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NiTi alloys with simultaneous equiaxed-grain strength and columnar-grain ductility manipulated by direct energy deposition

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Journal of Alloys and Compounds 2025年 1028卷

作者： Lu, Jiaqi Zhang, Chi Liu, Yang Huang, Zhifeng Hou, Huilong Huang, Aijun Chen, Fei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Longzhong Laboratory Xiangyang441106 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China School of Materials Science and Engineering Beihang University Beijing100191 China Hangzhou310023 China Monash University Notting HillVIC3168 Australia

NiTi alloys prepared by additive manufacturing (AM) often have coarse columnar grains showing poor tensile superelasticity, strength, and ductility, significantly impairing part qualification and targeted applications. In this work, we used laser-engineered net shaping (LENS) to fabricate NiTi alloys with lamellar structures which consist of fine nearly equiaxed grains, columnar grains, and high-density dislocations, through periodically alternating processing parameters. This strategy can partially keep the equiaxed grains produced by the transformation from columnar grains to equiaxed grains (CET) at the top of the deposited layer, and interrupt the epitaxial growth of columnar grains in AM-ed NiTi alloys. The results show that NiTi alloys with lamellar structures exhibit an excellent combination of strength and ductility with a tensile strength of 649 MPa strain of 17.5 %, a maximum recovery strain of 5.3 %, and a stable recovery strain of 3.1 % after 20 cycles. Our findings may increase the range of adjustable microstructures and combinations of properties in NiTi alloys and provide a new idea for microstructure modification and reinforcement of AM shape memory alloy. © 2025 Elsevier B.V.

关键词： Tensile strain

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synthesis and structure of NaNbO_3 ceramic powders in ultrahigh pressure field

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Science China(Technological Sciences) 2007年第5期50卷 658-663页

作者： CAO MingHe TIAN Wei LI MingFa SUN WenHua HU MingJi LIU HanXing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The NaNbO3 powders were synthesized and their crystal structure changes were analyzed by ultrahigh pressure up to 6 *** results indicate that the pure NaNbO3 powders can be synthesized at 300℃ under a pressure of 4 GPa, to sig- nificantly restrain the Na element volatilization compared with the traditional syn- thesis method. It is found that the crystal structure of synthesized NaNbO3 changes from low symmetry to high symmetry with the increase of the pressure.

关键词： pressure synthesis, NaNbO3 powder, crystal structure

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Low Pressure Chemical Vapor Deposited Perovskite Enables all Vacuum-Processed Monolithic Perovskite-Silicon Tandem Solar Cells

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advanced Energy materials 2025年

作者： Zhang, Yuxi Zhu, Yanqing Sun, Jingsong Hu, Min Chen, Jiahui Duan, Bingxin Hu, Shenghan Hou, Peiran Tan, Wen Liang Ku, Zhiliang Yang, Weiguang Lu, Jianfeng State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China Zhejiang Baima Lake Laboratory Co. Ltd. Zhejiang Hangzhou310000 China School of Electronic and Electrical Engineering Hubei Province Engineering Research Center for Intelligent Micro-Nano Medical Equipment and Key Technologies Wuhan Textile University Wuhan430200 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China ClaytonVIC3168 Australia Solar Technology Co. Ltd. Jiangsu Taizhou225500 China

Low-pressure chemical vapor deposition (CVD) is a promising technique for metal halide perovskite photovoltaics fabrication due to its low manufacturing cost, conformal coverage, and high scalab.lity for industry-scale fabrication. However, the lack of knowledge of the reaction kinetics makes the solar cell performance lag behind its solution-processed counterpart. Herein, the perovskite formation and crystal growth process in the CVD process are studied by unraveling the mechanism of ion diffusion via tracking the vapor–solid reaction with various semi-in-situ characterizations. It is found that Cs+ can migrate along the perovskite lattice and uniformly distribute in the vertical direction of the final perovskite film even changing the deposition order of CsBr and PbI2 in the solid source, whereas this order can significantly affect the growth kinetics and the bandgap of the perovskite. Depositing CsBr before PbI2 results in a faster conversion of inorganic precursors to perovskite phase, yielding a wider bandgap perovskite. Finally, we fabricated semi-transparent perovskite cells using all-vapor deposition process, which showed a champion efficiency of 18.7% and it retained ≈94% of its initial performance after 200 h of continuous operation. Moreover, using this all-vapor deposition process, we achieved a champion efficiency of 26.9% for monolithic perovskite-silicon tandem solar cells. © 2025 Wiley-VCH GmbH.

关键词： Low pressure chemical vapor deposition

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External field-assisted catalysis

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eScience 2025年

作者： Linbo Jiang Lintao Jiang Xu Luo Ruidong Li Qingqu Zhou Weihao Zeng Jun Yu Lei Chen Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070 China

In recent years, substantial effort has been dedicated to improving the intrinsic catalytic activity of catalysts through structural modification, component regulation, and chemical state optimization. However, complexity in the design and construction of catalysts, and the possibility of encountering performance ceilings, may constrain their widespread use. Currently, the introduction of in situ external fields, such as force, electric, magnetic, acoustic, light, and thermal fields, is an attractive approach to enhance the catalytic efficiency of catalysts. Such in situ physical fields feature continuity, reversibility, and controllab.lity, and can exert external force or energy on catalysts, thereby affecting their microscopic structures and electron arrangements, accelerating their mass transfer and reaction kinetics. Mutual coupling and conversion among different external fields are also worth exploring. Various in situ external field effects work in multifaceted ways to promote catalysis in energy-environment systems by optimizing mass/energy transfer processes, modifying structures, and accelerating catalytic reaction kinetics, thereby significantly improving the catalytic properties of materials. This review summarizes and analyzes the latest developments in external field-assisted methods for boosting catalyst performance. The external field effect, related catalysis mechanism, and external field-enhanced catalysis are highlighted, and we discuss future challenges, countermeasures, and opportunities for external field-assisted catalysis and beyond.

关键词： Catalysis External field Field-assisted effects Reaction mechanism

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Research on Ultrafine Tungsten Carbide-Cobalt(WC-Co) Cemented Carbide Rods of Miniature Drills for Highly Integrated Printed Circuit Board(PCB)

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Journal of materials Science & technology 2005年第3期21卷 353-356页

作者： Xiaoliang SHI, Gangqin SHAO, Xinglong DUAN and Runzhang YUAN state key lab.ratory of advanced technology for materials synthesis & processing, Wuhan University of technology, Wuhan 430070, China Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Nanocrystalline tungsten carbide-cobalt (WC-Co) composite powders produced through spray thermal decomposition-continuous reduction and carburization technology were used to prepare φ3.25 mm×38 mm ultrafine tungsten carbide-cobalt (WC-Co) cemented carbide rods through vacuum sintering plus sinterhip technology. The microstructure, Vickers hardness, density and Rockwell A hardness (HRA), transverse rupture strength (TRS), saturated magnetization and coercivity force were tested. The results show that the average grain size of the sintering body prepared through vacuum sintering plus sinterhip technology was 430 nm; transverse rupture strength (TRS) was 3850 MPa; Vickers hardness was 1890 and Rockwell A hardness of sintering body was 93. High strength and high hardness ultrafine WC-Co cemented carbide rods used to manufacture printed circuit board (PCB) drills were obtained.

关键词： Nanocrystalline Composite powder Cemented carbide Rods

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synthesis and Characterization of CaF_2 Nanoparticles with Different Doping Concentrations of Er^(3+)

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Nano-Micro Letters 2011年第2期3卷 73-78页

作者： Jinghong Song Guanglin Zhi Yan Zhang Bingchu Mei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Calcium fluoride nanoparticles with various amounts of erbium ion dopants were prepared by CTAB/C_4 H_9OH/C_7H_(16)/H_2O reverse micro-emulsion *** nanoparticles were studied by X-ray diffraction(XRD),transmission electron microscopy(TEM),fourier transform infrared spectroscopy(FTIR),absorption and fluorescence *** XRD patterns indicate a typical cubic fluorite structure and no other *** results show the synthesized particles having uniform grain size and without *** spectra reveal that there are some amounts of-OH,NO_3^-and other organic functional groups on the particle surfaces before the annealing *** absorption peaks and bands are present in the absorption spectra,corresponding to the rich energy levels of erbium *** Red-Shift of absorption bands and Blue-Shift of fluorescence peaks can be attributed to the weakened energy level split as a result of the decrease in crystal field strength.

关键词： CaF2 Nanoparticles Doping Erbium ions

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Chiral polymer-based biointerface materials

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Science China Chemistry 2014年第4期57卷 540-551页

作者： LI MinMin QING GuangYan ZHANG MingXi SUN TaoLei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Chirality is a unique phenomenon in nature. Chiral interactions play an important role in biological and physiological process- es, which provides much inspiration for scientists to develop cbiral materials. As a breakthrough from traditional materials, bi- ointerface materials based on chiral polymers have attracted increasing interest over the past few years. Such materials ele- gantly combine the advantages of chiral surfaces and traditional polymers, and provide a novel solution not only for the inves- tigation of chiral interaction mechanisms but also for the design of biomaterials with diverse applications, such as in tissue en- gineering and biocompatible materials, bioregulation, chiral separation and chiral sensors. Herein, we summarize recent ad- vances in the study of chiral effects and applications of chiral polymer-based biointerface materials, and also present some challenges and perspectives.

关键词： chirality polymer chiral interaction biointerface materials chiral effects applications

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Hollow heterojunction nanocages of zeolitic imidazolate framework-8@zinc sulfide@copper sulfide for synergistic tumor therapy

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Journal of Colloid and Interface Science 2025年 695卷 137811页

作者： Chen, Yuqin Sun, Benjian Yu, Zhouyu Cheng, Zhen Chen, Si Chang, Baisong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Neurology Xiangya Hospital Central South University Changsha410008 China State Key Laboratory of Drug Research Molecular Imaging Center Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai201203 China

The tumor microenvironment (TME) poses significant challenges for achieving efficient cancer remission through monotherapy, making multimodal synergistic therapy a key strategy in tumor treatment. Here, we designed and constructed a hollow core–shell nanocage based on zeolitic imidazolate framework-8 (ZIF-8), zeolitic imidazolate framework-8@zinc sulfide@copper sulfide (ZIF-8@ZnS@CuS, denoted as ZZCS), for the combined application of chemodynamic therapy (CDT), photothermal therapy (PTT) and photocatalytic therapy (PCT). The Cu2+ ions in ZZCS imparted peroxidase (POD)-like and catalase (CAT)-like activities, enabling the generation of toxic hydroxyl radicals ([rad]OH) through POD-like catalysis to enhance CDT effect, while also reacting with overexpressed glutathione (GSH) to elevate intracellular reactive oxygen species (ROS) levels. To overcome the inhibitory effects of hypoxia on PCT in the TME, ZZCS catalyzed the production of O2 from endogenous hydrogen peroxide (H2O2) via CAT-like activity, alleviating hypoxia and enhancing the PCT effect. Furthermore, hollow core–shell heterojunction structure of ZZCS exhibited excellent near-infrared absorption and multiple light reflection effects. Under 808 nm laser irradiation, ZZCS showed a high photothermal conversion efficiency (η = 78.1 %) and generated significant amounts of ROS ([rad]OH, [rad]O2−, 1O2), enabling the synergistic elimination of tumor cells via PTT and PCT. Benefiting from the combined CDT/PTT/PCT effects, ZZCS demonstrated excellent therapeutic efficacy in vivo, nearly eradicating tumors. This study may provide a promising foundation and potential direction for advancing multimodal tumor therapy. Future studies will focus on conducting long-term investigations to systematically evaluate the efficacy of ZZCS core–shell nanocages in achieving durable tumor eradication. © 2025 Elsevier Inc.

关键词： Light reflection

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Alumina Ceramics Fabricated by in-situ Consolidation of Pre-gelling Starch

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Journal of Wuhan University of technology(materials Science) 2018年第3期33卷 758-766页

作者：朱田丽王友法 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

An in-situ consolidation method was developed and optimized to successfully fabricate alumina ceramics using pre-gelling starch. Our results showed that the obtained ceramics have more homogeneous microstructure, higher density, higher flexural strength, and favorable biocompatibility compared to the regular one. During the process, cornstarch granules swelled and deformed but no fracture was observed. After the cornstarch granules bursted, alumina particles were suspended uniformly in the three-dimensional network structure to generate a much smoother surface. Below 0.5 wt% higher cornstarch content increased the flexural strength of prepared ceramics, while above 0.5 wt% the mechanical properties were compromised. Therefore the cornstarch content of 0.5% was the optimal concentration to achieve the highest mechanical strength of the prepared ceramics, with a measured flexural strength of 341 MPa, and a relative density of 96.01%.

关键词： pre-gelling starch in-situ consolidation alumina-ceramic flexural strength biocompatibility

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5H-Fluoreno [3,2-b:6,7-b’] Dithiophene Based Non-fullerene Small Molecular Acceptors for Polymer Solar Cell Application

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Journal of Wuhan University of technology(materials Science) 2019年第5期34卷 1220-1227页

作者： WU Jiansheng XIAO Shengqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Two novel non-fullerene small molecule acceptors were prepared with the conjugated backbone of 5 H-fluoreno[3, 2-b:6, 7-b’] dithiophene carrying the electron deficient unit of dicyanomethylene indanone(DICTFDT) and rhodanine(TFDTBR), respectively. The two acceptors exhibited excellent thermal stability and strong absorption in the visible region. The LUMO level is estimated to be at-3.89 eV for DICTFDT and-3.77 eV for TFDTBR. When utilized as the acceptor in bulk heterojunction polymer solar cells with the polymer donor of PBT7-Th, the optimized maximum power conversion efficiency of 5.12% and 3.95% was obtained for the device with DICTFDT and TFDTBR, respectively. The research demonstrates that 5 H-fluoreno[3, 2-b:6, 7-b’] dithiophene can be an appealing candidate for constructing small molecular electron acceptor towards efficient polymer:non-fullerene bulk heterojunction solar cells.

关键词： polymer solar cells bulk heterojunction non-fullerene acceptor

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