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Synthesis of straight-chain C_(49)H_(100) alkane using a modular splicing strategy

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Journal of Energy Chemistry 2024年第5期92卷 414-421页

作者： bing ma Jingqing Tian Xueling Lang Shutao lei Bolong Li Chen Zhao Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China School of materials Science and Engineering Nankai UniversityTianjin 300350China

Ultra-long n-alkanes are highly valuable in both scientific research and as major constituents of specialty high-melting-point waxes.Unlike conventional methods(e.g.,Fischer–Tropsch(FT),ethylene oligomerization,and polyethylene cracking)typically resulting in wide n-alkane distributions,the elaborate design strategy presented herein allows the direct synthesis of pure,long n-alkanes using a modular splicing method with acetone,furfural,and fatty acid anhydrides or acyl chlorides as bio-blocks.The herein approach is based on a simple four-step catalytic reaction scheme involving C–C chain elongation and C–O bond activation.The synthesized pure n-alkanes had a carbon chain length as high as C_(49)(total yield of 49%).The synthesis approach also allows to selectively prepare n-alkanes with even and odd carbon numbers ranging from C15 to C_(49).This process represents a great breakthrough in the synthesis of long-chain pure n-alkanes,surpassing the carbon number limitations reported in previous methodologies.

关键词： Straight-chain alkane Aldol condensation F-Cacylation Hydrodeoxygenation

Enhanced electron transport through two-dimensional Ti_(3)C_(2) in dye-sensitized solar cells

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Rare Metals 2022年第9期41卷 3078-3085页

作者： Gang Wang Li-Jiao ma bing-Xin lei Heng Wu Zhao-Qing Liu Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province Key Laboratory of Electrochemical Energy Storage and Light Energy Conversion Materials of Haikou CitySchool of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou571158China School of materials and Environment Guangxi University for NationalitiesNanning530006China Guangzhou Key Laboratory for Clean Energy and materials Huangpu Hydrogen Innovation CenterInstitute of Clean Energy and MaterialsSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou510006China

Two-dimensional(2D)Ti_(3)C_(2) material has a wide range of photovoltaic applications due to its unique electronic,optical,and plasmonic properties.Herein,we present a series of Ti_(3)C_(2)(0,0.6,0.8;wt%)nanosheets-modified P25 nanoparticles as photoanode films for dye-sensitized solar cells(DSSCs).The DSSC based on P25 and 0.6 wt%Ti_(3)C_(2) photoanode achieves a fairly good efficiency(9.22%),which greatly exceeds the counterpart based on the pure P25(7.16%).Benefiting from high light scattering and metallic electrical conductivity of Ti_(3)C_(2) additive,the P25/Ti_(3)C_(2)-based DSSC exhibits a superior behavior of controlling photogenerated charge recombination compared with pure P25 one.

关键词： Ti3C2 Conductivity Charge transfer Dyesensitized solar cells

Numerical study of dynamic zigzag patterns in migrating epithelial tissue

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Science China(Physics,Mechanics & Astronomy) 2022年第1期65卷 45-52页

作者： Li-bing Cai Wenjie Ji Jie Luo Qun-li lei Yu-qiang ma National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Physical Science and Technology Soochow UniversitySuzhou 215006China

Collective cell migration plays a crucial role in embryonic development, metastasis, and wound healing. Nevertheless, to the best of our knowledge, how the coordination between the cell motility and deformations affects the collective motion of epithelial cells is not fully understood. In this work, we propose a modified self-propelled Voronoi model for epithelial cell migration incorporating the coupling between the self-propulsion of cells and the polarization of the cell elongation. At a high coupling strength,we observe the emergence of backward traveling band structures formed by highly aligned cells, which can be regulated by cell elongations or shape anisotropy. Increasing the cell shape anisotropy, we find that large bands split into multiple small microbands. The latter essentially forms a dynamic zigzag pattern, in which the angle between the polarization direction of the bands and the migration direction switches alternatively between π/4 and-π/4 because the cells are forced to move preferentially in the anterior direction. We also analyzed the disclinations in the cell monolayer, force distribution near the domain boundaries and the shape alignment of the epithelial monolayer during the formation of this dynamic pattern. The present findings may further our understanding of stripe pattern formations in living systems and inspire potential designs for cell sorting.

关键词： epithelial tissue collective motion self-propelled Voronoi model zigzag pattern band

Additive manufacturing of Cu-AI-Mn shape memory alloy with enhanced superelasticity

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Rare Metals 2023年第12期42卷 4234-4245页

作者： Meng-Wei Wu Zhuo-Fan Hu bing-bing Yang Ying Tao Rui-Ping Liu Chun-Mei ma lei Zhang Department of materials Science and Engineering China University of Mining&Technology(Beijing)Beijing 100083China School of materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Institute for Advanced materials and Technology University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering University of Alaska FairbanksFairbanks 99775-5905USA

The Cu-based shape memory alloy(Sma)with highly oriented columnar crystals is an ideal candidate for the commercial application,especially the ones obtained through rapid cooling via additive manufacturing method.In this work,Cu_(71)Al_(18)Mn_(11)(at%)shape memory alloy with strongtexture columnar grains was successfully prepared by selective laser melting(SLM).An L27(313)orthogonal array was designed to systematically investigate the effects of laser power,scanning speed,scanning spacing,layer thickness and their interactions on the forming quality of Cu_(71)Al_(18)Mn_(11)alloys.Cu_(71)Al_(18)Mn_(11)alloys with density of 7.3204 g·cm^(-3)and relative density of 99.18%were successfully prepared when the laser power,scanning speed,scanning distance and layer thickness were 240 W,1000 mm·s^(-1),0.11 mm and 25μm,the transformation onset temperature(Ms),martensite phase transformation termination temperature(Mf),austenite phase transformation onset temperature(AS)and austenite phase transformation termination temperature(Af)are-21.84,-26.04,-15.75 and-12.36℃,respectively.The compression strength and fracture strain along the building direction(BD)were significantly superior to the scanning direction(SD),while the superelasticity of compression along the SD reached 2.50%,which was better than that of2.32%along BD.The mechanical property and superelasticity anisotropy due to the formation of columnar grains and texture were discussed.This study shows that SLM is a proposed method for the preparation of Cu-Al-Mn Smas with high superelasticity,which provides a new strategy for enhancing the shape memory alloy superelasticity.

关键词： Shape memory alloy(Sma) Selective laser melting(SLM) Columnar grains Superelasticity properties

Analysis of Crystallization Behavior of Mold Fluxes Containing TiO_2 Using Single Hot Thermocouple Technique

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Journal of Iron and Steel Research(International) 2016年第4期23卷 322-328页

作者： Yun lei bing XIE Wen-hui ma State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology College of materials Science and Engineering Chongqing University

The crystallization behavior of mold fluxes containing 0-8 mass% TiO2 was investigated using the single hot therrnocouple technique （SHTT） and X ray diffraction （XRD） to study the possible effects on the coordination of heat transfer control and strand lubrication for casting crack sensitive peritectic steels. Time-temperature-transforma tion （TTT） and continuous-cooling transformation （CCT） curves were plotted using the data obtained from SHTT to characterize the crystallization of the mold fluxes. The results showed that crystallization of the mold fluxes during isothermal and non-isothermal processes was suppressed with TiO2 addition. From the TTT curves, it could be seen that the incubation and growth time of crystallization increased significantly with TiO2 addition. The CCT curves showed that the crystallization temperature initially decreased, and then suddenly increased with increasing the TiO2 content. XRD analysis suggested the presence of cuspidine in the mold fluxes with lower TiO2 content （〈4 mass%） , while both perovskite and cuspidine were detected in the mold fluxes when the TiO2 content was increased to 8 mass%. In addition, the growth mechanisms of the crystals changed during the isothermal crystallization process from interface controlled growth to diffusion-controlled growth with increasing the TiO2 content.

关键词： mold flux single hot thermocouple technique kinetics crystallization TTT curve CCT curve

TRP (transient receptor potential) ion channel family:structures, biological functions and therapeutic interventions for diseases

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Signal Transduction and Targeted Therapy 2023年第8期8卷 3584-3621页

作者： Miao Zhang Yueming ma Xianglu Ye Ning Zhang lei Pan bing Wang School of Pharmacy Shanghai University of Traditional Chinese MedicineShanghai 201203China Experiment Center for Science and Technology Shanghai University of Traditional Chinese MedicineShanghai 201203China The Center for Microbes Development and HealthKey Laboratory of Molecular Virology and ImmunologyInstitut Pasteur of ShanghaiChinese Academy of SciencesShanghai 200031China Institute of Interdisciplinary Integrative Medicine Research Shanghai University of Traditional Chinese MedicineShanghai 201203China CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing 100049China Center for Pharmaceutics Research Shanghai Institute of Materia Medica Chinese Academy of SciencesShanghai 201203China

Transient receptor potential(TRP)channels are sensors for a variety of cellular and environmental signals.mammals express a total of 28 different TRP channel proteins,which can be divided into seven subfamilies based on amino acid sequence homology:TRPA(Ankyrin),TRPC(Canonical),TRPM(Melastatin),TRPML(Mucolipin),TRPN(NO-mechano-potential,NOMP),TRPP(Polycystin),TRPV(Vanilloid).They are a class of ion channels found in numerous tissues and cell types and are permeable to a wide range of cations such as Ca^(2+),Mg^(2+),Na^(+),K^(+),and others.TRP channels are responsible for various sensory responses including heat,cold,pain,stress,vision and taste and can be activated by a number of stimuli.Their predominantly location on the cell surface,their interaction with numerous physiological signaling pathways,and the unique crystal structure of TRP channels make TRPs attractive drug targets and implicate them in the treatment of a wide range of diseases.Here,we review the history of TRP channel discovery,summarize the structures and functions of the TRP ion channel family,and highlight the current understanding of the role of TRP channels in the pathogenesis of human disease.Most importantly,we describe TRP channel-related drug discovery,therapeutic interventions for diseases and the limitations of targeting TRP channels in potential clinical applications.

关键词： channel functions transient

Enhancement the Adhesion between Epoxy Coating and Rusted Structural Steel by Tannic Acid Treatment

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Acta Metallurgica Sinica(English Letters) 2014年第6期27卷 1105-1113页

作者： Yang Li Yuantai ma Bin Zhang bing lei Ying Li State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences

An eco-friendly rust converter treatment based on tannic acid was optimized by orthogonal experiment, and the adhesion of the epoxy top-coating system was evaluated. The results showed that the adhesion between the epoxy coating and the rusted steel after treatment was enhanced from 1.93 to 5.97 MPa. This adhesion improvement was attributed to the formation of the micro-cracked tannic conversion layer and the increase of the compactness of the rust layer. The failure analysis suggested that the remainder rust was still the key issue for the further adhesion improvement of the coating system.

关键词： Tannic acid Rust Adhesion Orthogonal experiment SEM FTIR

Effect of Mg addition on temper embrittlement in 2.25Cr–1Mo steel doped with 0.056% P–Mg segregation behavior at grain boundary

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Journal of Iron and Steel Research(International) 2021年第10期28卷 1259-1267页

作者： Xiao-bing Li Xin Dong Peng-xiang Zhao Wei-wei Xing lei-lei Ding Nan-nan Zhang Ying-che ma Kui Liu Shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of ScienceShenyang110016LiaoningChina CAS Key Laboratory of Nuclear materials and Safety Assessment Shenyang110014LiaoningChina School of materials Science and Engineering Shenyang University of TechnologyShenyang110870LiaoningChina School of materials Science and Engineering University of Science and Technology of ChinaHefei230026AnhuiChina

To verify the microalloying function and segregation behavior of trace Mg at grain boundary in steel,the 2.25Cr–1Mo steel doped with 0.056%P containing different Mg contents was refined with a vacuum-induction furnace.The effects of trace Mg addition on the temper embrittlement susceptibility of 2.25Cr–1Mo steel were studied by step-cooling test and the segregation behavior of Mg at grain boundary was explored by Auger electron spectroscopy.It is shown that P-induced temper embrittlement susceptibility can be reduced after subjecting to step-cooling treatment with trace Mg addition,mainly benefited from the segregation of Mg at grain boundary.This segregation can decrease the segregation amounts of P and S,especially for P,and increase the grain boundary cohesion,reducing the adverse effect on temper embrittlement caused by P and S.

关键词： 2.25Cr-1Mo steel Temper embrittlement Mg P Segregation Auger electron spectroscopy

Concurrent adsorption and reduction of chromium(Ⅵ)to chromium(Ⅲ)using nitrogen-doped porous carbon adsorbent derived from loofah sponge

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Frontiers of Environmental Science & Engineering 2022年第5期16卷 27-37页

作者： Feng Chen Shihao Guo Yihao Wang Lulu ma bing Li Zhimin Song lei Huang Wen Zhang School of Environmental and Biological Engineering Henan University of EngineeringZhengzhou 451191China School of Environmental Science and Engineering Guangzhou UniversityGuangzhou 510006China Guangzhou University-Linköping University Research Center on Urban Sustainable Development Guangzhou UniversityGuangzhou 510006China John A.Reif Jr.Department of Civil and Environmental EngineeringNew Jersey Institute of TechnologyNewarkNJ 07102USA

To develop highly effective adsorbents for chromium removal,a nitrogen-doped biomass-derived carbon(NHPC)was synthesized via direct carbonation of loofah sponge followed by alkali activation and doping modification.NHPC possessed a hierarchical micro-/mesoporous lamellar structure with nitrogen-containing functional groups(1.33 at%),specific surface area(1792.47 m2/g),and pore volume(1.18 cm^(3)/g).NHPC exhibited a higher Cr(Ⅵ)adsorption affinity than the HPC(without nitrogen doping)or the pristine loofah sponge carbon(LSC)did.The influence of process parameters,including pH,dosage,time,temperature,and Cr(Ⅵ)concentration,on Cr(Ⅵ)adsorption by NHPC were evaluated.The Cr(Ⅵ)adsorption kinetics matched with the pseudo-second-order model(R^(2)≥0.9983).The Cr(Ⅵ)adsorption isotherm was fitted with the Langmuir isotherm model,which indicated the maximum Cr(Ⅵ)adsorption capacities:227.27,238.10,and 285.71 mg/g at 298K,308K,and 318K,respectively.The model analysis also indicated that adsorption of Cr(Ⅵ)on NHPC was a spontaneous,endothermal,and entropy-increasing process.The Cr(Ⅵ)adsorption process potentially involved mixed reductive and adsorbed mechanism.Furthermore,computational chemistry calculations revealed that the adsorption energy between NHPC and Cr(VI)(-0.84 eV)was lower than that of HPC(-0.51 eV),suggesting that nitrogen doping could greatly enhance the interaction between NHPC and Cr(VI).

关键词： Chromium(Ⅵ) Nitrogen-doped porous carbon Adsorption Reduction Loofah sponge