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Two-step phase manipulation by tailoring Chemical bonds results in high-performance GeSe thermoelectrics

The Innovation 2023年第6期4卷 59-68页

作者： Wenqing Yao Yihua Zhang Tu Lyu Weibo Huang Nuoxian Huang Xiang Li Chaohua Zhang Fusheng Liu Matthias Wuttig Yuan Yu Min Hong Lipeng Hu College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China Institute of Physics(A) RWTH Aachen UniversitySommerfeldstraBe 1452074 AachenGermany PGI 10(Green IT) Forschungszentrum Jjilich GmbH52428 JdlichGermany Center for Future Materials and School of Engineering University of Southem QueenslandSpringfield CentralQLD 4300Australia

In thermoelectrics,phase engineering serves a crucial function in deter-mining the power factor by affecting the band degeneracy.However,for low-symmetry compounds,the mainstream one-step phase manipulation strategy,depending solely on the valley or orbital degeneracy,is inadequate to attain a high density-of-states effective mass and exceptional zT.Here,we employ a distinctive two-step phase manipulation strategy through stepwise tailoring Chemical bonds in GeSe.Initially,we amplify the valley degeneracy via CdTe alloying,which elevates the crystal symmetry from a covalently bonded orthorhombic to a metavalently bonded rhombohedral phase by significantly suppressing the Peierls distortion.Subsequently,we incorporate Pb to trigger the convergence of multivalence bands and further enhance the density-of-states effective mass by moderately restraining the Peierls distortion.Additionally,the atypical metavalent bonding in rhombohedral GeSe enables a high Ge vacancy concentration and a small band effective mass,leading to increased carrier concentration and mobility.This weak Chemical bond along with strong lattice anharmonicity also reduces lattice thermal conductivity.Consequently,this unique property ensemble contributes to an outstanding zT of 0.9 at 773 K for Geo.8oPbo.2oSe(CdTe)o.25.This work underscores the pivotal role of the two-step phase manipulation by stepwise tailoring of Chemical bonds in improving the thermoelectric performance of p-bonded chalcogenides.

关键词： alloying phase Chemical

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Euphorstranoids A and B,two highly rearranged ingenane diterpenoids from Euphorbia stracheyi:structural elucidation,Chemical transformation,and lipid-lowering activity

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Organic Chemistry Frontiers 2022年第3期9卷 775-780页

作者： Fang-Yu Yuan Yue-Hua Pan Ai-Ping Yin Wei Li Dong Huang Xue-Long Yan Shu-Qi Wu Gui-Hua Tang Rong Pu Sheng Yin School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhouGuangdong 510006People’s Republic of China Department of Clinical Laboratory the Third People’s Hospital of DongguanDongguan 523326People’s Republic of China

Euphorstranoids A(1)and B(2),two highly rearranged ingenane diterpenoids with an unusual 5/6/7/3 carbon ring system,were isolated from Euphorbia stracheyi.Their structures were determined by a combination of spectral,Chemical,and X-ray diffraction methods.The plausible biosynthetic pathway of 1 and 2 was proposed and Chemically mimicked.Compounds 1 and 2 significantly inhibited the triglyceride(TG)level in 3T3-L1 adipocytes via retarding cell adipogenesis at the early stage.

关键词： methods Chemical elucidation

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A case of Chemical eye injuries and aspiration pneumonia caused by occupational acute Chemical poisoning

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World Journal of Emergency Medicine 2023年第1期14卷 83-84页

作者： Li-wen Zhao Long-ke Shi Ya-qian Li Zi-xin Wen Ping Han Xiang-dong Jian School of Public Health Cheeloo College of MedicineShandong UniversityJinan 250012China Department of Poisoning and Occupational Diseases Emergency MedicineQilu HospitalCheeloo College of MedicineShandong UniversityJinan 250012China School of Nursing and Rehabilitation Cheeloo College of MedicineShandong UniversityJinan 250012China Department of Emergency Medicine Qilu HospitalCheeloo College of MedicineShandong UniversityJinan 250012China

Dear editor,According to the China’s National Standard Diagnostic Criteria of Occupational Diseases,occupational acute Chemical poisoning refers to the short-term exposure of workers to several Chemicals during production,resulting in corresponding organ damage.Herein,we report a case of Chemical eye injuries and aspiration pneumonia caused by acute Chemical poisoning in the Chemical industry.

关键词： injuries Chemical editor

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Analysis on influencing factors of detecting Chemical oxygen demand in water by three-dimensional spectroscopy

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Optoelectronics Letters 2024年第1期20卷 42-47页

作者： ZHOU Kunpeng LIU Zhiyang CONG Menglong MAN Shanxin Inner Mongolia Autonomous Region Joint Laboratory of Nuclear and Radiation Detection College of Physics and Electronic InformationInner Mongolia Minzu UniversityTongliao 028000China College of Information Engineering Jingzhou UniversityJingzhou 434000China Alxa League Meteorological Bureau Alxa 750300China

This paper focuses on the standard Chemical oxygen demand(COD)liquid and studies the impact of pH,nitrite nitrogen,nitrate nitrogen,heavy metals,salinity,and other factors on fluorescence intensity and fluorescence peak positions during the detection of COD in water using fluorescence spectrometry.The influence mechanisms of different environmental factors on fluorescence spectra are also analyzed.Results indicate that pH value affects the fluorescence emission wavelength(Em),resulting in a red shift from 1.5 to 7.2,and a blue shift from 7.2 to 12.3.Nitrate nitrogen can react with organic matter in water to form nitro compounds,leading to a decrease in fluorescence intensity.Salinity has a negligible effect on T1 peak but a relatively large effect on T2 peak.Heavy metal ion concentration has a significant impact on T2 peak,while T1 peak position shifts with an increase in heavy metal ions.This study aims to explore the factors that can impact the detection of COD in water using three-dimensional fluorescence spectrometry,providing references to improve accuracy and practicability for COD detection based on three-dimensional fluorescence spectrometry.

关键词： Chemical negligible nitrate

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Key nanomaterials for industrial Chemical process

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Nano Research 2023年第5期16卷 6013-6014页

作者： Xiang Feng Han Hu De Chen State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580China Department of Chemical Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway

Growing concerns about the increasing global energy consumption and CO_(2)emission have greatly accelerated the development of new nanotechnologies in industrial Chemical processes.However,this poses huge scientific and technological challenges,and normally requires novel materials and also novel synthesis strategies for traditional nanomaterials.This topical collection includes some of the latest studies on nanoscience and nanotechnology in Chemical processes,such as separation,energy storage,and catalytic reactions(e.g.,hydrogenation,dehydrogenation,hydrogen evolution,selective oxidation,C–C coupling,and C–O bond formation).It includes 4 topics:(i)nanoscience and nanotechnology towards industrial process;(ii)nanomaterials for novel green Chemical processes;(iii)novel nanomaterials for traditional processes;and(iv)novel synthesis strategy for nanomaterials.

关键词： materials Chemical process

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Analysis on influencing factors of detecting Chemical oxygen demand in water by ultraviolet absorption spectroscopy

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Optoelectronics Letters 2022年第12期18卷 749-754页

作者： ZHOU Kunpeng LIU Zhiyang CONG Menglong MAN Shanxin Intelligent Manufacturing Technology Key Laboratory Intelligent Agricultural Machinery Equipment&Technology TeamCollege of EngineeringInner Mongolia Minzu UniversityTongliao028000China College of Information Engineering Jingzhou University(College of Engineering and Technology Yangtze University)Jingzhou434000China Alxa League Meteorological Bureau Alxa750300China

Taking the standard solution and actual water samples as the research object, this paper studies the influence of various environmental factors(temperature, alkalinity(pH), inorganic salt ions and salinity) on the detection of Chemical oxygen demand(COD) in water by ultra-violet(UV) spectrometry, analyzes the influence mechanism, and draws relevant conclusions. The results show that the UV absorbance of the COD standard solution and the actual river water samples varies very little with temperature. The value of pH has certain impact on both the standard solution and the actual water samples, but the pH values of the affected experimental samples are in different ranges. The effects of nitrogen salt ions(NO_(2)^(-)and NO_(3)^(-)) on the UV absorption spectra can be eliminated by intercepting the UV spectrum interval less affected for modeling. The influence of salinity values below 35‰ on the UV absorption spectrum of water is mainly concentrated in the spectral band of 200—250 nm, and the influence above 250 nm is very little. This paper provides a preliminary analysis and discussion on the influence mechanism and laws of various environmental factors in the detection of water quality parameters by UV spectrometry, which provides an experimental basis for selecting the optimal test conditions when establishing the COD prediction model.

关键词： absorption Chemical mechanism

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Multiscale process systems engineering—analysis and design of Chemical and energy systems from molecular design up to process optimization

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Frontiers of Chemical Science and Engineering 2022年第2期16卷 137-140页

作者： Teng Zhou Kai Sundmacher Process Systems Engineering Max Planck Institute for Dynamics of Complex Technical SystemsD-39106 MagdeburgGermany Process Systems Engineering Otto-von-Guericke University MagdeburgD-39106 MagdeburgGermany

As indicated by Grossmann and Westerberg[1],a process system can be generally decomposed into hierarchical levels or scales at which different physical and/or Chemical phenomena take place(see Fig.1).The first step of multiscale process modeling is to connect the molecular level with the phase level,where the main task is to model and predict the properties of fluid mixtures based on the atomic-or molecular-level information.Typically,quantum Chemical(QC)computation,molecular simulation,and equations of state are used to provide such predictions.Recently,due to the ever-increasing number of available data and fast development of cheminformatics and machine learning tools,data-driven descriptor models have been developed and widely used for property predictions[2].

关键词： process Chemical optimization

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Special issue on “Green Chemical process and intensification”

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Frontiers of Chemical Science and Engineering 2022年第11期16卷 1533-1535页

作者： You Han Xiang Ma Lin-Bing Sun Jianhong Xu School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Material(SICAM)College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

In order to better unite and lead young Chemical engineering scholars,the Chemical Industry and Engineering Society of China will establish Youth Working Committee.At the time of the establishment of Youth Working Committee,we were invited as guest editors to organize the special issue of Frontiers of Chemical Science and Engineering on green Chemical process and intensification,aiming to inspire the innovative ideas and build an energetic and academic communication platform for young scholars.

关键词： intensification process Chemical

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Infrared Chemical imaging through non-degenerate two-photon absorption in silicon-based cameras

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Light(Science & Applications) 2020年第1期9卷 813-822页

作者： David Knez Adam M.Hanninen Richard C.Prince Eric O.Potma Dmitry A.Fishman Department of Chemistry University of CaliforniaIrvineCA 92697USA Department of Biomedical Engineering University of CaliforniaIrvineCA 92697USA

Chemical imaging based on mid-infrared(MIR)spectroscopic contrast is an important technique with a myriad of applications,including biomedical imaging and environmental monitoring.Current MIR cameras,however,lack performance and are much less affordable than mature Si-based devices,which operate in the visible and nearinfrared regions.Here,we demonstrate fast MIR Chemical imaging through non-degenerate two-photon absorption(NTA)in a standard Si-based charge-coupled device(CCD).We show that wide-field MIR images can be obtained at 100 ms exposure times using picosecond pulse energies of only a few femtojoules per pixel through NTA directly on the CCD chip.Because this on-chip approach does not rely on phase matching,it is alignment-free and does not necessitate complex postprocessing of the images.We emphasize the utility of this technique through Chemically selective MIR imaging of polymers and biological samples,including MIR videos of moving targets,physical processes and live nematodes.

关键词： absorption Infrared Chemical

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Neuroprotection mediated by natural products and their Chemical derivatives

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Neural Regeneration Research 2020年第11期15卷 2008-2015页

作者： Fei Fei Ning Su Xia Li Zhou Fei Department of Ophthalmology Xijing Hospitalthe Fourth Military Medical UniversityXi’anShaanxi ProvinceChina Department of Radiation Oncology Xijing Hospitalthe Fourth Military Medical UniversityXi’anShaanxi ProvinceChina Department of Neurosurgery Xijing Hospitalthe Fourth Military Medical UniversityXi’anShaanxi ProvinceChina

Neuronal injuries can lead to various diseases such as neurodegenerative diseases,stroke,trauma,ischemia and,more specifically,glaucoma and optic neuritis.The cellular mechanisms that regulate neuronal death include calcium influx and calcium overload,excitatory amino acid release,oxidative stress,inflammation and microglial activation.Much attention has been paid to the effective prevention and treatment of neuroprotective drugs by natural products.This review summarizes the neuroprotective aspects of natural products,extracted from Panax ginseng,Camellia sinensis,soy and some other plants,and some of their Chemical derivatives.Their antioxidative and anti-inflammatory action and their inhibition of apoptosis and microglial activation are assessed.This will provide new directions for the development of novel drugs and strategies to treat neurodegenerative diseases.

关键词： antioxidant effect brain injuries Camellia sinensis Chemical derivatives curcumin genistein natural products neurodegenerative diseases neuroprotection Panax

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