检索结果-南通市图书馆

Microwave excited hyperthermy and catalysis of heterostructured Au/Cu–BTA for effective bacteria killing by accelerating charge separation

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第10期43卷 5186-5201页

作者： Wen-Jing Zhang Li-Guo Jin Shui-Lin Wu Chao-feng Wang yu-feng zheng Zhao-Yang Li Zhen-Duo Cui Hui Jiang Sheng-Li Zhu Xiang-Mei Liu School of Materials Science and Engineering the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of ChinaTianjin UniversityTianjin 300072China Biomedical Materials Engineering Research Center Hubei Key Laboratory of Polymer MaterialsMinistry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhan 430062China School of Materials Science and Engineering Peking UniversityBeijing 100871China School of Health Science and Biomedical Engineering Hebei University of TechnologyTianjin 300401China

Deep tissue infections caused by pathogenic bacteria seriously threat the lives of *** this study a smart heterostructured Au/Cu-BTA(BTA=1,2,4,5-benzenetetramine)with microwave(MW)response is synthesized via NaBH_(4)reduction of HAuCl_(4)on the ***/Cu-BTA exhibits excellent hyperthermy and dynamics under MW *** MW thermal mechanism of Au/Cu-BTA is attributed to the excellen dielectric loss and polarization of the heterogeneous ***,the surface energy levels of the Cu-BTA interface alleviate the difficulty of electron hopping through multistage ***,MW can excite Cu-BTA to produce free ***,Au nanoparticles rapidly increase electron transfer and inhibit electron-hole ***,the yields of reactive oxygen species can be enhanced for MW dynamic therapy Consequently,under 10 min of MW irradiation,Au/Cu-BTA killed 99.998%±0.001% of Gram-positive Staphylococcus aureus,99.966%±0.014% of methicillin-resistant Staphylococcus aureus,and 96.871%±0.831% of Gram-negative Pseudomonas *** effective MW bacteria-killing strategy designed in this study shows significant potential for application in the MW-responsive treatment of deep tissue infections without antibiotics.

关键词： Microwave therapy Antibacterial Antiinfection

Comparison of microstructure,mechanical property,and degradation rate of Mg-1Li-1Ca and Mg-4Li-1Ca alloys

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2023年第8期26卷 279-291页

作者： Li-Xin Long Fen-Fen Chen Lan-yue Cui Ze-Song Wei Hai-Tao Wang Rong-Chang Zeng yu-feng zheng College of Materials Science and Engineering Shandong University of Science and TechnologyQingdao266590China Institute of Corrosion Science and Technology Guangzhou510530China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450002China School of Materials Science and Engineering Peking UniversityBeijing100871China International Research Organization for Advanced Science and Technology(IROAST) Kumamoto University2-39-2 Kumamoto860-8555Japan

Mg-1 wt.%Li-1 wt.%Ca(LX11)and Mg-4 wt.%Li-1 wt.%Ca(LX41)alloys share the same hexagonal closed-packed crystalline ***,the differences in microstructure,mechanical properties,and degradation rates between the two alloys are not well ***,the above three aspects of LX11 and LX41 alloys were studied via optical microscopy,tensile tests,and electrochemical polarization and electrochemical impedance spectroscopy,together with hydrogen *** concentration of the released Mg^(2+),Ca^(2+),and Li+ions was analyzed using a flame atomic absorption *** demonstrated that the LX11 alloy was composed of finerα-Mg grains,fewer twins,and smaller volume fractions of the intermetallic phases Mg_(2)Ca than the LX41 *** increasing Li concentration generated a weak decrease in the yield strength of the Mg-Li-Ca alloys,a remarkable increase in elongation to failure,and a stable ultimate tensile *** LX11 alloy had better corrosion resistance than the LX41 *** release rate of the cations(Mg^(2+),Ca^(2+),and Li+)varied significantly with *** release rate of metallic ions in Hank’s solution cannot reflect the true corrosion rate of Mg-Li-Ca alloys due to the formation of the precipitated corrosion products and their difference in *** dealloying corrosion mechanism of the Mg_(2)Ca phase in Mg-Li-Ca alloys was proposed.

关键词： Magnesium alloys Dealloying Intermetallic compound Biomaterial Ionic release

Biodegradation behavior of micro-arc oxidation coating on magnesium alloy-from a protein perspective

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2020年第2期5卷 398-409页

作者： Zhao-Qi Zhang Li Wang Mei-Qi Zeng Rong-Chang Zeng M.Bobby Kannan Cun-Guo Lin yu-feng zheng Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao266590China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao266101China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450002China Biomaterials and Engineering Materials(BEM)Laboratory College of ScienceTechnology and EngineeringJames Cook UniversityTownsville4811Australia State Key Laboratory for Turbulence and Complex Systems and Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China

Protein exerts a critical influence on the degradation behavior of absorbable magnesium(Mg)-based ***,the interaction mechanism between protein and a micro-arc oxidation(MAO)coating on Mg alloys remains ***,a MAO coating was fabricated on AZ31 Mg *** its degradation behavior in phosphate buffer saline(PBS)containing bovine serum albumin(BSA)was investigated and compared with that of the uncoated *** morphologies and chemical compositions were studied using Field-emission scanning electron microscope(FE-SEM),Fourier transform infrared spectrophotometer(FT-IR)and X-ray diffraction(XRD).The degradation behavior of the bare Mg alloy and its MAO coating was studied through electrochemical and hydrogen evolution *** assay was applied to evaluate the biocompatibility of Mg alloy substrate and MAO *** indicated that the presence of BSA decreased the degradation rate of Mg alloy substrate because BSA(RCH(NH2)COO‾)molecules combined with Mg2+ions to form(RCH(NH2)COO)2Mg and thus inhibited the dissolution of Mg(OH)2 by impeding the attack of Cl‾*** the case of MAO coated Mg alloy,the adsorption of BSA on MAO coating and the formation of(RCH(NH2)COO)2Mg exhibited a synergistic effect and enhanced the corrosion resistance of the coated alloy ***,cell bioactive assay suggested that the MAO coating had good viability for MG63 cells due to its high surface area.

关键词： Magnesium alloy Protein Degradation Micro-arc oxidation Biocompatibility

Biodegradation,hemocompatibility and covalent bonding mechanism of electrografting polyethylacrylate coating on Mg alloy for cardiovascular stent

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第11期42卷 114-126页

作者： Yong-Xin Yang Zhe Fang Yi-Hao Liu Ya-Chen Hou Li-Guo Wang Yi-Fan Zhou Shi-Jie Zhu Rong-Chang Zeng yu-feng zheng Shao-Kang Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou450002China Key Laboratory of Advanced Materials Processing&Mold Ministry of Education Zhengzhou450002China Corrosion Laboratory of Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao266590China State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China

Organic coatings are the most widely employed approach for the promotion of corrosion resistance of magnesium(Mg)***,traditional organic coatings are weakly bonded to Mg substrates due to physical ***,a polyethylacrylate(PEA)coating was fabricated on Mg-Zn-YNd alloy via *** surface structure and chemical composition were characterized by means of scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),atomic force microscope(AFM)and Fourier transform infrared(FTIR)as well as time of flight-secondary ion mass spectrometer(To F-SIMS).The results showed that the surface roughness of PEA coating was dominated by scan rate;while the coverage and integrity of PEA coating were mainly affected by the monomer concentration and sweep *** F-SIMS results indicated that PEA coating was wholly covered on Mg alloy,and the presence of C2H3Mg-fragment confirmed the covalent bond between PEA coating and Mg *** addition,DFT calculation results of the adsorption of EA molecules with Mg substrate agree well with the experimental phenomena and observation,suggesting that the electrons in 3s orbit of Mg atoms and 2pz orbit of C1 atom participated in the formation of covalent bond between PEA coating and Mg *** polarization curves and immersion test demonstrated that the PEA coatings could effectively enhance the corrosion resistance of Mg *** platelet adhesion results designated that platelets were barely visible on PEA coating,which implied that PEA coating could effectively prevent the thrombosis and coagulation of *** coating might be a promising candidate coating of Mg alloy for cardiovascular stent.

关键词： Magnesium alloy Organic coating Electro-grafting Covalent bond Density functional theory Biomaterial

Advances in bioorganic molecules inspired degradation and surface modifications on Mg and its alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2022年第3期10卷 723-745页

作者： Lei Cai Di Mei Zhao-Qi Zhang yuan-ding Huang Lan-yue Cui Shao-Kang Guan Dong-Chu Chen M.Bobby Kannan yu-feng zheng Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China MagIC-Magnesium Innovation Centre and Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck Straûe 1Geesthacht 21502Germany School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China School of Engineering University of NewcastleCallaghanNSW 2308Australia College of Science and Engineering James Cook UniversityTownsvilleQL 4811Australia School of Materials Science and Engineering Peking UniversityBeijing 100871China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China

Mg alloys possess biodegradability,suitable mechanical properties,and biocompatibility,which make them possible to be used as biodegradable ***,the uncontrollable degradation of Mg alloys limits their general *** addition to the factors from the metallic materials themselves,like alloy compositions,heat treatment process and microstructure,some external factors,relating to the test/service environment,also affect the degradation rate of Mg alloys,such as inorganic salts,bioorganic small molecules,bioorganic *** influence of bioorganic molecules on Mg corrosion and its protection has attracted more and more *** this work,the cutting-edge advances in the influence of bioorganic molecules(i.e.,protein,glucose,amino acids,vitamins and polypeptide)and their coupling effect on Mg degradation and the formation of protection coatings were *** research orientations of biomedical Mg alloys in exploring degradation mechanisms in vitro were proposed,and the impact of bioorganic molecules on the protective approaches were also explored.

关键词： Magnesium alloy Biomaterial Bioorganic molecules Degradation Coating Glucose.

Photothermal-controlled sustainable degradation of protective coating modified Mg alloy using near-infrared light

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第9期40卷 2538-2551页

作者： Zhi-Xin Han Xiang-Mei Liu Lei Tan Zhao-Yang Li yu-feng zheng Kelvin Wai-Kwok Yeung Zhen-Duo Cui Yan-Qin Liang Sheng-Li Zhu Shui-Lin Wu Hubei Key Laboratory of Polymer Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhan 430062China The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China School of Materials Science&EngineeringTianjin UniversityTianjin 300072China State Key Laboratory for Turbulence and Complex System Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China Department of Orthopaedics and Traumatology Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulam 999077Hong KongChina

Controlling the corrosion rate is critical for practical applications of Mg-based alloys. In this work, we constructed a protective coating of hybrid polycaprolactone(H-PCL)/indocyanine green(ICG) on AZ31 Mg alloy,whose degradation rate was controlled by 808-nm nearinfrared(NIR) light irradiation. The corrosion behaviors of H-PCL/ICG coated Mg alloys were systematically investigated by potentiodynamic polarization tests, electrochemical impedance spectroscopy(EIS) and hydrogen evolution experiments. The results disclosed that the H-PCL/ICG composite coating could effectively protect Mg alloy from corroding without NIR light irradiation. In contrast, under 808-nm NIR light irradiation, the corrosion resistance of this composite coating was decreased significantly, i.e., the corrosion current density(i_(corr))increasedfrom(8.81 ± 1.068) 9 10^(-8) to(1.22 ± 0.545) 9 10^(-6) A·cm^(-2). This is because the component of ICG in the coating was excited to produce heat locally, which triggered the glass transition temperature(T_(g)) of H-PCL in the coating, resulting in the motion of the molecular chain segment. Consequently, the electrolytes penetrated the coating and corroded the Mg substrate. In vitro biological experiment indicated that the synthesized coating exhibited good ***, these findings will provide a new strategy for designing novel photoresponsive coatings to remotely adjust the degradation rate of biodegradable metals for biomedical applications.

关键词： Magnesium Corrosion Coating Photoresponsive Surface modification

High strength and high electrical conductivity CuMg alloy prepared by cryorolling

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2019年第3期29卷 595-600页

作者： yun-xiang TONG Si-yuan LI Dian-tao ZHANG Li LI yu-feng zheng Institute of Materials Processing and Intelligent Manufacturing College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China

The microstructure, mechanical properties and electrical conductivity of the room-temperature and cryogenically rolled Cu-0.2wt.%Mg alloy were investigated by transmission electron microscopy (TEM), electron backscattered diffraction (EBSD), hardness measurement, tensile tests and electrical conductivity measurement. The results show that for the cryorolled sample, the grain size is decreased by 41% compared with the sample processed at room temperature. With increasing thickness reduction, the microhardness of the alloy continuously increases and the electrical conductivity decreases. For the sample with 90% thickness reduction rolled at cryogenic temperature, the tensile strength and the electrical conductivity are 726 MPa and 74.5% IACS, respectively. The improved tensile strength can be mainly attributed to the grain boundaries strengthening and dislocation strengthening.

关键词： CuMg alloy cryorolling mechanical properties grain size twin

A review on in vitro corrosion performance test of biodegradable metallic materials

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2013年第8期23卷 2283-2293页

作者：甄珍奚廷斐郑玉峰北京大学前沿交叉学科研究院生物材料与组织工程中心北京100871 温州医学院信息工程学院温州325035 北京大学工学院材料科学与工程系北京100871

Extensive in vitro corrosion test systems have been carried out to simulate the in vivo corrosion behavior of biodegradable metallic materials. Various methods have their own unique benefits and limitations. The corrosion mechanism of biodegradable alloys and in vitro corrosion test systems on biodegradable metallic materials are reviewed, to build a reasonable simulated in vitro test system for mimicking the in vivo animal test from the aspects of electrolyte solution selection, surface roughness influence, test methods and evaluation methodology of corrosion rate. Buffered simulated body fluid containing similar components to human blood plasma should be applied as electrolyte solution, such as simulated body fluid （SBF） and culture medium with serum. Surface roughness of samples and ratio of solution volume to sample surface area should be adopted based on the real implant situation, and the dynamic corrosion is preferred. As to the evaluation methodology of corrosion rate, different methods may complement one another.

关键词： biodegradable metallic material in vitro corrosion test Mg Fe

Numerical Simulation to Reliability Analysis of Fault-Tolerant Repairable System

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2010年第5期15卷 526-534页

作者：梁晓锋易宏张裕芳冯正平 School of Naval Architecture Ocean and Civil EngineeringShanghai Jiaotong University

In the traditional method for the reliability analysis of fault-tolerant system,the system structure is described by means of binary decision diagram (BDD) and Markov process,and then the reliability indexes are ***,as the size of system augments,the size of state space will increase ***,Markov approach requires that the failure and repair time of the components obey an exponential *** this study,by combining dynamic fault tree (DFT) and numerical simulation based on the minimal sequence cut set (MSCS),a new method to evaluate reliability of fault-tolerant system with repairable components is *** method presented does not depend on Markov model,so that it can effectively solve the problem of the state-space combination ***,it is suitable for systems whose failure and repair time obey an arbitrary ***,our method is more flexible than the traditional *** last,an example is given to verify the method.

关键词： reliability analysis fault-tolerant repairable system dynamic fault tree (DFT) minimal sequence cut set (MSCS)