RSC Advances
·
2018
·Vol. 8
·期 11
·6047-6052
·
IF 2.936
Yutong Wang,Yifei Zhang,Mengfan Wang,Yanan Zhao,Wei Qi,Rongxin Su,Zhimin He
In this study, a light-responsive multienzyme complex (GOx&hemin@PepM) was developed by incorporating glucose oxidase (GOx) and hemin within a peptide-based matrix. An azobenzene group (Azo) was linked to the N-terminucs of glycine-phenylalanine-glycine tripeptide (GFG) to facilitate the formation of the supramolecular peptide-based matrix. Due to the proximity effect of GOx and hemin in the matrix as well as the biomimetic microenvironment of the peptide-based material, the transfer of intermediates can be enhanced and the catalytic activity of this multienzyme complex was greatly improved over free enzymes for catalyzing a cascade reaction. In addition, based on the light-responsive conformational switching of azobenzene between E and Z forms, the structure of the peptide-based matrix can be modulated, by which the catalytic activity of the multienzyme complex can be further controlled using UV and visible light. This study provides a new approach for constructing a stimuli-responsive multienzyme complex based on an adjustable material platform.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jingtian Kang,Cunping Bai,Suixin Liu,Yinggang Jia
Carbon nanotubes (CNT) can enhance the mechanical and light absorption properties of the liquid crystal elastomer (LCE). Different from other ring-shaped LCE works, we proposed a ring-shaped structure using LCE-CNT composite materials that can achieve nontethered rolling with the assistance of its own gravity controlled by light. We demonstrate that the LCE-CNT composite material can lift nearly 200 times its own weight induced by light, and a cantilever beam made from it exhibits remarkable deformations to overcome gravity. Subject to light radiation, the LCE-CNT ring effectively converts light energy into mechanical energy, enabling nontethered rolling on flat surfaces, titled surfaces, and over small obstacles. Moreover, using the finite element method, we analyze the rolling mechanism of the ring induced by light and investigate the effects of light angle on the inhomogeneous deformation of the ring, the shift of the gravity center, and the generated rolling moment. The results and methods in this paper can help to give a reference for the design and analysis of intelligent soft machines.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Piaoyang Shen,Xuanyu Zhang,Ruifa Wu,Ting Zhang,Lei Qian,Wei Xu,Kai Kang,Dewei Zhao,Chaoyu Xiang
Inverted perovskite light-emitting diodes (PeLEDs) based on quantum dots (QDs) are some of the most promising candidates for next-generation lighting and display applications. Due to the strong fluorescence quenching caused by zinc oxide, high performance in such inverted devices remains challenging. Here, we report an efficient inverted green CsPbBr3 QDs LED using an emitting buffer layer. Ultrathin CsPbBr3 QD emitters act as the buffer layer to reduce the interface luminescence quenching reaction at the ZnO/upper emitting layer interface, increasing the probability of exciton recombination within the emissive layer and regulating the charge transport, leading to effective carrier recombination. The resulting device exhibits an external quantum efficiency of 13.1%, enhanced by about 4.7 times compared with that without a buffer layer device. This work provides a path to fabricating high-performance inverted PeLEDs.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 2
·950-955
·
IF 1.093
Yan Shancheng,Shen Yu,Wang Ka,Song Haizeng,Wang Jun
Semiconducting metal sulfides have raised strong research interest among researchers as a promising candidate for light-assisted electrochemical water splitting, because they have wide band gap. In order to harvest more light wavelengths for improvement of light-assisted electrochemical
water splitting capacity, we fabricated SnS2/SnS heterojunction nanosheets via facile and environmental route. The SnS2/SnS heterojunction nanosheets were used as photo-electrocatalytic material which exhibited low over potential of −0.64 V at the current density
of 10 mA·cm−2 in 0.5 M NaSO4 solution. Moreover, the SnS and SnS2 nanosheets displayed high over potential values of −0.80 and −0.88 V at the current density of 10 mA·cm−2, respectively. This research finding
may therefore show the potential for use of SnS2/SnS heterojunction nanosheets as low cost and environmentally friendly photo-electrocatalysis.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 20
·
IF 1.64
Lei Wang,Yandong Li,Jingfen Sun,Yan Lu,Yujiao Sun,Dandan Cheng,Chenxi Li
Because of its interaction with diverse proteins, heparin plays an important role in the regulation of various normal physiological and pathological processes. However, heparin overdose can induce some complications such as hemorrhages and thrombocytopenia. Therefore, it is critical to detect and quantify heparin accurately and quickly. Recently, conjugated polyelectrolytes (CPEs)-based fluorescent probes for heparin sensing have attracted considerable interests. Unfortunately, only few kinds of CPEs such as polyfluorenes derivatives, polythiophene derivatives, are reported and effective in fluorescent assays of heparin by now. This contribution aims to develop a new kind of polyelectrolytes based on poly(pyridinium salt)s derivatives for heparin detection with a light-up signature. An alternative conjugated poly(pyridinium salt)s ( P1 ) containing carbazole segments in the main chain was designed and synthesized, which are weakly emissive in solution but highly luminescent upon binding with heparin. Fluorescence light-up probes for heparin detection based on P1 were developed with high selectivity. P1 shows the similar fluorescence response toward heparin both in a broad pH range of about 3–12 and in the presence of various competing anions. Heparin quantification with a practical calibration range (0–14 µ M ) covering the whole therapeutic dosing levels (0.2–1.2 U mL −1 , 1.7–10 µ M ) is realized based on the polymer probe. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40933.
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CULTURAL ANTHROPOLOGY
·
2011
·Vol. 26
·期 2
·263-286
·
IF 3.146
FILIP DE BOECK
This article addresses the tensions that exist between the lives of city dwellers in Kinshasa, the capital of the Democratic Republic of Congo, and those official attempts currently being launched by the Congolese government to create a new, albeit exclusionist, urban environment. During the campaign leading up to the 2006 presidential elections, President Kabila launched his “Cinq Chantiers” program, arguably the most ambitious project since the end of colonization in 1960 to overhaul the country and respond to its most pressing and urgent needs—or at least that of its elites—with regard to its urbanization. The article first situates the main phases of Kinshasa's expansion from the colonial era to the present day. It then turns to an analysis of the impact of the “Cinq Chantiers” program by examining two concrete cases: the expansion of fields in the Malebo Pool (looking at current modes of “informal” expansion of the urban space) and the development of a new urban project, the Cité du Fleuve (whose progressive uplift leaves out a large swath of the population). Are these examples of an African futurity, and for whom do they envision a new kind of urban life?
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Matter
·
2025
·
IF 17.5
Chen Yang,Baoyi Wu,Huijie Wang,Qian Zhao,Di Chen
Shape-shifting materials are bases of soft machines to accomplish sophisticated tasks. While significant progress has been made in diversifying shape transformation behaviors, current evolution pathways are determined by pre-programming approaches, limiting real-time adaptability and flexibility during operation. Here, we report a dynamic covalent polymer network swollen with a nonvolatile aliphatic acid mixture, which enables multi-shape memory properties. During shape-shifting, ultraviolet light is employed to spatially lock the geometries through disulfide bond exchange, allowing the on-demand adjustment of shape evolution. Additionally, the introduction of a photothermal azobenzene derivative allows the gel to undergo sequential shape recovery upon near-infrared light irradiation. This design facilitates real-time control of shape evolution through orthogonal light, overcoming the constraints of pre-programming. Building on this, the polymer is employed as a functional switch with an error-correction capability to enhance electrical safety. The versatility and adaptability of our strategy exhibit great potentials to fabricate future shape-shifting devices.
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产品关联
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Liu Ming,Ehsan Ghasali,Ye Cheng,Congya Zhu,Junsheng Ye,Pengfei Zhang,Saleem Raza,Asif Hayat,Yasin Orooji
High entropy oxide (HEO) has shown great potential in the field of new photocatalytic materials due to its tunable composition and excellent thermal stability. In this paper, a high entropy rare earth oxide Er 2 Tm 2 Yb 2 Lu 2 Ho 2 O 15 composed of pure rare earth elements was synthesized by solid phase reaction method (SRM). Its structural and optical properties were investigated by various characterization techniques such as XRD, TEM, SEM and UV-DRS. The results showed that the material elements were uniformly distributed, with a wide light absorption range and abundant defects. To study the photocatalytic properties of the samples, Congo Red (CR) dye was degraded under visible light irradiation. The results show that the Er 2 Tm 2 Yb 2 Lu 2 Ho 2 O 15 high entropy material has excellent photocatalytic activity, showing a degradation rate of 99.2% to 20 mg/L Congo Red (CR) under visible light, showing remarkable stability in the cycle experiment, showing its potential to degrade organic pollutants. At the same time, free radical scavenging experiments and degradation mechanisms are also discussed. This work has reference value for the study of rare earth-based high entropy oxides.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yue Yang,Rong Tang,Yuqi Lei,Di Gao,Houteng Zhao,Samra Jabeen,Yufeng Du,Ya Yang,Chenyi Wang,Xinyue Zhang,Ruijin Yu,Xianchao Du
To realize full-spectrum illumination systems for daily applications, the development of cyan-emitting phosphors capable of addressing the spectral deficiency in the 480-520 nm region (between blue and green emissions) has emerged as a critical research frontier in solid-state lighting technology. In this investigation, a scandium silicate phosphor, KSr 6 ScSi 4 O 16 :Eu 2+ , was initially synthesized via a high-temperature solid-state reaction under a reducing atmosphere. The target compounds crystallize in an orthorhombic system with a centrosymmetric space group of Pnma (No. 62). KSr 6 ScSi 4 O 16 :2 mol%Eu 2+ shows asymmetric broadband mainly at 481 nm under excitation of 359 nm. Based on Gaussian fitting and Van Uitert's equation, the Eu 2+ ion was confirmed to occupy two different coordination environments of Sr 2+ , producing two different luminescent centers at 477 nm and 528 nm. The optimal doping concentration of KSr 6 ScSi 4 O 16 : x Eu 2+ cyan phosphors was founded to be 2 mol%. Within the temperature range of 300 to 480 K, CIE coordinates remain stable during the heating process, and an activation energy of 0.35 eV has been determined. The color rendering index ( R a ) of the full spectrum WLED produced by KSr 6 ScSi 4 O 16 :Eu 2+ , reached 92.5, which is higher than the WLED packaged with commercial powder, effectively supplementing the cyan light component and closer to the full-spectrum lighting LEDs.
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OPTICAL ENGINEERING
·
2025
·
IF 1.2
Xianzhen Huang,Yun Ye,Jiaqi Gao,Xingke Zheng
Color conversion layers are extensively utilized in flat panel display technology for their capacity to provide a wide color gamut and improved resolution, along with exceptional design flexibility. The uniformity and thickness of cadmium selenide (CdSe) quantum dot (QD) films are often difficult to control in the preparation of color conversion layers. Interestingly, it is possible to precisely deposit QDs by inkjet printing to improve material utilization. Color conversion layers with optimized spectral properties and light conversion efficiency are successfully prepared by inkjet printing. We employ inkjet printing technology to fabricate CdSe QD color conversion layers with precise control over layer thickness. The effects of layer thickness on spectral properties and light conversion efficiency are systematically investigated. It is found that a layer thickness of 5.5 μm achieves the highest light conversion efficiency at 20.4%, with efficiency decreasing as thickness increases to 6 μm. In addition, it is observed that blue light transmittance decreases from 47.2% to 11.4% with increasing layer thickness, highlighting the importance of thickness control in optimizing spectral properties.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 18
·6606-6614
·
IF 5.7
Muhammad,Zengce Liu,Junchun Li,Yuanyuan Sheng,Yajing Chang,Ping Chen,Yang Jiang
Lead-free halide perovskites have been developed and have received increasing attention in optoelectronic applications due to their non-toxicity. However, single perovskite phosphors that emit vibrant, tunable-color-temperature white-light are rare. Herein, we used the anti-solvent precipitation method to develop white light-emitting diodes (WLEDs) based on rare-earth-based Sb3+ and Mn2+ co-doped Cs2KYCl6 microcrystals (MCs). The Cs2KYCl6 MCs exhibit tunable dual emissions covering a wideband ascribed to the emission of self-trapped excitons (STEs) from Sb3+ and the 4T1 to 6A1d–d transition of Mn2+. The optimal photoluminescence quantum yield (PLQY) of doped Cs2KYCl6 is 65.78%. The energy transfer process from Sb3+ to Mn2+ is revealed. WLEDs have been successfully constructed by combining the dual emissions from STEs of Sb3+ and the d–d transition of Mn2+. These WLEDs demonstrate impressive optical performance, including CIE chromaticity coordinates (0.3483, 0.4125) and a color rendering index (CRI) of 85.4. This work provides an effective strategy for developing WLEDs based on a single-component material, lead-free perovskites.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jie Zeng,Lei Xie,Tianyi Liu,Yanjun He,Weiyan Liu,Qing Zhang,Junyan Li,Xiaofeng Li,Beilei Qiu,Shan Zhou,Qirui Liang,Xudong Wang,Kang Liang,Jinyao Tang,Jian Liu,Lei Jiang,Gang Huang,Biao Kong
In the field of sustainable chemistry, it is still a significant challenge to realize efficient light-powered space-confined catalysis and propulsion due to the limited solar absorption efficiency and the low mass and heat transfer efficiency. Here, novel semiconductor TiO2 nanorockets with asymmetric, hollow, mesoporous, and double-layer structures are successfully constructed through a facile interfacial superassembly strategy. The high concentration of defects and unique topological features improve light scattering and reduce the distance for charge migration and directed charge separation, resulting in enhanced light harvesting in the confined nanospace and resulting in enhanced catalysis and self-propulsion. The movement velocity of double-layered nanorockets can reach up to 10.5 μm s–1 under visible light, which is approximately 57 and 119% higher than that of asymmetric single-layered TiO2 and isotropic hollow TiO2 nanospheres, respectively. In addition, the double-layered nanorockets improve the degradation rate of the common pollutant methylene blue under sustainable visible light with a 247% rise of first-order rate constant compared to isotropic hollow TiO2 nanospheres. Furthermore, FEA simulations reveal and confirm the double-layered confined-space enhanced catalysis and self-propulsion mechanism.
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