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The corrosion behavior of Ti-6Al-3Nb-2Zr-1Mo alloy:Effects of HCl concentration and temperature

Journal of Materials Science & Technology 2021年第15期74卷 143-154页

作者： Baoxian Su Binbin Wang Liangshun Luo Liang Wang Yanqing Su Fuxin Wang Yanjin Xu Baoshuai Han Haiguang Huang Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin.150001China department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing100024China School of Materials Science and Engineering.Kunming University of Science and Technology Kunming650093China Yunnan titanium Industry Co. Ltd.Chuxiong651209China

Investigation about the corrosion behavior of Ti alloys in different ambient environment is of great significance for their practical ***,we systematically investigate the corrosion behavior of a newfound Ti-6 Al-3 Nb-2 Zr-1 Mo(Ti80)alloy in hydrochloric acid(HCl)ranging from 1.37 to 7 M,and temperature ranging from 25 to 55℃,by means of electrochemical measurements,static immersion tests and surface *** manifest that increasing either HCl concentration or temperature can accelerate the corrosion of Ti80 alloy via promoting the breakdown of native protective oxide film and then further facilitating the active dissolution of Ti80 *** to potentiodynamic polarization curves,Ti80 alloy displays a spontaneous passive behavior in 1.37 M HCl at 25℃,compared to a typical active-passive behavior under the other *** indicated by cathodic Tafel slope,the rate determining step for cathodic hydrogen evolution reaction is likely the discharge reaction *** apparent activation energies obtained from corrosion current density and maximum anodic current density for Ti80 alloy in 5 M HCl solution are 62.4 and 55.6 kJ mol-1,respectively,which signifies that the rate determining step in the corrosion process of Ti80 alloy is mainly determined by surface-chemical reaction rather than ***,the electrochemical impedance spectroscopy tests demonstrate that a stable and compact oxide film exists in 1.37 M HCl at 25℃,whereas a porous corrosion product film forms under the other ***,the critical HCl concentration at which Ti80 alloy can maintain passivation at 25℃can be determined as a value between 1.37 and 3 ***,the corroded surface morphology characterization reveals that equiaxedαphase is more susceptible to corrosion compared to intergranularβphase due to a lower content of Nb,Mo,and Zr in the former.

关键词： titanium alloys Electrochemical techniques Weight loss Corrosion behavior

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Orientation Dependence of the Micro-Pillar Compression Strength in an Electron Beam Melted Ti-6Al-4V Alloy

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 476-484页

作者： Jinsen Tian Jiang Ma Ming Yan Zhuo Chen Jun Shen Jing Wu College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen518060China department of Materials Science and Engineering and Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials Southern University of Science and TechnologyShenzhen518055China Aerospace Hiwing(Harbin)titanium Industrial Co. Ltd.Harbin150028China Cryo-EM Center Southern University of Science and TechnologyShenzhen518055China

An α/β two-phase Ti-6Al-4V alloy was fabricated by electron beam melting to obtain a basketweave *** orientation dependence of the mechanical properties of Ti-6Al-4 V alloy was studied by micro-pillar compression and post-mortem transmission electron microscopy *** results indicate that different grains have different mechanical responses,and the possible attributions were *** the orientation effect,due to the limited volumes of micropillars,the size of the a phases,dispersion of the β phases,and the presence of the free dislocation path also affect the mechanical properties of the micropillars to a large *** no direct link was discovered between the mechanical properties and the parent β orientations,this work provided a promising method to further study the anisotropic mechanical behavior in Ti-6Al-4V alloy.

关键词： Electron beam melting(EBM) Ti-6Al-4V Micro-pillar compression Orientation dependence Mechanical properties

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Inorganic hollow mesoporous spheres-based delivery for antimicrobial agents

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Frontiers of Materials Science 2023年第1期17卷 51-68页

作者： Yunping Qiao Yanyang Han Rengui Guan Shiliang Liu Xinling Bi Shanshan Liu Wei Cui Tao Zhang Tao He department of Applied Chemistry School of Chemistry and Chemical EngineeringYantai UniversityClearspring RD 3OthLaishanYantai 264005China Weifang Branch Company Shandong Hl-speed Transportation Construction Group Co.Ltd.Qingzhou 262500China Shandong Jinhai titanium Resources Technology Co. Ltd.Binzhou 256600China

Microorganisms coexist with human beings and have formed a complex relationship with ***,the abnormal spread of pathogens can cause infectious diseases thus demands antibacterial *** available antimicrobials,such as silver ions,antimicrobial peptides and antibiotics,have diverse concerns in chemical stability,biocompatibility,or triggering drug ***“encapsulate-and-deliver”strategy can protect antimicrobials against decomposing,so to avoid large dose release induced resistance and achieve the controlled *** loading capacity,engineering feasibility,and economic viability,inorganic hollow mesoporous spheres(iHMSs)represent one kind of promising and suitable candidates for real-life antimicrobial *** we reviewed the recent research progress of iHMSs-based antimicrobial *** summarized the synthesis of iHMSs and the drug loading method of various antimicrobials,and discussed the future *** prevent and mitigate the spread of an infective disease,multilateral coordination at the national level is ***,developing effective and practicable antimicrobials is the key to enhancing our capability to eliminate pathogenic *** believe that our conclusion will be beneficial for researches on the antimicrobial delivery in both lab and mass production phases.

关键词： antimicrobial inorganic hollow mesoporous sphere encapsulate-and-deliver drug delivery

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Indoor Formaldehyde Removal Techniques through Paints: Review

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Green and Sustainable Chemistry 2024年第1期14卷 1-15页

作者： Prajyot Dhawale Ravindra V. Gadhave department of Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Due to its ability to cause illnesses and discomfort even at low concentrations, formaldehyde pollution of indoor air poses a significant risk to human health. Sources of formaldehyde in indoor environments include textiles, paints, wallpapers, glues, adhesives, varnishes, and lacquers;furniture and wooden products like particleboard, plywood, and medium-density fiberboard that contain formaldehyde-based resins;shoe products;cosmetics;electronic devices;and other consumer goods like paper products and insecticides. According to the World Health Organisation, indoor formaldehyde concentrations shouldn’t exceed 0.1 mg/m3. The methods include membrane separation, plasma, photocatalytic decomposition, physisorption, chemisorption, biological and botanical filtration, and catalytic oxidation. Materials based on metal oxides and supported noble metals work as oxidation catalysts. Consequently, a paint that passively eliminates aldehydes from buildings can be developed by adding absorbents and formaldehyde scavengers to the latex composition. It will be crucial to develop techniques for the careful detection and removal of formaldehyde in the future. Additionally, microbial decomposition is less expensive and produces fewer pollutants. The main goal of future research will be to develop a biological air quality control system that will boost the effectiveness of formaldehyde elimination. The various methods of removing formaldehyde through paints have been reviewed here, including the use of mixed metal oxides, formaldehyde-absorbing emulsions, nano titanium dioxide, catalytic oxidation, and aromatic formaldehyde abating materials that can improve indoor air quality.

关键词： Formaldehyde Absorption Paints Catalytic Oxidation Nanofillers

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Effect of Sputtering Current on Growth and Microstructure for titanium Alloy Coatings onto SiC

Effect of Sputtering Current on Growth and Microstructure fo...

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中国材料大会2012

作者： Hao Huang Mao Wen Minjuan Wang Zhenxi Li Xu Huang Chuan Xie titanium alloys lab.Beijing Institute Of Aeronautical Materials department of Materials Science Jilin university

ISBN: (纸本)9783037856086;3037856084

The influences of sputtering current on deposition rate, composition, microstructure evolution and growth mechanism for titanium alloy coatings onto SiC fibers are explored by surface profiler, auger electron spectrometer, X-ray diffraction, scanning electron microscopy and atomic force microscope. The experimental results show that crystallization take place in all coatings with hexagonal structure （α-Ti）. As sputtering current is increased, deposition rate and Al content increase, and Ti content decreases. Coating growth mode alsotransforms from V-shaped column grains to equiaxed grains as sputtering current increased. The column grains are generally not single grains, and more nano-grains are composed

关键词： Sputtering Current PVD titanium Alloy.

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Size-controlled synthesis and red up-converted luminescence of CeO_(2):Yb^(3+)/Er^(3+) nanospheres

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Journal of Rare Earths 2023年第10期41卷 1487-1493,I0001页

作者： Xiaoqi Zhao Yami Ling Hao Suo Zhiyu Zhang Jiangrui Bai Chongfeng Guo College of Physics and Optoelectronic Technology&Advanced titanium Alloys and Functional Coatings Cooperative Innovation Center Baoji University of Arts and SciencesBaoji721016China State Key Laboratory of Photon-Technology in Western China Energy Institute of Photonics&Photon-TechnologyNorthwest UniversityXi'an710127China

In this work,cubic-phased CeO_(2):18 mol%Yb^(3+)/2 moI%Er^(3+)nanospheres were prepared by coprecipitation method,in which the size of nanosphere was precisely controlled by regulating the amount of coprecipitator *** morphology evolution of CeO_(2):18%Yb3+/2%Er^(3+)samples that vary from nanosphere to nano-flower with extending the reaction time was elaborately investigated via increasing the amount of urea and increasing the reaction *** influence of non-radiative relaxation(NR)processes and surface quenching on up-conversion emission output of CeO_(2):18%Yb^(3+)/2%Er^(3+)was investigated through varying the sizes and environmental *** imaging experiment demonstrates that CeO_(2):18%Yb^(3+)/2%Er^(3+)nanospheres have the potential to act as luminescent imaging reagents in tissue imaging.

关键词： Up-conversion Non-radiative relaxation Morphology evolution Tissue imaging Rare earths

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Understanding the oxidation chemistry of Ti_(3)C_(2)T_(x)(MXene)sheets and their catalytic performances

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Journal of Energy Chemistry 2024年第1期88卷 437-445,I0010页

作者： Suvdanchimeg Sunderiya Selengesuren Suragtkhuu Solongo Purevdorj Tumentsereg Ochirkhuyag Munkhjargal Bat-Erdene Purevlkham Myagmarsereejid Ashley DSlattery Abdulaziz SRBati Joseph GShapter Dorj Odkhuu Sarangerel Davaasambuu Munkhbayar Batmunkh department of Chemistry Division of Natural SciencesSchool of Arts and SciencesNational University of MongoliaUlaanbaatar 14200Mongolia Queensland Micro-and Nanotechnology Centre School of Environment and ScienceGriffith UniversityNathan campusBrisbaneQueensland 4111Australia department of Physics Incheon National UniversityIncheon 22012Republic of Korea Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt LuciaBrisbaneQueensland 4072Australia Adelaide Microscopy The University of AdelaideAdelaideSouth Australia 5005Australia Centre for Organic Photonics&Electronics School of Chemistry and Molecular BiosciencesThe University of QueenslandSt LuciaBrisbaneQueensland 4072Australia

Transition metal carbides and nitrides(MXenes)nanosheets are attractive two-dimensional(2D)materials,but they suffer from oxidation/degradation issues during storage and/or applications due to their sensitivity to water and *** the great research progress,the exact oxidation kinetics of Ti_(3)C_(2)T_(x)(MXene)and their final products after oxidation are not fully ***,we systematically tracked the oxidation process of few-layer Ti_(3)C_(2)T_(x) nanosheets in an aqueous solution at room temperature over several *** also studied the oxidation effects on the electrocatalytic properties of Ti_(3)C_(2)T_(x) for hydrogen evolution reaction and found that the overpotential to achieve a current density of 10 mA cm^(-2)increases from 0.435 to 0.877 V after three weeks of degradation,followed by improvement to stabilized values of around 0.40 V after eight *** results suggest that severely oxidized MXene could be a promising candidate for designing efficient *** to our detailed experimental characterization and theoretical calculations,unlike previous studies,black titanium oxide is formed as the final product in addition to white Ti(IV)oxide and disordered carbons after the complete oxidation of Ti_(3)C_(2)T_(x).This work presents significant advancements in better understanding of 2D Ti_(3)C_(2)T_(x)(MXene)oxidation and enhances the prospects of this material for various applications.

关键词： 2D materials MXene Chemical degradation Catalysis Hydrogen evolution reaction

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Insights into the kinetics–morphology relationship of 1-, 2-, and 3D TiNb_(2)O_(7) anodes for Li-ion storage

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Nano Research 2024年第4期17卷 2770-2780页

作者： Wenlei Xu Yaolin Xu Veronika Grzimek Andrea Martin Thorsten Schultz Patrícia ARusso Yan Lu Norbert Koch Nicola Pinna department of Chemistry IRIS Adlershof and the Center for the Science of Materials BerlinHumboldt-Universität zu BerlinBrook-Taylor-Str.212489 BerlinGermany department of Electrochemical Energy Storage Helmholtz-Zentrum Berlin für Materialien und EnergieHahn-Meitner-Platz 114109 BerlinGermany Institut für Physik and IRIS Adlershof Humboldt-Universität zu BerlinBrook-Taylor-Str.212489 BerlinGermany Joint Research Group of Molecular Systems Helmholtz-Zentrum Berlin für Materialien und Energie12489 BerlinGermany

Understanding the influence of electrode material’s morphology on electrochemical behavior is of great significance for the development of rechargeable batteries,however,such studies are often limited by the inability to precisely control the morphology of electrode ***,nanostructured titanium niobium oxides(TiNb_(2)O_(7))with three different morphologies(one-dimensional(1D),two-dimensional(2D),and three-dimensional(3D))were synthesized via a facile microwave-assisted solvothermal *** influence of the morphological dimension of TiNb_(2)O_(7) as electrode material on the electrochemical performance in Li-ion batteries(LIBs)and the underlying correlation with the electrochemical kinetics were studied in detail.2D TiNb_(2)O_(7)(TNO-2D)shows a superior rate capability and cycling stability,associated with improved kinetics for charge transfer and Li-ion diffusion,compared to the 1D and 3D *** X-ray diffraction measurements reveal the structural stability and crystallographic evolution of TNO-2D upon lithiation and delithiation and correlate the Li-ion diffusion kinetics with the lattice evolution during battery charge and ***,carbon-coated TNO-2D achieves enhanced rate capability(205 mAh·g^(-1) at 50 C)and long-term cycling stability(87%after 1000 cycles at 5 C).This work provides insights into the rational morphology design of electrode materials for accelerated charge transfer and enhanced fast-charging capability,pushing forward the development of electrode materials for high-power rechargeable batteries in future energy storage.

关键词： morphological dimension electrochemical kinetics lithium-ion batteries TiNb_(2)O_(7) structural evolution

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Effect of titanium Dioxide Nanoparticles on Growth and Biomass Accumulation in Lettuce (Lactuca sativa)

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American Journal of Plant Sciences 2024年第1期15卷 1-13页

作者： Channa B. Rajashekar Brenden Armstrong department of Horticulture and Natural Resources Kansas State University Manhattan KS USA

The use of titanium dioxide nanoparticles (nTiO2) is gaining interest in agriculture because of their impact on many aspects of plant growth. The present study examines the effects of nTiO2 (5 nm and 10 nm) applied to seeds and the seedlings as a foliar application on various aspects of growth characteristics and biomass accumulation in lettuce (Lactuca sativa, cv. Grand Rapids). Application of 10 nm nTiO2 to seeds through imbibition resulted in a significant reduction in shoot biomass accumulation while 5 nm nTiO2 did not affect the biomass accumulation in lettuce. The application of 10 nm nTiO2 reduced the fresh shoot biomass accumulation by about 18% compared to the control plants. Other growth characteristics such as shoot dry biomass, root fresh and dry biomass, plant height, and leaf area were not affected by the application of both 5 nm and 10 nm nTiO2. In addition, foliar application of these nanoparticles to the lettuce seedlings did not have a significant effect on most of the growth parameters examined, and the increasing concentration ranging from 5 nm/L to 400 mg/L did not produce a consistent response in lettuce. Thus, nTiO2 application to lettuce seeds had a notable negative impact on shoot growth while foliar application did not have a significant effect on many plant growth characteristics. However, foliar applications produced some symptoms of toxicity to the foliage in the form of necrotic or chlorotic patches on the leaves, which were more pronounced with increasing concentrations of both 5 nm and 10 nm nTiO2. However, these symptoms were apparent at a concentration as low as 50 mg/L of nTiO2. Thus, foliar application of nTiO2 may not have a significant impact on many of the growth characteristics in lettuce, but it can result in foliar toxicity.

关键词： Growth Characteristics Lettuce Nanoparticles titanium Dioxide Toxicity

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Improving electrochemical properties of carbon paper as negative electrode for vanadium redox battery by anodic oxidation

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Journal of Central South University 2019年第6期26卷 1435-1442页

作者： HOU Bing-xue CUI Xu-mei ZHANG Qi CHEN Yun-gui department of Advanced Energy Materials College of Materials Science and EngineeringSichuan UniversityChengdu 610065China College of Vanadium and titanium Panzhihua UniversityPanzhihua 617000China School of Intelligent Manufacturing Panzhihua UniversityPanzhihua 617000China

Anodic oxidation with different electrolyte was employed to improve the electrochemical properties of carbon paper as negative electrode for vanadium redox battery(VRB).The treated carbon paper exhibits enhanced electrochemical activity for V^2+/V^3+redox *** sample(CP-NH3)treated in NH3 solution demonstrates superior performance in comparison with the sample(CP-NaOH)treated in NaOH solution.X-ray photoelectron spectroscopy results show that oxygen-and nitrogen-containing functional groups have been introduced on CP-NH3 surface by the treatment,and Raman spectra confirm the increased surface defect of *** storage performance of cell was evaluated by charge/discharge measurement by using *** of CP-NH3 can greatly improve the cell performance with energy efficiency increase of 4.8%at 60 mA/cm^*** excellent performance of CP-NH3 mainly results from introduction of functional groups as active sites and improved wetting *** work reveals that anodic oxidation is a clean,simple,and efficient method for boosting the performance of carbon paper as negative electrode for VRB.

关键词： vanadium redox battery carbon paper negative electrode anodic oxidation electrochemical kinetics

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