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Materials & Design 51건

  1. [해외논문]   Effect of rate-dependent constitutive equations on the tensile flow behaviour of DP600 using Rousselier damage model   SCIE

    Sarraf, I.S. (Department of Mechanical, Automotive, and Materials Engineering, University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada ) , Jenab, A. (Department of Mechanical, Automotive, and Materials Engineering, University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada ) , Boyle, K.P. (CanmetMATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton, ONL8P 0A1, Canada ) , Green, D.E. (Department of Mechanical, Automotive, and Materials Engineering, University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada)
    Materials & Design v.117 ,pp. 267 - 279 , 2017 , 0264-1275 ,

    초록

    Abstract In the current research, the Rousselier ductile damage model was employed to model hardening, plastic instability and damage properties of DP600 during uniaxial tension in a wide range of strain rates (from 0.001 to 1000s −1 ). Also, various well-known phenomenological hardening functions, such as Johnson–Cook and KHL as well as a modified version of Johnson-Cook and multiplicative combinations of Voce with other strain-rate hardening functions have been fitted to experimental flow curves via a new combination of non-linear regression and Markov chain Monte Carlo (MCMC) method. The effect of each hardening function on the evolution of the damage parameter, void volume fraction and strain distribution along the gauge length was evaluated throughout the deformation. Also, the onset of instability, geometry of the neck and final fracture were then assessed by comparing the numerical results with experimental data. It is found that the modified JC and Voce-modified JC models can predict the flow behaviour of DP600 more accurately. Additionally, it is shown that the strain hardening rate at large strain levels, as determined by the hardening models, has a considerable effect on the strain map along the specimen, onset of void growth, and progression of damage in the localized area. Highlights Non-linear regression combined with Markov chain Monte Carlo method is utilized. A combination of Voce-modified JC can predict hardening behavior of DP600 accurately. Rousselier model is calibrated to simulate uniaxial tension at different strain-rates. The onset of rapid void growth depends on the hardening rate at large strains. The predicted geometry of the fracture surface is dependent on the hardening function. Graphical Abstract [DISPLAY OMISSION]

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  2. [해외논문]   Fabrication of self-cleaning super-hydrophobic nickel/graphene hybrid film with improved corrosion resistance on mild steel   SCIE

    Ding, Shibing (Corresponding author.) , Xiang, Tengfei , Li, Cheng , Zheng, Shunli , Wang, Jing , Zhang, Manxin , Dong, Chundong , Chan, Wenming
    Materials & Design v.117 ,pp. 280 - 288 , 2017 , 0264-1275 ,

    초록

    Abstract A self-cleaning super-hydrophobic nickel/graphene hybrid film with hierarchical structure was successfully fabricated on mild steel (MS) by electro-deposition process followed by myristic acid modification. The surface morphology and composition were characterized by a field emission scanning electron microscope (FESEM) and attached energy dispersive X-ray spectrum (EDS). The results showed that the hierarchical nickel/graphene film was well formed with random pinecone-like nano-protrusions nickel array on every micro-graphene-protrusion. The super-hydrophobic surface exhibited excellent super-hydrophobicity with a static water contact angle (CA) as high as 160.4±1.5° and a sliding angle (SA) as low as 4.0±0.9°. The super-hydrophobic surface showed excellent anticorrosion performance, mechanical durability and long-term stability in 3.5wt.% NaCl solution, which were characterized by electrochemical impedance spectroscopy (EIS), sandpaper abrasion and immersion tests. In addition, the super-hydrophobic surface also exhibited good self-cleaning performance. Highlights The nickel/graphene hybrid super-hydrophobic film are successfully fabricated by electrochemical-deposition method. The addition of graphene sheets with nano-nickel-cones array on them are homogeneous distribution. The super-hydrophobic film exhibits excellent corrosion resistance, mechanical durability and self-cleaning performance. Relationship of process, microstructures and super-hydrophobic property is established. Graphical abstract The nickel/graphene hybrid super-hydrophobic surface was successfully fabricated on mild steel via electro-deposition method and afterward modified by myristic acid. The result showed that the hierarchical nickel/graphene film was well formed with random nano-nickel-cones array on every micro-graphene-protrusion. [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  3. [해외논문]   A new titanium matrix composite reinforced with Ti-36Nb-2Ta-3Zr-0.35O wire   SCIE

    Zhang, Wei-dong (State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China ) , Liu, Yong (State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China ) , Liu, Bin (State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China ) , Li, Xiao-feng (College of Materials Science and Engineering, North University of China, Taiyuan, Shanxi 030051, China ) , Wu, Hong (State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China ) , Qiu, Jing-wen (College of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China)
    Materials & Design v.117 ,pp. 289 - 297 , 2017 , 0264-1275 ,

    초록

    Abstract Pure Ti shows promising performance for biomedical applications, but its strength needs to be greatly improved. In this work, Ti-36Nb-2Ta-3Zr-0.35O (TNTZO) (wt.%) wire was added to reinforce titanium to prepare titanium matrix composites (TMC) through Spark Plasma Sintering (SPS). The effects of the sintering temperature on microstructures and mechanical properties were investigated. The results showed that with the increasing of the sintering temperature from 800 to 1100°C, the diffusion thickness between the matrix and the wires increases from 5 to 200μm. α' phase was observed in the diffusion layer at 1000 and 1100°C. Both the volume fraction and the lamellar thickness of α' phase increase with the sintering temperature increasing. The mechanical properties of the TMC were significantly improved by the addition of TNTZO wire, especially tensile strength. The TMC sintered at 900°C shows a tensile strength as high as 768MPa and good ductility (12.4%). Mechanical properties are also correlated with the microstructure of the matrix and the phase constitutions in the diffusion layer. Highlights A new titanium matrix composite (TMC) reinforced with TNTZO wire was prepared by Spark Plasma Sintering. α' phase was observed in the diffusion layer at 1000 and 1100°C. The mechanical properties of the TMC were significantly improved by the addition of TNTZO wire. The TMC sintered at 900°C shows a tensile strength as high as 768MPa and good ductility (12.4%). Graphical abstract [DISPLAY OMISSION]

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  4. [해외논문]   Preparation of poly(ε-caprolactone) microspheres and fibers with controllable surface morphology   SCIE

    Huang, Xuewu (College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China ) , Gao, Jiefeng (College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China ) , Li, Wan (Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China ) , Xue, Huaiguo (College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China ) , Li, Robert K.Y. (Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China ) , Mai, Yiu-Wing (Centre for Advanced Materials Technology (CAMT) School of Aerospace, Mechanical and Mechatronic Engineering J07, The University of Sydney, Sydney, NSW 2006, Australia)
    Materials & Design v.117 ,pp. 298 - 304 , 2017 , 0264-1275 ,

    초록

    Abstract Poly(ε-caprolactone) (PCL) microspheres with different surface architectures were prepared by electro-spraying a solution containing polymer, host solvent and guest solvent. With increasing polymer concentration, PCL gradually turned from collapsed particles to regular uniform microspheres and finally to fibers. Non-solvent induced phase separation was responsible for formation of surface pores, and the pore density on the microsphere surface could be varied by selecting different guest solvent or by changing the amount of the non-solvent. The surface morphology of electrospun fibers could be tuned from smooth to rough and porous by varying the weight ratio between non-solvent and polymer that controlled the coalescence of the non-solvent nuclei. Highlights Porous PCL microspheres and fibers were prepared. Non-solvent induced phase separation was responsible for the pore formation. Controllable surface morphology of PCL microspheres and fibers could be achieved. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  5. [해외논문]   Laser diode area melting for high speed additive manufacturing of metallic components   SCIE

    Zavala-Arredondo, Miguel (Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK ) , Boone, Nicholas (Department of Electronic & Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK ) , Willmott, Jon (Department of Electronic & Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK ) , Childs, David T.D. (Department of Electronic & Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK ) , Ivanov, Pavlo (Department of Electronic & Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK ) , Groom, Kristian M. (Department of Electronic & Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK ) , Mumtaz, Kamran (Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK)
    Materials & Design v.117 ,pp. 305 - 315 , 2017 , 0264-1275 ,

    초록

    Abstract Additive manufacturing processes have been developed to a stage where they can now be routinely used to manufacture net-shape high-value components. Selective Laser Melting (SLM) comprises of either a single or multiple deflected high energy fibre laser source(s) to raster scan, melt and fuse layers of metallic powdered feedstock. However this deflected laser raster scanning methodology is high cost, energy inefficient and encounters significant limitations on output productivity due to the rate of feedstock melting. This work details the development of a new additive manufacturing process known as Diode Area Melting (DAM). This process utilises customised architectural arrays of low power laser diode emitters for high speed parallel processing of metallic feedstock. Individually addressable diode emitters are used to selectively melt feedstock from a pre-laid powder bed. The laser diodes operate at shorter laser wavelengths (808nm) than conventional SLM fibre lasers (1064nm) theoretically enabling more efficient energy absorption for specific materials. The melting capabilities of the DAM process were tested for low melting point eutectic BiZn2.7 elemental powders and higher temperature pre-alloyed 17-4 stainless steel powder. The process was shown to be capable of fabricating controllable geometric features with evidence of complete melting and fusion between multiple powder layers. Highlights A novel highly scalable multi-laser powder bed additive manufacturing approach for processing metallic alloys. Near full melting of stainless steel alloy powder (99.7% density) using customised low power diode emitters (2.63W). Increased laser absorption and reduced laser power requirement through use of shorter laser wavelength. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   The limitations of electrical resistance for accurate positioning of shape-memory actuators: The case of well-oriented CuZnAl single-crystals under uniaxial loading   SCIE

    Bertolino, G. (Corresponding author at: Centro Atómico Bariloche, CNEA, R8402AGP San Carlos de Bariloche, Argentina.) , Yawny, A. , Pelegrina, J.L.
    Materials & Design v.117 ,pp. 316 - 325 , 2017 , 0264-1275 ,

    초록

    Abstract The possibility of using the electrical resistance as a feedback signal for precise positioning in the design of compact shape-memory actuators was revised. The analysis was performed on well-oriented CuZnAl single crystalline shape-memory alloys subjected to uniaxial tensile loadings, combining direct strain measurements determined with an extensometer and the four-lead electrical resistance technique. In that way the relationship between strain and electrical resistance could be evaluated by formulating a physics based model that can be easily contrasted with the experimental characterization of a simple benchmark system. It was found that the model here developed provides general guidelines for the selection of a shape-memory material for positioning actuators and that the correlation between strain and electrical resistance is of rather limited precision, even for the simplest material case and loading condition analyzed. The effects of temperature, deformation rate, temperature dependence of the electrical resistivity of austenite and martensite phases and temperature dependence of the strain associated with the stress induced transformation were carefully characterized. Results suggest that the direct use of feedback from electrical resistance measurements for precise positioning is arguable unless materials with low hysteresis and low latent heat of transformation are used in combination with quasi-static operating conditions. Highlights The use of electrical resistance as a feedback signal for positioning of shape memory based actuators is critically revised. A physics-based model relating electrical resistance variation with strain for a single crystal benchmark case is presented. Even in the simplest case, a straightforward accurate correlation between strain and electrical resistance does not exist. Guidelines for selection of a shape memory material for actuator positioned through the electrical resistance are formulated. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   A nanocomposite structure in directly cast NdFeB based alloy with low Nd content for potential anisotropic permanent magnets   SCIE

    Zhao, L.Z. (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China ) , Zhou, Q. (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China ) , Zhang, J.S. (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China ) , Jiao, D.L. (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China ) , Liu, Z.W. (School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China ) , Greneche, J.M. (Institut des Molécules et Matériaux du Mans CNRS UMR-6283, Université)
    Materials & Design v.117 ,pp. 326 - 331 , 2017 , 0264-1275 ,

    초록

    Abstract The magnetic properties of NdFeB magnets can be tailored with different kinds of microstructures. In this work, a nanocomposite structure with amorphous phase remaining inside the micro-sized Nd 2 Fe 14 B type grains was observed by Scanning and Transmission Electron Microscopy on the suction cast Nd 11 Fe 60 Co 10 Ti 2.5 Nb 0.5 C 0.5 B 15.5 alloy, and then confirmed by various characterization techniques. The worm-like soft magnetic amorphous phases show strong exchange coupling with Nd 2 Fe 14 B phase. As a result, the open recoil loops, which are typical characteristics for nanocomposite alloys consisting of hard and soft magnetic phases, have been clearly evidenced. Thus, the formation of this structure may provide an alternative approach to design and fabricate anisotropic nanocomposite NdFeB-based permanent magnets with enhanced magnetic properties. Highlights A moth-eaten like structure with amorphous phase remaining inside the micro-sized Nd 2 Fe 14 B type grains was observed. The abnormal openness of the recoil loops in the high demagnetization was observed. It may provide an alternative approach to design and fabricate anisotropic nanocomposite NdFeB-based permanent magnets. Graphical abstract A moth-eaten like structure with amorphous phase remaining inside the micro-sized Nd 2 Fe 14 B type grains was found in the NdFeB-based alloy prepared by suction casting. The worm-like soft magnetic amorphous phases show strong exchange coupling with Nd 2 Fe 14 B phase. This novel anisotropic nanocomposite structure causes the openness of the recoil loops. The formation of this new structure may provide an alternative approach to design anisotropic nanocomposite NdFeB-based permanent magnets with enhanced magnetic properties. [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [해외논문]   Design of NiAl2O4 cellular monoliths for catalytic applications   SCIE

    Vitorino, Nuno M.D. (CICECO –) , Kovalevsky, Andrei V. (Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal ) , Ferro, Marta C. (CICECO –) , Abrantes, Joã (Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal ) , o C.C. (CICECO –) , Frade, Jorge R. (Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal )
    Materials & Design v.117 ,pp. 332 - 337 , 2017 , 0264-1275 ,

    초록

    Abstract This work focuses on designing highly-porous cellular NiAl 2 O 4 -based spinel ceramics through combined suspension emulsification/reactive sintering and further decoration of the pore surfaces by Ni nanoparticles for potential applications in heterogeneous catalysis. Due to kinetic limitations and specific porous structure, the reduction occurs without affecting the integrity of the cellular monoliths. The reaction mechanism, assessed by XRD and TEM/EDS, includes both partial decomposition and reduction, resulting in the formation of metastable Al-enriched phases, mainly NiAl 32 O 49 , and metallic Ni phase, respectively. The results suggest that the cellular bulk framework can be decorated with Ni catalyst in a controlled way, by proper selection of the initial cation stoichiometry of the NiAl 2 O 4 spinel and appropriate reduction conditions. In selected conditions the reduction results in Ni nanoparticles of various dimension scales, finely dispersed at the pore surfaces, with a significant fraction below 50nm, as confirmed by TEM/EDS. The results of thermodynamic analysis emphasize that the redox tolerance of the spinel phase is dependent on the Ni:Al activity ratio, suggesting the prospects for tuning the catalytic activity and stability by designing the initial composition and resulting content of metallic Ni and Ni- and Al-containing metastable phases. Highlights Cellular spinel-based monoliths were prepared by suspension emulsification, reactive sintering and reduction. Flexible design of NiAl 2 O 4 -based catalysts in terms of redox stability and catalytic activity. New guidelines for controlled modification of the porous ceramic framework with nanostructured Ni are proposed. Graphical abstract [DISPLAY OMISSION]

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   Design and microstructure analysis of globules in Al-Co-La-Pb immiscible alloys with an amorphous phase   SCIE

    Nagase, Takeshi (Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan ) , Takemura, Mamoru (Technology Research Institute of Osaka Prefecture, 2-7-1, Ayumino, Izumi, Osaka 594-1157, Japan ) , Matsumuro, Mitsuaki (Technology Research Institute of Osaka Prefecture, 2-7-1, Ayumino, Izumi, Osaka 594-1157, Japan ) , Matsumoto, Megumi (Center for Supports to Research and Education Activities, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan ) , Fujii, Yoshikazu (Center for Supports to Research and Education Activities, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan)
    Materials & Design v.117 ,pp. 338 - 345 , 2017 , 0264-1275 ,

    초록

    Abstract An immiscible alloy with an amorphous phase, Al-Co-La-Pb, was designed by the combination of empirical rules, prediction of phase diagrams based on ab initio calculations, and thermodynamic calculations. The solidification microstructure of rapidly solidified Al-Co-La-Pb melt-spun ribbons was investigated. Liquid-phase separation and the formation of an amorphous phase occurred simultaneously in the Al-Co-La-Pb alloy, resulting in the formation of Pb globules embedded in the Al-Co-La–based amorphous matrix. The particle size distribution of the globules and the formation of Pb nanoglobules were explained by the multistep liquid-phase separation. STEM observation clarified the microstructure of oxygen-enriched globules with double shell layers in the Al-Co-La-Pb alloy. Highlights An immiscible Al-Co-La-Pb alloy with an amorphous phase was designed. Ultra-fine Pb globules, dispersed in Al-based amorphous alloys, were successfully obtained. Multistep liquid-phase separation occurred in Al-Pb–based immiscible alloys. STEM clarified the particle structures in Pb-enriched and oxide globules Graphical abstract [DISPLAY OMISSION]

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  10. [해외논문]   Hydrothermal topological synthesis and photocatalyst performance of orthorhombic Nb2O5 rectangle nanosheet crystals with dominantly exposed (010) facet   SCIE

    Wen, Puhong (Corresponding author.) , Ai, Lili , Liu, Taotao , Hu, Dengwei , Yao, Fangyi
    Materials & Design v.117 ,pp. 346 - 352 , 2017 , 0264-1275 ,

    초록

    Abstract The regular orthorhombic Nb 2 O 5 (O-Nb 2 O 5 ) rectangle nanosheets dominantly exposed (010) facet are synthesized by a hydrothermal topological reaction with a precursor of K 4 Nb 6 O 17 ·4.5H 2 O (KNbO). The structure and morphology of the samples obtained at different temperatures and pH values of reacting solution are investigated. The results suggest that there are two topological reactions in this process. One is the acid-exchanging reaction transforming into H 4 Nb 6 O 17 ·3H 2 O (HNbO) nanosheets from KNbO rectangle nanosheets, and the other is dehydration reaction transforming into O-Nb 2 O 5 rectangle nanosheets from HNbO nanosheets. And the {010} facets of O-Nb 2 O 5 crystal are transformed from the {010} facets of HNbO crystal in the ingenious topological reaction. The photoelectric performance of the obtained O-Nb 2 O 5 nanosheets is evaluated by decomposing water to H 2 under 370nm UV light illumination and measuring the accompanying photocurrent. The photocurrent density is 680nA·cm −2 generated by splitting water with O-Nb 2 O 5 nanosheets as photocatalyst, and it is 4.3 times of the contrast sample. The result indicates that the (010) facet of O-Nb 2 O 5 is one of the highest photocatalytic active surfaces and shows high photoelectric conversion efficiency. Thus, the O-Nb 2 O 5 nanosheets dominantly exposed (010) facet have potential applications in photocatalyst and photoelectric nanodevices. Highlights The orthorhombic Nb 2 O 5 rectangle nanosheets are synthesized by hydrothermal topological reaction. The orthorhombic Nb 2 O 5 rectangle nanosheet crystals dominantly exposed (010) facet show high UV photocatalytic activity and photoelectric conversion efficiency. The evolution mechanism of crystal structure of orthorhombic Nb 2 O 5 rectangle nanosheets from the layered K 4 Nb 6 O 17 ∙4.5H 2 O precursor is proposed. Graphical abstract [DISPLAY OMISSION]

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