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Observation of room‐temperature out‐of‐plane switchable electric polarization in supported 3R‐MoS_(2) monolayers

SmartMat 2023年第2期4卷 154-162页

作者： Li Ma Liu Yang Yuqiang Fang Manzhang Xu Ruihuan Duan Vanessa Li Zhang Xuewen Wang Fuqiang Huang Menghao Wu Zheng Liu Ting Yu School of Physics and Technology Wuhan UniversityWuhanChina School of Physics and Wuhan National high Magnetic Field Center Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of high‐Performance Ceramics and Superfine Microstructure and CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi'anChina Centre for Programmed Materials School of Materials Science and EngineeringNanyang Technological UniversitySingaporeSingapore Wuhan institute of Quantum Technology WuhanChina

Two‐dimensional(2D)ferroelectrics have attracted considerable attention due to their potential in the development of devices of miniaturization and *** several van der Waals(vdW)‐layered materials show ferroelectricity,the experimental demonstrations of ferroelectric behavior in monolayers are very *** we report the observation of room‐temperature out‐of‐plane switchable electric polarization in supported MoS_(2) monolayers exfoliated from 3R‐stacked bulk crystals under ambient *** in situ piezoelectric force microscopy and Kelvin probe force microscopy in a glovebox,we reveal that trapped water/ice molecules are responsible for this switchable electric polarization and this conclusion is strongly supported by theoretical *** is worth noting that the water/ice trapping in the monolayers exfoliated from 2H‐stacked MoS_(2) crystals is not as much as that in 3R monolayers and,consequently,the out‐of‐plane electric polarization is missing *** findings indicate that monolayers with a trapped single layer of polar molecules might be emerging alternatives to 2D ***,the stacking sequences may bring new properties and applications to 2D vdW materials not only when we stack them up but also when we thin them down.

关键词： 3R‐MoS_(2)monolayers Kelvin probe force microscopy out‐of‐plane electric polarization piezoelectric force microscopy water/ice molecules

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Tobacco use among population sub-groups: A gender analysis

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Open Journal of Preventive Medicine 2012年第4期2卷 468-477页

作者： Ahmed Mandil Sahar Abdel Maqsoud Kholoud Tayel Mona Shama Epidemiology Department High Institute of Public Health [HIPH] Alexandria University Alexandria Egypt Family Health Department High Institute of Public Health University of Alexandria Alexandria Egypt Health Education Department High Institute of Public Health University of Alexandria Alexandria Egypt Preventive Affairs Department Alexandria University Students’ Clinic and Hospital Alexandria Egypt

Women comprise 20% of world’s billion smokers. Especially troubling is raising prevalence of tobacco use among girls. In fact, it is expected that 20% of women in developing/developed countries will be smokers by 2025. This study analytically compares knowledge, attitudes, and practices of tobacco use, by gender, among 4 sub-populations in Alexandria, Egypt. Methods: A cross sectional approach was used for 4 subgroups (high school students, university students, shopping malls/clubs’ attendees, employees of health-related facilities), 1000 each (total sample size = 4000). A modified version of WHO questionnaire was used for data collection. Results: Smoking prevalence was generally higher among males (29%-44%) compared to females (2% - 9%) in the studied groups. Cafeterias were preferable smoking places for both genders, especially among high school/university students. Most smokers in the 4 subgroups reported that most or all their friends were smokers. Mean knowledge scores were found to be higher among male employees/high school students, compared to females in the same sub-groups. Mean attitude scores towards smoking were higher among females (i.e. against smoking) in the 4 sub-samples. Conclusion & Recommendations: Tobacco use among males is generally higher among males, but females seem to be catching up. Social gatherings seem to attract many youngsters, of both genders, to smoke in public, especially waterpipe (which is a growing epidemic of tobacco use in our communities). Mass community- and gender-based health awareness campaigns are needed, using different channels, including school-based health education interventions, at the earliest age possible.

关键词： Tobacco Use Gender Analysis Population Sub-Groups

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Experimental demonstration of D-band signals wireless transmission over 30 km

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Science China Technological Sciences 2025年

作者： Yi WEI Xiongwei YANG Jianjun YU Xianming ZHAO Mingxu WANG Jingwen TAN Weiping LI Feng ZHAO Chengzhen BIAN Hansong MA Qinyi ZHANG Qiutong ZHANG Bing ZHANG Wen ZHOU Kaihui WANG Sicong XU Jianguo YU State Key Laboratory of ASIC and System Key Laboratory for Information Science of Electromagnetic Waves (MoE)and School of Information Science and Technology Fudan University Harbin institute of Technology School of Automation Xi'an University of Posts and Telecommunications School of Electronic Engineering Beijing University of Posts and Telecommunications

Due to the rise of innovative technologies like artificial intelligence(AI),the Internet of Things(IoT), and telemedicine, the demand for internet traffic is rapidly increasing. In order to achieve ultra-high-speed wireless communication, many researchers are directing their efforts towards the Dband. The D-band, spanning the frequency band 110–170 GHz, has abundant spectrum resources and license-free characteristics [1,2].

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RS and GIS-based Statistical Analysis of Secondary Geological Disasters after the 2008 Wenchuan Earthquake

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Acta Geologica Sinica(English Edition) 2009年第4期83卷 776-785页

作者： CHEN Jianping LI Jianfeng QIN Xuwen DONG Qingji SUN Yan The institute of high and New Techniques applied to Land Resources China University of Geosciences Beijing 100083 China The Beijing Key Laboratory of Development and Research for Land Resources Information Beijing 100083 China China Geological Survey Beijing 100037 China

Using RS and GIS means, this article analyzes the general geological characteristics and the structural belt distribution features in Wenchuan County, Sichuan province, P.R. China as well as the characteristics of the large-scale landslides, mud-rock flows, earthquake lakes, etc., after the earthquake on May 12, 2008. Based on the above work, comprehensive indoor and outdoor research is launched on disaster distribution characteristics and their relationship with earthquakes, terrains, strata, lithology, and structures. Weights of evidence method is utilized to quantitatively analyze and evaluate the spatial distribution of secondary geological disasters after the earthquake occurred. 3 remedying grades for secondary geological disasters are derived from the results of the weights of Evidence, followed by suggestions given to remedy earthquake secondary disasters.

关键词： secondary geological disaster disaster grade quantitative prediction and evaluation

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Robust CoAl Alloy： highly Active, Reusable and Green Catalyst in the Hydrogenolysis of Glycerol

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Chinese Journal of Chemistry 2011年第8期29卷 1563-1566页

作者：郭晓洋尹安远郭晓东郭秀英戴维林范康年 Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China State Key Laboratory of high Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

CoAl alloy catalyst is found, for the first time, to be highly active, selective and reusable for the synthesis of diols via the hydrogenolysis of glycerol under mild conditions. The products and the catalyst could be... 详细信息

关键词： CoAl biomass glycerol hydrogenolysis 1,2-propanediol

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Progress of nanoscience in China

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Frontiers of physics 2014年第3期9卷 257-288页

作者： Yu-Liang Zhao Yan-Lin Song Wei-Guo Song Wei Liang Xing-Yu Jiang Zhi-Yong Tang Hong-Xing Xu Zhi-Xiang Wei Yun-Qi Liu Ming-Hua Liu Lei Jiang Xin-He Bao Li-Jun Wan Chun-Li Bai National Center for Nanoscience and Nanotechnology Beijing 100190 China institute of Chemistry Chinese Academy of Sciences Beijing 100190 China institute of Physics Chinese Academy of Sciences Beijing 100190 China institute of high Energy Physics Chinese Academy of Sciences Beijing 100039 China institute of Biophysics Chinese Academy of Sciences Beijing 100190 China School of Chemistry and Environment Beijing University of Aeronautics and Astronautics Beijing 100191 China Shenyang Branch Chinese Academy of Seienees Shenyang 110004 China Chinese Academy of Sciences Beijing 100864 China

Fast evolving nanoseienees and nanotechnology in China has made it one of the front countries of nanotechnology development. Ill this review, we summarize some most recent progresses in nanoseienee research and nanotechnology development in China. The topics we selected in this article include llano-fabrication, nanocatalysis, bioinspired nanoteehnology, green printing nanotechnology, nanoplasmonics, nanomedicine, nanomaterials and their applications, energy and environmental nanoteehnology, nano EHS （nanosafety）, etc. Most of them have great potentials in applications or application-related key issues in future.

关键词： nanoscience nanotechnology nanomaterials nanomedicine plasmonics fal)rication catalysis nano EHS (nanosafety)

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Mesoporous carbon biomaterials

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Science China Materials 2015年第3期58卷 241-257页

作者：陈雨施剑林 State Key Laboratory of high Performance Ceramic and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of Sciences

Nano-biotechnology provides highly efficient and versatile strategies to improve the diagnostic precision and therapeutic efficiency of serious *** development of new biomaterial systems provides great opportunities for the successful clinical translation of nano-biotechnology for personalized biomedicine to benefit *** a new inorganic material system,mesoporous carbon biomaterials(MCBs) combine the merits of a mesoporous nanostructure and carbonaceous composition,showing superior qualities compared with traditional mesoporous silica and other carbon-based nanosystems,such as graphene,carbon nanotubes,and ***,this review focuses on the rational design,chemical synthesis,and biomedical applications of *** synthetic strategies for MCBs,especially mesoporous carbon nanoparticles(MCNs),are summarized,and several representative biomedical applications of MCBs are discussed in *** perform well for on-demand drug-release,photothermal therapy,synergistic therapy,fluorescent labeling of cancer cells,bio-adsorption of in vivo toxic pathogenic substances,peptide separation,and *** preliminary biosafety issue of MCBs is also briefly ***,the critical issues and challenges facing the future development of MCBs for clinical translation are *** is great promise for MCBs to reach clinical translations for biomedical applications based on their unique nanostructure,composition,and biocompatibility once some critical issues are fully addressed.

关键词： MSNs high DOX 生物材料介孔碳

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Novel twinned Al3Sc dendrites in as-casted Al-Sc alloy

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Rare Metals 2023年第3期42卷 838-843页

作者： Xing-Quan Wang Yu Wang Qian Jia Zhao-Chong Ding Jin-Jiang He Song-Xiao Hui State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.Ltd.Beijing 101407China GRIKIN Advanced Material Co. Ltd. Beijing Technology Research Center for Sputtering Target Material Engineering of high Pure Metals

Al-Sc alloys with high Sc contents are served as sputtering targets for making high-performance piezoelectric *** micro structure of these alloys would affect the sputtering process and the final quality of the functional *** this study,the microstructure in as-c as ted Al-20%Sc(in atomic ratio)alloys is characterized and the feathery Al3Sc grains with twin relationships are reported for the first *** crystallographic features of twined structures and growth directions are quantitatively analyzed by electron backscatter diffraction(EBSD)technique.

关键词： Al3Sc alloys twin

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Fabricating Pd isolated single atom sites on C3N4/rGO for heterogenization of homogeneous catalysis

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Nano Research 2020年第4期13卷 947-951页

作者： Ninghua Fu Xiao Liang Zhi Li Wenxing Chen Yu Wang Lirong Zheng Qinghua Zhang Chen Chen Dingsheng Wang Qing Peng Lin Gu Yadong Li Department of Chemistry Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science andEngineeringBeijing Institute of TechnologyBeijing 100081China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Metal isolated single atomic sites catalysts have attracted intensive attention in recent years owing to their maximized atom utilization and unique *** the success of single atom catalyst synthesis,directly anchoring metal single atoms on three-dimensional(3D)macro support,which is promising to achieve the heterogenization of homogeneous catalysis,remains a challenge and a blank in this ***,we successfully fabricate metal single atoms(Pd,Pt,Ru,Au)on porous carbon nitride/reduced graphene oxide(C3N4/rGO)foam as highly efficient catalysts with convenient recyclability.C3N4/rGO foam features two-dimensional microstructures with abundant N chelating sites for the stabilization of metal single atoms and vertically-aligned hierarchical mesostructure that benefits the mass *** obtained Pdi/C3N4/rGO monolith catalyst exhibits much enhanced activity over its nanoparticle counterpart for Suzuki-Miyaura ***,the Pdi/C3N4/rGO monolith catalyst can be readily assembled in a flow reactor to achieve the highly efficient continuous production of 4-nitro-1,1'-biphenyl through Suzuki-Miyaura coupling.

关键词： heterogenization of hom ogeneous catalysis metal isolated single atoms carbon nitride reduced graphene oxide monolith catalyst

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Nd^(3+)-sensitized upconversion nanoparticle coated with antimony shell for bioimaging and photothermal therapy in vitro using single laser irradiation

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Journal of Rare Earths 2022年第6期40卷 862-869,I0001页

作者： Solomon Tiruneh Dibaba Yao Xie Wensong Xi Artur Bednarkiewicz Wei Ren Lining Sun Research Center of Nano Science and Technology College of SciencesShanghai UniversityShanghai 200444China Physics Department International Centre for Quantum and Molecular StructuresShanghai UniversityShanghai 200444China Applied Physics Department School of Applied Natural ScienceAdama Science and Technology UniversityAdama 1888Ethiopia School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China institute of Low temperature and Structure Research Polish Academy of Sciences50-422 WroclawPoland

Combining treatment and diagnosis,called theranostics,which is achieved within single nanoparticle is an ultimate goal of many ***,we developed a new nanotheranostic agent-Nd^(3+)-sensitized upconversion nanoparticles core for dual modal imaging(i.e.,upconversion luminescence imaging and magnetic resonance imaging) and antimony nanoshell for photothermal therapy(PTT).The core-shellshell upconversion nanoparticles(NaYF_(4):Yb,Er@NaYF_(4):Yb,Nd@NaGdF_(4):Nd,named as UCNP) were firstly synthesized using thermal decomposition method and then were coated by antimony shell over the surface of UCNP using simple cost and time effective new ***,the surface of UCNP@Sb nanostructures was modified with DSPE-PEG in order to enhance the water solubility and *** final nanotheranostic agent,named as UCNP@Sb-PEG,exhibits very low toxicity,good biocompatibility,very good photothermal therapeutic effect,and efficient upconversion luminescence(UCL) imaging of HeLa cells under only one laser(808 nm) *** antimony shell is quenching the upconversion emission in pristine nanotheranostic agent,but interestingly,the UCL intensity of the agent recovers progressively under 808 nm laser irradiation due to light induced degradability of antimony ***,high longitudinal relaxivity(r_(1)) obtained from the experiment approves excellent potential of the nanotheranostic agent for T_(1)-weighted magnetic resonance imaging application.

关键词： Rare earths Upconversion luminescence Nanotheranostic agent Antimony shell Bioimaging Photothermal therapy

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