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In situ synthesis of graphitic-C3N4 nanosheet hybridized N-doped TiO2 nanofibers for efficient photocatalytic H2 production and degradation

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Nano Research 2015年第4期8卷 1199-1209页

作者： Cheng Han Yingde wang Yongpeng Lei Bing Wang Nan Wu Qi Shi Qiong Li Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense Technology Changsha 410073 China College of Materials Science and Engineering Wuhan Textile University Wuhan 430074 China College of Basic Education National University of Defense Technology Changsha 410073 China State Key Laboratory ofLow-Dimensiona/Quantum Physics and Department ofChemistry Tsinghua University Beijing 100084 China

Graphitic carbon nitride nanosheets （g-C3N4 NSs） hybridized nitrogen doped titanium dioxide （N-TiO2） nanofibers （GCN/NT NFs） have been synthesized in situ via a simple electrospinning process combined with a modified heat-etching method. The prepared GCN/NT NFs were characterized by a variety of methods and their photocatalytic activities were evaluated by hydrogen （H2） production from water splitting and degradation of rhodamine B in aqueous solution. It was found that the GCN/NT NFs have a mesoporous structure, composed of g-C3N4 NSs and N-doped TiO2 crystallites. The g-C3N4 NSs synthesized after heat-etching were found to be embedded in, and covered, the hybrid NFs to form stable interfaces. The partial decomposition of g-C3N4 releases its nitrogen content which eventually gets doped into the nearby TiO2 skeleton. The GCN/NT NFs give a high photocatalytic H2 production rate of 8,931.3 μmol·h^-1·g^-1 in aqueous methanol solution under simulated solar light. Such a highly efficient photocatalytic perfor- mance can be ascribed to the combined effects of g-C3N4 NSs and N-doped TiO2 with enhanced light absorption intensity and improved electron transport ability. Also, the large surface area of the mesoporous NFs minimizes light reflection on the surface and provides more surface-active sites. This work highlights the potential of quasi-one dimensional hybrid materials in the field of solar energy conversion.

关键词： photocatalyst graphitic carbon nitride titanium oxide nanofiber hydrogen production

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Optimized design of regeneration material for the treatment of peripheral nerve injury

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中国神经再生研究（英文版） 2015年第11期10卷 1780-1781页

作者： Hong-lian Dai Shi-pu Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei Province China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan Hubei Province China

Peripheral nerve defects are a common disabling *** nerve injuries arise from trauma,cancer,or congenital defects,and are challenging clinical issues to *** to statistical data from the World Health Organization,there are 10-15 million new trauma cases reported worldwide every year,of which 15-40％ involve peripheral nerve *** China,600,000-900,000 new cases of peripheral nerve injury are reported annually,approximately half of which require nerve ***,long-segment peripheral nerve defects and injury to multiple nerves cannot be repaired in the clinic,and neuromas form readily during the process of *** aim of treatment for peripheral nerve defects is the recovery not only of structure,but also sensory and motor ***,nerve regeneration and functional recovery after peripheral nerve damage remain important topics in the field of *** this review,we highlight a recent development in nerve regeneration surgery.

关键词： peripheral nerve injury nerve regeneration statistical data motor function the World

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Hollow [email protected] oxide core–shell composite for high-performance Li–S batteries

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Journal of Alloys and Compounds 2015年 650卷 604-609页

作者： Jiawei Zhang Ning Yang Xiaogang Yang Shengji Li Juming Yao Yurong Cai The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education National Engineering Lab for Textile Fiber Materials and Processing Technology Zhejiang College of Materials and Textiles Zhejiang Sci-Tech University Hangzhou 310018 China

In this paper, a hollow [email protected] oxide core–shell composite is synthesized for high-performance lithium-sulfur batteries through a facile two-step solution method with the assistance of polyvinylpyrrolidone. Scanning electron microscope observation shows that the hollow sulfur sphere is coated by the homogeneous graphene oxide nanolayer, and thermogravimetric analysis demonstrates the composite holds sulfur loading as high as 92 wt%. The composite served as cathode in lithium-sulfur batteries shows its capacity as high as 745 mAh g −1 at 0.2C after 20 cycles. It also has an excellent cycling stability even at a high current density of 1C (73% retention and 96% coulombic efficiency after 150 cycles), implying that the diffusion of the polysulfides into electrolyte can be greatly inhibited. It is believed that the structure design of graphene oxide coated hollow sulfur sphere can be developed for the practical application of high-performance lithium-sulfur batteries.

关键词： Core–shell structure Graphene oxide Sulfur loading High-performance Lithium-sulfur batteries

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2D Metals: 2D Metals by Repeated Size Reduction (Adv. Mater. 37/2016)

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advanced materials 2016年第37期28卷 8169-8169页

作者： Liu, Hanwen Tang, Hao Fang, Minghao Si, Wenjie Zhang, Qinghua Huang, Zhaohui Gu, Lin Pan, Wei Yao, Jie Nan, Cewen Wu, Hui State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China School of Materials Science and Technology China University of Geosciences Beijing100083 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Department of Materials Science and Engineering University of California BerkeleyCA94720 United States

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The 1.85 GPa AlSc Bulk Alloy with Abundant Nanoscale Growth Twins

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Chinese Physics Letters 2015年第7期32卷 114-117页

作者：卓龙超梁淑华张涛 School of Materials Science and Engineering Xi'an University of Technology Xi'an 710048 National Center for Electron Microscopy in Beijing School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Laboratory of Advanced Materials Tsingbua University Beijing 100084 Key Laboratory of Aerospace Materials and Performance (Ministry of Education) Department of Materials Science and Engineering Beihang University Beijing 100191

An in situ ultrahigh-strength ductile Al50Sc50 bulk alloy is produced by the copper mold casting method with a composite microstructure of micron-/submicron-sized grains and nanoscale twins. According to the microstruc- rural investigations, hierarchical nanotwinned lamellar AISc bundles with embedded micron-/submicron-sized AI2Sc and AISc2 are observed. The as-cast alloy displays a unique act of ultrahigh strength of -1.85 GPa to- gether with pronounced work hardening and a large plasticity of -14%. Further microstructural investigations on deformed specimens indicate that abundant hierarchical nanotwinned lamellar AISc bundles are effective to dissipate localization of shear stress or block dislocations from spreading throughout the alloy and hinder the propagation of mierocracks formed by local stress transition.

关键词： Al The 1.85 GPa AlSc Bulk Alloy with Abundant Nanoscale Growth Twins

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In-depth understanding of the chemical properties of rarely explored carbide cluster metallofullerenes: A case study of Sc2C2@C3v(8)-C82 that reveals a general rule

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Chemistry - A European Journal 2015年第8期21卷 3449-3454页

作者： Cai, Wenting Chen, Muqing Bao, Lipiao Xie, Yunpeng Akasaka, Takeshi Lu, Xing State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan430074 China Life Science Center of Tsukuba Advanced Research Alliance University of Tsukuba Foundation for Advancement of International Science Japan Tokyo Gakugei University Tsukuba Ibaraki305-8577 Japan

The chemical properties of carbide-cluster metallofullerenes (CCMFs) remain largely unexplored, although several new members of CCMFs have been discovered recently. Herein, we report the reaction between Sc2C2@ C3v(8)-C82, which is viewed as a prototypical CCMF because of its high abundance, and 3-triphenylmethyl-5-oxazolidinone (1) to afford the corresponding pyrrolidino derivative Sc 2C2@C3v(8)-C82(CH2)2NTrt (2;Trt = triphenylmethyl). Single-crystal X-ray crystallography studies of 2 revealed that the reaction takes place at a [6,6]-bond junction, which is directly over the encapsulated C2 unit and is far from either of the two scandium atoms. On the basis of theoretical calculations and by considering previously reports, we have found that a hexagonal carbon ring on the cage of Sc2C2@ C3vv(8)-C82 is highly reactive toward different reagents due to the overlap of high p-orbital axis vector (POAV) angles and large LUMO coefficients. We propose that this highly concentrated area of reactivity is generated by the encapsulation of the Sc2C2 cluster because this region is absent from the empty fullerene C3v(8)-C82. Moreover, the absorption and electrochemical results confirm that derivative 2 is more stable than pristine Sc2C2@ C3v(8)-C82, thus illuminating its potential applications. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA Weinheim.

关键词： Fullerenes

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Nanoparticles Prepared by Spray Pyrolysis

Nanoparticles Prepared by Spray Pyrolysis

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第九届海峡两岸超微颗粒学术研讨会暨中国颗粒学会超微颗粒专委会2015 年会

作者： Gang-Qin SHAO Jin-Hua LIU Zhen-Sheng GAO Jian LI Hui-Feng ZHANG State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The development of new synthetic methods or methodologies that provide controlled-over size, morphology and crystal structure have led advances in novel functional materials for specific purpose(e.g. magnetoelectric materials, energetic materials, sensors, catalyst). The spray pyrolysis technique has been generally accepted because the apparatus is simple, continuous, and easily scaled up to mass *** this work, the nanoparticles formation of oxides by spray pyrolysis is studied. The process involves thermal reactions of low-velocity aerosols(i.e., solid or liquid droplets suspended in air or argon) produced by a pneumatic nebulizer carried in a gas flow through a ceramic tube furnace up to 950 ℃. By nebulizing precursor solutions containing water soluble metal salts(e.g. hydroxides, acetate, nitrate, chloride) or metal coordination complexes(e.g. ammonium, oxo-), a myriad of mono- and multi-metallic oxide powders have been synthesized. With the addition of polymers or other composites forming materials, new and complex architectures can be easily added to the simple oxide *** diversity of applications and nanoparticles accessible have proven the spray pyrolysis technique to be a powerful tool. The relationship among the morphology, phase and function can be readily pursued by exploring new precursors and aerosol synthetic routes.

关键词： Nanoparticles Spray Pyrolysis Synthesis Aerosol

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One-dimensional inorganic nanomaterials for electrochemical energy storage devices

One-dimensional inorganic nanomaterials for electrochemical ...

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The 6th International Conference on Nanoscience & technology, China 2015

作者： Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

One-dimensional nanomaterials can offer large surface area, facile strain relaxation upon cycling and efficient electron transport pathway to achieve high electrochemical performance. Hence, nanowires have attracted increasing interest in energy related fields.[1-6] We designed the single nanowire electrochemical device for in situ probing the direct relationship between electrical transport, structure, and electrochemical properties of the single nanowire electrode to understand intrinsic reason of capacity fading. The results show that during the electrochemical reaction, conductivity of the nanowire electrode decreased, which limits the cycle life of the devices.[7] Then, the prelithiation and Langmuir-Blodgett technique have been used to improve cycling properties of nanowire electrode. Recently, we have fabricated hierarchical MnM o O4/Co Mo O4 heterostructured nanowires by combining "oriented attachment" and "self-assembly".[8] The asymmetric supercapacitors based on the hierarchical heterostructured nanowires show a high specific capacitance and good reversibility with a cycling efficiency of 98% after 1,000 cycles. Furthermore, we fabricated Li-air battery based on hierarchical mesoporous LSCO nanowires and nonaqueous electrolytes, which exhibits ultrahigh capacity over 11000 mA h g-1.[9] We also designed the hierarchical zigzag Na1.25V3O8 nanowires with topotactically encoded superior performance for sodium-ion battery cathodes.[10] Through our study, it will solve the challenge of property degradation and it may provide extend effect and helpful methods in directions, in energy storage and in open new applications.

关键词： Nanowire energy storage electrochemical performance devices

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Nano-optical imaging of WSe2 waveguide modes revealing light-exciton interactions

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Physical Review B 2016年第8期94卷 081402(R)-081402(R)页

作者： Z. Fei M. E. Scott D. J. Gosztola J. J. Foley, IV J. Yan D. G. Mandrus H. Wen P. Zhou D. W. Zhang Y. Sun J. R. Guest S. K. Gray W. Bao G. P. Wiederrecht X. Xu Center for Nanoscale Materials Argonne National Laboratory Lemont Illinois 60439 USA Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA Department of Physics University of Washington Seattle Washington 98195 USA Department of Chemistry William Paterson University Wayne New Jersey 07470 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Materials Science and Engineering University of Tennessee Knoxville Tennessee 37996 USA Advanced Photon Source Argonne National Laboratory Lemont Illinois 60439 USA State Key Laboratory of ASIC and System Department of Microelectronics Fudan University Shanghai 200433 China Department of Materials Science and Engineering University of Washington Seattle Washington 98195 USA

We report on a nano-optical imaging study of WSe2 thin flakes with scanning near-field optical microscopy (NSOM). The NSOM technique allows us to visualize in real space various waveguide photon modes inside WSe2. By tuning the excitation laser energy, we are able to map the entire dispersion of these waveguide modes both above and below the A exciton energy of WSe2. We found that all the modes interact strongly with WSe2 excitons. The outcome of the interaction is that the observed waveguide modes shift to higher momenta right below the A exciton energy. At higher energies, on the other hand, these modes are strongly damped due to adjacent B excitons or band-edge absorptions. The mode-shifting phenomena are consistent with polariton formation in WSe2.

关键词： Excitons Photonics Polaritons

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Global burden of 369 diseases and injuries in 204 countries and territories, 1990–2019: a systematic analysis for the Global Burden of Disease Study 2019

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The Lancet 2020年第10258期396卷 1204-1222页

作者： Abbafati, Cristiana Abbas, Kaja M. Abbasi, Mohammad Abbasifard, Mitra Abbasi-Kangevari, Mohsen Abbastabar, Hedayat Abd-Allah, Foad Abdelalim, Ahmed Abdollahi, Mohammad Abdollahpour, Ibrahim Abedi, Aidin Abedi, Parisa Abegaz, Kedir Hussein Abolhassani, Hassan Abosetugn, Akine Eshete Aboyans, Victor Abrams, Elissa M. Abreu, Lucas Guimarães Abrigo, Michael R.M. Abu Haimed, Abdulaziz Khalid Abualhasan, Ahmed Abu-Gharbieh, Eman Abu-Raddad, Laith Jamal Abushouk, Abdelrahman I. Acebedo, Alyssa Ackerman, Ilana N. Adabi, Maryam Adair, Tim Adamu, Abdu A. Adebayo, Oladimeji M. Adedeji, Isaac Akinkunmi Adekanmbi, Victor Adelson, Jaimie D. Adeoye, Abiodun Moshood Adetokunboh, Olatunji O. Adham, Davoud Advani, Shailesh M. Afarideh, Mohsen Afshari, Mahdi Afshin, Ashkan Agardh, Emilie E. Agarwal, Gina Agasthi, Pradyumna Agesa, Kareha M. Aghaali, Mohammad Aghamir, Seyed Mohammad Kazem Agrawal, Anurag Ahmad, Tauseef Ahmadi, Alireza Ahmadi, Keivan Ahmadi, Mehdi Ahmadieh, Hamid Ahmadpour, Ehsan Ahmed, Muktar Beshir Aji, Budi Akalu, Temesgen Yihunie Akinyemi, Rufus Olusola Akinyemiju, Tomi Akombi, Blessing Akunna, Chisom Joyqueenet Alahdab, Fares Al-Aly, Ziyad Alam, Khurshid Alam, Noore Alam, Samiah Alam, Tahiya Alanezi, Fahad Mashhour Alanzi, Turki M. Albertson, Samuel B. Alcalde-Rabanal, Jacqueline Elizabeth Alema, Niguse Meles Alemu, Biresaw Wassihun Alemu, Yihun Mulugeta Alhabib, Khalid F. Alhassan, Robert Kaba Ali, Muhammad Ali, Saqib Alicandro, Gianfranco Alijanzadeh, Mehran Alinia, Cyrus Alipour, Vahid Alizade, Hesam Aljunid, Syed Mohamed Alla, François Allebeck, Peter Almadi, Majid Abdulrahman Hamad Almasi, Ali Almasi-Hashiani, Amir Almasri, Nihad A. Al-Mekhlafi, Hesham M. Almulhim, Abdulaziz M. Alonso, Jordi Al-Raddadi, Rajaa M. Altirkawi, Khalid A. Alumran, Arwa Khalid Alvis-Guzman, Nelson Alvis-Zakzuk, Nelson J. Amare, Azmeraw T. Amare, Bekalu Amini, Saeed Amini-Rarani, Mostafa Aminorroaya, Arya Amiri, Fatemeh Amit, Arianna Maever L. Amugsi, Dickson A. Amul, Gianna Gayle Herrera Anbesu, Etsay Woldu Ancuceanu, Robert Anderl Department of Juridical and Economic Studies La Sapienza University Rome Italy Department of Infectious Disease Epidemiology London School of Hygiene and Tropical Medicine London United Kingdom Social Determinants of Health Research Center Tehran Iran Department of Neurology Cairo University Cairo Egypt School of Pharmacy Tehran Iran The Institute of Pharmaceutical Sciences (TIPS) Tehran Iran Neuroscience Research Center Isfahan University of Medical Sciences Isfahan Iran Biostatistics Department Near East University Nicosia Cyprus Biostatistics and Health Informatics Madda Walabu University Bale Robe Ethiopia Research Center for Immunodeficiencies Tehran Iran Karolinska University Hospital Huddinge Sweden Department of Cardiology Dupuytren University Hospital Limoges France University of Limoges Limoges France Department of Pediatric Dentistry Federal University of Minas Gerais Belo Horizonte Brazil Department of Research Philippine Institute for Development Studies Quezon City Philippines Department of Healthcare Policy and Research Weill Cornell Medical College in Qatar Doha Qatar Harvard Medical School Boston MA United States Department of Medicine Ain Shams University Cairo Egypt Hamadan University of Medical Sciences Hamadan Iran School of Medicine Cardiff University Cardiff United Kingdom School of Laboratory Medicine and Science University College Hospital Ibadan Ibadan Nigeria Institute of Cardiovascular Diseases University of Ibadan Ibadan Nigeria Centre of Excellence for Epidemiological Modelling and Analysis Stellenbosch University Cape Town South Africa Department of Global Health Stellenbosch University Cape Town South Africa School of Health Ardabil University of Medical Science Ardabil Iran Social Behavioral Research Branch National Institute of Health Bethesda MD United States Department of Oncology Georgetown University Washington DC DC United States Department of Health Metrics Sciences School of Medicine Seattle WA

Background: In an era of shifting global agendas and expanded emphasis on non-communicable diseases and injuries along with communicable diseases, sound evidence on trends by cause at the national level is essential. The Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) provides a systematic scientific assessment of published, publicly available, and contributed data on incidence, prevalence, and mortality for a mutually exclusive and collectively exhaustive list of diseases and injuries. Methods: GBD estimates incidence, prevalence, mortality, years of life lost (YLLs), years lived with disability (YLDs), and disability-adjusted life-years (DALYs) due to 369 diseases and injuries, for two sexes, and for 204 countries and territories. Input data were extracted from censuses, household surveys, civil registration and vital statistics, disease registries, health service use, air pollution monitors, satellite imaging, disease notifications, and other sources. Cause-specific death rates and cause fractions were calculated using the Cause of Death Ensemble model and spatiotemporal Gaussian process regression. Cause-specific deaths were adjusted to match the total all-cause deaths calculated as part of the GBD population, fertility, and mortality estimates. Deaths were multiplied by standard life expectancy at each age to calculate YLLs. A Bayesian meta-regression modelling tool, DisMod-MR 2.1, was used to ensure consistency between incidence, prevalence, remission, excess mortality, and cause-specific mortality for most causes. Prevalence estimates were multiplied by disability weights for mutually exclusive sequelae of diseases and injuries to calculate YLDs. We considered results in the context of the Socio-demographic Index (SDI), a composite indicator of income per capita, years of schooling, and fertility rate in females younger than 25 years. Uncertainty intervals (UIs) were generated for every metric using the 25th and 975th ordered 1000 draw value

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