APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Meng Fu,Xiangming Li,Zepeng Zhang
Here we demonstrate a novel magnetic functional material composed of montmorillonite (Mt) with superparamagnetic coating Fe 3 O 4 dispersed in the aqueous solution. Colloidal stability can be obtained through keeping 2 < pH < 3. After applying an external magnetic field, Mt@Fe 3 O 4 exhibits long-range order and liquid crystalline phase. The transmittance of the liquid crystal is dependent on the solid content of Mt@Fe 3 O 4 , magnetic field strength and magnetic field direction. We also observe reflective phenomena when we modulate the magnetic field. The photonic bandgap can be tuned by changing the angle between incident light and magnetic field. The varying observation points also make a difference to the reflection. This facile approach for fabricating Mt@Fe 3 O 4 with ordered periodic structures and optically tunable property is of interest for a variety of advanced optics applications with low cost and environment-friendly.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Fiber Materials
·
2022
·Vol. 4
·期 5
·1209-1218
·
IF 12.958
Guo Jiahui,Zhang Han,Zhang Hui,Chen Hanxu,Gu Zhuxiao,Zhang Dagan,Zhao Yuanjin
Tactile sensors with distinctive ability to imitate skins have attracted considerable attention from researches for applications in a variety of sensing fields. Here, inspired by the tentacles of jellyfish, biomimetic hydrogel microfibers were fabricated to be implanted with discrete structural color microsphere units for spatial tactile sensing. By employing a microfluidic spinning technology, the generated microfibers were with high microsphere encapsulation features and controllable morphologies because of the density match of microspheres and the pre-hydrogel solution. In addition, benefitting from the easy manipulation of the microfluidics, microfibers implanted with different structural color microspheres could also be realized. It was demonstrated that the resultant microfibers would show synchronous shifts of photonic bandgaps as well as structural color when a local force like pressure or tension was applied to the microsphere part. Based on the localization of finger bending experiments, the practical values of the bioinspired microfibers have also been proved as spatial tactile sensors. Thus, it is believed that the proposed bioinspired hydrogel microfibers are greatly significant in diverse sensing application fields. Graphical Abstract
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Wenjie Yang,Chenglin Zheng,Jinghui Li,Yuchen Yue,Xiuhong Li,Lei Shi,Jingxia Wang,Lei Jiang
Blue-phase liquid crystals (BPLCs) possess unique 3D periodic chiral structures and extraordinary optical manipulation capabilities, demonstrating considerable potential in flexible displays, high-security encryption, and intelligent sensors. Despite lattice deformations of BPLCs widely exist in various applications, there remains a challenge to understanding the quantitative relationship between different deformation modes and resulting 3D diffractive optics. Herein, a universal simulation strategy is proposed based on spatial geometry modeling to enable real-time computation of dynamic optical responses in BPLCs. This framework systematically interprets and predicts the optical characteristics under both symmetric lattice deformations (governed by chiral dopant concentration) and asymmetric lattice deformations (induced by phase separation or component dispersion). Differentiated nonlinear optical effects are revealed for these deformations in Kossel diffraction analysis. Furthermore, anisotropic modulation of surface/sectional structural colors (photonic bandgaps) and angle-dependent control over the full spatial light field is demonstrated by tailoring interplanar spacing and facet orientation within the lattice symmetry constraints. This study establishes a theoretical foundation for designing next-generation BPLC-based photonic devices, including holographic displays, all-optical switches, integrated waveguides, and 3D lasing systems.
研究领域:
材料科学
·
光学工程
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Hongbo Zhao,Ling-Yan Xu,Xing-Yu Zhang,Renjun Pei,Pei-Xi Wang
The efficient generation of circularly polarized light (CPL) is crucial in information technologies such as optical communications and three-dimensional displays. In nature, many plants and animals can transform unpolarized light into CPL with chiral helical superstructures, which has inspired the development of CPL-related materials and devices. Herein, by combining the self-assembled chiral nematic liquid crystalline microstructures of cellulose nanocrystals with geometrical configurations of Fresnel lenses, free-standing solid-state cellulosic converging lenses with large sizes, circular polarization features, and adjustable chiral photonic bandgaps were fabricated at low cost, which could produce CPL beams exhibiting dissymmetry factors (g = 2(IL – IR)/(IL+ IR)) up to −0.61 ± 0.02 by focusing sunlight and generate real images of distant objects. These results may help guide the development of polarized light sources or imaging systems, and also suggest a simple method to construct multifunctional optical devices from photonic crystals.
研究领域:
光学材料
·
纳米技术
·
生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Yuxian Zhang,Maohua Quan,Weidong Zhao,Zhou Yang,Dong Wang,Hui Cao,Wanli He
The research about assembly behavior of colloidal particles under external field is a key of improved self-assembly method. Although high quality photonic crystals prepared by improved self-assembly method under external field have been reported, real applications require monodisperse particles. Here, we designed negative pressure field to prepare opal film composed of polydisperse SiO 2 particles. The effect of different negative pressures on the opal’s surface morphology and photonic band gap (PBG) properties was investigated. Under the optimal pressure, close-packed opal was obtained, which is composed of irregular and polydisperse silica particles. We attribute this to the balance between sedimentation of SiO 2 particles and solvent evaporation during the assembly process. Importantly, this approach could be complementary to the preparing of three-dimensional photonic crystals with long-range ordered structures in usual laboratory.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Kai Yu,Chenxi Zhang,Yue Chang,Yajun Feng,Zequn Yang,Ting Yang,Lan-Lan Lou,Shuangxi Liu
Three-dimensionally ordered macroporous SrTiO 3 (3DOM-SrTiO 3 ) materials with different pore sizes were originally prepared and employed as photocatalysts in the water splitting for hydrogen generation. These 3DOM-SrTiO 3 photocatalysts were characterized by XRD, SEM, TEM, EDS, DR UV–vis and N 2 sorption . Because of the slow photon effect of 3DOM-SrTiO 3 , notably enhanced efficiency of water splitting for hydrogen evolution was obtained compared with the solid-state SrTiO 3 (SS-SrTiO 3 ) and disordered porous SrTiO 3 (Disorder-SrTiO 3 ). The effect of stop-band on the efficiency of photocatalytic hydrogen production was studied by tuning the pore diameter of 3DOM-SrTiO 3 . It was found that higher hydrogen evolution efficiency could be achieved when the photonic stop-band of 3DOM-SrTiO 3 was overlapped with its band gap, which was further confirmed by the control experiments under certain wavelength light irradiation. 3DOM-SrTiO 3 (270 nm) exhibited the highest photocatalytic hydrogen evolution rate (up to 3599 μmol/g·h), which was 31 times as high as that of SS-SrTiO 3 and 11 times higher than that of Disorder-SrTiO 3 . Furthermore, these 3DOM-SrTiO 3 catalysts were very stable and no obvious loss in photocatalytic efficiency of hydrogen production was observed after five cycles.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yang Hu,Dongpeng Yang,Dekun Ma,Shaoming Huang
Mechanochromic photonic crystals (MPCs) that can change their colors under pressures are highly desired. However, the poor sensitivity of MPCs (including the limited tuning range of photonic bandgap and responsive speed) and stability restrict their practical applications. Here, extremely sensitive MPCs film with outstanding optical performances was fabricated through the self-assembly of the silica particles into di(ethylene glycol) ethyl ether acrylate (DEGEEA) and fixing the ordered structures by photopolymerization. The strong electrostatic repulsion between the particles was experimentally proved to be the key for the self-assembly of silica particles in nonpolar DEGEEA, ruling out the solvation force as the driving force. Compared with the conventional MPCs, the as-fabricated MPCs exhibit significant improvements in optical performances, including broad tuning range of photonic bandgap (362 nm), high sensitivity (7.55 nm/kPa), fast responsive speed (7.0 nm/ms), long-lasting usability (>2 months), wide working temperature range (−20 to100 ℃) and excellent reversibility (>1000 times) in cycling test. Based on these characteristics, the MPCs can be used for display applications with high-resolution (up to 5.0-µm resolution) and full colors. This work provides new insight for the self-assembly of colloids and will extend the applications of MPCs in sensitive sensors, multicolor displays, and smart windows.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 17
·期 6
·2200834
·
IF 11
Yanqiong Wang,Chaoyang Gong,Xi Yang,Tao Zhu,Ke Zhang,Yun-Jiang Rao,Lei Wei,Yuan Gong
Lasers are emerging as novel photonic tags for single-cell labeling, anticounterfeiting, and encryption technology due to their narrow linewidth, high spectral multiplexing capacity, and superior stimuli-responsiveness. These laser-encoded photonic tags mostly distinguish the heterogeneity but do not yet provide both tagging and sensing of biosamples, which is highly desirable for disease screening. Here, a photonic bandgap (PBG) fiber microlaser that works as a 2D tag and an immunosensor is developed. The tubular PBG structure allows strong light–matter interaction and supports dual-band lasing in the same optical fiber, enabling massive biosample tagging and sensitive biodetection. By encoding the random resonant peaks in the short-wave band and multiplexing in the spatial domain, a 2D laser tag is generated with a large encoding capacity (>2 8500 ). Immunosensing of microalbumin is realized by using the periodic resonant peaks in the long-wave band, and a limit of detection of 0.06 ng µL −1 is achieved. This work is inspiring for the development of high-performance, multifunctional integrated devices for disease screening.
研究领域:
生物医学工程
·
光学工程
·
传感器技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaoyu Zhai,Yujie Chen,Yunqian Ma,Yanchao Liu,Jiaxiang Liu
Indium tin oxide (ITO), a representative transparent conducting oxide (TCO), is widely applied in photoelectric devices. In this work, monodisperse ITO submicro-spheres have been prepared using one-step solvothermal method at 250 °C. l -Histidine (L-His), triethylamine (TEA) and dimethylformamide (DMF) were used as shape controller, base agent and solvent, respectively. Significantly, the effect from process variables on the size and shape of submicro-spheres was studied systematically. L-His was used to promote the formation of spherical morphologies. When reaction time was prolonged from 12 to 24 h, nano-size particles eventually grew into submicron particles. After adding L-His, the size of ITO particles became smaller and the crystal tended to sphere-shape from cubic-shape. Meaningfully, the effect from particle size and morphology plays a key role in the resistivity of resultant powders. Compared with the resistivity of larger particles with mixed morphology prepared without L-His, the one of well-crystallized sphere-shaped small particles prepared with L-His was lower. The range of resistivity was between 0.4 and 0.7 Ω cm when 0.05 M L-His was added. Moreover, uniform spheres with a diameter of 0.29 μm have been obtained by one-step solvothermal method with 1 M TEA and 0.05 M L-His, which have potential application in photonic band gap crystals.
研究领域:
材料科学
·
光电设备
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Minglu Zhang,Qi Yuan,Yanyan Guo,Saijin Song,Dongyu Wang,Junli Zhang,Hao-Yang Mi,Jian Han,Chuntai Liu,Changyu Shen
Planar 1D photonic crystals (1DPhCs), owing to their photonic bandgaps (PBGs) formed by unique structural interference, are widely utilized in light protection applications. Multifunctional coatings that integrate various light management functions are highly desired. In this study, we present the fabrication of dual-PBG 1DPhCs with high reflectance in both the blue and near-infrared (NIR) regions. The 1DPhCs were constructed through the alternating stacking of hollow SiO2 (HS) nanoparticles hybridized with poly(vinyl alcohol) (PVA), referred to as PHS, and TiO2 layers. The 1DPhC with 7 bilayers demonstrated remarkable reflectance of 98.2% and 93.4% in the blue and NIR spectra, respectively, with shielding efficiencies of 93.9% and 85.6%. Compared to bare PC, the temperature was observed to be 10.6 °C lower, achieving a thermal insulation efficiency of 44.8% in the 900 nm near-infrared range. Additionally, spectral fitting using the transfer matrix method (TMM) and optimization of process parameters, including PHS concentration and spin-coating speed, enabled the fabrication of 1DPhCs with tunable optical thickness ratios. The fabricated films demonstrated a smooth surface morphology with flat and uniform interfaces, as well as excellent environmental stability. These features make the 1DPhCs highly promising for applications in light protection and thermal management. This study provides a novel approach for the development of dual-PBG 1DPhCs with enhanced protective capabilities.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tang Qiyue,Xia Hongbo,Wu Zikang,Liu Rongjie,Qi Wenlin,He Wentao,Yang Yuqin
Cesium lead halide perovskite nanocrystals (CsPbX 3 NCs) doped with Mn 2+ brings attractive long-wavelength emission and flexible color tunability. However, modulating the exciton-to-Mn 2+ energy transfer efficiency poses a challenge, particularly when relying on traditional methods such as changing halogen composition or incorporating external cations, which often complicate the process. In this work, a simple photonic bandgap (PBG)-modulation strategy is applied to modulate the exciton-to-Mn 2+ energy transfer by constructing a sandwich “PC-Perovskite-PC” structure with two photonic crystal (PC) films and Mn 2+ doped CsPb(ClBr) 3 NPs. When the PBG and the host emission band change from deviation to coincidence, the lifetime of Mn 2+ decreases from 0.54 ms to 0.36 ms owing to the enhancing energy transfer efficiency by PBG effect. Meanwhile, the ratios of orange and blue emissions (O/B) increase from 1.36 to 1.6. In addition, the back energy transfer also can be modulated. When the PBG matches well with the Mn 2+ emission band, the lifetime of the host emission exhibits the largest value (1.25 ns) owing to back energy transfer from Mn 2+ the host. Meanwhile, the O/B value shows the smallest value (0.52) attributed to the decreased spontaneous radiation of Mn 2+ and the enhanced host emission. When PBG deviates from the Mn 2+ emission band, the lifetime of the host emission decreases but O/B value increases gradually. This work provides new strategy for the modulation of energy transfer in Mn 2+ doped CsPb(ClBr) 3 NPs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Chem
·
2024
·
IF 19.1
Shuqi Wang,Hao Chen,Tianyu Zhong,Quanzheng Deng,Shaobo Yang,Yuanyuan Cao,Yongsheng Li,Lu Han
Gyroid (G) surfaces, the most famous naturally occurring triply periodic hyperbolic surfaces, are well known for their amazing properties closely associated with their intriguing symmetries. Although mathematicians and physicists are devoted to exploring new G surface family members, it remains a mystery whether any novel symmetrical G substructure can be experimentally validated beyond its well-known cubic-symmetrical systems. Herein, we report a tetragonal G substructure (shifted tG) obtained from a cooperative binary self-assembly system consisting of polystyrene- b -poly(acrylic acid) and cetyltrimethylammonium bromide. Shifted tG features periodic distributions of uneven matrix thicknesses with local concave free energies, exhibits an extraordinarily shifted double-gyroidal network with a low-symmetry space group of I 4 1 / a (no. 88), and possesses shifting-degree-dependent photonic band gaps that are never present in its unshifted cubic-symmetrical counterparts. The emergence of new G structures demonstrates a new frontier in the minimal surface subject, crucial for its exploration and innovation.
研究领域:
材料科学
·
表面科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）