检索结果-南通市图书馆

Wear-resistant Ag-MAX phase 3D interpenetrating-phase composites:Processing,structure,and properties

Nano Research 2024年第2期17卷 806-819页

作者： Yu Guo Xi Xie Zengqian Liu Longchao Zhuo Jian Zhang Shaogang Wang Qiqiang Duan Qing Jia Dake Xu Weihai Xue Deli Duan Filippo Berto Zhefeng Zhang Rui Yang Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China electrobiomaterials institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Chemical Engineering Materials and EnvironmentSapienza University of RomeRoma 00185Italy

Electrical contact materials are generally Ag-or Cu-based composites and play a critical role in ensuring the reliability and efficiency of electrical equipments and electronic instruments.The MAX(M is an early transition metal,A is an element from III or IV main groups,and X is carbon or/and nitrogen)phase ceramics display a unique combination of properties and may serve as an ideal reinforcement phase for electrical contact materials.The biological materials evolved in nature generally exhibit three-dimensional(3D)interpenetrating-phase architectures,which may offer useful inspiration for the architectural design of electrical contact materials.Here,a series of bi-continuous Ag-Ti_(3)SiC_(2) MAX phase composites with high ceramic contents exceeding 50 vol.%and having micron-and ultrafine-scaled 3D interpenetrating-phase architectures,wherein both constituents were continuous and mutually interspersed,were exploited by pressureless infiltration of Ag melt into partially sintered Ti_(3)SiC_(2) scaffolds.The mechanical and electrical properties as well as the friction and wear performance of the composites were investigated and revealed to be closely dependent on the ceramic contents and characteristic structural dimensions.The composites exhibited a good combination of properties with high hardness over 2.3 GPa,high flexural strength exceeding 530 MPa,decent fracture toughness over 10 MPa·m^(1/2),and good wear resistance with low wear rate at an order of 10^(-5)mm^(3)/(N·m),which were much superior compared to the counterparts made by powder metallurgy methods.In particular,the hardness,electrical conductivity,strength,and fracture toughness of the composites demonstrated a simultaneous improvement as the structure was refined from micron-to ultrafine-scales at equivalent ceramic contents.The good combination of properties along with the facile processing route makes the Ag-Ti_(3)SiC_(2)3D interpenetrating-phase composites appealing for electrical contact applications.

关键词： three-dimensional(3D)interpenetrating-phase architecture Ag-MAX(M=early transition metal A=element from III or IV main groups and X=carbon or/and nitrogen)phase composites melt infiltration electrical contact materials mechanical

来源：

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

Enhanced pitting corrosion resistance of CoCrFeMnNi high entropy alloy in the presence of Desulfovibrio vulgaris via nitrogen doping

引用

Journal of Materials Science & Technology 2023年第8期139卷 92-102页

作者： Chuntian Yang Hao Feng Xiaobo Chen Yu Han Huabing Li Dake Xu Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China electrobiomaterials institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang110819China School of Engineering RMIT UniversityCarltonVIC 3053Australia School of Metallurgy Northeastern UniversityShenyang110819China

Corrosion-resistant high nitrogen high entropy alloys(HEAs)were manufactured by pressurized metal-lurgy.This work revealed the inhibitory effect of nitrogen on pitting corrosion of HEAs caused by sul-fate reducing bacterium Desulfovibrio vulgaris.Results indicated that HEA-0 N was susceptible to pitting corrosion and sulfidation under attack of D.vulgaris,whereas the addition of nitrogen significantly de-creased the pitting sensitivity.Pitting potentials of HEA-0.52 N and HEA-1.23 N increased by 133%and 171%,respectively compared to HEA-0 N in the presence of SRB.X-ray photoelectron spectroscopy results unveiled that nitrogen enriched in passive film and strengthened it by increasing fraction of Cr_(2)O_(3)and Fe^(3+)_(ox).Surface of the nitrogen-alloyed HEAs exhibited less defective passive films as revealed by Mott-Schottky results.Nitrogen doping provides a novel insight into the design of microbial corrosion resistant HEA.

关键词： High entropy alloy Microbiologically influenced corrosion Sulfate reducing bacteria Nitrogen doping Pitting corrosion

来源：

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

Desulfovibrio vulgaris as a model microbe for the study of corrosion under sulfate-reducing conditions

引用

mLife 2022年第1期1卷 13-20页

作者： Toshiyuki Ueki Derek R.Lovley Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationElectrobiomaterials InstituteNortheastern UniversityShenyangChina Department of Microbiology University of Massachusetts AmherstMAUSA.

Corrosion of iron-containing metals under sulfate-reducing conditions is an economically important problem.Microbial strains now known as Desulfovibrio vulgaris served as the model microbes in many of the foundational studies that developed existing models for the corrosion of iron-containing metals under sulfate-reducing conditions.Proposed mechanisms for corrosion by D.vulgaris include:(1)H2 consumption to accelerate the oxidation of Fe0 coupled to the reduction of protons to H2;(2)production of sulfide that combines with ferrous iron to form iron sulfide coatings that promote H2 production;(3)moribund cells release hydrogenases that catalyze Fe0 oxidation with the production of H2;(4)direct electron transfer from Fe0 to cells;and(5)flavins serving as an electron shuttle for electron transfer between Fe0 and cells.The demonstrated possibility of conducting transcriptomic and proteomic analysis of cells growing on metal surfaces suggests that similar studies on D.vulgaris corrosion biofilms can aid in identifying proteins that play an important role in corrosion.Tools for making targeted gene deletions in D.vulgaris are available for functional genetic studies.These approaches,coupled with instrumentation for the detection of low concentrations of H2,and proven techniques for evaluating putative electron shuttle function,are expected to make it possible to determine which of the proposed mechanisms for D.vulgaris corrosion are most important.

关键词： corrosion Desulfovibrio electron shuttle extracellular electron transfer Fe0 oxidation hydrogenase hydrogen uptake sulfate reduction sulfide

来源：

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

Enhanced Corrosion Resistance and Biofilm Inhibition of Functionally Graded TC4/TC4-5Cu Fabricated by Selective Laser Melting against Streptococcus mutans

引用

Acta Metallurgica Sinica(English Letters) 2023年第12期36卷 1961-1978页

作者： Xing Zhou Qiyue Zhang Jiarui Lu Ying Zheng Lin Wu Dake Xu Xue Zhang Qiang Wang Savaid Stomatology School Hangzhou Medical CollegeHangzhou 311399China Liaoning Provincial Key Laboratory of Oral Diseases School and Hospital of StomatologyChina Medical UniversityShenyang 110001China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China electrobiomaterials institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China

Ti-6Al-4V(TC4)used in dentistry and orthopedics as implant biomaterial faces the risk of microbiologically influenced corrosion(MIC)owing to the residence of diverse oral microorganisms.Hereinto,Streptococcus mutans is a critical pathogenic microorganism that causes dental caries.This work investigated the corrosive effects of S.mutans on TC4 and functional gradient TC4/TC4-5Cu coupons fabricated by selective laser melting(SLM)through various electrochemical measurements,surface examination,observation of biofilm and corrosion analysis.The results indicated that the Cu-bearing alloy showed an inhibitory effect on the biofilms due to the release of Cu element,thereby reducing the corrosion rate of MIC.The corrosion current density(icorr)of TC4(11.7±0.8)nA cm−2 is higher than that of TC4/TC4-5Cu(7.4±0.4)nA cm−2 in the presence of S.mutans,while the maximum pit depth of TC4 is 1.6 times that of TC4/TC4-5Cu.Therefore,metal modification through Cu alloying is an effective strategy to improve the MIC resistance.

关键词： Microbiologically influenced corrosion-Streptococcus mutans Selective laser melting TC4/TC4-5Cu:Biofilm

来源：

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

Oral microbiota accelerates corrosion of 316L stainless steel for orthodontic applications

引用

Journal of Materials Science & Technology 2022年第33期128卷 118-132页

作者： Qingfu Wang Mingxing Zhang Chuntian Yang Yi Yang Enze Zhou Pan Liu Daiqiang Jin Dake Xu Lin Wu Fuhui Wang School and Hospital of Stomatology China Medical UniversityLiaoning Provincial Key Laboratory of Oral DiseasesShenyang 110001China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China electrobiomaterials institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China Department of Oral Implantology Tianjin Stomatological HospitalSchool of MedicineNankai University&Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin 300041China

In this work,microbiologically influenced corrosion(MIC)of 316 L stainless steel(SS)caused by oral microbiota was investigated with HOMINGS 16 S rRNA gene sequencing technology,and electrochemical and surface analysis techniques.The results showed that oral microbiota from different subjects developed multi-species biofilms with significant differences in structure and composition of bacteria strains on the316 L SS coupons.In the presence of oral microbiota,more severe pitting corrosion and faster dissolution of metallic ions including Ni and Cr were observed.The biofilm considerably decreased the pitting potential of 316 L SS from 1268.0±29.1 mV vs.SCE(abiotic control)to less than 500 mV vs.SCE.The corrosion current density in the presence of oral microbiota from subject 1(115.3±83.3 nA cm^(-2))and subject 2(184.4±162.0 nA cm^(-2))was at least 4 times more than that in the abiotic medium(28.0±2.3 nA cm^(-2)).The electroactive microorganisms with the potential to facilitate corrosion via extracellular electron transfer found in oral microbiota may be mainly responsible for the accelerated corrosion.

关键词： Oral microbiota Microbiologically influenced corrosion Stainless steel Electroactive microorganism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Host defense peptide-mimickingβ-peptide polymer displaying strong antibacterial activity against cariogenic Streptococcus mutans

引用

Journal of Materials Science & Technology 2023年第2期133卷 77-88页

作者： Yi Yang Yuxin Qian Mingxing Zhang Shuang Hao Hui Wang Yongqiang Fan Runhui Liu Dake Xu Fuhui Wang Life and Health Sciences Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China electrobiomaterials institute Key Laboratory for Anisotropy and Texture of MaterialsMinistry of EducationNortheastern UniversityShenyang 110819China State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237China School of Environmental and Safety Engineering Liaoning Petrochemical UniversityFushun 113001China Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistryResearch Center for Biomedical Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Cariogenic Streptococcus mutans(S.mutans)is a leading cause of bacterial-induced oral diseases.Current strategies to kill bacteria based on Host defense peptide(HDP)mimicking polymers hold promise to treat oral bacterial infection.Here,we explore the impact of hydrophobic subunit and chain length variation on the antibacterial and antibiofilm activity ofβ-peptide polymers.The physicochemical and biological prop-erties,such as the toxicity,the antibacterial activity,and the effect on bacterial transcription ofβ-peptide polymers,were systematically investigated with numerous techniques.The results exhibited that the op-timalβ-peptide polymer has low toxicity towards human periodontal ligament fibroblasts,andβ-peptide polymers(especially P3)have more excellent antibacterial activity against S.mutans than metronidazole.In addition,β-peptide polymers inhibited the reversible and irreversible bacterial adhesion during the formation of biofilms.The polymer can promote biofilm dispersion by decreasing the hydrophobicity of bacterial cells after adhering to cell surfaces.Analysis of the transcriptome for S.mutans treated withβ-peptide polymers demonstrated thatβ-peptide polymers could reduce the cariogenicity of S.mutans by impacting the transcription of the energy and acid metabolism-related genes.β-peptide polymers are promising antimicrobial agents in clinical dentistry due to their high antibacterial efficiency and low tox-icity.

关键词： β-peptide polymers Host defense peptide S.mutans RT-qPCR Transcriptome

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：