal assembly in the yarn avoids the blocking of weaving holes and cracks.
研究领域:
材料科学
·
纺织工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Xiaoxiang Wen,Xuegang Lu,Chaoping Wei,Jianing Li,Yanlin Li,Sen Yang
Bright structural colors with an angular-independent character are in increasing demand in many fields such as pigments, buildings, sensors, color displays, and anti-counterfeiting labels. However, the structural colors produced by amorphous colloidal assemblies with low refractive index contrast or without black additives often exhibit low color visibility and low liquid-bleaching resistibility. Herein, large-scale and angle-independent structural colors were constructed from Fe3O4@SiO2 colloidal quasi-amorphous arrays (QAAs) prepared through a rapid “spraying” process. Due to the high-refractive-index and intrinsic black nature of Fe3O4, the coatings exhibit high brightness of structural colors even on white substrates under ambient lighting conditions. Moreover, as-obtained structural colors possess the ability of antiliquid bleaching and solvent-responsiveness. More importantly, flexible Fe3O4@SiO2/PDMS photonic paper can be fabricated by permeation of PDMS into the voids of Fe3O4@SiO2 colloidal QAAs. This QAAs-based photonic paper shows the ability to infuse silicone oils into its structure, locally swelling it and changing the reflected color. In turn, the resulting colored patterns can be easily erased by applying ethanol or low molecular weight silicone oils. The as-prepared photonic paper exhibits excellent durability and is rewritable at least 50 times without any significant changes in performance. Compared with the traditional long-range ordered photonic crystals, the rapidly prepared QAAs-based photonic coatings have unique advantages in the applications of permanents, color coatings, color printing, liquid colorimetric sensors, rewritable photonic paper, etc. because of the good structural color performance and are suitable for rapid and large-area preparation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 16
·2210753
·
IF 29.4
Yong Qi,Liujun Song,Changtong Zhou,Shufen Zhang
Shape-memory photonic crystals (SMPCs) transform the nanoscale deformation of copolymers into structural color through an undifferentiated response to stimuli; however, activatable selective responses are extremely rare. Herein, activatable dual confined shape-memory effects (CSMEs) derived from the remodeling of the interchain hydrogen bonds (H-bonds) in cold-programmable SMPCs are revealed. The first level is the water-triggered reconstruction of interchain H-bonds, which can activate/lock the collapsed skeleton, showing shape recovery/retention in response to ethanol vapor. The second level is the pressure-induced reorganization of interchain H-bonds that results in the recovered skeleton being locked even when exposed to ethanol vapor or water, while the background porous structure can switch between collapse and recovery. Dual CSMEs result from the Laplace pressure difference and the binding effect of interchain H-bonds in the skeleton according to insights of swelling, in situ deformation tracking, multidimensional infrared spectra, and water wetting/evaporation simulations. The signal interference, source code extraction, and color enhancement of structurally colored patterns can be implemented using CSMEs. This work opens up a new method for fabricating activatable responsive structural color and contributes to the expansion of nanophotonic technology in water printing, erasable watermarks, signal amplifiers, and information coding.
研究领域:
材料科学
·
纳米光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 17
·3551
·
IF 5
Shu Yang,Hongming Xiang,Yingwen Wang,Kaikai Chen,Weihong Gao
Monodispersed polystyrene (PS) particles were prepared and deposited onto various kinds of textile fabrics using a gravity sedimentation method. The monodispersed PS particles were self-assembled on fabrics to form a photonic crystal, which has an iridescent structural color. The structural color of fabrics was determined by the bandgaps of photonic crystals. Moreover, the effect of the fabric substrate, including the raw materials, base color, and fabric weave, etc., on the structural color of the photonic crystals was studied. Scanning electron microscopy and UV-vis spectrometry were adopted to characterize the structure and optical performance of photonic crystals. The results indicate that the silk fabric with a black base color and satin weave contribute to a bright and pure textile structural color. In order to solve the problem of low color fastness of the structural color on the fabric surface, silk fibroin (SF) was introduced to the PS microsphere solution. Results show that the addition of SF slightly affects the brightness of the structural color, while it has a certain reinforcing effect on the structural color fastness to rubbing and washing.Keywords:photonic crystals;structural color;fabric substrate;silk fibroin;color fastness
研究领域:
材料科学
·
纺织工程
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2023
·Vol. 69
·期 12
·e18240
·
IF 3.7
Yaqun Han,Jingyuan Hu,Xingzuo Li,Yue Wu,Jie Ren,Shufen Zhang,Suli Wu
The problems of difficult dyeing, poor dyeing fastness, and dyeing pollution of aramid are always great obstacles in the practical application. In theory, constructing particular nanostructures instead of dyes on aramids to achieve bright structural colors will be an effective strategy. However, it is still challenging to construct particular nanostructures on aramid fabric surfaces because of their roughness. Here, beautiful and noniridescent structural colored aramids with excellent light fastness were achieved by spraying a thin layer of randomly distributed nanospheres on the surface of adhesive-modified aramids. Moreover, different bright structural colors and colorful patterns were obtained by simply controlling the size or refractive index of the spheres. Importantly, the light fastness of the structural colored aramid can reach levels 6–7 or higher. The simple and eco-friendly coloring technology can be compatible with industrial equipment to obtain stable multicolored aramid products, exhibiting great real potential applications.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Miao Kong,Ronghui Han,Xiaoyu Guo,Shufen Zhang,Yuang Zhang,Bingtao Tang
The structural color of photonic crystals has garnered considerable attention in the domains of coded information security and anticounterfeiting technology mechanisms. However, most alterations induced by structural color hinge on dynamic regulation triggered by external stimuli, limiting their utility in static settings. Herein, the polyvinylidene fluoride (PVDF) photonic films with a bilayer inverse opal structure are engineered to enable the display and concealment of coded messages contingent on the observer’s viewing angle. The inherent attributes of PVDF polymer confer upon photonic films high stability and flexibility, as confirmed through curling, friction, and tensile tests. Notably, the upper inverse opal structure layer serves as the background, while the bottom inverse opal structure layer functions as the pattern in these PVDF bilayer photonic films. Owing to angle dependence of the pattern layer and the shielding effect of the background layer, the pattern remains concealed at viewing angles above 45° and becomes visible at angles below 30°. These photonic films have been adapted for use in touch-tone numeric keypad protective patches by optimizing particle size and thickness parameters. According to these findings, the coded information security systems based on the angle dependence in highly ordered photonic crystal structures offer substantial promise for applications in static environments.
研究领域:
光学材料
·
信息安全
·
纳米技术
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanjing Sun,Yajuan Zhang,Wenchen Yu,Pan Jia,Xin Zhang,Na Wu,Haitao Yu,Yanlin Song,Jinming Zhou
Stretchable and self-healable structural-colored nanocomposite gelatin hydrogel with photonic structure of random dense/loose regions of non-close-packed silica nanoparticles (SiO 2 NPs) is developed via convenient and scalable polymer-mediated assembly. The formation of the special photonic structure with overall low SiO 2 NP content is characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The small-angle X-ray scattering test indicates the existence of short-range order, which is consistent with the TEM and SEM results. The dense photonic structure consisting of SiO 2 NP chains and domains, and the loose structure consisting of abundant solitary SiO 2 NPs, accounts for pronounced and uniform structural colors via combined effects of coherent scattering of light by dense structure, and Mie scattering of solitary NPs. These structural colors are independent of viewing angles and large mechanical strains. The dynamic physical and chemical bonding of the gelatin hydrogel network matrix enables self-healing functions and good deformability. Moreover, salt treatment of the structural-colored gelatin hydrogel networks enhances physical crosslinking and the mechanical strength of the hydrogel. The resilient, flexible and self-healable structural-colored nanocomposite hydrogel with low SiO 2 NP content has great potential in wearable photonics, cosmetics, and various other color-related fields. This work also sheds light on enhancing non-iridescent structural colors through advanced photonic design.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）