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New insights into the hardening and pitting corrosion mechanisms of thermally aged duplex stainless steel at 475℃:A comparative study between 2205 and 2101 steels

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Journal of materials science & Technology 2022年第3期98卷 123-135页

作者： R.Silva G.S.Vacchi C.L.Kugelmeier I.G.R.Santos A.A.Mendes Filho D.C.C.Magalhães C.R.M.Afonso V.L.Sordi C.A.D.Rovere Munir Rachid Corrosion Laboratory Department of Materials EngineeringFederal University of São CarlosRodovia Washington Luis Km 23513565-905 São CarlosSPBrazil Engineering Modeling and Applied Social Sciences Center(CECS)Federal University of ABCAvenida dos Estados 500109210580 Santo AndréSPBrazil Federal University of São Carlos Graduate Program in Materials Science and EngineeringBrazil

In this study,the relationship between spinodal decomposition and the formation of Ni-rich clusters and G-phase in the ferrite on hardening and pitting corrosion of two thermally aged duplex stainless steels(DSSs)at 475℃was *** indicate that,for 2205 DSS,pitting corrosion behavior is influenced by the presence and size of G-phase precipitates for longer aging times,but this contribution is masked by the advanced stage of spinodal decomposition in the ferritic *** the other hand,for 2101 DSS,the formation of Cr-richer nitrides impairs pitting corrosion resistance more than spinodal decomposition.

关键词： Duplex stainless steel Spinodal decomposition G-phase precipitation Pitting corrosion Hardening

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Construction of SiO_x/nitrogen-doped carbon superstructures derived from rice husks for boosted lithium storage

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Journal of Colloid and Interface science 2022年第PT 1期606卷 784-792页

作者： Guo, Xiaotian Li, Wenting Geng, Pengbiao Zhang, Qinyi Pang, Huan Xu, Qiang School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225009 Jiangsu China Department of Materials Science and Engineering and SUSTech Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology (SUSTech) Xueyuan Ave Nanshan Shenzhen 518055 Guangdong China

Silicon sub-oxides (SiOx) are increasingly becoming a prospective anode material for lithium-ion batteries (LIBs). Nevertheless, inferior electrical conductivity and drastic volume fluctuation upon cycling significant... 详细信息

Silicon sub-oxides (SiO_x) are increasingly becoming a prospective anode material for lithium-ion batteries (LIBs). Nevertheless, inferior electrical conductivity and drastic volume fluctuation upon cycling significantly hamper the electrochemical performance of SiO_x. In this work, rice husks (RHs)-derived pitaya-like SiO_x/nitrogen-doped carbon (SNC) superstructures have been prepared by a simple electrospray-carbonization approach. SiO_x nanoparticles (NPs) are well-dispersed in a spherical nitrogen-doped carbon (NC) matrix. The carbon frameworks discourage the aggregation of SiO_x NPs, facilitating the kinetics for ion diffusion and charge transfer, and maintaining structural stability upon cycling, thus bringing about improved electrochemical performance. When the optimized SNC superstructures with SiO_x content of 64.3% are utilized as LIBs anodes, a stable specific capacity of 622.8 mA h g⁻¹ after 100 cycles at 0.1 A g⁻¹, and an excellent long cycle performance of 190.1 mA h g⁻¹ after 5000 cycles at 5 A g⁻¹ are obtained. This effective and universal synthetic strategy for fabricating controllable superstructures offers insights into the development of high-performance LIBs. © 2021 Elsevier Inc.

关键词： Electrospray Li-ion battery Nitrogen-doped carbon Rice husks-derived SiO2 Superstructure

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Rational construction and triethylamine sensing performance of foam shapedα-MoO_(3)@SnS_(2) nanosheets

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Chinese Chemical Letters 2022年第1期33卷 567-572页

作者： Xianhui Dong Qing Han Yaru Kang Haidong Li Xinyu Huang Zhengtao Fang Huimin Yuan Ahmed A.Elzatahry Zongtao Chi Guanglei Wu Wanfeng Xie School of Material Science&Engineering Institute of Materials for Energy and EnvironmentState Key Laboratory of Bio-Fibers and Eco-TextilesQingdao UniversityQingdao 266071China School of Electronics and Information Qingdao UniversityQingdao 266071China College of Physics and Electronic Engineering Qilu Normal UniversityJi'nan 250200China Materials Science and Technology Program College of Arts and SciencesQatar UniversityPO Box 2713DohaQatar

Owing to their high surface area,stable structure and easy fabrication,composite nanomaterials with encapsulation structures have attracted considerable research interest as sensing materials to detect volatile organic ***,a hydrothermal route is designed to prepare foam shapedα-MoO_(3)@SnS_(2)nanosheets that exhibit excellent sensing performance for triethylamine(TEA).The developed sensor,based onα-MoO_(3)@SnS_(2)nanosheets,displays a high response of 114.9 for 100 ppm TEA at a low working temperature of 175℃with sensitivity higher than many other reported *** addition,the device shows a wide concentration detection range(from 500 ppb to 500 ppm),good stability after exposure to air for 80 days,and excellent *** superior sensing characteristics of the developed sensor are attributed to the high crystallinity ofα-MoO_(3)/SnS_(2),excessive and accessible active sites provided by the good permeability of porous SnS_(2)shells,and the excellent conductivity of the encapsulation heterojunction ***,the foam shapedα-MoO_(3)@SnS_(2)nanosheets presented herein have promising practical applications in TEA gas sensing devices.

关键词： MoO_(3) SnS_(2) Encapsulation heterojunction Triethylamine Sensing performance

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Method for the extraction of circulating nucleic acids based on MOF reveals cell-free RNA signatures in liver cancer

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National science Review 2024年第1期11卷 94-106页

作者： Yuqing Sun Haixin Yu Shaoqing Han Ruoxi Ran Ying Yang Yongling Tang Yuhao Wang Wenhao Zhang Heng Tang Boqiao Fu Boshi Fu Xiaocheng Weng Song-Mei Liu Hexiang Deng Shuang Peng Xiang Zhou College of Chemistry and Molecular Sciences Key Laboratory of Biomedical Polymers-Ministry of Education Wuhan University Department of Digestive Surgical Oncology Union Hospital Tongji Medical College Huazhong University of Science and Technology Cancer Center Union HospitalTongji Medical CollegeHuazhong University of Science and Technology Department of Clinical Laboratory Center for Gene Diagnosis and Program of Clinical Laboratory Zhongnan Hospital of Wuhan University College of Chemistry and Materials Science Hubei Engineering University Department of Pharmacology School of Pharmacy China Medical University Taikang Center for Life and Medical Sciences Wuhan University Department of Hematology Zhongnan Hospital of Wuhan University

Cell-free RNA(cf RNA) allows assessment of health, status, and phenotype of a variety of human organs and is a potential biomarker to non-invasively diagnose numerous diseases. Nevertheless, there is a lack of highly efficient and bias-free cf RNA isolation technologies due to the low abundance and instability of cf ***, we developed a reproducible and high-efficiency isolation technology for different types of cell-free nucleic acids(containing cf RNA and viral RNA) in serum/plasma based on the inclusion of nucleic acids by metal-organic framework(MOF) materials, which greatly improved the isolation efficiency and was able to preserve RNA integrity compared with the most widely used research kit method. Importantly, the quality of cf RNA extracted by the MOF method is about 10-fold that of the kit method, and the MOF method isolates more than three times as many different RNA types as the kit method. The whole transcriptome mapping characteristics of cf RNA in serum from patients with liver cancer was described and a cf RNA signature with six cf RNAs was identified to diagnose liver cancer with high diagnostic efficiency(area under curve = 0.905 in the independent validation cohort) using this MOF method. Thus, this new MOF isolation technique will advance the field of liquid biopsy, with the potential to diagnose liver cancer.

关键词： MOF circulating cell-free RNA biomarker liver cancer diagnosis

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CsBr Immersion for Organic-Inorganic Hybrid Perovskite-Based Memristors: Controllable Grain, Poole-Frenkel Emission, and Electrical Properties

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ACS Applied Electronic materials 2023年第11期5卷 5916-5927页

作者： Chen, Yen-Shuo Lin, Ching Chang Lin, Chih Wei Tsai, Shang Yu Ko, Fu-Hsiang Department of Materials Science and Engineering National Yang Ming Chiao Tung University 1001 University Road Hsinchu30010 Taiwan Department of General Systems Studies Graduate School of Arts and Sciences The University of Tokyo 3-8-1 Komaba Tokyo153-8902 Japan

Organic-inorganic hybrid perovskites (OIHPs) have emerged as potential candidates for active layers in resistive switching memory (RSM) devices and have recently attracted much interest in academia and industry. In RSM devices based on the OIHPs, grain boundaries play an important role in the formation of resistive switching paths because the grain boundary regions contain many defects that favor the formation of conducting filaments. In this study, the effect of methylammonium lead iodide (MAPbI3)/indium tin oxide (ITO) substrates with various post-treatments on RSM devices is demonstrated. To reduce the defect density, variation of the immersion time of the MAPbI3 surface in CsI, MABr, and CsBr solutions promotes grain size enlargement and decreases the number of grain boundaries. The largest average grain size of the OIHP film obtained with 10 s of CsBr solution immersion (CsBr-10 s) for RSM devices is 1386.5 nm, and the corresponding photoluminescence (PL) intensity demonstrates the highest signal. The grain size can be well controlled by varying the immersion time in the ionic solution, and the appropriate post-treatment time is 10 s. Compared to untreated OIHP devices (on/off current ratio ∼102), perovskite film (MAPbI3)-based RSM devices with CsBr-10 s achieve a > 105 on/off current ratio and >104 s data retention. The conduction mechanism of the RSM devices with proper immersion treatment switches from the space-charge-limited current (SCLC) mechanism to Poole-Frenkel (PF) emission. This observation confirms that a low density of defects from fewer grain boundaries for RSM devices makes the conducting filaments in the memristors more susceptible to activation. Most OIHP-based devices suffer from humidity damage issues;however, the device fabrication and storage in our experiment are performed in ambient air. The results indicate that perovskite memory based on suitable ionic solution immersion exhibits great potential for use in future high-performance memri

关键词： Memristors

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engineering of dendritic dopant-free hole transport molecules:enabling ultrahigh fill factor in perovskite solar cells with optimized dendron construction

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science China Chemistry 2021年第1期64卷 41-51页

作者： Wei Chen Yang Wang Bin Liu Yajun Gao Ziang Wu Yongqiang Shi Yumin Tang Kun Yang Yujie Zhang Weipeng Sun Xiyuan Feng Frédéric Laquai Han Young Woo Aleksandra B.Djurisic Xugang Guo Zhubing He Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics The University of Hong KongPokfulamHong KongChina King Abdullah University of Science and Technology KAUST Solar CenterPhysical Sciences and Engineering DivisionMaterial Science and Engineering ProgramThuwal 23955-6900Kingdom of Saudi Arabia Department of Chemistry Korea UniversitySeoul 02841South Korea

Developing dopant-free hole-transporting materials(HTMs)for high-performance perovskite solar cells(PVSCs)has been a very active research topic in recent years since HTMs play a critical role in optimizing interfacial charge carrier kinetics and in turn determining device ***,a novel dendritic engineering strategy is first utilized to design HTMs with a D-A type molecular framework,and diphenylamine and/or carbazole is selected as the building block for constructing *** HTMs show good thermal stability and excellent film morphology,and the key optoelectronic properties could be fine-tuned by varying the dendron *** them,MPA-Cz-BTI and MCz-Cz-BTI exhibit an improved interfacial contact with the perovskite active layer,and non-radiative recombination loss and charge transport loss can be effectively ***,high power conversion efficiencies(PCEs)of 20.8%and 21.35%are achieved for MPA-Cz-BTI and MCz-Cz-BTI based devices,respectively,accompanied by excellent long-term storage *** encouragingly,ultrahigh fill factors of 85.2%and 83.5%are recorded for both devices,which are among the highest values reported to *** work demonstrates the great potential of dendritic materials as a new type of dopant-free HTMs for high-performance PVSCs with excellent FF.

关键词： dendritic molecules hole-transporting materials dopant-free ultrahigh fill factor perovskite solar cells

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Scaled-up synthesis of defect-rich layered double hydroxide monolayers without organic species for efficient oxygen evolution reaction

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Green Energy & Environment 2022年第5期7卷 975-982页

作者： Haoyuan Chi Jingwen Dong Tian Li Sha Bai Ling Tan Jikang Wang Tianyang Shen Guihao Liu Lihong Liu Luyi Sun Yufei Zhao Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China College of Chemistry Key Laboratory of Theoretical&Computational Photochemistry of Ministry of EducationBeijing Normal UniversityBeijing100875China Polymer Program Institute of Materials Science and Department of Chemical&Biomolecular EngineeringUniversity of ConnecticutStorrsConnecticut06269USA Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

The scaled-up synthesis of organic-free monolayer nanomaterials is highly desirable,especially in obtaining green energy by *** this study,a method for the scaled-up synthesis of the series of monolayer layered double hydroxides(LDHs)without the addition of organic solvents is reported via the separate nucleation and aging steps *** resulting monolayer LDHs with the thicknesses of less than 1 nm showed a narrow thickness distribution.X-ray absorption fine-structure revealed that monolayer NiFe-LDH nanosheets have a number of oxygen and metal vacancies *** a practical application,monolayer NiFe-LDH nanosheets containing defects showed an enhanced electrocatalytic water oxidation activity compared with that of bulk *** functional theory calculations uncovered that excellent catalytic activity is attributed to vacancies *** proposed method is an economical and universally applicable strategy for the scaled-up production of monolayer LDHs.

关键词： process synthesis monolayer

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3D Magnetization Reconstruction for Lorentz Microscopy using Differential programming

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1756-1757页

作者： McCray, Arthur R C Cherukara, Mathew Petford-Long, Amanda K. Phatak, Charudatta Materials Science Division Argonne National Laboratory Lemont IL United States Applied Physics Program Northwestern University Evanston IL United States Advanced Photon Source Argonne National Laboratory Lemont IL United States Department of Materials Science and Engineering Northwestern University Evanston IL United States

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RadonPy:automated physical property calculation using all-atom classical molecular dynamics simulations for polymer informatics

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npj Computational materials 2022年第1期8卷 2155-2169页

作者： Yoshihiro Hayashi Junichiro Shiomi Junko Morikawa Ryo Yoshida The Institute of Statistical Mathematics(ISM) Research Organization of Information and Systems10-3 Midori-choTachikawaTokyo190-8562Japan Department of Mechanical Engineering The University of Tokyo7-3-1 HongoBunkyoTokyo113-8656Japan Institute of Engineering Innovation The University of Tokyo2-11 YayoiBunkyo-kuTokyo113-0032Japan Department of Materials Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo152-8552Japan Research and Services Division of Materials Data and Integrated System(MaDIS) National Institute for Materials Science(NIMS)1-2-1 SengenTsukubaIbaraki305-0047Japan Department of Statistical Science School of Multidisciplinary ScienceThe Graduate University of Advanced Studies(SOKENDAI)10-3 Midori-choTachikawaTokyo190-8562Japan

The spread of data-driven materials research has increased the need for systematically designed materials property ***,the development of polymer databases has lagged far behind other material *** present RadonPy,an open-source library that can automate the complete process of all-atom classical molecular dynamics(MD)simulations applicable to a wide variety of polymeric ***,15 different properties were calculated for more than 1000 amorphous *** MD-calculated properties were systematically compared with experimental data to validate the calculation conditions;the bias and variance in the MD-calculated properties were successfully calibrated by a machine learning *** the high-throughput data production,we identified eight amorphous polymers with extremely high thermal conductivity(>0.4 W∙m^(–1)∙K^(–1))and their underlying *** to the advancement of materials informatics since the advent of computational property databases for inorganic crystals,database construction using RadonPy will promote the development of polymer informatics.

关键词： property calculation dynamics

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A three-dimensional crosslinked chitosan sulfate network binder for high-performance Li-S batteries

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Journal of Energy Chemistry 2021年第5期30卷 171-178页

作者： Jianwen Feng Huan Yi Zhiwen Lei Jun Wang Hongbo Zeng Yonghong Deng Chaoyang Wang Research Institute of Materials Science South China University of TechnologyGuangzhou 510640GuangdongChina Department of Materials Science&Engineering Academy for Advanced Interdisciplinary StudiesGuangdong Provincial Key Laboratory of Energy Materials for Electric PowerSouthern University of Science and Technology(SUSTech)Shenzhen 518055GuangdongChina Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada

Poor cycling performance caused by the shuttle effect of polysulfides is the main obstacle in the development of advanced lithium-sulfur(Li-S)*** polymer binders with polar groups can effectively adsorb polysulfides chemically,thereby suppressing the shuttle ***,a robust three-dimensional crosslinked polymer network,which demonstrates excellent mechanical property and strong affinity for polysulfides,is prepared by the aldimine condensation and coordination *** crosslinked chitosan sulfate network(CCSN)significantly enhances the cycling performance and rate capability of the sulfur *** CCSN-based sulfur cathode exhibits a high initial discharge capacity of 824 m Ah g^(-1) with only 0.082%average capacity loss per cycle at 1 *** a high rate of 4 C,the cathode exhibits a high capacity retention of 84.8%after 300 ***,the CCSN-based sulfur cathode exhibits an excellent cycling performance at a high sulfur loading of 2.5 mg cm^(-2),which indicates the excellent mechanical strength and binding performance of the CCSN binder for high-energy density Li-S *** study demonstrates a viable approach for developing high-performance Li-S batteries for practical application.

关键词： Chitosan Crosslinked binder Polysulfide Lithium-sulfur battery

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