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

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 *** 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 *** the presence of oral microbiota,more severe pitting corrosion and faster dissolution of metallic ions including Ni and Cr were *** biofilm considerably decreased the pitting potential of 316 L SS from 1268.0±29.1 mV ***(abiotic control)to less than 500 mV *** 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

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Microbial Electrosynthesis for Producing Medium Chain Fatty Acids

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Engineering 2022年第9期16卷 141-153页

作者： Na Chu Wen Hao Qinglian Wu Qinjun Liang Yong Jiang Peng Liang Zhiyong Jason Ren Raymond Jianxiong Zeng Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China College of Architecture and Environment Sichuan UniversityChengdu 610065China Department of Civil and Environmental Engineering&Andlinger Center for Energy and the Environment Princeton UniversityPrincetonNJ 08544USA

Microbial electrosynthesis(MES)employs microbial catalysts and electrochemistry to enhance CO_(2)bioconversion to organics with concurrent waste biorefining *** aim of this review is to comprehensively discuss the current state of the art and prospects of medium chain fatty acids(MCFAs)production in MES from CO_(2)and organic *** mechanisms and development of MCFAs production via conventional fermentation are introduced as *** on MCFAs production in MES are summarized,highlighting the strategy of multiple-electron donors(EDs).Challenges for MCFAs production in MES from CO_(2)are presented,and the primary discussions included methanogenesis inhibition,adenosine triphosphate(ATP)limitations of acetogens,and production of limited EDs via *** applications of electrochemical approaches to promote the bioconversion of actual waste materials with MCFAs production are ***,future directions are explored,including multi-stage reactions,substrate supply,product extraction,and microbial pathways.

关键词： Electro-fermentation Microbial electrochemistry Acetogen Chain elongation electroactive microorganism

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