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A strategy for designing stable nanocrystalline alloys by thermo-kinetic synergy

Journal of Materials Science & Technology 2020年第8期36卷 21-31页

作者： H.R.Peng B.S Liu F.Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China School of Materials and Chemical Engineering Xi’an Technological UniversityXi’an710021China Analytical and Testing Center Northwestern Polytechnical UniversityXi’an710072China

Aiming to design stable nanocrystalline(NC)materials,so far,it has been proposed to construct nanostructure stability maps in terms of thermodynamic parameters,while kinetic stabilization has seldom been considered,despite the synergy of thermodynamics and ***,the thermodynamically stabilized NC materials may be easily subjected to grain growth at high temperatures due to the weakly kinetic *** from the thermo-kinetic synergy,a stabilization criterion is proposed as a function of intrinsic solute parameters(*** activation energy for bulk diffusion and the segregation enthalpy),intrinsic solvent parameters(*** intrinsic activation energy for GB migration and the GB energy)and processing parameters(*** grain size,the temperature and the solute concentration).Using first-principles calculations for a series of combinations between fifty-one substitutional alloying atoms as solute atoms and Fe atom as fixed solvent atom,it is shown that the thermal stability neither simply increases with increasing the segregation enthalpy as expected by thermodynamic stabilization,nor monotonically increases with increasing the activation energy for bulk diffusion as described by kinetic *** combination of thermodynamic and kinetic contributions,the current stabilization criterion evaluates quantitatively the thermal stability,thus permitting convenient comparisons among NC materials involved by various combinations of the solute atoms,the solvent atoms,or the processing *** of this thermo-kinetic stabilization criterion has been tested by current experiment results of Fe-Y alloy and previously published data of Fe-Ni,Fe-Cr,Fe-Zr and Fe-Ag alloys,etc.,which opens a new window for designing NC materials with sufficiently high thermal stability and sufficiently small grain size.

关键词： Thermo-kinetic Synergy Criterion Thermal stability Nanocrystalline materials

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Thermo-Kinetic Synergy and Micro-Alloying Effects of Multiphase Transformations in an As-Cast Al-Mg-Si-Cu Alloy

SSRN

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SSRN 2022年

作者： Jiang, Yan Li, Yusong Liu, Feng State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shanxi Xi’an710072 China Analytical & Testing Center Northwestern Polytechnical University Shanxi Xi’an710072 China

This work explores effects of Ge and Sb on the formation of secondary phases, with an emphasis laid on the thermo-kinetics of phase transformations and mechanisms determining the micro-alloying effects. The results reveal that the dominating microstructures in an Al-Mg-Si-Cu alloy, including Mg 2 Si, Al 4 Cu 2 Mg 8 Si 7 (Q), Si and Al 2 Cu (θ) phases, are thermal activated. Compared to elemental Si, intermetallic compounds like Mg 2 Si and Q phases have larger critical nucleation radius and phase-transformation energy barrier, and the larger thermodynamic driving force and kinetic migration energy barrier generally result in finer microstructures. Micro-alloying affects the phase transformations in two ways: the element Sb not only promotes forming Mg 3 Sb 2 phases but also facilitates the formation of elemental Si, Q needles and θ dispersoids through the mismatch effect;whereas the element Ge facilitates the formation of (Ge, Si) structures with different shapes and crystal structures by a substitution behavior following the formation energy criterion. © 2022, The Authors. All rights reserved.

关键词： Silicon alloys

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Study of microstructure and discharge performance in fine-grained AZ31 magnesium alloy air battery anodes produced via single-pass large strain rolling

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Electrochimica Acta 2025年 528卷

作者： Zhao, Yuchen Jiang, Tao Li, Yong Sun, Yonghui Zhao, Hongyang Xu, Guangming School of Materials and Metallurgy University of Science and Technology Liaoning Anshan114051 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang110819 China Analytical and Testing Center Northeastern University Shenyang110819 China Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education Northeastern University Shenyang110819 China

This study utilized single-pass large strain rolling technology to prepare fine-grained AZ31 magnesium alloy anodes with excellent discharge properties. We systematically examined the microstructural evolution, electrochemical behavior, and discharge characteristics of these materials through EBSD, laser confocal three-dimensional morphology analysis, SEM, electrochemical testing, and constant current discharge experiments. The findings highlighted the interplay between the material's recrystallization and its discharge characteristics, along with the corrosion mechanisms active during discharge. Experimental results showed that increased rolling deformation improved both the degree of recrystallization and the anodes' overall discharge performance. Recrystallized grains that were fine and evenly distributed mitigated the depth of corrosion pits, resulting in a smoother electrolyte interface. This structural alteration reduced the chunk effect, enhancing the stability of the discharge process. Notably, anodes deformed by 80 % demonstrated optimal comprehensive discharge performance. At a discharge current of 20 mA·cm-2, these anodes achieved an efficiency, discharge capacity, and specific energy of 68.88 %, 1538.46 mA h·g-1, and 1764.11 mW h·g-1 respectively, showing an increase of 16.67 %, 16.67 %, and 17.67 % over the base material. Such results confirm the significant benefits of single-pass large strain rolling technology in developing fine-grained magnesium alloy anode materials, offering new avenues for advancing high-performance magnesium-air battery anodes. © 2025 Elsevier Ltd

关键词： Recrystallization (metallurgy)

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Graphene oxide as a photocatalytic nuclease mimicking nanozyme for DNA cleavage

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Nano Research 2020年第2期13卷 455-460页

作者： Jinyi Zhang Shihong Wu Lingzi Ma Peng Wu Juewen Liu Department of Chemistry Waterloo Institute for NanotechnologyWaterlooOntarioN2L 3G1Canada State Key Laboratory of Hydraulics and Mountain River Engineering Analytical&Testing CenterSichuan UniversityChengdu 610064China

Developing nanomaterial-based enzyme mimics for DNA cleavage is an interesting challenge and it has many potential ***-layered graphene oxide(GO)is an excellent platform for DNA *** addition,GO has been employed for photosensitized generation of reactive oxygen species(ROS).Herein,we demonstrate that GO sheets could cleave DNA as anuclease mimicking nanozyme in the presence of UV or blue *** various DNA sequences and lengths,well-defined product bands were observed along with photobleaching of the fluorophore label on the *** from previously reported GO cleavage of DNA,our method did not require metal ions such as Cu^2+.Fluorescence spectroscopy suggested a high adsorption affinity between GO and *** comparison,although zero-dimensional fluorescent carbon dots(C-dots)had higher photosensitivity ir terms of producing ROS,their cleavage activity was much lower and only smeared cleavage products were observed,indicatingthat the ROS acted on the DNA in *** on the results,GO behaved like a classic heterogeneous catalyst following substrate adsorption,reaction,and product desorption *** simple strategy may help in the design of new nanozymes by introducing light.

关键词： graphene oxide photocatalysis nuclease mimicking nanozyme DNA cleavage

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Taxonomic bias in occurrence information of angiosperm species in China

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Science China(Life Sciences) 2021年第4期64卷 584-592页

作者： Wenjing Yang Dandan Liu Qinghui You Bin Chen Minfei Jian Qiwu Hu Mingyang Cong Keping Ma Key Laboratory of Poyang Lake Weland and Watershed Research(Jiangxi Normal Universiy) Minisiry of EducationNanchang 330022 China School of Geography and Environmen Jiangxi Normal UniversiyNanchang 33002China School of Life Sciences Jiangxi Normal UntiversityNanchang 330022 China Department of Informaion Technolog Shanghai Chenshan Botanical GardenShanghai 201602China Analytical&Testing Center Jiangxi Normal UniversiyNanchang 30022 China State Key Laboratory of Vegetation and Envirnmental Change Institute of BotamyChinese Academy of SciencesBejjing 100093China

Taxonomic bias is a well-known shortcoming of species occurrence *** the causes of taxonomic bias facilitates future biological surveys and addresses current knowledge ***,we investigate the main drivers of taxonomic bias in occurrence data of angiosperm species in *** used a database including 5,936,768 records for 28,968 angiosperm species derived from herbarium specimens and literature *** additive models(GAMs)were applied to investigate explanatory powers of 17 variables on the variation in record numbers of *** explanatory variables were selected for a multi-predictor GAM that explained 69%of the variation in record numbers:plant height,range size,elevational range,numbers of scientific publications and web *** size was the most important predictor in the model and positively correlated with number of *** and phenological traits and social-economic factors including economic values and conservation status had weak explanatory powers on record numbers of plant species,which differs from the findings in animals,suggesting that causes of taxonomic bias in occurrence databases may vary between taxonomic *** results suggest that future floristic surveys in China should more focus on range-restricted and socially or scientifically less"interesting"species.

关键词： biodiversity databases conservation status economic values flowering plants narrow-ranging species specimen collection survey effort taxonomic bias

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In- and Ex-Situ Study of Phase Transformation Behavior in the Ternary Ru-Containing Γ-Tial Alloys

SSRN

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SSRN 2022年

作者： Wu, Yulun Hu, Rui Yang, Jieren Song, Lin Gao, Xiangyu Stark, Andreas Liang, Zhida Pyczak, Florian State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'An710072 China School of Materials Science and Engineering Sichuan University Chengdu610065 China Analytical & Testing Center Northwestern Polytechnical University Xi'An710072 China Institute of Materials Physics Helmholtz-Zentrum Hereon Geesthacht21502 Germany

The phase transformation pathways and phase transition temperatures in six Ru-containing γ-TiAl alloys with different Ru and Al contents were determined by means of in-situ synchrotron radiation high energy X-ray diffraction (HEXRD) from 1000 oC to 1420 oC. To validate the HEXRD results, a series of water-quenching experiments after isothermal holding were performed. The results indicate that the phase transformation behavior of Ru-containing γ-TiAl alloys is quite sensitive to Ru and Al content. Ru is one of the strongest β-stabilizers, which increases the α2 disordering temperature. According to the experimental quasi-binary phase diagrams, the β transus temperature is obviously decreased and the single α phase field is moved to the higher Al contents. Moreover, the γ-containing phase field extends to the Al-depleted side in an alloy with 2.0 at.% Ru addition, indicating that Ru is also a kind of γ-stabilizer. In addition, the higher contents of Ru and Al will lead to the precipitation of ternary intermetallic τ1 phase during solid-state phase transformation, but not during solidification as mentioned by previous researches. © 2022, The Authors. All rights reserved.

关键词： Synchrotron radiation

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Osteogenic and antibacterial dual functions of a novel levofloxacin loaded mesoporous silica microspheres/nano-hydroxyapatite/ polyurethane composite scaffold

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Genes & Diseases 2021年第2期8卷 193-202页

作者： Zhiping Kuang Guangming Dai Ruijie Wan Dongli Zhang Chen Zhao Cheng Chen Jidong Li Hongchen Gu Wei Huang Department of Orthopedic Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing400016PR China Department of Orthopaedic Surgery Chongqing Traditional Chinese Medicine HospitalChongqing400011PR China Research Center for Nano-Biomaterials Analytical&Testing CenterSichuan UniversityChengduSichuan Province610065PR China State Key Laboratory of Oncogenes and Related Genes School of Biomedical EngineeringMed-X Research InstituteShanghai Jiaotong UniversityShanghai200240PR China

Lev/MSNs/n-HA/PU has been proved to be a novel scaffold material to treat bone defect caused by chronic *** have previously identified that this material can effectively treat chronic osteomyelitis caused by Staphylococcus aureus in ***,the potential mechanisms of antibacterial and osteogenic induction properties remain ***,for osteogenesis property,immunohistochemistry,PCR,and Western blot were performed to detect the expression of osteogenic ***,flow cytometry and TUNEL were applied to analyze MC3T3-E1 proliferation and *** antibacterial property,the material was co-cultivated with bacteria,bacterial colony forming units was counted and the release time of the effective levofloxacin was assayed by agar disc-diffusion ***,scanning electron microscope was applied to observe adhesion of *** terms of osteogenic induction,we found BMSCs adherently grew more prominently on Lev/MSNs/n-HA/***/MSNs/n-HA/PU also enhanced the expression of osteogenic markers including OCN and COL1a1,as well as effectively promoted the transition from G1 phase to G2 ***,Lev/MSNs/n-HA/PU could reduce apoptosis of ***,both Lev/MSNs/n-HA/PU and n-HA/PU materials could inhibit bacterial colonies,while Lev/MSNs/n-HA/PU possessed a stronger antibacterial activities,and lower bacterial adhesion than n-HA/*** results illustrated that Lev/MSNs/n-HA/PU composite scaffold possess favorable compatibility in vitro,which induce osteogenic differentiation of MSCs,promote proliferation and differentiation of MC3T3-E1,and inhibit ***,clear in vitro antibacterial effect of Lev/MSNs/n-HA/PU was also *** summary,this study replenishes the potential of Lev/MSNs/n-HA/PU composite scaffold possess dual functions of anti-infection and enhanced osteogenesis for future clinical application.

关键词： Antibacterial Composite scaffold Levofloxacin Nanobiomaterial Osteogenesis

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Fusing Thienoisoindigo to the Conjugated Ribbons with Strong Absorption in the Second Near-Infrared Window

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CCS Chemistry 2022年第11期4卷 3497-3504页

作者： Yu Jiang Yaogang Zhang Yunfeng Deng Shaoqiang Dong Bo Li Yuanping Yi Zebing Zeng Hanjiao Chen Hao Luo Yanhou Geng Joint School of National University of Singapore Tianjin UniversityInternational Campus of Tianjin UniversityBinhai New CityFuzhou 350207 School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072 Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190 Institute ofMolecular Aggregation Science Tianjin UniversityTianjin 300072 State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082 Analytical&Testing Center Sichuan UniversityChengdu 610064 School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China(UESTC)Chengdu 610054

Organic dyes with strong absorption in the second near-infrared(NIR-II)window(1000-1700 nm)have multiple ***,the design and synthesis of stable NIR-II absorbing organic dyes are very challenging and constantly defy our synthetic *** this work,we have successfully synthesized a series of soluble and stable fused thienoisoindigo(nThIID)*** absorption maximum(λ_(max))of the ribbons increases from 644 nm of 1ThIID to 1252 nm of ***,nThIIDs with n≥4 all display strong absorption in the NIR-II window with molar extinction coefficients(ε_(max))greater than 105 L mol^(−1)cm^(−1)atλ*** molecules are promising photothermal conversion dyes with photothermal conversion efficiencies of ca.60%under 1064 nm laser irradiation.

关键词： organic dyes second near-infrared window low bandgap thienoisoindigo conjugated molecules

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Partial dislocation slip induced plasticity

Journal of Alloys and Compounds Communications

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Journal of Alloys and Compounds Communications 2024年 1卷

作者： Xiangyu Gao Yan Wang Jie Wang Ying Ding Xiaolin Li Analytical & Testing Center Northwestern Polytechnical University Xi’an Shaanxi 710072 PR China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Xi’an Shaanxi 710072 PR China

Both twinning and transformation can produce a macroscopic strain and cause a significant plastic deformation, which are known as twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP), enhancing the plastic deformability of structural materials dramatically. As far as the authors believe, the underlying origin behind these kinds of plastic deformation should not be the twinning and transformation themselves. By deciphering microstructural origins of the two effects in a kind of interstitial high entropy alloy (iHEA), the slip of partial dislocations causing TWIP and TRIP is analogous to the full dislocation slip governing ductility of materials, determines the plastic deformation.

关键词： Twinning-induced plasticity Transformation-induced plasticity Partial dislocation slip Full dislocation slip Slip-induced plasticity

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Peripheral NV-induced electron transfer to Fe1 single atoms for highly efficient O_(2)activation

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Chinese Journal of Catalysis 2025年第5期72卷 187-198页

作者： Fenli Liu Man Yang Jianglin Duan Zhiyu Yin Mingyang Shi Fuqing Chen Huifeng Xiong Xin Liu Wengang Liu Qixing Xia Shaodong Sun Dan Feng Haifeng Qi Yong Qin Yujing Ren Interdisciplinary Research Center of Biology&Catalysis School of Life SciencesNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048ShaanxiChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT Translational Research HubCardiff UniversityMaindy RoadCardiff CF244HQUK. College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Institute of Culture and Heritage Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina Analytical&Testing Center Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina Chongqing Innovation Center Northwestern Polytechnical UniversityChongqing 401135China Shenzhen Research Institute of Northwestern Polytechnical University Shenzhen 518057GuangdongChina

Catalytic oxidation plays a crucial role in chemical industry,in which the utilization of abundant and environmental-friendly oxygen(O_(2))as oxidant aligns with sustainable development principles in green ***,the intrinsic inertness of ground-state O_(2) molecule poses a long-standing challenge in developing an efficient non-noble metal-based ***,inspired by the electron transfer process in respiratory chain,we engineered long-range N_(V) to mediate Fe_(1) center for O_(2) activation in aerobic *** in/quasi-situ spectroscopic characterizations and control experiments suggest the Fe_(1) site efficiently adsorbs O_(2),and the N_(V) site facilitates electron delocalization to adjacent Fe_(1),providing efficient transformation of O_(2) to reactive oxygen species that boost oxidation reactions *** Fe_(1)--N_(V) single-atom catalyst demonstrates outstanding catalytic performance in aerobic oxidations of alkanes,N-heterocycles,alcohols,and amines under relatively mild *** findings offer a new perspective for designing high-efficiency heterogeneous catalysts in aerobic oxidations,promising various potential applications.

关键词： Single-atom catalyst Peripheral-nitrogen effect Long-range NV Synergistic catalysis Aerobic oxidation

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