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Improving corrosion resistance of additively manufactured WE43 magnesium alloy by high temperature oxidation for biodegradable applications

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Journal of Magnesium and Alloys 2024年第3期12卷 940-953页

作者： Jinge liu Bangzhao Yin Fei Song bingchuan liu Bo Peng Peng Wen Yun Tian Yufeng Zheng Xiaolin Ma Caimei Wang State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Department of Orthopaedics Beijing Tsinghua Changgung HospitalInstitute for Precision MedicineTsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China School of Materials Science and Engineering Peking UniversityBeijing 100871China Beijing AKEC Medical Co. Ltd.Beijing 102200China

Laser powder bed fusion(L-PBF)has been employed to additively manufacture WE43 magnesium(Mg)alloy biodegradable implants,but WE43 L-PBF samples exhibit excessively rapid corrosion.In this work,dense WE43 L-PBF samples were built with the relativity density reaching 99.9%.High temperature oxidation was performed on the L-PBF samples in circulating air via various heating temperatures and holding durations.The oxidation and diffusion at the elevated temperature generated a gradient structure composed of an oxide layer at the surface,a transition layer in the middle and the matrix.The oxide layer consisted of rare earth(RE)oxides,and became dense and thick with increasing the holding duration.The matrix was composed ofα-Mg,RE oxides and Mg_(24)RE_(5) precipitates.The precipitates almost disappeared in the transition layer.Enhanced passivation effect was observed in the samples treated by a suitable high temperature oxidation.The original L-PBF samples lost 40%weight after 3-day immersion in Hank’s solution,and broke into fragments after 7-day immersion.The casted and solution treated samples lost roughly half of the weight after 28-day immersion.The high temperature oxidation samples,which were heated at 525℃ for 8 h,kept the structural integrity,and lost only 6.88%weight after 28-day immersion.The substantially improved corrosion resistance was contributed to the gradient structure at the surface.On one hand,the outmost dense layer of RE oxides isolated the corrosive medium;on the other hand,the transition layer considerably inhibited the corrosion owing to the lack of precipitates.Overall,high temperature oxidation provides an efficient,economic and safe approach to inhibit the corrosion of WE43 L-PBF samples,and has promising prospects for future clinical applications.

关键词： Laser powder bed fusion Biodegradable magnesium alloy High temperature oxidation Corrosion resistance WE43.

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Influence of layer thickness on formation quality,microstructure,mechanical properties,and corrosion resistance of WE43 magnesium alloy fabricated by laser powder bed fusion

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Journal of Magnesium and Alloys 2024年第4期12卷 1367-1385页

作者： Bangzhao Yin Jinge liu Bo Peng Mengran Zhou bingchuan liu Xiaolin Ma Caimei Wang Peng Wen Yun Tian Yufeng Zheng State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Institute for Precision Medicine Tsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Beijing AKEC Medical Co. Ltd.Beijing 102200China School of Materials Science and Engineering Peking UniversityBeijing 100871China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China

Laser powder bed fusion(L-PBF)of Mg alloys has provided tremendous opportunities for customized production of aeronautical and medical parts.Layer thickness(LT)is of great significance to the L-PBF process but has not been studied for Mg alloys.In this study,WE43 Mg alloy bulk cubes,porous scaffolds,and thin walls with layer thicknesses of 10,20,30,and 40μm were fabricated.The required laser energy input increased with increasing layer thickness and was different for the bulk cubes and porous scaffolds.Porosity tended to occur at the connection joints in porous scaffolds for LT40 and could be eliminated by reducing the laser energy input.For thin wall parts,a large overhang angle or a small wall thickness resulted in porosity when a large layer thicknesses was used,and the porosity disappeared by reducing the layer thickness or laser energy input.A deeper keyhole penetration was found in all occasions with porosity,explaining the influence of layer thickness,geometrical structure,and laser energy input on the porosity.All the samples achieved a high fusion quality with a relative density of over 99.5%using the optimized laser energy input.The increased layer thickness resulted to more precipitation phases,finer grain sizes and decreased grain texture.With the similar high fusion quality,the tensile strength and elongation of bulk samples were significantly improved from 257 MPa and 1.41%with the 10μm layer to 287 MPa and 15.12%with the 40μm layer,in accordance with the microstructural change.The effect of layer thickness on the compressive properties of porous scaffolds was limited.However,the corrosion rate of bulk samples accelerated with increasing the layer thickness,mainly attributed to the increased number of precipitation phases.

关键词： Magnesium alloy WE43 Laser powder bed fusion Layer thickness Process optimization

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Comparison of different valent iron on anaerobic sludge digestion:Focusing on oxidation reduction potential,dissolved organic nitrogen and microbial community

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Frontiers of Environmental Science & Engineering 2022年第6期16卷 159-170页

作者： Zecong Yu Keke Xiao Yuwei Zhu Mei Sun Sha Liang Jingping Hu Huijie Hou bingchuan liu Jiakuan Yang School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Provincial Engineering Laboratory of Solid Waste Treatment Disposal and RecyclingWuhan 430074China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

This study compared effects of three different valent iron(Fe^(0),Fe(II)and Fe(III))on enhanced anaerobic sludge digestion,focusing on the changes of oxidation reduction potential(ORP),dissolved organic nitrogen(DON),and microbial community.Under the same iron dose in range of 0−160 mg/L after an incubation period of 30 days(d),the maximum methane production rate of sludge samples dosed with respective Fe^(0),Fe(II)and Fe(III)at the same concentration showed indiscernible differences at each iron dose,regardless of the different iron valence.Moreover,their behavior in changes of ORP,DON and microbial community was different:(1)the addition of Fe^(0) made the ORP of sludge more negative,and the addition of Fe(II)and Fe(III)made the ORP of sludge less negative.However,whether being more or less negative,the changes of ORP may show unobservable effects on methane yield when it ranged from−278.71 to−379.80 mV;(2)the degradation of dissolved organic nitrogen,particularly proteins,was less efficient in sludge samples dosed with Fe^(0) compared with those dosed with Fe(II)and Fe(III)after an incubation period of 30 d.At the same dose of 160 mg/L iron,more cysteine was noted in sludge samples dosed with Fe(II)(30.74 mg/L)and Fe(III)(27.92 mg/L)compared with that dosed with Fe^(0)(21.75 mg/L);(3)Fe^(0) particularly promoted the enrichment of Geobacter,and it was 6 times higher than those in sludge samples dosed with Fe(II)and Fe(III)at the same dose of 160 mg/L iron.

关键词： Enhanced anaerobic sludge digestion Different iron valence Oxidation reduction potential Dissolved organic nitrogen Microbial community

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Recent Advances on the Development of Functional Materials in Microbial Fuel Cells:From Fundamentals to Challenges and Outlooks

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Energy & Environmental Materials 2022年第2期5卷 401-426页

作者： Qian Zhu Jingping Hu bingchuan liu Shaogang Hu Sha Liang Keke Xiao Jiakuan Yang Huijie Hou School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan Hubei 430074China Hubei Provincial Engineering Laboratory of Solid Waste Treatment Disposal and RecyclingWuhan Hubei 430074China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan Hubei 430074China

Microbial fuel cells(MFCs),as a sustainable and promising technology to solve both environmental pollution and energy shortage,have captured tremendous attention.The conversion efficiency of chemical energy contained in organic waste or wastewater to electricity via microbial metabolism strongly depends on the performance of each functional unit,including the anode,cathode and separator/membrane used in MFCs.Therefore,significant attention has been paid toward developing advanced functional materials to enhance the performance of each unit or provide new featured functions.This review paper provides a comprehensive review on recent achievements and advances in the modification and development of functional materials for MFC systems,including 1)the development of functional anode materials for enhanced microbial compatibilities as well as electron transfer capabilities,2)the development of cost-effective separators/membranes such as ion exchange membrane,porous membrane,polymer electrolyte membrane and composite membrane,and 3)the development of functional cathode catalysts to decrease the over-potential and enhance the electrocatalytic efficiency for oxygen reduction reaction in order to substitute the common costly Pt catalyst.The challenges and outlooks of functional materials for MFC applications are also discussed.

关键词： anode cathode functional material membrane microbial fuel cell

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The effect of pore size on the mechanical properties, biodegradation and osteogenic effects of additively manufactured magnesium scaffolds after high temperature oxidation: An in vitro and in vivo study

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Bioactive Materials 2023年第10期28卷 537-548页

作者： Chaoxin Wang Jinge liu Shuyuan Min Yu liu bingchuan liu Yuanyu Hu Zhengguang Wang Fengbiao Mao Caimei Wang Xiaolin Ma Peng Wen Yufeng Zheng Yun Tian Department of Orthopedics Peking University Third HospitalBeijing100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing100191China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Institute of Medicine Innovation and Research Peking University Third HospitalBeijing100191China Beijing AKEC Medical Co. Ltd.Beijing102200China School of Materials Science and Engineering Peking UniversityBeijing100871China

The effects of pore size in additively manufactured biodegradable porous magnesium on the mechanical properties and biodegradation of the scaffolds as well as new bone formation have rarely been reported. In this work, we found that high temperature oxidation improves the corrosion resistance of magnesium scaffold. And the effects of pore size on the mechanical characteristics and biodegradation of scaffolds, as well as new bone formation, were investigated using magnesium scaffolds with three different pore sizes, namely, 500, 800, and 1400 μm (P500, P800, and P1400). We discovered that the mechanical characteristics of the P500 group were much better than those of the other two groups. In vitro and in vivo investigations showed that WE43 magnesium alloy scaffolds supported the survival of mesenchymal stem cells and did not cause any local toxicity. Due to their larger specific surface area, the scaffolds in the P500 group released more magnesium ions within reasonable range and improved the osteogenic differentiation of bone mesenchymal stem cells compared with the other two scaffolds. In a rabbit femoral condyle defect model, the P500 group demonstrated unique performance in promoting new bone formation, indicating its great potential for use in bone defect regeneration therapy.

关键词： Pore size Additive manufacturing WE43 alloy Magnesium alloy

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Performance evaluation of microbial fuel cell for landfill leachate treatment: Research updates and synergistic effects of hybrid systems

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Journal of Environmental Sciences 2020年第10期32卷 1-20页

作者： Khaled Elmaadawy bingchuan liu Jingping Hu Huijie Hou Jiakuan Yang School of Environmental Science and Engineering Huazhong University of Science and Technology(HUST)Wuhan 430074China Hubei Provincial Engineering Laboratory of Solid Waste Treatment Disposal and RecyclingWuhan 430074China State Key Laboratory of Coal Combustion Huazhong University of Science and Technology(HUST)Wuhan 430074China

Over half of century,sanitary landfill was and is still the most economical treatment strategy for solid waste disposal,but the environmental risks associated with the leachate have brought attention of scientists for its proper treatment to avoid surface and ground water deterioration.Most of the treatment technologies are energy-negative and cost intensive processes,which are unable to meet current environmental regulations.There are continuous demands of alternatives concomitant with positive energy and high effluent quality.Microbial fuel cells(MFCs)were launched in the last two decades as a potential treatment technology with bioelectricity generation accompanied with simultaneous carbon and nutrient removal.This study reviews capability and mechanisms of carbon,nitrogen and phosphorous removal from landfill leachate through MFC technology,as well as summarizes and discusses the recent advances of standalone and hybrid MFCs performances in landfill leachate(LFL)treatment.Recent improvements and synergetic effect of hybrid MFC technology upon the increasing of power densities,organic and nutrient removal,and future challenges were discussed in details.

关键词： Microbial fuel cells Landfill leachate Nutrient removal Single chamber microbial fuel cell Dual chamber microbial fuel cell Hybrid microbial fuel cell

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Promoting brain-computer interface in China by BCI Controlled Robot Contest in World Robot Contest

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Brain Science Advances 2022年第2期8卷 79-81页

作者： bingchuan liu Xiaogang Chen Yijun Wang Xiaorong Gao Department of Biomedical Engineering Tsinghua UniversityBeijing 100084China Institute of Biomedical Engineering Chinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin 300192China State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

The year ahead marks the 50th anniversary of the first publication on the brain-computer interface(BCI)proposed by Vidal in 1973.Over the past decades,continuous progress has been made in designing and optimizing the BCI system toward a high-performance,robust and ease-of-use“mind reading”.The nascent field of BCI has brought together scientists from neuroscience,computer science as well as engineers and clinicians worldwide to address the highly challenging problem.

关键词： interface designing computer

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Recent Advances and Perspective on Design and Synthesis of Electrode Materials for Electrochemical Sensing of Heavy Metals

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Energy & Environmental Materials 2018年第3期1卷 113-131页

作者： Huijie Hou Kemal M.Zeinu Shun Gao bingchuan liu Jiakuan Yang Jingping Hu School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Provincial Engineering Laboratory of Solid Waste Treatment Disposal and RecyclingWuhan 430074China Kombolcha Institute of Technology Wollo UniversityP.O.Box 208KombolchaEthiopia

The increase in release of toxic heavy metals into natural water attracts much attention due to its devastating effect on ecology and human health.The design and implementation of green electrode materials is pivotal ... 详细信息

关键词： bismuth electrochemical sensing environmental monitoring heavy metals nanostructured materials

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2014至2023年国家自然科学基金生物医学工程/再生医学方向的资助情况分析

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中国科学基金 2024年第2期38卷 349-356页

作者：刘冰川周子健郭伟圣蒋景英曹河圻国家自然科学基金委员会医学科学部北京100085 北京大学第三医院骨科北京100191 厦门大学分子影像暨转化医学研究中心厦门361102 广州医科大学生物医学工程学院广州511430 北京航空航天大学医学科学与工程学院北京100191

本文汇总2014—2023年国家自然科学基金委员会医学科学部在生物医学工程/再生医学方向面上项目、青年科学基金项目与地区科学基金项目(简称“面青地项目”)的申请与资助情况,同时分析近10年相关领域的文献报道热点,为该领域的进一步高... 详细信息

本文汇总2014—2023年国家自然科学基金委员会医学科学部在生物医学工程/再生医学方向面上项目、青年科学基金项目与地区科学基金项目(简称“面青地项目”)的申请与资助情况,同时分析近10年相关领域的文献报道热点,为该领域的进一步高水平发展提供参考依据。回顾性收集代码H28下面青地项目的申请与资助数据资料,主要包括:资助项数与资助经费、资助项目所在依托单位与省市分布、获资助申请人的年龄与职称分布、获资助项目申请书的关键词等内容。同时,基于Web of Science数据库对近10年发表的相关方向文献关键词进行汇总,利用CiteSpace 6.2.R4软件对关键词的热点聚类及时间分布进行分析。通过分析发现:在2014—2023年中,生物医学工程/再生医学方向共资助面青地项目1279项,包括面上项目623项、青年科学基金项目599项和地区科学基金项目57项,资助经费50799万元。其中2014年的资助项目数最少,2023年的资助项目数最多。该方向的项目资助主要集中在H2808、H2809及H2810,3个代码获资助项目数与经费总和分别占全部项目的65.9%及64.6%。上海市、上海交通大学分别是获资助项目数最多的地区、依托单位,分别占比14.7%和7.0%。31~35岁的申请人获资助项目数最多,共507项,占比39.6%。近10年该方向获资助面青地项目申请书中出现频率最高的中英文关键词都与纳米相关(纳米药物和nanomedicine),而在Web of Science数据库中已发表相关方向文献的热门关键词包括biomedical engineering、tissue engineering、biomedical applications等。近年来,国家自然科学基金委员会医学科学部对生物医学工程/再生医学方向面青地项目的资助呈稳步上升趋势,资助领域广泛且重点明确,逐步建立以青年科研人员为主体的人才梯队。

关键词：项目资助研究进展生物医学工程再生医学国家自然科学基金

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BCI Controlled Robot Contest on the 50th Anniversary of Brain-Computer Interfaces

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Brain Science Advances 2023年第4期9卷 237-241页

作者： bingchuan liu Xiaogang Chen Jingjing Chen Dan Zhang Yijun Wang Xiaorong Gao Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing 100084China Institute of Biomedical Engineering Chinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin 300020China Department of Psychology School of Social SciencesTsinghua UniversityBeijing 100084China State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Dioision of Biology and Biological Engineering California Institute of TechnologyPasadena 91125USA

Introduction Is it feasible to employ neural signals for the purpose of communication?In 1938,this thoughtprovoking query was visually embodied in a sketch received by Hans Berger,a German Professor of Psychiatry reno... 详细信息

关键词： sketch Robot feasible

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