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Comparative Study of the Effects of Nano ZnO and CuO on the Biodegradation,Biocompatibility,and Antibacterial properties of Micro-arc Oxidation Coating of Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 242-254页

作者： Ying Shen Xianfeng Shan iniobong p.etim Muhammad Ali Siddiqui Yang Yang Zewen Shi Xuping Su Junxiu Chen Key Laboratory of Materials Surface Science and Technology of Jiangsu province Changzhou UniversityChangzhou213164China Department of Stomatology The Affiliated Xinhua Hospital of Dalian UniversityDalian116000China Department of physics University of CalabarCalabar540242Nigeria Metallurgical Engineering Department NED University of Engineering and TechnologyUniversity RoadKarachi75270Pakistan Ningbo No.2 Hospital Ningbo315010China

This research systematically examined the degradation,antibacterial effects,and biocompatibility of micro-arc oxidation(MAO)coatings with nano CuO and ZnO on extruded Mg *** copper(Cu)and Zinc(Zn)possess antibacterial *** findings demonstrated that adding ZnO will appreciably reduce the degradation rate of MAO-coating alloy due to the self-sealing micro ***+MAO coating exhibited excellent antibacterial performance,with an antibacterial rate of over 90%within 6 h co-cultured with Staphylococcus ***,the antibacterial rate of ZnO+MAO coating reached 90%after 12 h *** test using MG63 cell indicated that the incorporation of CuO and ZnO did not notably affect the cell viability rate of the ***,after 14 days of culture,the CuO+MAO and ZnO+MAO coated samples exhibited higher alkaline phosphatase(ALp)activity than the MAO-coated and uncoated samples,suggesting favorable osteogenic properties.

关键词： Copper oxide Zinc oxide Micro-arc oxidation(MAO)coating Corrosion behavior Antibacterial characteristics

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Microstructural Evolution and Biodegradation Response of Mg–2Zn–0.5Nd Alloy During Tensile and Compressive Deformation

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Acta Metallurgica Sinica(English Letters) 2021年第6期34卷 834-844页

作者： iniobong p.etim Wen Zhang Yi Zhang Lili Tan Ke 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

The effect of deformation behavior on the in vitro corrosion rate of Mg–2Zn–0.5 Nd alloy was investigated experimentally after uniaxial tensile and compressive *** microstructure and texture were characterized using electron backscattered diffraction and X-ray diffraction,while potentiodynamic polarization and immersion tests were used to investigate the corrosion response after *** result reveals that applied compressive stress has more dominant effect on the corrosion rate of Mg–2 Zn–0.5 Nd alloy as compared to tensile *** tensile and compressive strains introduce dislocation slip and deformation twins in the alloy,thereby accelerating the corrosion rate due to the increased stress corrosion related to dislocation slips and deformation ***{10ī2}tension twinning and prismatic slip were the major contributors to tensile deformation while basal slip,and{10ī2}tension twin were obtainable during compressive *** twinning activity after deformation increases with the plastic strain and this correlates with the degradation rate.

关键词： Magnesium EBSD Corrosion Deformation Twinning

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Effects of microstructure on the torsional properties of biodegradable WE43 Mg alloy

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Journal of Materials Science & Technology 2020年第16期47卷 102-110页

作者： Yi Zhang Lili Tan Qingchuan Wang Ming Gao iniobong p.etim Ke Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Torsional properties are important performance parameters for bone screw applications,but they are seldom studied,especially for newly developed biodegradable Mg *** this study,WE43 Mg alloy with different microstructures was achieved by equal channel angular pressing(ECAp)and heat treatment,and their torsional properties were *** addition,tensile properties were also tested as a *** results indicated that grain refinement led to higher torsional strength and ductility,while the second phases improved the torsional strength but reduced the *** texture was strengthened after ECAp,as a result the tensile strength increased,but the torsional strength did not increase and even decreased,especially for 2-pass ECAp sample with a typical basal fiber *** basal plane orientation deviation from the extrusion direction after 4-pass ECAp resulted in higher torsional strength and lower torsional ductility,but lower tensile strength and higher tensile ductility were *** implied that a strong fiber texture would reduce the torsional strength but improve the torsional ductility,which was different from its effect on tensile properties.

关键词： Torsional properties Texture ECAp WE43 Mg alloy

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Influence of stamping on the biodegradation behavior of Mg–2Zn-0.5Nd (ZN20) sheet

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Bioactive Materials 2020年第1期5卷 133-141页

作者： iniobong p.etim Wen Zhang Lili Tan Ke Yang Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

Stamping processing is commonly used to form medical devices and ***,for biodegradable Mg alloy,the stamping will influence the degradation behavior because of the change in microstructure after *** in this study,the As-rolled Mg–2Zn-0.5Nd alloy(ZN20)was processed by *** microstructure,crystallographic orientation and corrosion performance of this processing method was investigated to reveal the influence of the stamping process on the degradation rate of Rolled Mg–2Zn–Nd(ZN20).The degradation rate was measured by immersion of the Mg–2Zn-0.5Nd alloy in simulated body fluid using Electrochemical Impedance Spectroscopy,potentiodynamic polarization and mass *** in vitro degradation result shows that the degradation rate of the Rolled Mg–2Zn-0.5Nd increased from 0.2 mm/year to 0.5 mm/year after stamping *** result reveals that the activation of the{101‾2}tension twin during stamping can remarkably weaken the{0001}basal texture and have a significant influence on the corrosion rate of Stamped Mg–2Zn-0.5Nd *** removing the deformation by annealing,the degradation rate was reduced to 0.15 mm/*** work is expected to prompt better microstructural design of biomedical Mg in order to control its degradation behavior for biomedical application.

关键词： Texture Degradation rate Crystallographic orientation Stamping Annealing Twin Deformation

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Microstructure,mechanical and corrosion properties of Mg-Zn-Nd alloy with different accumulative area reduction after room-temperature drawing

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Rare Metals 2021年第4期40卷 897-907页

作者： Ming Gao Zheng Ma iniobong petim Li-Li Tan Ke Yang School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Good mechanical properties and corrosion resistance are the key factors for the application of biodegradable magnesium alloy wires as new medical implant *** study is aimed at investigating the influence of micros true tural evolution on mechanical and corrosion properties of Mg-2 Zn-0.5 Nd alloy(ZN20) during room-temperature *** decreases in the crosssectional area of ZN20 alloy during drawing refined the grains from 10 to 5 μm under the influence of cold deformation,the basal texture was rotated around radius direction,the basal texture became dominant,and the texture transformed from drawing direction(DD)// to a point between and parallel to *** ultimate tensile strength of the wire was increased by 44.7% compared with that of the extruded alloy due to grain boundary strengthening,hard orientation and work hardening during drawing process,while the elongation was decreased by 85% under the influence of work *** corrosion resistance of the alloy was improved after drawing due to grain refinement,while it was sensitive to prismatic texture.

关键词： Magnesium Drawing Texture Corrosion property Mechanical property

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Determination of Nutrient Contents in the Leaf Litter of <i>Diospyros crassiflora</i>S. (Hiern-FWTA) plantation in Okwuta-Ibeku, Umuahia, Abia State, Nigeria

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Open Journal of Forestry 2022年第1期12卷 162-176页

作者： Bruno iniobong Nsien Eric etim Offiong pretty Henry Dan Esther Ewongoabasi Eric Forestry Research Institute of Nigeria Ibadan Nigeria Department of Forestry and Wildlife Resources Management University of Calabar Calabar Nigeria

Determination of nutrient contents in Diospyros crassiflora leaf litter was carried out in the Forestry Research Institute of Nigeria (FRIN), Okwuta-Ibeku, Umuahia, Abia State, Nigeria in 2016 and 2017. Three 1 pan>pan>m pan>pan>× 1pan>pan>pan> pan>pan>m trays were randomly positioned for collection of leaf litter production from 4/5pan>pan> pan>pan>years old Diospyros crassiflora species in each block (10pan>pan> pan>pan>m pan>pan>× 25pan>pan>pan> pan>pan>m) within the plantation totaling 1.5pan>pan> pan>pan>ha. A Randomised Complete Block Design (RCBD) with three replicates was used to study the mean monthly leaf litterfall of Diospyros crassiflora. Leaf litter was collected from each of the three litter trays per block and placed in paper bags every 28th day of each month from January-December in 2016 and in 2017. Fifteen grammes (15pan>pan> pan>pan>g) of properly mixed and oven-dried samples of D. crassiflora leaf litter were milled and sieved in 1pan>pan>pan>pan>pan style="fon

关键词： Diospyros crassiflora plantation Leaf Litter Nutrient Elements Concentrations

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