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Reoxidation process and corrosion behavior of TA15 alloy by laser ablation

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Rare Metals 2021年第4期40卷 865-876页

作者： bo-wen liu Gao-Yang Mi Chun-Ming Wang School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

The thermal oxide layer formed of TA15 alloy has poor corrosion *** this paper,the changes of the elements and components on the surface after laser ablation with different energy densities(E) were *** formation process and corrosion behavior of laser-generated oxide layer were *** E increases,the oxygen content decreases from 8.52% to 5.43% and then increases to 11.89%.The surface oxide layer changes from TiO_(2)(R)(i.e.,rutile) to Ti_(2) O_(3)+TiO_(2)(R) and finally becomes TiO_(2)(R)+TiO_(2)(A)(i.e.,anatase).The TiO_(2)(R) gasification was confirmed by calculating the surface temperature *** surface reoxidation process was illustrated by a thermodynamically calculated ΔGT(i.e.,the Gibbs free energy changes with temperature).When E≥17.5 J·cm^(-2),the oxide layer exhibits an agitated morphology,and oxide falls off at the *** E increases,the corrosion rate decreases first and then *** energy density of 8.75 J·cm^(-2),the surface corrosion rate was 20.43 times slower than that of the untreated *** impedance spectrum and equivalent resistance results also prove the best corrosion resistance at 8.75 J·cm^(-2).The corrosion behavior of the oxide layer is analyzed from the properties of the oxide layer components and the reaction products with the electrolyte.

关键词： Laser ablation TA15 alloy Reoxidation process Corrosion behavior Elemental analysis

Structure engineering of cathode host materials for Li-S batteries

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Rare Metals 2024年第4期43卷 1370-1389页

作者： Jia-Jun Long Hua Yu wen-bo liu School of New Energy and Materials Southwest Petroleum UniversityChengdu610500China School of Mechanical Engineering Sichuan UniversityChengdu610065China

Although lithium-sulfur batteries are one of the favorable candidates for next-generation energy storage devices,a few key challenges that have not been addressed have limited its *** challenges include lithium dendrite growth in the anode side,volume change of the active material,poor electrical conductivity,dissolution and migration of poly sulfides,and slow rate of solid-state reactions in the cathode *** the electrochemical performance of lithium-sulfur batteries is greatly affected by the design of the cathode host material,it has also been widely discussed in addressing the abovementioned *** this paper,three design ideas of cathode host materials in terms of microstructure,crystal structure and electronic structure are introduced and ***,the current progress of these three structural design strategies and their effects on the electrochemical performance of lithium-sulfur batteries are discussed in ***,future directions in the structural design of cathode materials for lithium-sulfur batteries are discussed and further perspectives are provided.

关键词： Lithium-sulfur batteries Structure engineering Cathode Host materials

Recent Advances and Perspectives in the Synthesis and Applications of Tetrahydrocarbazol-4-ones

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Chinese Journal of Chemistry 2020年第7期38卷 737-752页

作者： Muhammad Usman Xu-Dong Hu wen-bo liu Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds&Materials(Ministry of Education)College of Chemistry and Molecular SciencesWuhan UniversityWuhanHubei 430072China

Tetrahydrocarbazol-4-one represents a prevalent framework of numerous natural products and *** review summaries the recent synthetic progresses of this core structure,including Fischer indoliation,oxidative and reductive coupling,a-arylative cyclization by means of transition-metal catalysis or under metal-free conditions,and other *** recently emerged enantioselective catalytic methods of tetrahydrocarba20l-4-ones are also *** mechanistic insights and applications of these strategies as a key step in the total(formal)synthesis of complex alkaloids are highlighted as well.

关键词： methods. oxidative catalysis

Multifunctional protective aerogel with superelasticity over−196 to 500℃

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Nano Research 2022年第9期15卷 7797-7805页

作者： bo-wen liu Min Cao Yi-Ying Zhang Yu-Zhong Wang Hai-bo Zhao The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

Protective materials that possess superelasticity and multifunctionality over a broad temperature range are urgently needed in various advanced ***,under harsh work conditions,the performance of current materials may largely deteriorate to lose protective ***,we report a bidirectionally oriented multi-walled carbon nanotubes(MWCNTs)-reinforced chitosan carbon aerogel(CS-MWCNT)that possesses superelasticity,high electromagnetic interference shielding,thermal insulation,and infrared stealth at both low temperatures(such as liquid nitrogen)and high temperatures(such as alcohol flames).Highly oriented lamellar arch structures combined with an MWCNTs-reinforced carbon skeleton act as elastic segments to disperse the stress during compression and endow CS-MWCNT with the ability to recover to almost the original size after being compressed at−196-500℃.The lamellar structures make CS-MWCNT thermally insulating and infrared stealth with a low thermal conductivity of~0.03 W/(m·K).Furthermore,a high electromagnetic interference(EMI)shielding effect of 64 dB is realized via an absorption-dominant EMI shielding mechanism derived from the successive inherently conductive carbon lamella,and the EMI shielding performance is largely maintained after treatment under extreme conditions like low temperature,high temperature,as well as cyclic *** work provides a new strategy for the development of temperature-invariant multifunctional aerogels for harsh environment applications.

关键词： superelasticity electromagnetic interference shielding heat insulation infrared stealth extreme environment

Hierarchical Ti_(3)C_(2)T_(x)@ ZnO Hollow Spheres with Excellent Microwave Absorption Inspired by the Visual Phenomenon of Eyeless Urchins

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Nano-Micro Letters 2022年第5期14卷 62-76页

作者： Yan‑Qin Wang Hai‑bo Zhao Jin‑bo Cheng bo‑wen liu Qiang Fu Yu‑Zhong Wang Collaborative Innovation Center for Eco‑Friendly and Fire‑Safety Polymeric Materials(MoE) State Key Laboratory of Polymer Materials EngineeringNational Engineering Laboratory for Eco‑Friendly Polymer Materials(Sichuan)College of ChemistrySichuan UniversityChengdu 610064People’s Republic of China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065People’s Republic of China

Ingenious microstructure design and rational composition selection are effective approaches to realize high-performance microwave absorbers,and the advancement of biomimetic manufacturing provides a new *** nature,urchins are the animals without eyes but can“see”,because their special structure composed of regular spines and spherical photosensitive bodies“amplifies”the light-receiving ***,inspired by the above phenomenon,the biomimetic urchin-like Ti_(3)C_(2)T_(x)@ZnO hollow microspheres are rationally designed and fabricated,in which ZnO nanoarrays(length:~2.3μm,diameter:~100 nm)as the urchin spines are evenly grafted onto the surface of the Ti_(3)C_(2)T_(x) hollow spheres(diameter:~4.2μm)as the urchin spherical photosensitive *** construction of gradient impedance and hierarchical heterostructures enhance the attenuation of incident electromagnetic *** the EMW loss behavior is further revealed by limited integral simulation calculations,which fully highlights the advantages of the urchin-like *** a result,the Ti_(3)C_(2)T_(x)@ZnO hollow spheres deliver a strong reflection loss of−57.4 dB and broad effective absorption bandwidth of 6.56 GHz,superior to similar *** work provides a new biomimetic strategy for the design and manufacturing of advanced microwave absorbers.

关键词： Bioinspired Hierarchical heterostructures Ti_(3)C_(2)T_(x)MXene ZnO nanoarrays Microwave absorption

Synthesis and MALDI-TOF Characterization of β-CD Core ATRP Initiators and RAFT Chain Transfers with Different Degrees of Substitution

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Chinese Journal of Polymer Science 2015年第1期33卷 36-48页

作者： Yan Xin Hong Wang bo-wen liu 袁金颖 Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of ChemistryTsinghua University

In this paper, three different kinds of β-CD derivatives were synthesized as atom transfer radical polymerization（ATRP） initiator or reversible addition-fragmentation chain transfer polymerization（RAFT） chain transfers. The degree of substitution for each derivative was carefully characterized through 1H-NMR, 13C-NMR spectroscopy and matrix-assisted laser desorption/ionization time of flight mass spectrometry（MALDI-TOF-MS）. The factors influencing the degree of substitution were discussed. Moreover, the comparison between ATRP and RAFT was shown in the polymerization of Nisopropyl acrylamide（NIPAM）.

关键词： β-CD core star polymers MALDI-TOF ATRP initiators RAFT chain transfers GPC

ZnO Surface Passivation with Glucose Enables Simultaneously Improving Efficiency and Stability of Inverted Polymer:Non-fullerene Solar Cells

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Chinese Journal of Polymer Science 2022年第12期40卷 1594-1603,I0007页

作者： bo-wen liu Ze-Rui Li Ling-Peng Yan Jing-bo Guo Qun Luo Chang-Qi Ma School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China i-Lab&Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

The power conversion efficiency(PCE)of polymer solar cells(PSCs)has exceeded 19%due to the rapid progress of photoactive organic materials,including conjugated polymer donors and the matched non-fullerene acceptors(NFAs).Due to the high density of oxygen vacancies and the consequent photocatalytic reactivity of ZnO,structure inverted polymer solar cells with the ZnO electron transport layer(ETL)usually suffer poor device *** this work,the eco-friendly glucose(Glu)is found to simultaneously improve the efficiency and stability of polymer:NFA solar *** the optimal conditions,we achieved improved PCEs from 14.77%to 15.86%for the PM6:Y6 solar *** a PCE improvement was attributed to the improvement in J_(SC) and FF,which is ascribed to the smoother and more hydrophobic surface of the ZnO/Glu surface,thereby enhancing the charge extraction efficiency and inhibiting charge ***,UV-Vis absorption spectra analysis revealed that glucose modification could significantly inhibit the photodegradation of Y6,resulting in a significant improvement in the stability of the device with 92%of its initial PCE after aging for 1250 *** application of natural interface materials in this work brings hope for the commercial application of organic solar cells and provides new ideas for developing new interface materials.

关键词： Polymer solar cells Glucose Surface passivation Charge injection Stability improvement

Chiral discrimination of small substituents in biaryl atropisomer construction:enantioselective synthesis of axially chiral 1-azafluorene via Ni-catalyzed[2+2+2]cycloaddition

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Science China Chemistry 2023年第11期66卷 3148-3153页

作者： Jin-Huang Peng Yu-Qing Zheng Li-Gang Bai wen-bo liu Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials Engineering Research Center of Organosilicon Compounds&Materials(Ministry of Education)College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072China Wuhan University Shenzhen Research Institute Shenzhen 518000China

Construction of axially chiral 1-azafluorenes via nickel-catalyzed[2+2+2]cycloaddition of alkynes and(o-alkynyl)benzyl nitriles is *** strategy enables enantioselective discrimination of two sterically similar ortho substituents,such as H and F,during the construction of tri-ortho-substituted biaryl *** studies including the stereochemistry model and the stability of the atropenantiomers toward racemization are *** unique steric hindrance provided by 1-azafluorene skeleton and the fine chiral cavity of the nickel catalyst are key to achieving high enantioselectivity.

关键词： asymmetric catalysis [2+2+2]cycloaddition nickel catalysis atropisomer heterocycle

Immunological factors in cirrhosis diseases from a bibliometric point of view

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World Journal of Gastroenterology 2023年第24期29卷 3899-3921页

作者： Dan Zhang bo-wen liu Xiao-Qing Liang Fu-Quan liu Department of Interventional Therapy Beijing Shijitan HospitalCapital Medical UniversityBeijing 100038China Department of Oncology Beijing Shijitan HospitalCapital Medical UniversityBeijing 100038China

BACKGROUND Cirrhosis results from persistent liver injury that leads to liver *** factors play important regulatory roles in the development and progression of *** is one of the most commonly used methods for systematic evaluation of a field of *** date,there are no bibliometric studies on the role of immunological factors in *** To provide a comprehensive overview of the knowledge structure and research hotspots of immunological factors in *** We retrieved publications related to immunological factors in cirrhosis between 2003 to 2022 from the Web of Science Core Collection database on December 7,*** search strategy was TS=((Liver Cirrhosis OR hepatic cirrhosis OR liver fibrosis)AND(Immunologic*Factor*OR Immune Factor*OR Immunomodulator*OR Biological Response Modifier*OR Biomodulator*)).Only original articles and reviews were included.A total of 2873 publications were analyzed using indicators of publication and citation metrics,countries,institutes,authors,journals,references,and keywords by CiteSpace and *** A total of 5104 authors from 1173 institutions across 51 countries published 2873 papers on cirrhosis and immunological factors in 281 *** the past 20 years,the increasing number of related annual publications and citations indicates that research on immunological factors in cirrhosis has become the focus of attention and has entered a period of accelerated *** United States(781/27.18%),China(538/18.73%),and Germany(300/10.44%)were the leading countries in this *** of the top 10 authors were from the United States(4)and Germany(3),with Gershwin ME contributing the most related articles(42).World Journal of Gastroenterology was the most productive journal,whereas Hepatology was the most co-cited *** research hotspots regarding immunological factors in cirrhosis include fibrosis,cirrhosis,inflammation,liver fibrosis,expression,hepatocell

关键词： Immunological factors Cirrhosis CiteSpace VOSviewer Bibliometrics Visualization