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NUMERICAL ENERGY DISSIPATION FOR TIME-FRACTIONAL PHASE-FIELD EQUATIONS

Journal of Computational Mathematics 2025年第3期43卷 515-539页

作者： Chaoyu Quan Tao Tang Jiang Yang School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China Division of Science and Technology BNU-HKBU United International CollegeZhuhai 519087China Guangdong Provincial Key Laboratory of Interdisciplinary Research and Application for Data Science BNU-HKBU United International CollegeZhuhai 519087China Department of Mathematics SUSTech International Center for Mathematics&National Center for Applied Mathematics Shenzhen(NCAMS)Southern University of Science and TechnologyShenzhen 518055China

The numerical integration of phase-field equations is a delicate task which needs to recover at the discrete level intrinsic properties of the solution such as energy dissipation and maximum *** the theory of energy dissipation for classical phase field models is well established,the corresponding theory for time-fractional phase-field models is still *** this article,we study certain nonlocal-in-time energies using the first-order stabilized semi-implicit L1 *** particular,we will establish a discrete fractional energy law and a discrete weighted energy *** extension for a(2-α)-order L1 scalar auxiliary variable scheme will be ***,we demonstrate that the energy bound is preserved for the L1 schemes with nonuniform time *** numerical experiments are carried to verify our theoretical analysis.

关键词： Time-fractional phased-field equation Allen-Cahn equations Cahn-Hilliard equations Caputo fractional derivative Energy dissipation

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Boring holes in Au nanoplates by active surface etching

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Nano research 2024年第9期17卷 8610-8617页

作者： Haiyang Hu Yuntao Wang Qian Wang Xudong Peng An Su Hong Wang Hongyu Chen Institute of Advanced Synthesis(IAS)and School of Chemistry and Molecular Engineering Jiangsu National Synergetic Innovation Centre for Advanced MaterialsNanjing Tech UniversityNanjing 211816China Department of Environmental Science and Engineering University of Science and Technology of ChinaHefei 230026China Department of Chemistry School of Science and Key Laboratory for Quantum Materials of Zhejiang ProvinceResearch Center for Industries of the FutureWestlake UniversityHangzhou 310030China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China

In contrast to the conventional etching that makes nanoparticles rounder and our previous sharpening etching mode that causes serrated edges,here,we developed a new boring etching mode that targets the faces of Au nanoplates to make *** critical factors are the pre-incubation step with the ligand 2-mercapto-5-benzimidazolecarboxylic acid(MBIA)and the subsequent removal of excess ligands in the ***,etching is focused onto the few sites with initial loss of ligands,which cannot be quickly *** choice of ligand MBIA is also of importance,as it carries negative charge and repels each *** inability of forming a dense layer probably plays a critical role in the site-selectivity for faces,because ligands at the higher curvature edges and corners are expected to have less *** etching results from the comproportionation reaction between Au3+and Au0 in the nanoplates,where Br-coordination to Au and the extra stabilization from cetyltrimethylammonium bromide(CTAB)are *** believe that the ability of boring holes is an important tool for future synthetic designs.

关键词： Au nanoplates active surface etching boring etching mode cetyltrimethylammonium bromide(CTAB)passivation holes

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Field-induced reversible assembly of one-dimensional colloids

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science Bulletin 2025年第9期70卷 1371-1374页

作者： Tian, Siyuan Chen, Xinman Cheng, Hui-Ming Ding, Baofu Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China Guangdong Engineering Research Center of Optoelectronic Functional Materials and Devices School of Semiconductor Science and Technology South China Normal University Foshan528225 China Faculty of Materials Science and Energy Engineering Shenzhen University of Advanced Technology Shenzhen518055 China

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Synthesis of stable iodoplumbate and perovskite for efficient annealing-free device and long-term storage

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SusMat 2023年第6期3卷 821-833页

作者： Jihyun Kim Sang-Won Park Younghyun Lee Hideo Hosono Byungwoo Park Jinhyun Kim Department of Chemical and Materials Engineering University of SuwonHwaseongSouth Korea MDX Research Center for Element Strategy International Research Frontiers InitiativeTokyo Institute of TechnologyYokohamaJapan Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyDaejeonSouth Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulSouth Korea

As a next-generation photovoltaic device,perovskite solar cells are rapidly ***,both solution and device stability pose challenges for commercialization due to chemical degradation caused by internal and external ***,the decomposition of iodoplumbate in a perovskite solution hinders the long-term use of perovskite ***,the synthesis of stable perovskites at low temperature is important for stable devices and wide applications(flexible devices and high reproducibility).Herein,the critical composition of perovskite is found to obtain high stabilities of both iodoplumbate and perovskite crystals by utilizing CsPbBr_(3) and FAPbI_(3),exhibiting high device performance and long-term solution *** novel composition of CsPbBr_(3)-alloyed FAPbI_(3) not only crystallizes under annealing-free conditions but also demonstrates excellent iodoplumbate stability for 100 days(∼3000 h)without any ***,high device stabilities are achieved over 2000 and 3000 h under extreme conditions of A.M.1.5 and 85℃/85%relative humidity,***,the device exhibited a high power conversion efficiency of 23.4%,and furthermore,CsPbBr_(3)-alloyed FAPbI_(3) was devoted to widen the applications in both flexible and carbon-electrode devices,thereby addressing both scientific depths and potential commercial materials.

关键词： annealing free DFT calculation iodoplumbate long-term stability perovskite solar cells

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Remarkably high fracture toughness of HfNbTaTiZr refractory high-entropy alloy

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Journal of Materials science & technology 2022年第28期123卷 70-77页

作者： X.J.Fan R.T.Qu Z.F.Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215132China

High-entropy alloys(HEAs)with face-centered cubic(FCC)phase such as CoCrFeMnNi or CoCrNi generally exhibit ultra-high fracture toughness but relatively low *** contrast,body-centered cubic(BCC)HEAs often display higher strengths,but the few reports on fracture toughness measurement demonstrate low toughness *** we show that the BCC HfNbTaTiZr refractory HEA,which possesses a combination of high strength,good tensile ductility and excellent high-temperature properties,also exhibits a remarkably high fracture *** using the"single specimen"compliance method for J-integral measurement according to the ASTM E1820–17 standard,its fracture toughness K_(JIC)was experimentally determined to be 210 MPa m^(1/2),which renders this HEA among the toughest metallic *** excellent damage tolerance makes the HEA promising for applications as high-temperature structural materials such as in aerospace field.

关键词： High-entropy alloys BCC structure Fracture toughness J-integral

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Design and Fabrication of Viscoelastic Hydrogels as Extracellular Matrix Mimicry for Cell Engineering

Chem and Bio Engineering

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Chem and Bio Engineering 2024年第11期1卷 916-933页

作者： Li, Zi-Yuan Li, Tian-Yue Yang, Hao-Chen Ding, Mu-Hua Chen, Lin-Jie Yu, Shi-Yun Meng, Xiang-Sen Jin, Jia-Jun Sun, Shi-Zhe Zhang, Junji Tian, He Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry Institute of Fine Chemicals School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai200237 China

The extracellular matrix (ECM) performs both as a static scaffold and as a dynamic, viscoelastic milieu that actively participates in cell signaling and mechanical feedback loops. Recently, biomaterials with tunable viscoelastic properties have been utilized to mimic the native ECM in the fields of tissue engineering and regenerative medicines. These materials can be designed to support cell attachment, proliferation, and differentiation, facilitating the repair or replacement of damaged tissues. Moreover, viscoelasticity modulation of ECM mimicry helps to develop therapeutic strategies for diseases involving altered mechanical properties of tissues such as fibrosis or cancer. The study of biomaterial viscoelasticity thus intersects with a broad spectrum of biological and medical disciplines, offering insights into fundamental cell biology and practical solutions for improving human health. This review delves into the design and fabrication strategies of viscoelastic hydrogels, focusing particularly on two major viscoelastic parameters, mechanical strength and stress relaxation, and how the hydrogel mechanics influence the interactions between living cells and surrounding microenvironments. Meanwhile, this review discusses current bottlenecks in hydrogel-cell mechanics studies, highlighting the challenges in viscoelastic parameter decoupling, long-term stable maintenance of viscoelastic microenvironment, and the general applicability of testing standards and conversion protocols. © 2024 The Authors. Co-published by Zhejiang University and American Chemical Society.

关键词： Tissue

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Refinement of α′Martensite by Oxygen in Selective Laser Melted Ti-6Al-4V

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 777-792页

作者： Hasfi FNurly Jinhu Zhang Dechun Ren Yusheng Cai Haibin Ji Dongsheng Xu Zhicheng Dong Hao Wang Qingmiao Hu Jiafeng Lei Rui Yang School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials and Chemistry/Interdisciplinary Centre for Additive Manufacturing University of Shanghai for Science and TechnologyShanghai 200093China Centre for Adaptive System Engineering ShanghaiTech UniversityShanghai 201210China

Oxygen is crucial in influencing the microstructure evolution of selective laser melted(SLMed)Ti–6Al–4V,significantly impacting its applicability in various ***,this study investigates the influnce of oxygen on microstructure evolution,particularlyα′martensite transformation and refinement *** alloys,Ti–6Al–4V–xO(x=0.11,0.16,0.21,and 0.25 wt%),were fabricated by the SLM *** martensite start temperature(M_(s))of Ti–6Al–4V,as evaluated by computation,is 656.8°C,and oxygen was found to increase the M_(s) by about 10°C per 0.1 wt%.The SLMed alloy samples exhibit[001]_(β)growth texture along the build *** analysis of martensite morphology suggests internal twinning on{1011}planes as the lattice invariant strain,which becomes more predominant with increasing oxygen *** of α′martensite plates by oxygen is due to increased lattice distortion,reduced prior β grain size,and oxygen segregation toβgrain *** findings contribute to improving the understanding of the effect of oxygen on the transformation mechanism ofα′martensite during SLM of Ti–6Al–4V.

关键词： Selective laser melting α′Martensite Martensite start temperature Oxygen Ti-6Al-4V

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Understanding secondary phase inclusion and composition variations in the microstructure design of n-type Bi_(2)Te_(3) alloys via selective dissolution of KCl

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Journal of advanced Ceramics 2023年第12期12卷 2360-2370页

作者： Gwang Min Park Seunghyeok Lee Jun-Yun Kang Seung-Hyub Baek Heesuk Kim Jin-Sang Kim Seong Keun Kim KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea Electronic Materials Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Department of Materials Science and Chemical Engineering Hanyang UniversityAnsan 15588Republic of Korea Ferrous Alloy Department Korea Institute of Materials ScienceChangwon 51508Republic of Korea Soft Hybrid Materials Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and TechnologyWanju 55324Republic of Korea

This study investigated the effects of KCl treatment on microstructure and thermoelectric properties of n-type Bi_(2)Te_(2.7)Se_(0.3)(BTS)thermoelectric *** innovative KCl treatment was originally intended to introduce nanopores through selective dissolution of KCl from a mixture of thermoelectric materials and ***,it unexpectedly induced substantial variations in material composition and microstructure during the subsequent spark plasma sintering(SPS)*** groups adsorbed on the powder surface during the dissolution resulted in the emergence of a Bi_(2)TeO_(5) secondary phase within the BTS matrix after the SPS process at 450℃.The concentration of Bi_(2)TeO_(5) increased with an increase in the KCl ***,a remarkable grain growth occurred at low KCl concentrations,likely due to the liquid-phase formation in a Te-rich composition during ***,excessive Bi_(2)TeO_(5) at higher KCl concentrations hindered grain *** variations in the microstructure had complex effects on electrical properties:The TeBi antisite defects increased the electron concentration,and Bi_(2)TeO_(5) reduced electron ***,the lattice thermal conductivity decreased due to the presence of Bi_(2)TeO_(5),from 0.8 W·m^(−1)·K^(−1) at 298 K for the pristine BTS to 0.6 W·m^(−1)·K^(−1) at 298 K for BTS treated with 1 wt%*** insights allowed precise adjustments of the electrical and thermal conductivities,leading to an enhancement in the maximum value of figure-of-merit(ZT)from 0.76 to 0.96 through the selective dissolution of KCl *** believe that our observations potentially enable advances in thermoelectric materials by engineering microstructures.

关键词： thermoelectric materials Bi_(2)Te_(3) Bi_(2)TeO_(5) grain growth n-type KCl

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Plate-Like Flexible Spacecraft Modeling and Distribution of Control Moment Gyroscopes

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Space(science & technology) 2023年第1期3卷 464-477页

作者： Jingyu Guo Chengfei Yue Shiyuan Jia Xibin Cao Research Center of Satellite Technology Harbin Institute of TechnologyHarbinChina Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhenShenzhenChina School of Automation Beijing University of Posts and TelecommunicationsBeijingChina

This study investigates the optimization configuration problem of control moment gyroscopes for flexible vibration suppression of large space ***,the structural dynamic model of an unconstrained plate-like flexible spacecraft with control moment gyroscopes is established using the Lagrangian method and the finite element ***,an optimization problem is established with the positions of control moment gyroscope array as variables and the linear quadratic index of mechanical energy during vibration process as the objective ***,an improved gray wolf optimizer is used to solve the optimization *** optimization results show that the control moment gyroscopes should be primarily placed on the corners of the spacecraft in a symmetrical ***,the priority of control moment gyroscope installation positions was studied using topological *** results indicate that the control moment gyroscopes should be primarily installed on the corners,followed by the central positions,and then gradually expanded outward.

关键词： function positions corners

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Unveiling the intrinsic properties of single NiZnFeO_x entity for promoting electrocatalytic oxygen evolution

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Chinese Chemical Letters 2024年第4期35卷 181-186页

作者： Zhihao Gu Jiabo Le Hehe Wei Zehui Sun Mahmoud Elsayed Hafez Wei Ma Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Department of Chemistry Faculty of ScienceBeni-Suef UniversityBeni-Suef 62511Egypt

Although considerable research efforts have been devoted to the design and development of non-noble electrocatalysts for oxygen evolution reaction(OER), substantial enhancement of OER performance with commercial-scale water electrolysis remains a big challenge. This could result from the difficulties in detecting the intrinsic properties and overlooking the assembly process for electrochemical OER process. Here, we employ a microjet collision method to investigate the intrinsic OER activities of individual NiZnFeO_x entities with and without a moderate magnetic field. Our results demonstrate that single NiZnFeO_x nanoparticles(NPs) show the excellent OER performance with a lowest onset potential(~1.35 V vs. RHE) and a greatest magnetic enhancement(~118%) among bulk materials, single agglomerations and NPs. Furthermore, we explore the utility of theoretical investigation by density functional theory(DFT)calculations for studying OER process on NiZnFeO_x surfaces without and with spin alignment, indicating monodispersed NiZnFeO_xNPs with totally spin alignment facilitates the OER process under the external magnetic field. It is found that the well-dispersion of NiZnFeO_x NPs would increase the electrical conductivity and the surface spin state, resulting in promoting their OER activities. This work provides a test for uncovering the essential roles of NPs assembly to a significant promotion of their magnet-assisted OER.

关键词： Single entity OER Magnetic enhancement Electrocatalysis Well-dispersion

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