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Laser additive manufacturing of biodegradable Mg-based alloys for biomedical applications: A review

Journal of Magnesium and Alloys 2022年第4期10卷 915-937页

作者： c.L.wu W.J.Xie H.c.man Department of industrial and Systems Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Metallic.implants are widely used in internal fixation of bone fracture in surgical *** are mainly used for providing mechanical support and stability during bone reunion,which usually takes a few months to *** implants made of stainless steels,Ti-based alloys and cocrMo alloys have been widely used for orthopedic reconstruc.ion due to their high strength and high corrosion *** metallic.implants will remain permanently inside the body after implantation,and a second surgery after bone healing is needed because the long-term presence of implant will lead to various *** implant removal surgery not only incurs expenditure,but also risk and psychological *** a consequence,studies on the development of biodegradable implants,which would degrade and disappear in vivo after bone reunion is completed,have drawn researchers’*** this connec.ion,Mg-based alloys have shown great potentials as promising implant materials mainly due to their low density,inherent biocompatibility,biodegradability and mechanical properties close to those of ***,the high degradation rate of Mg-based implants in vivo is the biggest hurdle to *** from materials selec.ion,a fixation implant is ideally tailor-made in size and shape for an individual case,for best surgical ***,laser additive manufacturing(LAM),with the advent of sophisticated laser systems and software,is an ideal process to solve these *** this paper,we reviewed the progress in LAM of biodegradable Mg-based alloys for biomedical *** effect of powder properties and laser processing parameter on the formability and quality was thoroughly *** microstructure,phase constituents and metallurgical defects formed in the LAMed samples were *** mechanical properties,corrosion resistance,biocompatibility and antibacterial properties of the LAMed samples were summarized and compared with samples fabricated by

关键词： Laser additive manufacturing Magnesium alloys implant Biomedical applications Mechanical properties Biodegradability

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Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reac.ion and semipinacol rearrangement for the biosynthesis of spiro polycyc.ic alkaloids

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Science c.ina chemistry 2025年第01期 288-296页

作者： Shuai Liu Wen-Qiang Xu Ying-Tong Di man-cheng Tang Ding-Kang chen Ming-Ming cao Yao-Wen chang Hong-Yu Tang chun-Mao Yuan Jun-Bo Yang Zhi-Li Zuo Han Guo Zi-Fei Xu Ying Zeng Yun-Dong wu Xiao-Jiang Hao Key Laboratory of Phytochemistry and Natural Medicines (c.inese Academy of Sciences) Kunming Institute of Botany Chinese Academy of Sciences University of c.inese Academy of Sciences Lab of computational chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen Bay Laboratory State Key Laboratory of Microbial Metabolism School of Life Sciences & Biotechnology Shanghai Jiao Tong University State Key Laboratory of Func.ions and Applications of Medicinal Plants Guizhou Medical University Molecular Biology Experimental center Germplasm Bank of Wild Species in Southwest China Kunming Institute of Botany Chinese Academy of Sciences Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of Botany Chinese Academy of Sciences Research Unit of chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical Sciences

in the intricate process of natural product biosynthesis, a metabolon can enhance metabolic flux by associating sequential enzymes. A fungal metabolon, comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G, is identified in the biosynthesis of spiro polycyc.ic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide B. Using notoamide E as a substance, Spe F/Spe G metabolon can control the stereoselec.ivity of its 2,3-epoxidation, followed by hydrogen atom ion at c-17 to generate reac.ive epoxide tau-m A with dienyl iminium unit. Subsequently,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic.inverse-electron-demand Diels-Alder reac.ion and semipinacol rearrangement. This provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

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The effect of the ce content on the oxidative dehydrogenation of propane over crOy-ceO2/γ-Al2O3 catalysts

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c.inese Journal of chemical Engineering 2020年第12期28卷 3035-3043页

作者： cheng Zuo man wu Qingjie Guo Key Laboratory of clean chemical Processing of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China State Key Laboratory of High-efficiency coal Utilization and Green chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

A series of crOy(17.5 wt%)-ceO2(X wt%)/γ-Al2O3 catalysts(X=0,0.5,2,5,8)with various ce contentswere prepared by a wetness impregnation method and were applied to the dehydrogenation of propane to propylene at 550℃ and 0.1 *** prepared catalysts were characterized by BET,H2-TPR,O2-TPD,XPS,XRD,SEM-EDS and Raman *** the prepared catalysts,the 17.5cr-2ce/Al catalyst with the largest amount of lattice oxygen exhibited the best catalytic performance for the dehydrogenation of propane to propylene with lattice *** decreased presence of oxygen defects and reducibility were the factors responsible for the improved dehydrogenation ac.ivity of the *** ceO2 layer could inhibit the evolution of lattice oxygen(O2^−)to electrophilic oxygen species(O2^−),and the oxygen defects on the catalyst surfacewere *** inhibited lattice oxygen evolution prevented the deep oxidation of propane or propylene,the average cOx selec.ivity decreased from 24.41%(17.5cr/Al)to 5.71%(17.5cr-2ce/Al),and the average propylene selec.ivity increased from 60.15%(17.5cr/Al)to 85.05%(17.5cr-2ce/Al).

关键词： Oxidation Selec.ivity Propane Propylene Fluidized-bed Oxygen carrier

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Effect of mineral admixtures and repeated loading on chloride migration through concrete

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第9期11卷 683-690页

作者： wu-man ZHANG Heng-jing BA School of Transportation Science and Engineering Beihang University Beijing 100191 China School of civil Engineering Harbin Institute of Technology Harbin 150006 China

The effect of fly ash (FA) and ground granulated blast furnace slag (GGBFS) on chloride migration through concrete subjected to repeated loading was examined. Portland cement was replaced by three percentages (20%, 30%, and 40%) of mineral admixtures. Five repeated loadings were applied to concrete specimens using a WHY series fully automatic testing mac.ine. The maximum loadings were 40% and 80% of the axial cylinder compressive strength (f′c). chloride migration through concretes was evaluated using the rapid chloride migration test and the chloride concentration in the anode chamber was measured. The results showed that the replacement percentages of mineral admixtures, the curing time and repeated loading had a significant effect on chloride migration through concrete. The transport number of chloride through concrete cured for 28 d increased with increasing FA replacement and markedly decreased with extension of the curing time. 20% and 30% GGBFS replacement decreased the transport number of chloride through concrete, but 40% GGBFS replacement increased the transport number. Five repeated loadings at 40% or 80% f′c.increased the transport number of chloride for all mixes.

关键词： concrete Fly ash (FA) Ground granulated blast furnace slag (GGBFS) chloride migration Repeated loading

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Multi-layer multi-pass fric.ion rolling additive manufacturing of Al alloy:Toward complex large-scale high-performance components

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international Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 425-438页

作者： Haibin Liu Run Hou chenghao wu Ruishan Xie Shujun chen college of Mechanical&Energy Engineering Beijing University of TechnologyBeijing 100124China chongqing Research institute of Beijing University of Technology Chongqing 401121China

At present,the emerging solid-phase fric.ion-based additive manufacturing technology,including fric.ion rolling additive man-ufacturing(FRAM),can only manufacture simple single-pass *** this study,multi-layer multi-pass FRAM-deposited alumin-um alloy samples were successfully prepared using a non-shoulder tool *** material flow behavior and microstructure of the over-lapped zone between adjacent layers and passes during multi-layer multi-pass FRAM deposition were studied using the hybrid 6061 and 5052 aluminum *** results showed that a mechanical interloc.ing structure was formed between the adjacent layers and the adja-cent passes in the overlapped center *** fric.ion and rolling of the tool head led to different degrees of lateral flow and plastic deformation of the materials in the overlapped zone,which made the recrystallization degree in the left and right edge zones of the over-lapped zone the highest,followed by the overlapped center zone and the non-overlapped *** tensile strength of the overlapped zone exceeded 90%of that of the single-pass deposition *** is proved that although there are uneven grooves on the surface of the over-lapping area during multi-layer and multi-pass deposition,they can be filled by the flow of materials during the deposition of the next lay-er,thus ensuring the dense microstructure and excellent mechanical properties of the overlapping *** multi-layer multi-pass FRAM deposition overcomes the limitation of deposition width and lays the foundation for the future deposition of large-scale high-performance components.

关键词： aluminum alloy additive manufacturing solid-state fric.ion stir welding multi-layer multi-pass

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Synergistic Ru/RuO_(2) heterojunc.ions stabilized by carbon coating as efficient and stable bifunc.ional electrocatalysts for acidic overall water splitting

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Nano Research 2024年第8期17卷 6931-6939页

作者： man wu Yuying Fan Yang Huang Dongxu Wang Ying Xie Aiping wu chungui Tian Key Laboratory of Func.ional inorganic Material chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080China

The development of highly ac.ive and stable acidic water oxidation electrocatalysts is of great significant for promoting the industrial application of proton exchange membrane ***-based catalysts have broad application prospects in acidic water oxidation,but their limitations in stability and ac.ivity hinder their further ***,a nitrogen-doped carbon(Nc)coated porous Ru/RuO_(2) heterojunc.ional hollow sphere(Ru/RuO_(2)/Nc.is designed as high-ac.ive and stable bifunc.ional electrocatalyst for acidic oxygen evolution reac.ion(OER)and hydrogen evolution reac.ion(HER).in synthesis,the key is to use mesoporous polydopamine spheres as a template for forming hollow spheres,a source of Nc coating and a reducing agent for forming Ru/RuO_(2) *** Ru/RuO_(2) heterojunc.ion adjusts the electronic structure of Ru ac.ive sites,optimizing the adsorption of intermediate ***,the Nc coating and the interac.ion between Nc and Ru/RuO_(2) effec.ively prevent Ru from over-oxidation and *** porous hollow structure provides more exposed ac.ive sites and promotes mass ***,Ru/RuO_(2)/Nc exhibits outstanding OER and HER performance with low overpotentials of 211 and 32 mV at 10 mA·cm^(−2),respec.ively,and shows excellent *** acid water splitting electrolyzer,based on the bifunc.ional Ru/RuO_(2)/Nc,requires low cell voltages of 1.46 and 1.76 V at 10 and 100 mA·cm^(−2),respec.ively,with good stability for over 100 h operation,surpassing Pt/c||RuO_(2) and most of the reported catalysts.

关键词： hollow heterojunc.ion bifunc.ional electrocatalysts oxygen evolution hydrogen evolution acidic water splitting

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Synthesis and enhanced piezoelectric response of cVD-grown SnSe layered nanosheets for flexible nanogenerators

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Nano Research 2023年第9期16卷 11839-11845页

作者： Fumei Yang man-chung Wong Jianfeng Mao Zehan wu Jianhua Hao Department of Applied Physics the Hong Kong Polytechnic UniversityHong Kong 999077China

Piezoelectricity is the electric charge which accumulates in certain materials in response to mechanical stimuli,while piezoelectric nanogenerators(PENGs)converting mechanical energy into electricity can be widely used for energy harvesting and self-powered *** group iV-Vi monochalcogenides may exhibit strong piezoelectricity because of their puckered c_(2v)symmetry and electronic structure,making them promising for flexible ***,we investigated the synthesis and piezoelectric properties of multilayer SnSe nanosheets grown by chemical vapor deposition(cVD).The SnSe nanosheets exhibited high single-crystallinity,large area,and good *** strong layer-dependent in-plane piezoelectric coefficient of SnSe nanosheets showed a saturated trend to be~110 pm/V,which overcomes the weak piezoelectric response or odd-even effects in other layered nanosheets.A high energy conversion efficiency of 9.3%and a maximum power density of 538 mW/cm^(2)at 1.03%strain have been demonstrated in a SnSe-based *** on the enhanced piezoelectricity of SnSe and attrac.ive output performance of the nanogenerator,a self-powered sensor for human motion monitoring is further *** results demonstrate the strong piezoelectricity in high quality cVD-grown SnSe nanosheets,allowing for application in flexible smart piezoelectric sensors and advanced microelectromechanical devices.

关键词： SnSe piezotronics piezoresponse force microscope piezoelectric nanogenerator self-powered device

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influence of temperature on performance of anaerobic digestion of municipal solid waste

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Journal of Environmental Sciences 2006年第4期18卷 810-815页

作者： ZHANG Ji-shi SUN Ke-wei wu man-chang ZHANG Lei National Engineering Research center of Solid Waste Resource Recovery Kunming 650033 China Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming 650093 China

The influence of temperature on the performance of anaerobic reactors for treating the organic frac.ion of municipal sohd waste （OFMSW） was studied. Batch digestion of OFMSW was carded out for 32 d at different temperature （25℃, 35℃, 45℃ and 55℃） conditions for total solid concentrations （TS） 17% with the ratio of total organic carbon to nitrogen （c/N） being, 25：1 respec.ively, while keeping other parameters constant such as inoculum, start-up pH, reactor volume （2 L） and so on. Temperature can influence the methanogenic bacteria ac.ivity, accordingly inhibiting the OFMSW biodegradation and stabilization efficiency. Anaerobic reactors excelled at TS reduc.ion, total volatile solid reduc.ion, chemical oxygen demand reduc.ion, increasing cumulative biogas produc.ion, whose rate was at temperature （35℃ and 55℃） conditions. Methane concentration in the biogas was above 65% in four reactors. in addition, the fluctuation of temperatures resulted in the biogas produc.ion variation. The data obtained indicated that temperature had a significant influence on anaerobic process.

关键词： municipal solid waste anaerobic digestion batch processing temperature

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Morphology and strain control of hierarc.ical cobalt oxide nanowire electrocatalysts via solvent effect

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Nano Research 2020年第11期13卷 3130-3136页

作者： Xiuming Bu Xiongyi Liang Kingsley O.Egbo Zebiao Li You Meng Quan Quan Yang Yang Li Kin man Yu c.i-man lawrenc. wu Johnny c.Ho Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SARChina Department of Physics City University of Hong KongKowloonHong KongKowloonHong Kong SARChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SARChina

Designing highly efficient and low-cost electrocatalysts for oxygen evolution reac.ion is important for many renewable energy *** particular,strain engineering has been demonstrated as a powerful strategy to enhance the electrochemical performance of catalysts;however,the required complex catalyst preparation process restricts the implementation of strain ***,we report a simple self-template method to prepare hierarc.ical porous co_(3)O_(4)nanowires(PNWs)with tunable compressive strain via thermal-oxidation-transformation of easily prepared oxalic acid-cobalt nitrate(co(NO_(3))_(2))composite *** on the complementary theoretical and experimental studies,the selec.ion of proper solvents in the catalyst preparation is not only vital for the hierarc.ical structural evolution of co_(3)O_(4) but also for regulating their compressive surface *** of the rich surface ac.ive sites and optimized electronic co d band centers,the PNWs exhibit the excellent ac.ivity and stability for oxygen evolution reac.ion,delivering a low overpotential of 319 mV at 10 mA·cm^(−2)in 1 M KOH with a mass loading 0.553 mg·cm^(−2),which is even better than the noble metal catalyst of RuO_(2).This work provides a cost-effec.ive example of porous co_(3)O_(4)nanowire preparation as well as a promising method for modification of surface strain for the enhanced electrochemical performance.

关键词： hierarc.ical structure morphology control compressive strain solvent effect oxygen evolution reac.ion

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Synthesis and characterization of Sphere-like Pt Nanoparticles Supported on DWcNT/WO_3 Nanorods with Electrocatalytic Ac.ivity

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Journal of Materials Science & Technology 2015年第9期31卷 888-894页

作者： Yanhong Yin chun'an Ma Ziping wu man Zhao Litao chen Youqun chu State Key Laboratory Breeding Base for Green chemistry Synthesis Technology International Science & Technology Cooperation Base of Energy Materials and Application College of Chemical Engineering Zhejiang University of Technology Engineering Research center of High-efficiency Development and Application Technology of Tungsten Resources (Ministry of Education) School of Materials Science and Engineering Jiangxi University of Science and Technology

Tungsten oxide （WO3） nanorods, which were used to load platinum （Pt） nanoparticles, were investi- gated. H2WO4 nanorods with diameters from 10 to 50 nm were obtained when tungsten precursor was added into homogenous double-walled carbon nanotubes （DWcNT） and ethylene glycol （EG） solution. Nanosized rod-like WO3 were ac.ieved after calcination of the DWcNT/H2W04 composite. Sphere-like Pt nanoparticles were loaded on the surface of the nanorods by EG in-situ reduc.ion. Pt particles were isolated by DWcNT/WO3 nanorods and secondary accumulation could be prevented when Pt particles appeared in the DWcNT/WO3 nanorod/EG dispersion solution. Therefore, Pt nanoparticles with mean di- ameters of 2-6 nm could be obtained. Pt-deposited on DWcNT/WO3 nanorods exhibited high electrochemical ac.ivity, which could facilitate the low-cost mass produc.ion of Pt catalyst.

关键词： PlatinumTungsten oxideDouble-walled carbon nanotubesNanorodsElectrocatalysis

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