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Recent advances in flexible self-oscillating actuators

escience 2024年第5期4卷 91-109页

作者： Jingjing Li Wenjin Guo Weiqiang Zhao Yutian Zhu Jie Bai Zhigang Xia Xiang Zhou Zunfeng Liu School of Textile Science and Engineering State Key Laboratory of New Textile Materials and Advanced Processing TechnologiesWuhan Textile UniversityWuhan 430200China State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Functional Polymer MaterialsTianjin Key Laboratory of Functional Polymer MaterialsSmart Sensing Interdisciplinary Science CenterCollege of ChemistryNankai UniversityTianjin 300350China College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationKey Laboratory of Organosilicon Material TechnologyHangzhou Normal UniversityHangzhou 311121China College of Chemistry and Chemical Engineering Inner Mongolia Univ TechnolChem Engn CollHohhot 010051China Department of Science China Pharmaceutical UniversityNanjing 211198China

Soft actuators are constituted by a type of intelligent materials,and they can generate reversible mechanical motions under external *** usually achieve continuous actuation by manual turning on or off the power supply,which significantly increases the operation *** contrast,self-oscillating actuators can achieve autonomous motions under constant stimuli,and have recently attained great advancements,as well as promoted the development of autonomous soft *** this review,the latest achievements of soft oscillators are ***,the self-oscillating mechanisms mainly including oscillating chemical reactions and self-shadowing-induced mechanical negative feedback loops are *** oscillators constructed with various materials and configurations,driven by different stimuli and applied in different fields are then presented in ***,the difficulties and hopes of oscillators are ***,self-oscillating actuators are in the stage of vigorous development,and we believe that in the future,they will be used in various fields and make many scenarios more intelligent and autonomous.

关键词： Oscillating actuator Artificial muscles Polymer composite Biomimetic Smart materials

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Influence of anionic surfactant (SDS) on the structural properties of chromium oxide (Cr2O3) nanoparticles

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materials Today: Proceedings 2022年 69卷 193-198页

作者： Singh, Jarnail Dotiyal, Mayank Bhardwaj, Pankaj Kumar, Kaushal Bhandari, Prabhakar Verma, Vikram School of Engineering & Technology K R Mangalam University Gurguram 122103 India Department of Material Science and Engineering NIT Hamirpur Hamirpur 177005 India

The co-precipitation technique was used to synthesize the surfactant-assisted chromium (III) oxide (Cr2O3) nanoparticles. During the synthesization process, the surfactant sodium dodecyl sulfate (SDS, anionic surfactant) was incorporated. Besides, the surfactant concentration varied from 2 % to 10 % w/w with a step size of 2 %. X-ray diffraction (XRD), Field emission-scanning electron microscope (FESEM), Fourier transform-infrared spectroscopy (FTIR), and Micro-Raman spectroscopy were used to investigate the structural properties of as-prepared nanoparticles. The crystal structure of the as-prepared nanoparticles was confirmed as rhombohedral with space group R-3c by the XRD pattern, FTIR, and Raman spectra. The crystal structure of Cr2O3 nanoparticles remains unaffected with SDS incorporation at various concentrations. However, the crystallite size of synthesized nanoparticles was found to be reduced as the surfactant concentration increased up to a critical concentration value, as determined using the Scherrer equation. The minimum crystallite size of 24.05 nm was obtained at a 6 % w/w SDS concentration. The introduction of lattice strain in the nanoparticles was attributed to the shifting of the XRD peaks, which was evaluated using the Williamson-Hall equation. The intrinsic strain was increased with SDS concentration due to the decrease in average crystallite size. Morphology of pristine and SDS-aided Cr2O3 nanoparticles was found to be nearly spherical in shape. © 2022

关键词： Scanning electron microscopy

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Interfacial reaction between AZ91D magnesium alloy melt and mild steel under high temperature

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China Foundry 2024年第2期21卷 159-167页

作者： Jia-hong Dai Jian-yue Zhang Bin Jiang Xiang-jun Xu Zhong-tao Jiang Hong-mei Xie Qing-shan Yang Guo-qing Zhang College of Materials Science and Engineering Yangtze Normal UniversityChongqing 408100China National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Chongqing Jiulongyuan High-tech Industry Group Co. Ltd.Chongqing 400080China Loncin Industry Co. Ltd.Chongqing 400080China Department of Materials Science and Engineering The Ohio State UniversityColumbusOH 43210USA Chongqing Key Laboratory of Materials Surface&Interface Science Chongqing University of Arts and SciencesChongqing 402160China School of Metallurgy and Material Engineering Chongqing University of Science and TechnologyChongqing 401331China

The metallurgical quality control of magnesium(Mg)and Mg alloys in melting process is required to ensure a satisfied mechanical and corrosion performance,while the typical used steel crucible introduces impurities and interfacial interaction during melting ***,a systematic study about impurities diffusion and interfacial interaction between molten Mg and steel is *** the present study,the interfacial reaction between molten AZ91D Mg alloy and mild steel during melting process was investigated with the melting temperatures of 700℃,750℃ and 800℃.The results show that Al(Fe,Mn)intermetallic layer is the intermetallic primarily formed at the interfaces of AZ91D melt and mild ***,Al_(8)(Mn,Fe)5is indexed between Al(Fe,Mn)and ***_(3)C appears between the mild steel and Al(Fe,Mn)at 700℃ and 750℃,but absent at 800℃ due to the increased solubility of carbon in Mg *** is found that the growth of the intermetallic layer is controlled by diffusion mechanism,and Al and Mn are the dominant diffusing species in the whole interfacial reaction *** measuring the thickness of different layers,the growth constant was *** increases from 1.89(±0.03)×10^(-12)m^(2)·s^(-1)at 700℃ to 3.05(±0.05)×10^(-12)m^(2)·s^(-1)at 750℃,and 5.18(±0.05)×10^(-12)m^(2)·s^(-1)at 800℃.Meanwhile,the content of Fe is linearly increased in AZ91D with the increase of holding time at 700℃ and 750℃,while it shows a significantly increment after holding for 8 h at 800℃,indicating holding temperature is more crucial to determine the Fe content of AZ91D than holding time.

关键词： AZ91D mild steel interface reaction intermetallic growth kinetics

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Flexibility analysis for continuous ibuprofen manufacturing processes

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Chinese Journal of Chemical engineering 2022年第11期51卷 115-125页

作者： Wenhui Yang Haoyu Yin Zhihong Yuan Bingzhen Chen State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China School of Material Science and Engineering Tsinghua UniversityBeijing 100084China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

Continuous ibuprofen(a widespread used analgesic drug)manufacturing is full of superiorities and is a fertile field both in industry and academia since it can not only effectively treat rheumatic and other chronic and painful diseases,but also shows great potential in dental *** one of central elements of operability analysis,flexibility analysis is in charge of the quantitative assessment of the capability to guarantee the feasible operation in face of variations on uncertain *** this paper,we focus on the flexibility index calculation for the continuous ibuprofen manufacturing *** update existing state-of-the-art formulations,which traditionally lead to the max-max-max optimization problem,to approach the calculation of the flexibility index with a favorable *** regarding the size of the mathematical model and the computational CPU time of the modified method are examined by four *** addition to identifying the flexibility index without any consideration of control variables,we also investigate the effects of different combinations of control variables on the flexibility property to reveal the benefits from taking recourse actions into *** from systematic investigations are expected to provide a solid basis for the further control system design and optimal operation of continuous ibuprofen manufacturing.

关键词： Continuous manufacturing Pharmaceuticals Mathematical modeling Flexibility analysis Mixed integer programing Optimization

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Design insights into (FA)2BiCuI6 based double perovskite solar cells employing different charge transport layers

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Optical and Quantum Electronics 2024年第10期56卷 1-22页

作者： Yadav, Shivangi Lohia, Pooja Sahu, Anupam Dwivedi, D.K. Department of Electronics and Communication Engineering Madan Mohan Malaviya University of Technology Gorakhpur273010 India Department of Physics and Material Science Photonics and Photovoltaic Research Lab Madan Mohan Malviya University of Technology Gorakhpur273010 India

The non-toxic and organic–inorganic double perovskite material (FA)2BiCuI6, has garnered significant curiosity as a double perovskites solar cell (DPSC) absorber layer owing to its exceptional optoelectronic characteristics, making it well-suited for photovoltaic (PV) applications. To assess the viability of (FA)2BiCuI6 as a prospective material for the solar cell absorption layer, the SCAPS-1D simulation tool is used to explore the optimal configuration of solar cell involving the different electron transport layer (ETL) and hole transport layer (HTL). ETLs such as PCBM, Ag2S, ZnO0.3S0.7, C60, Nb2O5, and ZnSe, along with HTLs like Mg-CuCrO2, CBTS, CFTS, GO, SWCNT, and CuI, are thoroughly considered for integration with the absorber layer. Each ETL is methodically examined in combination with each HTL to identify the optimal pairing with (FA)2BiCuI6. This analysis leads to the identification of a champion DPSC configuration, which is then further optimized to achieve higher efficiency. The champion device structured as FTO/Nb2O5/(FA)2BiCuI6/Mg-CuCrO2/Se demonstrates highest power conversion efficiency approximately 24.42%, open-circuit voltage = 1.077 V, short-circuit current density = 26.03 mA/cm2 and fill factor of 87.12% are observed after optimization of various solar cell parameters. This proposed configuration aims to optimize light absorption, charge carrier transport, and extraction efficiency to achieve high solar cell performance. This work proposes the most suitable DPSC configurations for PV applications, analysing on the basis of variables such as absorber layer thickness, shallow acceptor density, defect density, and interfacial defect density. Additionally, the investigation delves into the influence of series and shunt resistances on proposed DPSC structures. To gain deeper insights, the analysis incorporates JV curves and quantum efficiency plots for the proposed champion configuration. Device performance is stable with temperature at 300 K. © The A

关键词： Perovskite

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Expanding super-resolution imaging versatility in organisms with multi-confocal image scanning microscopy

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National science Review 2024年第9期11卷 158-170页

作者： Wei Ren Meiling Guan Qianxi Liang Meiqi Li Boya Jin Guangxing Duan Liya Zhang Xichuan Ge Hong Xu Yiwei Hou Baoxiang Gao Sodmergen Peng Xi Department of Biomedical Engineering College of Future TechnologyPeking University National Biomedical Imaging Center Peking University Key Laboratory of Computational Optical Imaging Technology Chinese Academy of Sciences School of Life Sciences Peking University Key Laboratory of Analytical Science and Technology of Hebei Province College of Chemistry and Material ScienceHebei University Airy Technologies Co.Ltd.

Resolving complex three-dimensional(3D) subcellular dynamics noninvasively in live tissues demands imaging tools that balance spatiotemporal resolution, field-of-view and phototoxicity. Image scanning microscopy(ISM), as an advancement of confocal laser scanning microscopy, provides a 2-fold 3D resolution enhancement. Nevertheless, the relatively low imaging speed has been the major obstacle for ISM to be further employed in in vivo imaging of biological tissues. Our proposed solution, multi-confocal image scanning microscopy(MC-ISM), aims to overcome the limitations of existing techniques in terms of spatiotemporal resolution balancing by optimizing pinhole diameter and pitch, eliminating out-of-focus signals, and introducing a frame reduction reconstruction algorithm. The imaging speed is increased by 16times compared with multifocal structured illumination microscopy. We further propose a single-galvo scan,akin to the Archimedes spiral in spinning disk confocal systems, to ensure a high-speed and high-accuracy scan without the galvanometer's inertial motion. Benefitting from its high photon efficiency, MC-ISM allows continuous imaging of mitochondria dynamics in live cells for 1000 frames without apparent phototoxicity, reaching an imaging depth of 175 μm. Noteworthy, MC-ISM enables the observation of the inner membrane structure of living mitochondria in Arabidopsis hypocotyl for the first time, demonstrating its outstanding performance.

关键词： super-resolution imaging confocal image scanning microscopy

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Does friction contribute to formability improvement using servo press?

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Friction 2023年第5期11卷 820-835页

作者： Kali PRASAD Aishwary GUPTA Hariharan KRISHNASWAMY Uday CHAKKINGAL Dilip K.BANERJEE Myoung-Gyu LEE Department of Mechanical Engineering Indian Institute of Technology MadrasChennai 600036India Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Metallurgical and Materials Engineering Indian Institute of Technology MadrasChennai 600036India Material Measurement Laboratory National Institute of Standards and Technology(NIST)Gaithersburg 20899USA

Servo press forming machines are advanced forming systems that are capable of imparting interrupted punch motion,resulting in enhanced room temperature *** exact mechanism of the formability improvement is not yet *** contribution of interrupted motion in the ductility improvement has been studied through stress relaxation phenomena in uniaxial tensile(UT)***,the reason for improved formability observed when employing servo press is complicated due to the additional contribution from frictional *** the present work,an attempt is made to decouple the friction effect on formability improvement *** improved formability is studied using a hole expansion test(HET).The limit of forming during hole expansion is modeled using the Hosford–Coulomb(HC)damage criteria,which is implemented as a user subroutine in a commercial explicit finite element(FE)*** the contribution of stress relaxation is accounted for in the evolution of the damage variable during interrupted ***,the difference between simulation and experimental hole expansion ratio(HER)can be used to decouple the friction effect from the overall formability improvement during hole *** improvement in HER due to stress relaxation and friction effect is *** study showed that the model effectively captures the hole expansion deformation process in both monotonic and interrupted loading *** to stress relaxation,friction effect played a major role during interrupted HET.

关键词： servo press hole expansion test(HET) dual phase steel finite element(FE)analysis Hosford-Coulomb(HC)ductile fracture model

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High-Energy Batteries:Beyond Lithium-Ion and Their Long Road to Commercialisation

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Nano-Micro Letters 2022年第6期14卷 116-164页

作者： Yulin Gao Zhenghui Pan Jianguo Sun Zhaolin Liu John Wang Department of Materials Science and Engineering National University of SingaporeSingapore 117574Singapore ST Engineering Advanced Material Engineering Pte.Ltd. Singapore 619523Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore School of Materials Science and Engineering Tongji UniversityShanghai 201804China

Rechargeable batteries of high energy density and overall performance are becoming a critically important technology in the rapidly changing society of the twenty-first *** lithium-ion batteries have so far been the dominant choice,numerous emerging applications call for higher capacity,better safety and lower costs while maintaining sufficient *** design space for potentially better alternatives is extremely large,with numerous new chemistries and architectures being simultaneously *** include other insertion ions(*** and numerous multivalent ions),conversion electrode materials(***,metallic anodes,halides and chalcogens)and aqueous and solid ***,each of these potential“beyond lithium-ion”alternatives faces numerous challenges that often lead to very poor cyclability,especially at the commercial cell level,while lithium-ion batteries continue to improve in performance and decrease in *** review examines fundamental principles to rationalise these numerous developments,and in each case,a brief overview is given on the advantages,advances,remaining challenges preventing cell-level implementation and the state-of-the-art of the solutions to these ***,research and development results obtained in academia are compared to emerging commercial examples,as a commentary on the current and near-future viability of these“beyond lithium-ion”alternatives.

关键词： High energy density Beyond lithium-ion batteries Multivalent-ion batteries Conversion electrode materials Electrolyte

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A study on biofuel generation from microalgae species

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materials Today: Proceedings 2022年 57卷 1660-1665页

作者： Aniruddha, R. Rajendran, A. Sindhu, Subramanian Department of Chemical Engineering and Material Science Amrita School of Engineering Coimbatore Amrita Vishwa Vidyapeetham 641112 India Department of ECE Amrita College of Engineering & Technology Nagercoil India

Biofuels are energy sources made from organic matter, which makes them renewable and eco-friendly. They are classified based on their feedstocks and produced from microalgae species come under third-generation. Research on biofuel from algae was ignited because of its ease of cultivation and harvesting. But the problem with algae-based biofuel is in the selection of strains. There are millions of algae strains in this world but only a few of them are currently studied by researchers. In this review paper, the need for biofuel, generations in biofuel, few suitable microalgae strains for biofuel, and their fatty acid contents are discussed. © 2021

关键词： Biofuels

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Composite coatings of S-HA nanoparticles and Schiff base on ZE21B alloy for stronger corrosion resistance and biological performance

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Journal of Magnesium and Alloys 2024年第11期12卷 4547-4560页

作者： Zhonghua Xue Xiaojing Sun Hang Li Mujahid Iqbal Liujie Qi Fei Wang Yachen Hou Jingan Li Shaokang Guan School of Material Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloy&Key Laboratory of materials processing and mold technology(Ministry of Education) Zhengzhou University100 Science RoadZhengzhou 450001China Department of Physics University of Agriculture FaislabadAgriculture University RoadFaisalabad 38000Pakistan Department of Cardiology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan450052China

In order to prolong the service time and enhance the biocompatibility of magnesium(Mg)alloys used for cardiovascular scaffolds,the composite coatings of Schiff base(corrosion inhibitor)and sulfonated hyaluronic acid(S-HA)nanoparticles(NP@S-HA)with different sulfur content(10.02 wt%and 11.55wt%)were prepared on ZE21B alloy by means of electrostatic spraying with spraying time of 0.5 min,1.0 min and 1.5 min in this *** a series of representations including corrosion experiments and biological characterization,the composite coatings with a sulfur content of 11.55wt%and a spray time of 1.0 min were finally picked due to its better comprehensive performances,which provides a new possibility for the surface modification of degradable Mg alloy cardiovascular scaffolds.

关键词： Biodegradable magnesium alloy Sulfonated hyaluronic acid Nanoparticles Corrosion resistance Biocompatibility

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