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Enhanced comprehensive properties of stereolithography 3D printed alumina ceramic cores with high porosities by a powder gradation design

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Journal of Materials Science & Technology 2022年第36期131卷 264-275页

作者： Xiang Li Haijun Su Dong Dong Di Zhao yuan liu Zhonglin Shen Hao Jiang Yinuo Guo Haifang liu Guangrao Fan Wenchao Yang Taiwen Huang Jun Zhang Lin liu Hengzhi Fu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China

Ceramic cores with complex structures and optimized properties are critical for hollow turbine blades applied in *** to traditional methods,additive manufacturing(AM)presents great advantages in forming complex ceramic cores,but how to balance the porosity and strength is an enormous *** this work,alumina ceramic cores with high porosity,moderate strength,and low high-temperature deflection were prepared using stereolithography(SLA)3D printing by a novel powder gradation design *** contradiction between porosity and flexural strength is well adjusted when the mass ratio of the coarse,medium,and fine particles is 2:1:1 and the sintering temperature is 1600℃.The fracture mode of coarse particles in sintered SLA 3D printing ceramic transforms from intergranular fracture to transgranular fracture with the increase of sintering temperature and the proportion of fine powders in powder *** sintered porosity has a greater influence on the high-temperature deflection of SLA 3D printed ceramic cores than grain *** this basis,a"non-skeleton"microstructure model of SLA 3D printed alumina ceramic cores is created to explain the relationship between the sintering process and *** a result,high porosity(36.4%),appropriate strength(50.1 MPa),and low high-temperature deflection(2.27 mm)were achieved by optimizing particle size gradation and sintering process,which provides an insight into the important enhancement of the comprehensive properties of SLA 3D printed ceramic cores.

关键词： Ceramic cores Stereolithography(SLA) Powder gradation design Sintering temperature Comprehensive properties

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Bifunctional sulfonated covalent polymers as the modulator for oriented and highly reversible zinc plating

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Science China Chemistry 2023年第1期66卷 289-296页

作者： meng-Jie Chen Qing-yuan Zhao Hong-Rui Wang Tao Long Xin Ma Qing Wu Wen-Xin Zhou Xiong-Wei Wu Xian-Xiang Zeng School of Chemistry and Materials Science Hunan Agricultural UniversityChangsha 410128China College of Chemistry and Chemical Engineering Hunan Provincial Key Laboratory of Efficient and Clean Utilization of ManganeseResourcesCentral South UniversityChangsha 410083China Information and Network Center Central South UniversityChangsha 410083China

The vast superiority in resource sustainability and volumetric energy density enables metallic zinc(Zn)to construct costeffective and environment-benign battery systems for the energy ***,the problems of Zn dendrites and poor Coulombic efficiency(CE)during cell’s whole life cycle stump its advancement as a rechargeable battery *** solution is to modulate the Zn^(2+) desolvation prior to electro-reduction and subsequent ***,a transferred protection tactic via a bifunctional sulfonated covalent polymer interlayer is proposed to regulate the Zn2+desolvation,which affects the formation of solid-electrolyte interphase,and guides its plating along with preferable(002)crystal ***,the high initial CE of 96.3%and the long-term average CE of 99.8%for 310 cycles are achieved in Zn||Cu cells and 570-h circulation is also realized at 2 mA cm^(-2)/10 mAh cm^(-2)in Zn||Zn ***,Zn||hydrated vanadium oxide-based full batteries with the low-concentration organic electrolytes are also demonstrated with the high specific capacity of 173.8 mAh g^(-1)at 0.5 A g^(-1)and 64%capacity retention over 305 cycles and oriented Zn deposition.

关键词： Zn anode interface chemistry sulfonated covalent polymer oriented plating reversibility

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Structure and magnetic properties of the S=3/2 zigzag spin chain antiferromagnet BaCoTe_(2)O_(7)

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 91-97页

作者： Lisi Li Xunwu Hu Zengjia liu Jia Yu Benyuan Cheng Sihao Deng Lunhua He Kun Cao Dao-Xin Yao meng Wang Center for Neutron Science and Technology School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Shanghai Institute of Laser Plasma Shanghai 201800China Center for High Pressure Science and Technology Advanced Research Shanghai 201203China Spallation Neutron Source Science Center Dongguan 523803China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

We report a study of the structure and magnetic properties of the S=3/2 zigzag spin chain compound BaCoTe_(2)O_(7).Neutron diffraction measurements show that it crystallizes in the noncentrosymmetric space group Ama2 with a canted↑↑↓↓spin structure along the quasi-one-dimensional zigzag chain and a moment size of 1.89(2)μBat 2 *** magnetic susceptibility and specific heat measurements yield an antiferromagnetic phase transition at TN=6.2 K.A negative Curie-Weiss temperature,ΘCW=-74.7(2) K,and an empirical frustration parameter,f=|ΘCW|/TN≈12,are obtained by fitting the magnetic susceptibility,indicating antiferromagnetic interactions and strong magnetic *** ultraviolet-visible absorption spectroscopy and first-principles calculations,an indirect band gap of 2.68(2) eV is *** propose that the canted zigzag spin chain of BaCoTe_(2)O_(7) may produce a change in the polarization via the exchange-striction mechanism.

关键词： antiferromagnet zigzag spin chain magnetic frustration spin structure

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Constructing Pd-N interactions in Pd/g-C_(3)N_(4)to improve the charge dynamics for efficient photocatalytic hydrogen evolution

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Nano Research 2022年第4期15卷 2928-2934页

作者： Xudong Xiao Siying Lin Liping Zhang Huiyuan meng Jing Zhou Qi Li Jianan liu Panzhe Qiao Baojiang Jiang Honggang Fu Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Safety Engineering Heilongjiang University of Science and TechnologyHarbin 150080China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Chinese Acad Sci Shanghai Synchrotron Radiat FacilShanghai Adv Res InstShanghai 201204China

The formation of chemical bonds between metal ions and their supports is an effective strategy to achieve good catalytic ***,both the synthesis of active metal species on a support and control of their coordination environment are still ***,we show the use of an organic compound to produce tubular carbon nitride(TCN)as a support for Pd nanoparticles(NPs),creating a composite material(NP-Pd-TCN).It was found that Pd ions preferentially bind with the electron-rich N atoms of TCN,leading to strong metal-support interactions that benefit charge transfer from g-C_(3)N_(4)to Pd.X-ray absorption spectroscopy further revealed that the metal-support interactions resulted in the formation of Pd-N bonds,which are responsible for the improvement in the charge dynamics as evidenced by the results from various techniques including photoluminescence(PL)spectroscopy,photocurrent measurements,and electrochemical impedance spectroscopy(EIS).Owing to the good dynamical properties,NP-Pd-TCN was used for photocatalytic hydrogen evolution under visible-light irradiation(λ>420 nm)and an excellent evolution rate of~381μmol·h^(-1)(0.02 g of the photocatalyst)was *** work aims to promote a strategy to synthesize efficient photocatalysts for hydrogen production by controllably introducing metal nanoparticles on a support and in the meantime forming chemical bonds to achieve intimate metal-support contact.

关键词： carbon nitride charge transfer dynamics photocatalysis hydrogen evolution reaction

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Significance of gypsum-salt rock series for marine hydrocarbon accumulation

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Petroleum Research 2017年第3期2卷 222-232页

作者： Wenhui liu Heng Zhao Quanyou liu Bing Zhou Dianwei Zhang Jie Wang Longfei Lu Houyong Luo Qingqiang meng Xiaoqi Wu State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development SINOPECBeijing 100083China Petroleum Exploration&Production Research Institute SINOPECBeijing 100083China Northwest University Shaanxi 710069China Lanzhou Center for Oil and Gas Resources Institute of Geology and GeophysicsChinese Academy of SciencesGansu 730000China University of Chinese Academy of Sciences Beijing 100049China

With further exploration and research,the gypsum-salts rock series as good caprocks attracted a lot of *** gypsum-salt rock series played an important role during migration,preservation and trapping of ***,major breakthroughs have been continuously made in marine petroleum exploration of gypsum-salt rock series in the eastern Ordos Basin,the central Tarim Basin and the western Sichuan Basin in China,and the high-evolution and low-abundance gypsum-salt rock series as hydrocarbon source rocks become *** research advances in the reservoirecaprock assemblage of gypsum-salt rock series,development and hydrocarbon-generation potential of source rocks in the gypsum-salt rock series were well studied in terms of source-rock development environment and hydrocarbon generation *** showed that the gypsum-salt rock series,including high-evolution and low-TOC gypsum-salt rock series in China,could be regarded as good source *** understanding was a breakthrough to previous traditional viewpoint that low-TOC gypsum-salt rock series could not act as effective hydrocarbon *** key to understand hydrocarbon-generation mechanism was that abundant and high-quality hydrocarbon-generation materials,large amount of hydrocarbon generation and conversion in geological history,and hydrocarbongeneration materials occurred in the form of carboxylates,were developed in the high-evolution and low-TOC gypsum-salt rock series.

关键词： Gypsum-salt rock series Hydrocarbon generation Source rock Sedimentary environment Reservoir Caprock

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Annual 30-m land use/land cover maps of China for 1980–2015 from the integration of AVHRR, MODIS and Landsat data using the BFAST algorithm

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Science China Earth Sciences 2020年第9期63卷 1390-1407页

作者： Yidi XU Le YU Dailiang PENG Jiyao ZHAO Yuqi CHENG Xiaoxuan liu Wei LI Ran meng Xinliang XU Peng GONG Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Ministry of Education Ecological Field Station for East Asian Migratory Birds Beijing 100084China Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijing 100094China College of Natural Resources and Environment Huazhong Agricultural UniversityWuhan 430070China State Key Laboratory of Resources and Environmental Information Systems Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Annual land use land cover(LULC)change information at medium spatial resolution(*** 30 m)is required in numerous subjects,such as biophysical modelling,land management and global change *** LULC information,however,is usually not available at continental or national scale due to reasons such as insufficient remote sensing data coverage or lack of computational *** we integrate high temporal resolution and coarse spatial resolution satellite images(i.e.,Moderate Resolution Imaging Spectroradiometer(MODIS)and Global Inventory Modelling and Mapping Studies(GIMMS)normalized difference vegetation index(NDVI))with high spatial resolution datasets(China’s Land-Use/cover Datasets(CLUDs)derived from 30-meter Landsat TM/ETM+/OLI)to generate reliable annual nominal 30 m LULC maps for the whole of China between 1980 and *** also test the performance of a statistical based change detection algorithm(Breaks for Additive Seasonal and Trend),originally designed for tracking forest change,in classifying all-type LULC *** a result,a nominal 30 m annual land use/land cover datasets(CLUD-A)from 1980 to 2015 was developed for the whole *** mapping results were assessed with a change sample dataset,a regional annual validation sample set and a three-year China sample *** the detected change years,75.61%matched the exact time of conversion within±1 *** mapping results provided a detail process of urbanization,deforestation,afforestation,water and cropland dynamics over the past 36 *** consistent characterization of land change dynamics for China can be further used in scientific research and to support land management for policy-makers.

关键词： Land use land cover(LULC) Breaks for Additive Seasonal and Trend(BFAST) Change detection Annual China

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High Fe^(LS)(C)electrochemical activity of an iron hexacyanoferrate cathode boosts superior sodium ion storage

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Carbon Energy 2023年第5期5卷 67-77页

作者： Junhong Guo Fan Feng Shiqiang Zhao Zhenhai Shi Rui Wang meng Yang Fangfang Chen Suli Chen Zi-Feng Ma Tianxi liu Key Laboratory of Synthetic and Biological Colloids Ministry of EducationInternational Joint Research Laboratory for Nano Energy CompositesSchool of Chemical and Material EngineeringJiangnan UniversityWuxiChina Department of Chemical Engineering Shanghai Electrochemical Energy Devices Research CenterShanghai Jiao Tong UniversityShanghaiChina College of Chemistry and Materials Engineering Wenzhou UniversityWenzhouChina

Sodium iron hexacyanoferrate(FeHCF)is one of the most promising cathode materials for sodium-ion batteries(SIBs)due to its low cost theoretical ***,the low electrochemical activity of Fe^(LS)(C)in FeHCF drags down its practical capacity and potential ***,FeHCF with high Fe^(LS)(C)electrochemical activity(C-FeHCF)is synthesized via a facile citric acid-assisted solvothermal *** the cathode of SIBs,C-FeHCF shows superior cycling stability(ca.87.3%capacity retention for 1000 cycles at 10 C)and outstanding rate performance(ca.68.5%capacity retention at 50 C).Importantly,the contribution of Fe^(LS)(C)to the whole capacity was quantitatively analyzed via combining dQ/dV and discharge curve for the first time,and the index reaches 44.53%for C-FeHCF,close to the theoretical ***-situ X-ray diffraction proves the structure stability of C-FeHCF during charge-discharge process,ensuring its superior cycling ***,the application feasibility of the C-FeHCF cathode in quasi-solid SIBs is also *** quasi-solid SIBs with the C-FeHCF cathode exhibit excellent electrochemical performance,delivering an initial discharge capacity of 106.5 mAh g^(−1) at 5 C and high capacity retention of 89.8%over 1200 *** work opens new insights into the design and development of advanced cathode materials for SIBs and the beyond.

关键词： cathode material electrochemical activity sodium-ion batteries sodium iron hexacyanoferrate structural evolution

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Regulation of aerobic glycolysis to decelerate tumor proliferation by small molecule inhibitors targeting glucose transporters

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Protein & Cell 2020年第6期11卷 446-451页

作者： meng Gao Jian Huang Xin Jiang Yafei yuan Huanhuan Pang Shuchen Luo Nan Wang Chengbo Yao Zuwan Lin Debing Pu Shuo Zhang Pengcheng Sun Zhuoyi liu Yu Xiao Qian Wang Zeping Hu Hang Yin Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China Tsinghua University-Peking University Joint Center for Life Sciences Tsinghua UniversityBeijing 100084China Beijing Advanced Innovation Center for Structural Biology Tsinghua UniversityBeijing 100084China State Key Laboratory of Membrane Biology School of Life SciencesTsinghua UniversityBeijing 100084China Department of Molecular Biology Princeton UniversityPrincetonNJ 08544USA School of Pharmaceutical Sciences Tsinghua UniversityBeijing 100084China Laboratory Medicine Center Zhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong 510515China

Dear Editor,Different from normal differentiated cells,metabolic reprogramming was spotted in cancer cells,due to increased demand for energy and macromolecule synthesis during their rapid proliferation(Hanahan and Weinberg,2011;Pavlova and Thompson,2016).Most cancer cells prefer anaerobic glycolysis even with oxygen in the environment due to its higher speed to produce macromolecular materials required for biosynthesis(Vander Heiden et al.,2009;DeBerardinis and Chandel,2016).But to compensate for the lower efficiency of anaerobic glycolysis in producing ATP,these cancer cells demand much higher glucose supply(Warburg,1956;Vander Heiden et al.,2009).These metabolic characteristics point to the huge demand of cancer cells for carbohydrate substrates,which creates the possibility of treating tumors by exploiting this feature(Patra et al.,2013;DeBerardinis and Chandel,2016).

关键词： al. glycolysis cancer

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Intermolecular hydrogen-bonding as a robust tool toward significantly improving the photothermal conversion efficiency of a NIR-II squaraine dye

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Chinese Chemical Letters 2024年第4期35卷 310-315页

作者： Songtao Cai liuying Wu yuan Li Soham Samanta Jinying Wang Bing liu Feihu Wu Kaitao Lai Yingchao liu Junle Qu Zhigang Yang Center for Biomedical Photonics&Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

The photothermal therapy(PTT) has come across as a promising noninvasive therapeutic strategy for tumor treatment. However, low photothermal conversion efficiency(PCE) and hydrophobicity may impede the therapeutic efficacy of organic photothermal agents and an efficient PTT-agent must overcome these two major challenges. In this work, we developed a new strategy to promote higher PCE wherein the intermolecular hydrogen-bonding interaction between the single dye molecule and water facilitated the transformation of the absorbed energy into the heat. A hydrophilic squaraine dye(SCy1) with the second near-infrared region(NIR-II) absorption and extremely low emission were designed to exhibit much higher PCE than that of the analogues of pentamethine-dyes(PCy1, PCy2). The presence of the ‘–O-' at middle of squaric cycle enabled the intermolecular H-bonding formation between the SCy1 and water to promote the energy dissipation channel. Moreover, the introduction of long-chain phenylsulfonate groups helped in to improve the water solubility apart from serving as an additional means of further enhancing PCE through fluorescence quenching. Therefore, SCy1 with a squaraine backbone and long-chain sulfonate moieties revealed outstanding photothermal stability and anti-aggregation activity apart from showing exceptionally high PCE(74%) in water. SCy1 demonstrated excellent therapeutic efficacy when applied in the PTT treatment of tumor-bearing mice under a laser irradiation of 915 nm.

关键词： Squaraine-based cyanine Hydrogen bonds High PCE Anti-aggregation Photothermal therapy

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Capacity analysis for cognitive heterogeneous networks with ideal/non-ideal sensing

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Frontiers of Information Technology & Electronic Engineering 2015年第1期16卷 1-11页

作者： Tao HUANG Ying-lei TENG meng-ting liu Jiang liu (State Key Laboratory of Networla'ng and Switching Technology Beifing University of Posts and Telecommunications Beij'ing 100876 China)

Due to irregular deployment of small base stations （SBSs）, the interference in cognitive heterogeneous networks （CHNs） becomes even more complex; in particular, the uncertainty of spectrum mobility aggravates the interference context. In this case, how to analyze system capacity to obtain a closed-form expression becomes a crucial problem. In this paper we employ stochastic methods to formulate the capacity of CHNs and achieve a closed-form expression. By using discrete-time Markov chains （DTMCs）, the spectrum mobility with respect to the arrival and departure of macro base station （MBS） users is modeled. Then an integral method is proposed to derive the interference based on stochastic geometry （SG）. Also, the effect of sensing accuracy on network capacity is discussed by concerning false-alarm and miss-detection events. Simulation results are illustrated to show that the proposed capacity analysis method for CHNs can approximate the conventional sum methods without rigorous requirement for channel station information （CSI）. Therefore, it turns out to be a feasible and efficient way to capture the network capacity in CHNs.

关键词： Cognitive heterogeneous networks Markov chain Stochastic geometry Homogeneous Poisson point process (HPPP)

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