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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 961-974页

作者： you lv Chao Zhang Yupeng Zhang Qishi Wang Xinxin Zhang Zehua Dong Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hubei Engineering Research Centre for Biomaterials and Medical Protective Materials Huazhong University of Science and TechnologyWuhan 430074China China Railway Major Bridge Engineering Group Material and Equipment Supply Co.Ltd.Wuhan 430000China

The wide application of Mg is hindered by its low corrosion resistance,especially for recycled *** this work,a novel plasma electrolytic oxidation(PEO)process was conducted on a recycled Mg alloy with a high content of Al(~2.3 wt%),which results in a polycrystalline PEO *** PEO coating displays a three-layered structure with a uniform elemental *** the outer layer decorated by channels of micrometre scales,the middle layer mainly contains submicronsized pores associated with plasma discharges,whereas the fine pores originated from oxygen evolution were detected in the inner *** electrochemical measurements,hydrogen evolution tests and salt spray tests were conducted,indicating the superior corrosion resistance of PEO-coated recycled Mg ***,the purposed PEO method could dramatically enhance the corrosion resistance of recycled Mg,which may broaden its application in the future.

关键词： Recycled Mg Plasma electrolytic oxidation Corrosion resistance Layered structure

Effect of Mn Addition and Heat Treatment on the Corrosion Behaviour of Mg-Ag-Mn Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 665-677页

作者： you lv Yupeng Zhang Xi Liu Zehua Dong Xiaorong Zhou Xinxin Zhang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074China Hubei Engineering Research Centre for Biomaterials and Medical Protective Materials Huazhong University of Science and TechnologyWuhan430074China Corrosion and Protection Centre Department of MaterialsThe University of ManchesterManchesterM139PLUK

The high corrosion sensitivity and the potential bio-toxicity of Mg-Ag alloys limit their wide applications for the production of implanted devices. In the present work, Mn is added into the Mg-Ag alloy to optimize its corrosion behaviour. The corrosion behaviour of Mg-Ag-Mn alloys is investigated with the underlying microstructural factors examined. The Mg-Ag alloy with 2 wt% Mn exhibits the highest corrosion resistance after post-casting heat treatment at 440 ℃. The addition of Mn results in α-Mn phase with the incorporation of Fe, which suppresses the cathodic activity of impurity Fe. Further, heat treatment of the cast alloys homogenizes the distribution of Ag and promotes the precipitation of α-Mn phase. The former removes Ag segregations as potential cathodes;the latter promotes a more uniform distribution of cathodes and, therefore, prevents localized corrosion.

关键词： Mg-Ag alloy Mn addition Post-casting heat treatment Cathodic activity Corrosion mechanism

Structure and Properties of Gel-spun Ultra-high Molecular Weight Polyethylene Fibers with High Gel Solution Concentration

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Chinese Journal of Polymer Science 2017年第4期35卷 524-533页

作者： Min-fang An you lv Hao-jun Xu Qun-Gu 王宗宝 Ningbo Key Laboratory of Specialty Polymers Faculty of Materials Science and Chemical Engineering Ningbo University Ningbo 315211 China College of Material Engineering Ningbo University of Technology Ningbo 315211 China

The gel-spun ultra-high molecular weight polyethylene （UHMWPE） fibers were prepared at the industrial production line with different gel solution concentrations of 15 wt%, 18 wt% and 24 wt%. The difference in ultimate structure and mechanical properties of UHMWPE fibers for different gel solution concentrations were analyzed by tensile testing, differential scanning calorimetry （DSC）, wide angle X-ray diffraction （WAXD） and small angle X-ray scattering （SAXS）. With the increase of gel solution concentration, the ultimate mechanical properties of UHMWPE fibers were decreased and the crystallization and orientation of UHMWPE fibers became inferior. Besides, both the average shish length （（Lshsh）） and shish misorientation （B0） of UHMWPE fibers were decreased with the increase of gel solution concentration. In addition, the appropriate increase of spinning temperature led to the further optimization of the ultimate structure and mechanical properties of UHMWPE fibers.

关键词： UHMWPE fibers Gel solution concentration Orientation Crystallization Shish structure

Induced transformation of antimony trioxide by Mn(II) oxidation and their co-transformed mechanism

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Journal of Environmental Sciences 2023年第7期129卷 69-78页

作者： you lv Caixiang Zhang Chao Nan Zenghui Fan Shuxin Huang State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science Wuhan 430074China

Antimony(Sb)is a toxic and carcinogenic element that often enters soil in the form of antimony trioxide(Sb_(2)O_(3))and coexists with manganese(Mn)in weakly alkaline *** oxides such as birnessite have been found to promote the oxidative dissolution of Sb_(2)O_(3),but few researches concerned the co-transformations of Sb_(2)O_(3) and Mn(II)in *** study investigated themutual effect of abiotic oxidation of Mn(II)and the coupled oxidative dissolution of Sb_(2)O_(3).The influencing factors,such as Mn(II)concentrations,pH and oxygen were also ***,their co-transformed mechanism was also explored based on the analysis of Mn(II)oxidation products with or without Sb_(2)O_(3) using XRD,SEM and *** results showed that the oxidative dissolution of Sb_(2)O_(3) was enhanced under higher pH and higher Mn(II)*** a lower Mn(II)concentration such as 0.01 mmol/L Mn(II)at pH 9.0,the improved dissolution of Sb_(2)O_(3) was attributed to the generation of dissolved intermediate Mn(III)species with strong oxidation ***,under higher Mn(II)concentrations,both amorphous Mn(III)oxides and intermediate Mn(III)species were responsible for promoting the oxidative dissolution of Sb_(2)O_(3).Most released Sb(∼72%)was immobilized by Mn oxides and Sb(V)was dominant in the adsorbed and dissolved total ***,the presence of Sb_(2)O_(3) not only inhibited the removal of Mn(II)by reducing Mn(III)to Mn(II)but also affected the final products of Mn *** example,amorphous Mn oxides were formed instead of crystalline Mn(III)oxides,such as ***,rhodochrosite(MnCO_(3))was formed with the high Mn(II)/Sb_(2)O_(3) ratio,but without being observed in the low Mn(II)/Sb_(2)O_(3) *** results of study could help provide more understanding about the fate of Sb in the environment and the redox transformation of Mn.

关键词： Antimony trioxide Mn(II)oxidation Oxidative dissolution Co-transformed mechanism

Characterization of Structural Knot Distributions in UHMWPE Fibers

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Chinese Journal of Polymer Science 2016年第5期34卷 606-615页

作者： Hao-jun Xu Min-fang An you lv 王宗宝 Qun Gu Ningbo Key Laboratory of Specialty Polymers Faculty of Materials Sctence and Chemical Engineering Ningbo University Ningbo 315211 China College of Material Engineering Ningbo University of Technology Ningbo 315211 China

Microbeam wide-angle X-ray diffraction（WAXD） experiments were carried out at different structural knot positions of SIOC and M4 fibers of ultra-high molecular weight polyethylene（UHMWPE）. The optical microscope images revealed that SIOC fiber had bamboo-like structural knots, and M4 fiber had chaotic distribution of structural knots. WAXD patterns showed the monoclinic unit cell in the whole M4 fiber, but different lamellar orientations in the bamboo joint of SIOC fiber. In addition, small-angle X-ray scattering（SAXS） patterns confirmed that the SIOC fiber contained uniform distribution of shish structures, and differential scanning calorimetry（DSC） measurements showed that its less branched and short chains benefited the orthorhombic-hexagonal phase transformation.

关键词： UHMWPE shish hexagonal calorimetry SAXS lamellar bamboo crystalline chains WAXD

A designed locked nucleic acid-based nanopore for discriminating ctDNA and its coexisting analogue ncDNA

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Chinese Chemical Letters 2020年第1期31卷 172-176页

作者： Yuqin Huang you lv Jia Geng Dan Xiao Cuisong Zhou College of Chemistry Sichuan UniversityChengdu 610064China Department of Laboratory Medicine State Key Laboratory of BiotherapyWest China HospitalSichuan University and Collaborative Innovation Center for BiotherapyChengdu 610041China

Circulating tumor DNA(ctDNA),carrying tumor-specific sequence mutations,is a promising biomarker for classification,diagnosis and prognosis of ***,there is still a great challenge in discriminating single-base difference between ctDNA and its coexisting analogue(normal circulating DNA,ncDNA)at a serum sample.A locked nucleic acid(LNA)probe combined with a-HL nanopore sensor was designed,which achieved a high signal-to-background ratio(SBR)of^8.34 × 10^3,as well as a significant discrimination capability(~12.3 times)of single-base diffe *** accurate discrimination strategy is label-free,convenient,selective and sensitive,which has great potential in the early diagnosis of diseases and biomedical research fields.

关键词： Single-base difference Simultaneous discrimination Nanopore Circulating tumor DNA Locked nucleic acid

A Synchrotron in situ X-ray Study on the Multiple Melting Behaviors of Isomorphous Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(P(HB-co-HV))with Middle HV Content

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Chinese Journal of Polymer Science 2020年第9期38卷 1015-1024,I0008页

作者： Hao Zhu you lv Dan Shi Yi-Guo Li Wei-Jun Miao Zong-Bao Wang Ningbo Key Laboratory of Specialty Polymers State Key Laboratory Base of Novel Functional Materials and Preparation ScienceFaculty of Materials Science and Chemical EngineeringNingbo UniversityNingbo 315211China

The multiple endothermic peaks without observable recrystallization phenomenon of isomorphous poly(3-hydroxybutyrate-co-3-hydroxyvalerate)[P(HB-co-HV)]with the middle HV content of 19.4 mol%and 28.7 mol%were confirmed by differential scanning calorimetry(DSC),and the evolutions of crystal structure and lamellar morphology in the heating and melting process were tracked by in situ synchrotron wide angle X-ray diffraction(WAXD)and small angle X-ray scattering(SAXS)*** emergence of asymmetric features of both the diffraction peaks and scattering curves indicates the coexistence of different lamellar crystals with varied unit cell *** on the in situ WAXD and SAXS measurements,we calculated the evolutions of the unit cell parameters a and b as well as the long period and lamellar thickness upon *** comparative analysis of WAXD and SAXS data confirms that the multiple endothermic peaks of P(HB-co-19.4%HV)and P(HB-co-28.7%HV)result from the melting of different lamellae rather than the melting/*** thinner,unstable uniform lamellae with HV counits total inclusion melt first and the thicker,stable sandwich lamellae with HV counits partial inclusion melt *** addition,the large second melting peak in P(H B-co-19.4%HV),differing from that of samples with HV content of 28.7 mol%and 36.2 mol%,is due to the unique state of HV content leading to a transition of sandwich lamellae to uniform *** present study establishes the relationship between the different lamellae structure and multiple melting behaviors of isomorphous copolymer.

关键词： P(HB-co-HV) Isomorphous Middle HV content Synchrotron radiation

Multiple Endothermic Peaks Resulted from Different Crystal Structures in an Isomorphous Copolymer Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

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Chinese Journal of Polymer Science 2016年第12期34卷 1510-1522页

作者： you lv Hao Zhu Min-fang An Hao-jun Xu Li Zhang 王宗宝 Ningbo Key Laboratory of Specialty Polymers Faculty of Materials Science and Chemical EngineeringNingbo UniversityNingbo 315211China

The multiple endothermic peaks of poly（3-hydroxybutyrate-co-3-hydroxyvalerate）（P（HB-co-HV）） in differential scanning calorimetry （DSC） results, as one representative phenomenon of polymer with unique cocrystallization behavior, were generally considered as the results of melting/recrystallization. In this study, wide angle X-ray diffraction （WAXD） and small angle X-ray scattering （SAXS） experiments were conducted to analyze the phenomena of multiple endothermic peaks in DSC results. The results of these analyses indicated that the multiple endotherms were mainly caused by different lamellae structures. For P（HB-co-HV） with lower HV content, it was comprised of two structures of HV total exclusion and HV partial inclusion in the crystal lamellae. For P（HB-co-HV） with higher HV content, it was also comprised of two structures of HV total inclusion and HV partial inclusion in the crystal lamellae. However, only structure with HV partial inclusion in the crystal lamellae remained existing after first melting peak for all samples.

关键词： P(HB-co-HV) Isodimorphism Multiple endotherms Uniform lamellae Sandwich lamellae.

The Simultaneous Three-channel Multicolor CCD Photometric System of the 1.2 m Telescope at Jilin Astronomical Observatory

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Research in Astronomy and Astrophysics 2022年第5期22卷 75-86页

作者： Bing-Li Niu Cheng-Zhi Liu Zhen-Wei Li Zhe Kang you lv Changchun Observatory National Astronomical ObservatoriesUniversity of Chinese Academy of SciencesChangchun 130117China University of the Chinese Academy of Sciences Beijing 100049China

We will introduce the construction and design of a new simultaneous three-channel multicolor CCD *** photometer has been mounted on the 1.2 m telescope at Jilin Astronomical Observatory,and is applied to study space debris,gamma-ray burst afterglows,asteroids and other rapidly variable *** one of the ground follow-up telescopes of the Chinese-French Space-based multi-band astronomical Variable Objects Monitor(SVOM)mission,it appears very essential to evaluate the performance of the photometry system of this photometer,which can achieve simultaneous imaging within a field of view of 21’.5×21’.5,21’.5×21’.5 and21’.3×21’.3 in the Sloan Digital Sky Survey(SDSS)g’,r’,i’bands,*** calibrations were carried out by using plenty of SDSS standard stars,and the relationship between the photometric system and the Johnson-Bessel filter system was also *** results of the performance evaluation from observing open cluster M67 are presented.

关键词： astronomical instrumentation-photometer-photoelectric photometry