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S-scheme heterojunction/Schottky junction tandem synergistic effect promotes visible-light-driven catalytic activity

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Nano Research 2023年第2期16卷 2152-2162页

作者： Shuai Wang Xin Du Changhao Yao Yifeng Cai Huiyuan Ma Baojiang Jiang Jun Ma School of Material Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150040China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Department of Food and Environment Engineering East University of HeilongjiangHarbin 150066China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080China

Designing photocatalysts with high light utilization and efficient photogenerated carrier separation for pollutant degradation is one of the important topics for sustainable *** this study,hierarchical core–shell materialα-Fe_(2)O_(3)@ZnIn_(2)S_(4)with a step-scheme(S-scheme)heterojunction is synthesized by in situ growth technique,and MXene Ti_(3)C_(2)quantum dots(QDs)are introduced to construct a double-heterojunction tandem *** photodegradation efficiency ofα-Fe_(2)O_(3)@ZnIn_(2)S_(4)/Ti_(3)C_(2)QDs to bisphenol A is 96.1%and its reaction rate constant attained 0.02595 min^(−1),which is 12.3 times that of pureα-Fe_(2)O_(3).Meanwhile,a series of characterizations analyze the reasons for the enhanced photocatalytic activity,and the charge transport path of the S-scheme heterojunction/Schottky junction tandem is *** construction of the S-scheme heterojunction enables the photo-generated electrons ofα-Fe_(2)O_(3)and the holes of ZnIn2S4 to transfer and combine under the action of the reverse built-in electric *** to the metallic conductivity of Ti_(3)C_(2)QDs,the photogenerated electrons of ZnIn_(2)S_(4)are further transferred to Ti_(3)C_(2)QDs to form a Schottky junction,which in turn forms a double-heterojunction tandem mechanism,showing a remarkable charge separation *** work provides a new opinion for the construction of tandem double heterojunctions to degrade harmful pollutants.

关键词： α-Fe_(2)O_(3) ZnIn2S4 MXene Ti_(3)C_(2)quantum dots(QDs) step-scheme heterojunction Schottky junction bisphenol A

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Efficient flexible perovskite solar cells and modules using a stable SnO_(2)-nanocrystal isopropanol dispersion

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Nano Research 2024年第4期17卷 2704-2711页

作者： Zhiwei Su Jing Li Ruixuan Jiang Shujie Zhang Chengkai Jin Feng Ye Bingcan Ke Mengjun Zhou Jinhui Tong Hyesung Park Fuzhi Huang Yi-Bing Cheng Tongle Bu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Material Science and Engineering Wuhan University of TechnologyWuhan 430070China Department of Materials Science and Engineering Graduate School of Semiconductor Materials and Devices EngineeringGraduate School of Carbon NeutralityLow Dimensional Carbon Materials CenterUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200China

The outstanding advantages of lightweight and flexibility enable flexible perovskite solar cells(PSCs)to have great application potential in mobile energy *** to the low cost,low-temperature processibility,and high electron mobility,SnO_(2) nanocrystals have been widely employed as the electron transport layer in flexible *** prepare high-quality SnO_(2) layers,a monodispersed nanocrystal solution is normally ***,the SnO_(2) nanocrystals can easily aggregate,especially after long periods of ***,we develop a green and cost-effective strategy for the synthesis of high-quality SnO_(2) nanocrystals at low temperatures by introducing small molecules of glycerol,obtaining a stable and well-dispersed SnO_(2)-nanocrystal isopropanol dispersion *** to the enhanced dispersity and super wettability of this alcohol-based SnO_(2)-nanocrystal solution,large-area smooth and dense SnO_(2) films are easily deposited on the plastic conductive ***,this contributes to effective charge transfer and suppressed non-radiative recombination at the interface between the SnO_(2) and perovskite *** a result,a greatly enhanced power conversion efficiency(PCE)of 21.8%from 19.2%is achieved for small-area flexible PSCs.A large-area 5 cm×5 cm flexible perovskite solar mini-module with a champion PCE of 16.5%and good stability is also demonstrated via this glycerol-modified SnO_(2)-nanocrystal isopropanol dispersion approach.

关键词： tin oxide isopropanol dispersion colloid stability flexible perovskite solar cells

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Creating a bionic scaffold via light-curing liquid crystal ink to reveal the role of osteoid-like microenvironment in osteogenesis

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Bioactive materials 2024年第10期40卷 244-260页

作者： Kun Liu Lin Li Yizhi Li Yiting Luo Zhaoyu Zhang Wei Wen Shan Ding Yadong Huang Mingxian Liu Changren Zhou Binghong Luo Biomaterial Research Laboratory Department of Material Science and EngineeringCollege of Chemistry and MaterialsJinan UniversityGuangzhou510632PR China Engineering Research Center of Artificial Organs and Materials Ministry of EducationGuangzhou510632PR China Department of Cell Biology&Institute of Biomedicine College of Life Science and TechnologyGuangzhou510632PR China

Osteoid plays a crucial role in directing cell behavior and osteogenesis through its unique characteristics,including viscoelasticity and liquid crystal(LC)***,integrating osteoid-like features into 3D printing scaffolds proves to be a promising approach for personalized bone *** extensive research on viscoelasticity,the role of LC state in bone repair has been largely overlooked due to the scarcity of suitable LC ***,the intricate interplay between LC state and viscoelasticity in osteogenesis remains poorly ***,we developed innovative hydrogel scaffolds with osteoid-like LC state and viscoelasticity using digital light processing with a custom LC *** utilizing these LC scaffolds as 3D research models,we discovered that LC state mediates high protein clustering to expose accessible RGD motifs to trigger cell-protein interactions and osteogenic differentiation,while viscoelasticity operates via mechanotransduction ***,our investigation revealed a synergistic effect between LC state and viscoelasticity,amplifying cellprotein interactions and osteogenic mechanotransduction ***,the interesting mechanochromic response observed in the LC hydrogel scaffolds suggests their potential application in *** findings shed light on the mechanisms and synergistic effects of LC state and viscoelasticity in osteoid on osteogenesis,offering valuable insights for the biomimetic design of bone repair scaffolds.

关键词： 3D printing Digital light process Liquid crystal hydrogel scaffolds High protein clustering Tunable mechanotransduction Synergistic osteogenesis

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Design and Prototyping of Queuing Conveyer Belt System Based on Low-Cost Open-Source Microcontroller 10

Design and Prototyping of Queuing Conveyer Belt System Based...

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10th International Conference on Smart Computing and Communication, ICSCC 2024

作者： Abiyasa, Agus Putu Sugara Yasa, I Wayan Asna, I Made Gede Adrama, I Nyoman Riko, I Made Universitas Pendidikan Nasional Department of Electrical Engineering Denpasar Indonesia Institute of Material Research and Engineering Agency for Science Technology and Research Singapore Singapore

ISBN: (纸本)9798350363104

This study presents the design, implementation, and testing of a conveyor belt system aimed at queuing passenger luggage in airport terminals, with a focus on optimizing efficiency and passenger experience during pre-flight procedures. The system comprises three conveyors equipped with sensors and control mechanisms to automate luggage sorting and positioning. An Arduino Uno microcontroller and infrared sensors are utilized to prototype the model. Testing is conducted under various scenario conditions to assess the system's performance, including different passenger traffic volumes and environmental factors. Additionally, the system is designed to operate under normal and emergency conditions, with manual override functionality activated by an emergency button. Results demonstrate the system's ability to adapt to dynamic operational environments, enhancing operational efficiency and passenger satisfaction in airport terminals. Overall, this study contributes to the advancement of airport baggage handling technology, with potential applications for improving airport operations worldwide. © 2024 IEEE.

关键词： Microcontrollers

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Influence of deformation zone length on bending radius of SS304 tubes with small diameters manufactured via free bending-based active motion

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Chinese Journal of Aeronautics 2023年第6期36卷 420-434页

作者： Shenghan HU Cheng CHENG Ali Abd EL-ATY Shuo ZHENG Xunzhong GUO Chunmei LIU Jie TAO College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 21ll00China Department of Materials Science and Engineering&RIAM Seoul National UniversityI-Gwanak-roGwanakguSeoul 08826Republic of Korea Mechanical Engineering Department Faculty of Engineering-HelwanHelwan UniversityCairo 11795Egypt

In three and six-axis free-bending equipment,the deformation zone length(A)is a fixed mechanical structure parameter modified when the relevant structure is redesigned and *** this study,a six degree of freedom(6-DOF)parallel mechanism was used as the control mechanism of the bending die,and a new method of changing the deformation zone length(A)was ***,an idealized geometric model of free bending-based active motion was ***,the influence of the deformation zone length(A)on the bending moment and the bending radius of the tube was *** addition,the finite element simulation and a kinematic model of free bending-based active motion controlled by the 6-DOF parallel mechanism were established,and bending processes of the SS304 tube with different deformation zone lengths were ***,the impact of the deformation zone length(A)on the bending radius,bending moment,wall thickness,and motion of the parallel mechanism were ***,experiments were carried out on the free-bending equipment based on the 6-DOF parallel *** verified the rules in the theoretical analysis,finite element simulation,and kinematic simulation.

关键词： Bending radius Deformation zone length 6-DOF parallel mechanism Free bending-based active motion Small diameter tube

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Photocatalytic properties of CaTi_(2)O_(5)via a facile additive-free aqueous strategy with different pH values

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Rare Metals 2021年第7期40卷 1746-1752页

作者： Wei-Xia Dong Qi-Fu Bao X-YGu Hui-Juan Shen Peng-Yan Liu Department of Material Science and Engineering Jingdezhen Ceramic InstituteJingdezhen 333001China

CaTi_(2)O_(5)was selectively prepared by a solvothermal process without template and *** phase of the as-prepared samples was determined by X-ray diffraction(XRD).The microstructure was characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Results found that pH values had a crucial effect on the crystal phase and shape evolution of the ***_(2)O_(5)sample prepared at pH of 5.2 shows high efficient light harvesting,large surface area and ***,CaTi_(2)O_(5)shuttle-like sample shows good photocatalytic activity against methyl orange due to its longer and thinner shuttle-like morphology and high crystallinity,enhanced light harvesting and large surface *** photocatalytic rate of CaTi_(2)O_(5)shuttle-like structure reaches 0.1988 min-1 for 25-min methyl orange degradation under the ultraviolet light irradiation and displays an excellent photostability with a degradation efficiency of 0.1952 min^(-1)after four cycles.

关键词： pH CaTi_(2)O_(5) Solvothermal method Photocatalytic properties

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Efficiency Enhancement of CIGS Solar Cells with BSF Layer and Graded-Bandgap Absorber Layer 17

Efficiency Enhancement of CIGS Solar Cells with BSF Layer an...

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17th IEEE International Conference on Industrial and Information Systems, ICIIS 2023

作者： Wijesingha, J.R. Damayanthi, R.M.T. De Silva, G.I.P. University of Moratuwa Department of Electrical Engineering Sri Lanka University of Moratuwa Department of Material Science Engineering Sri Lanka

ISBN: (纸本)9798350323634

The efficiency of conventional copper indium gallium selenide (CIGS) solar cells is lower than that of silicon-based solar cells. The use of expensive materials such as indium and gallium raise the manufacturing cost. The efficiency of conventional CIGS solar cells is compared in this study by using Tin (II) sulfide (SnS) as an economical back surface field layer (BSF) and a graded bandgap absorber (CIGS) layer. In this investigation, a conventional CIGS structure comprising of Al/ZnO/CdS/CIGS/Mo was used as a reference. During the initial stage, A BSF layer was introduced to the conventional structure. It had a 28.18% efficiency using a thickness of 0.8 μ m CIGS layer and thickness of 0.3 μ m ultrathin SnS layer. The conventional structure was treated with a 1.1 μ m thick graded bandgap CIGS layer in the second stage. A structure known as a graded CIGS layer is one in which the bandgap of the material varies depending on the concentration of gallium present. The bandgap in this investigation ranged from 0.10 to 0.35 eV, yielding in a cell efficiency of 23.55%. These findings bode well for more efficient and cost-effective solar cell production. © 2023 IEEE.

关键词： Layered semiconductors

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Wear Performance of a Novel Silicon Nitride Ceramic for Biomedical Applications

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Biomedical materials and Devices 2023年第2期1卷 990-999页

作者： Correa Filho, Luimar Fu, Le Engqvist, Håkan Xia, Wei Persson, Cecilia Division of Biomedical Engineering Department of Materials Science and Engineering Uppsala University Uppsala Sweden Division of Applied Materials Science Department of Materials Science and Engineering Uppsala University Uppsala Sweden School of Material Science and Engineering Central South University Changsha China

Ceramic materials are sometimes used as bearing surfaces of joint implants due to their high wear resistance and biocompatibility. Silicon nitride (Si3N4) is one of the ceramics under investigation for such use, owing... 详细信息

Ceramic materials are sometimes used as bearing surfaces of joint implants due to their high wear resistance and biocompatibility. Silicon nitride (Si₃N₄) is one of the ceramics under investigation for such use, owing to its bacteriostatic properties and high wear resistance. Traditional Si₃N₄ is sintered using Al₂O₃ and Y₂O₃ as sintering aids. To improve the biocompatibility and bioactivity of Si₃N₄, new sintering aids (SrO, MgO, and SiO₂) were used in this work. This substitution may however have substantial effects on the wear properties of the material. Hence, the aim of this study was to evaluate these effects. Multidirectional pin-on-disc wear tests against ultra-high molecular weight polyethylene pins were used to this end, running in fetal bovine serum solution at 37 °C for 2 million cycles. The surface roughness, phase composition, and surface morphology of the surfaces were investigated, together with the pH of the wear test lubricant and compared to a traditional Si₃N₄ composition. XRD and SEM results showed that the prepared ceramics were composed of α- and β-phase Si₃N₄. The surface roughness of the Si₃N₄ ceramic discs was in accordance with the biomedical standard, and the wear test results demonstrated that the new ceramics had a low wear factor and a comparable coefficient of friction to Si₃N₄ ceramics reported in previous work. However, the dissolution of the materials over time may be a concern for biotribological applications, such as long-term use or in other wear couples. © The Author(s) 2023.

关键词： Joint replacements Silicon nitride Spark plasma sintering Wear

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Development of Novel Ternary Alloy of CSiSn for Low-Cost Next Generation Photovoltaics

Development of Novel Ternary Alloy of CSiSn for Low-Cost Nex...

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11th Symposium on SiGe, Ge, and Related Compounds: materials, Processing, and Devices - In Memory of Qizhi Liu, held at the PRiME 2024 Meeting

作者： Banihashemian, S.F. Mahmoudi, M. Mosleh, A. Naseem, H.A. Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States Material Science & Engineering Program University of Arkansas FayettevilleAR72701 United States

ISBN: (纸本)9781623326630

The growing need for highly efficient solar cells calls for significant advancements in the development of a new material system to meet the needs of low-cost production. Current multi-junction solar cell alternatives are more costly to produce. This research showcases the development and analysis of a novel ternary material system, The CSiSn (CST) alloy, which shows potential for creating low-cost material with high absorption across solar spectrum. In this work, the following aspects regarding the CST material are investigated: 1) material modelling using density functional theory, 2) electronic band structure estimations, 3) low-temperature material growth technique via Plasma Enhanced Chemical Vapor Deposition (PECVD) system;4) advanced material and optical characterizations of CST alloys. Copyright © 2024 by The Electrochemical Society. All rights reserved.

关键词： Ternary alloys

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DEGRADATION OF ORGANIC POLLUTANTS IN FLOCCULATED LIQUID DIGESTATE USING PHOTOCATALYTIC TITANATE NANOFIBERS: MECHANISM AND RESPONSE SURFACE OPTIMIZATION

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Frontiers of Agricultural science and engineering 2023年第3期10卷 492-502页

作者： Yiting XIAO Yang TIAN Yuanhang ZHAN Jun ZHU Department of Biological and Agricultural Engineering University of ArkansasFayettevilleAR 72701USA Material Science and Engineering Programs University of ArkansasFayettevilleAR 72701USA

Titanate nanofibers(TNFs)were synthesized using a hydrothermal method and were employed for the first time in this study to photocatalytically degrade organic pollutants found in flocculated liquid digestate of poultry *** photocatalytic performance of TNFs,with a bandgap of 3.16 eV,was tested based on degradation of organic pollutants and removal of *** combinations of pollutant concentration and pH were examined(0.2 to 1.3 g·L^(−1) at pH 4 to 10).Central composite design(CCD)and response surface methodology(RSM)were applied in order to optimize the removal rates of volatile fatty acids(VFA)and chemical oxygen demand(COD),and the decolorization *** were no significant differences between the regression models generated by the CCD/RSM and the experimental *** was found that the optimal values for pH,dosage,VFA removal rate,COD removal rate and decolorization rate were 6.752,0.767 g·L^(−1),72.9%,59.1%and 66.8%,*** findings indicates that photocatalytic TNFs have potential for the posttreatment of anaerobic digestion effluent,as well as other types of wastewater.

关键词： titanate nanofibers photocatalysis poultry litter liquid digestate

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