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Revealing the crystallization process and realizing uniform 1.8 eV MA-based wide-bandgap mixed-halide perovskites via solution engineering

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Nano Research 2019年第5期12卷 1033-1039页

作者： Yue-Min Xie Chunqing Ma Xiuwen Xu Menglin Li Yuhui Ma Jing Wang Hrisheekesh Thachoth Chandran Chun-Sing lee Sai-Wing Tsang Department of Materials Science and Engineering City University of Hong KongHong Kong SARChina City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China Center of Super-Diamond and Advanced Films (COSDAF) City University of Hong KongHong Kong SARChina

Wide-bandgap perovskites are recently drawing tremendous attention in the community for high-efficiency all-perovskite tandem solar ***,the formamidinium (FA^+) and methylammonium (MA^+) based wide-bandgap mixed halide perovskites suffered from high density of traps and pin-holes,*** understanding on the crystallization and film formation processes are keys to overcome those challenges but not yet clearly *** this study,an in-situ photoluminescence technique was used to investigate the perovskite crystallization during the thermal annealing *** is found that the crystallization of a mixed halide perovskite with bromide (Br^-) and iodine (I^-) ions following the Ostward ripening crystal ***,it is found that the initial nucleation reaction is quickly completed in the first few seconds,however,leaving the small crystals with inhomogeneous *** different aggregation affinities of such inhomogeneous small crystals provoke the formation of pin-holes during the thermal annealing *** engineering the precursor solution to control the nucleation rate,the chemical composition of the small crystals has become *** pin-hole free high Br-composited wide-bandgap MA0.9Cs0.1Pb(I0.6Br0.4)3 perovskite films with bandgap energy of 1.8 eV have been *** corresponding photovoltaic devices have achieved an encouraging device efficiency of 15.1% with superb photostability.

关键词： in-situ photoluminance wide-bandgap perovskite pin-holes solution engineering

A novel nanoparticle drug delivery system:tumor-exosome encapsulated DOX for breast cancer treatment and cancer metastasis chemoprevention

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中国药理学与毒理学杂志 2019年第10期 895-896页

作者： ZHOU Yu XIE Xiao-dong NIE Hui-fang JIA lee Cancer Metastasis Alert and Prevention Center and Pharmaceutical Photocatalysis of State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFujian Provincial Key Laboratory of Cancer Metastasis Chemoprevention and Chemotherapy Fuzhou University Institute of Oceanography Minjiang University

OBJECTIVE To demonstrate the advantages of tumor exosomes as carriers for "natural nanoparticles" for drug delivery. METHODS The differences in various aspects of exosomes(such as particle size,potential, surface protein, etc.) before and after drug loading(DOX) were compared. Flow cytometry analysis and distribution of exosomes in mice verified the specificity of tumor exosomes for distal tissues, and additionally analyzed the natural targeting of tumor exosomes by confocal experiments and flow cytometry. Tumor exosomes surface protein knockout experiments demonstrate that exosomes indicate that proteins can increase drug delivery efficiency. Animal experiments verify that tumor exosomes loaded with drugs(DOX) inhibit tumor growth and tumor metastasis. RESULTS There were no significant differences in various aspects of exosomes(such as particle size, potential, surface protein, etc.) before and after drug loading(DOX). Confocal and flow analysis showed that the tumor exosomes had good targeting. CD47 knockout experiments demonstrate that tumor exosomes act as drug carriers to reduce the body′ s immune response and enhance drug targeting and delivery efficiency. CONCLUSION Tumor exosomes have great potential and advantages as a targeted drug carrier in the treatment of tumors and prevention of tumor metastasis.

关键词： exosome tumor metastasis drug deliver

Intrinsic electrochemical activity of Ni in Ni_(3)Sn_(4) anode accommodating high capacity and mechanical stability for fast-charging lithium-ion batteries

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Journal of Energy Chemistry 2022年第8期31卷 470-477,I0013页

作者： Janghyuk Moon Trung Dinh Hoang Seong Soo Park Seowan Park Dong Young Rhee Junwon lee Sang A Han Min-Sik Park Jung Ho Kim School of Energy Systems Engineering Chung-Ang UniversityHeukseok-RoDongjak-guSeoul 06974Republic of Korea Department of Advanced Materials Engineering for Information and Electronics Integrated Education Institute for Frontier Science&Technology(BK21 Four)Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin 17104Republic of Korea Institute for Superconducting&Electronic Materials(ISEM) Australian Institute of Innovative Materials(AIIM)University of WollongongInnovation CampusSquires WayNorth WollongongNSW 2500Australia

Fast interfacial kinetics derived from bicontinuous three-dimensional(3D)architecture is a strategic feature for achieving fast-charging lithium-ion batteries(LIBs).One of the main reasons is its large active surface and short diffusion ***,understanding of unusual electrochemical properties still remain great challenge due to its *** this study,we proposed a nickel–tin compound(Ni_(3)Sn_(4))supported by 3D Nickel scaffolds as main frame because the Ni_(3)Sn_(4) clearly offers a higher reversible capacity and stable cycling performance than bare tin(Sn).In order to verify the role of Ni,atomic-scale simulation based on density functional theory systematically addressed to the reaction mechanism and structural evolution of Ni_(3)Sn_(4) during the lithiation *** findings are that Ni enables Ni_(3)Sn_(4) to possess higher mechanical stability in terms of reactive flow stress,subsequently lead to improve Li storage *** study elucidates an understanding of the lithiation mechanism of Ni_(3)Sn_(4) and provides a new perspective for the design of high-capacity and high-power 3D anodes for fast-charging LIBs.

关键词： Lithium-ion batteries Ni_(3)Sn_(4) High-capacity anode 3D-structured electrode Inverse opal structure Density functional theory

Self-powered and flexible piezo-sensors based on conductivitycontrolled GaN nanowire-arrays for mimicking rapid-and slow-adapting mechanoreceptors

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npj Flexible Electronics 2022年第1期6卷 642-652页

作者： Aadil Waseem Ameer Abdullah Indrajit V.Bagal Jun-Seok Ha June Key lee Sang-Wan Ryu Department of Physics Chonnam National UniversityGwangju 61186Republic of Korea Optoelectronics Convergence Research Center Chonnam National UniversityGwangju 61186Republic of Korea

Human skin contains slowly adaptive(SA)and rapidly adaptive(RA)mechanoreceptors,which respond differently to external *** on human tactile perception principles,the fabrication of a self-powered electronic skin(e-skin)that simultaneously mimics SA-and RA-mechanoreceptors is a prime need for robots and artificial prosthetics to interact with the surrounding ***,the complex process of merging multimode sensors to mimic SA-and RA-mechanoreceptors hinders their utilization in *** proposed SA-and RA-mechanoreceptors based on n-type and semi-insulating GaN nanowire *** SA-and RA-mechanoreceptors demonstrated distinguished features such as grasping of objects and detection of their surface *** on piezoelectric sensing principles,the proposed e-skin can simultaneously mimic static and dynamic pressure *** further detected several stimuli of various pressures with low and high *** response and reset times showed by SA-mechanoreceptors were 11 and 18 ms under 1-Hz frequency,which are rapid enough for practical e-skin applications.

关键词： arrays rapid conductivity

Levels and correlates of 24-hour movement behaviors among South Koreans:Results from the Korea National Health and Nutrition Examination Surveys,2014 and 2015

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Journal of Sport and Health Science 2019年第4期8卷 376-385页

作者： Eun-Young,lee Valerie Carson Justin Y.Jeon John C.Spence Mark S.Tremblay School of Kinesiology and Health Studies Queen's UniversityKingston ON K7L 2N9Canada Faculty of Kinesiology Sportand RecreationUniversity of AlbertaEdmonton AB T6G 2H9Canada Department of Sport Industry Faculty of Education SciencesYonsei UniversitySeoul 03722Republic of Korea Healthy Active Living and Obesity(HALO)Research Group CHEO Research InstituteOttawa ON KIH 8L1Canada

*** study aimed to examine the levels and correlates of 24-h movement behaviors(i.e.,physical activity,sedentary time,and sleep),and different patterns of these behaviors in a nationally representative sample of South Koreans aged 12 years and *** study also aimed to examine the sociodemographic correlates of 24?h movement behaviors stratified by age ***-reported,repeated cross-sectional data from 10,708 participants in the 2014 and 2015 Korea National Health and Nutrition Examination surveys were *** variables included moderate-to-vigorous intensity physical activity,muscular strengthening exercises,walking,active transportation,sedentary time,and *** variables included age,sex,household income,area of residence,and education *** statistics by sex and age as well as general linear models by age group were *** proportions of individuals meeting the moderate-to-vigorous intensity physical activity,muscular strengthening exercises,and sleep guidelines were,respectively,21.6%,22.1%,and 32.5%in male youth;6.9%,4.5%,and 22.8%in female youth;55.5%,30.8%,and 54.0%in male adults;48.8%,14.4%,and 57.6%in female adults;44.0%,30.6%,and 45.5%in male older adults;and 29.5%,8.9%,and 37.3%in female older *** proportions of individuals showing the most ideal combinations of 24-h movement behaviors were only 3.2%in youth,0.4%in adults,and 0 in older ***,older age,female sex,or living in metro Seoul were associated with unfavorable patterns of 24-h movement behaviors across different age ***,the associations of income and education with movement behaviors were mixed across age ***,the proportion of South Koreans with a healthy 24-h movement behavior pattern is *** sociodemographic correlates of different types of 24-h movement behaviors should be considered when designing targeted interventions for the promotion of healthy active living for

关键词： 24-h movement behavior Behavioral epidemiology Guideline adherence Health behavior surveillance

Removal performance,mechanisms,and influencing factors of biochar for air pollutants:a critical review

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Biochar 2022年第1期4卷 678-701页

作者： Zhipeng Zhao Bing Wang Benny K.G.Theng Xinqing lee Xueyang Zhang Miao Chen Peng Xu College of Resource and Environmental Engineering Guizhou UniversityGuiyang 550025China Key Laboratory of Karst Georesources and Environment Ministry of EducationGuiyang 550025China Manaaki Whenua-Landcare Research Palmerston NorthNew Zealand State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse School of Environmental EngineeringXuzhou University of TechnologyXuzhou 221018China

The emission of air pollutants from various industries is a major contributor to environmental *** removal of these pollutants before they are discharged into the environment has become an important means of controlling air *** has attracted increasing attention because of its low cost,high porosity,large specific surface area,abundant surface functional groups,and high removal *** physicochemical properties of biochar are greatly affected by feedstock types,preparation,and modification *** this reason,the capacity and propensity of biochar for removing air pollutants are rather *** understand the existing research status and grasp the latest research progress,a systematic review on the removal of different air pollutants by biochar is highly *** on the recent research,this paper systematically analyzes and summarizes the preparation and modification methods of biochar commonly used for the removal of six air pollutants(SO_(2),H_(2)S,CO_(2),Hg0,VOCs,and NH_(3)),as well as the removal performance and ***,the potential influencing factors(preparation parameters,physicochemical characteristics of biochar,and removal conditions)are ***,the regeneration of biochar,suggestions,and future perspectives are proposed.

关键词： Biochar Modification Air pollutants Removal performance Removal mechanisms Influencing factors

Formation mechanism of twin domain boundary in 2D materials: The case for WTe2

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Nano Research 2019年第3期12卷 569-573页

作者： Guan-Yong Wang Weiyu Xie Dan Xu Hai-Yang Ma Hao Yang Hong Lu Hao-Hua Sun Yao-yi Li Shuang Jia Liang Fu Shengbai Zhang Jin-Feng Jia Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York 12180 USA Institute of Chemical Materials China Academy of Engineering Physics (CAEP) P. O. Box 919-327 Mianyang 621900 China International Center for Quantum Materials School of Physics Peking University Beijing 100084 China Department of Physics Massachusetts Institute of Technology Cambridge MA 02139 USA Tsung-Dao lee Institute Shanghai 200240 China

Our scanning tunneling microscopy (STM) study observes, for the first time, twin domain boundary (TDB) formations on the surface of WTe2 single crystal, which is glued by solidifying indium to Si substrate. In these TDB regions, a large inhomogeneous strain field, especially a critical shear strain of about 7%, is observed by geometric phase analysis. This observation does not obey the old believe that a small mechanical stress is sufficient to drive thermally-induced TDB formations in two-dimensional materials. To resolve the contradiction, we perform density functional theory calculations combined with elasticity theory analysis, which show that TDBs on WTe2 are entirely displacement-induced, for which a critical strain is necessary to overcome the onset barrier.

关键词： twin domain boundary seanning tunneling microscopy (STM) density functional theory strain WTe2

Pravastatin activates PPARα/PPARγexpression in the liver and gallbladder epithelium of hamsters

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Hepatobiliary & Pancreatic Diseases International 2011年第2期10卷 185-190页

作者： Seok Ho Dong Jin lee Dong Hee Koh Min Ho Choi Hyun Joo Jang Sea Hyub Kae Division of Gastroenterology Department of Internal MedicineKyung Hee University College of Medicine Division of Gastroenterology Department of Internal MedicineHallym University College of Medicine

BACKGROUND:Our earlier study with cultured gallbladder epithelial cells demonstrated that statins(HMG-CoA reductase inhibitors)activate the expression of PPARαand PPARγ, consequently blocking the production of pro-inflmmatory *** present study used hamsters to investigate the effects of pavastatin on PPARα/PPARγexpression in the liver and gallbladder epithelium,and to determine whether pravastatin suppresses cholesterol crystal formation in the gallbladder. METHODS:A total of 40 Golden Syrian male hamsters(4 weeks old)were randomly assigned to four groups(basal diet control; basal diet+pavastatin;high cholesterol diet;high cholesterol diet+pravastatin).All hamsters were 11 weeks old at the end of the *** liver,gallbladder and bile were harvested. Immunohistochemical staining and Western blotting for PPARαand PPARγwere performed in the liver and gallbladder. A drop of fresh bile was examined for cholesterol crystals under a microscope. RESULTS:In the gallbladder and liver of the hamsters, pravastatin activated the PPARαand PPARγexpression of gallbladder epithelial cells and hepatocytes,and particularly the response of PPARγwas much stronger than that of PPARα. Pravastatin suppressed the formation of cholesterol gallstones or crystals in the gallbladder. CONCLUSION:Pravastatin is an effective medication to activate PPARs(especially PPARγ)in the liver and the gallbladder epithelium of hamsters,and contributes to the prevention of gallstone formation.

关键词： pravastatin PPARα PPARγ hamster gallstone

利用面波波形模拟探测中国大陆地壳和上地幔波速结构的分区特征

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地震学报 2008年第2期30卷 114-122页

作者：冯梅安美建 Suzan van der lee 中国地质科学院地质力学研究所中国北京100081 Department of Earth and Planetary Sciences Northwestern University Evanston IL 60208-2150 USA

对穿过中国大陆东部、中部、北部和西部4个不同地区的8条地震射线路径的波形进行拟合分析,反演得到了各路径下方的一维平均波速结构.反演得到的地壳和上地幔波速结构表现出明显的分区特征,该特征与已知的大地构造单元和已有的研究成果... 详细信息

对穿过中国大陆东部、中部、北部和西部4个不同地区的8条地震射线路径的波形进行拟合分析,反演得到了各路径下方的一维平均波速结构.反演得到的地壳和上地幔波速结构表现出明显的分区特征,该特征与已知的大地构造单元和已有的研究成果吻合较好.表明面波波形拟合方法是一种可靠的探测地壳和上地幔波速结构的方法,且比单纯利用基阶面波频散对上地幔结构探测更具优势.

关键词：面波波形模拟分区特征地壳和上地幔波速中国大陆

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