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Revealing the vertical structure of in-situ fabricated perovskite nanocrystals films toward efficient pure red light-emitting diodes

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Fundamental Research 2024年第2期4卷 362-368页

作者： xian-gang Wu Shipei Sun Tinglu Song Xin Zhang Chenhui Wang Yingguo Yang Shuangpeng Wang Haizheng Zhong MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Experimental Center of Advanced Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Institute of Applied Physics and Materials Engineering University of MacaoMacao 999078China

The development of efficient perovskite light-emitting diodes(PeLEDs)relies strongly on the fabrication of perovskite films with rationally designed structures(grain size,composition,surface,etc.).Therefore,an understanding of structure-performance relationships is of vital importance for developing high-performance perovskite devices,particularly for devices with in-situ fabricated perovskite nanocrystal films.In this study,we reveal the vertical structure of an in-situ fabricated quasi-two-dimensional perovskite film.By combining time-of-flight secondary ion mass spectrometry,energy dispersive spectroscopy,grazing incidence wide-angle X-ray scattering(GIWAXS),and low-temperature photoluminescence spectra,we illustrate that the resulting in-situ fabricated DPPA_(2)Cs_(n-1)Pb_(n)(Br_(0.3)I_(0.7))_(3n+1)(DPPA^(+):3,3-diphenylpropylammonium)film has a gradient structure with a very thin layer of ligands on the surface,predominantly small-n domains at the top,and predominantly large-n domains at the bottom owing to the solubility difference of the precursors.In addition,GIWAXS measurements show that the domain of n=2 on the top layer has an ordered in-plane alignment.Based on the understanding of the film structure,we developed an in-situ fabrication process with ligand exchange to achieve efficient pure red PeLEDs at 638 nm with an average external quantum efficiency(EQE)of 7.4%.The optimized device had a maximum luminance of 623 cd/m^(2) with a peak EQE of 9.7%.

关键词： Light-emitting diodes Perovskite TOF-SIMS Vertical structure in-situ fabrication

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Enhanced piezo-response in copper halide perovskites based PVDF composite films

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Science Bulletin 2018年第19期63卷 1254-1259页

作者： Sheng Huang gang Tang Hailong Huang xian-gang Wu Puming Zhou Lin Zou Lei Xie Jianming Deng Xueyun Wang Haizheng Zhong Jiawang Hong Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081. China School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China The 48th Research Institute China Electronics Technology Group Corporation Changsha 410111 China Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621999 China

In-situ fabricated perovskite nanocrystals in polymeric matrix provide new generation composite materials for plenty of cutting edge technology. In this work, we report the in-situ fabrication of copper halide perovskite(MA_2CuCl_4, MA:CH_3NH_3^+) embedded poly(vinylidene fluoride)(PVDF) composite films. The optimized MA_2CuCl_4/PVDF composite films exhibit greatly enhanced piezo-response in comparasion with pure PVDF films. The enhancements were invesitgated and explained by applying piezo-response force microscopy(PFM) measurements and density functional theory(DFT) caculations. We proposed that the high piezoelectric properties of MA_2CuCl_4/PVDF composite films could be related to the large Cu off-centering displacement, the strong interactions between MA_2CuCl_4 and PVDF as well as large stress concentration around the MA_2CuCl_4 particles in the films. These piezoelectric composite films are expected to be suitable functional materials for flexible and/or wearable piezoelectrics.

关键词： PVDF 反应力卤化物电影合成铜 poly 压力集中

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In situ Injectable Tetra-PEG Hydrogel Bioadhesive for Sutureless Repair of Gastrointestinal Perforation

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Chinese Journal of Chemistry 2023年第23期41卷 3339-3348页

作者： Shurong Li Yiwen xian gang He Luyuan Chen Zhihui Chen Yonglong Hong Chong Zhang Decheng wu Guangdong Provincial Key Laboratory of Advanced Biomaterials Department of Biomedical EngineeringSouthern University of Science and TechnologyNo.1088 Xueyuan AvenueNanshan DistrictShenzhenGuangdong518055 China These authors contribute equally. Stomatology Center Shenzhen HospitalSouthern Medical UniversityNo.1333 New RoadBaoan DistrictShenzhenGuangdong518101 China

Hydrogel bioadhesives represent promising and efficient alternatives to sutures or staples for gastrointestinal(GI)perforation management.However,several concerns remain for the existing bioadhesives including slow and/or weak adhesive,poor mechanical strength,low biocompatibility,and poor biodegradability,which largely limit their clinical application in GI perforation repair.In this work,we introduce an in situ injectable Tetra-PEG hydrogel bioadhesive(SS)composed of tetra-armed poly(ethylene glycol)amine(Tetra-PEG-NH2)and tetra-armed poly(ethylene glycol)succinimidyl succinate(Tetra-PEG-SS)for the sutureless repair of GI defects.The SS hydrogel exhibits rapid gelation behavior and high burst pressure and is capable of providing instant robust adhesion and fluid-tight sealing in the ex vivo porcine intestinal and gastric models.Importantly,the succinyl ester linkers in the SS hydrogel endow the bioadhesive with suitable in vivo degradability to match the new GI tissue formation.The in vivo evaluation in the rat GI injured model further demonstrates the successful sutureless sealing and repair of the intestine and stomach by the SS hydrogel with the advantages of neglectable postsurgical adhesion,suppressed inflammation,and enhanced angiogenesis.Together,our results support potential clinical applications of the SS bioadhesive for the high-efficient repair of GI perforation.

关键词： Gastrointestinal perforation Bioadhesives Gels Biological activity Sutureless repair Regenerative wound healing

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CO_2-sensitive Amphiphilic Triblock Copolymer Self-assembly Morphology Transition and Accelerating Drug Release from Polymeric Vesicle

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Chinese Journal of Polymer Science 2018年第1期36卷 18-24页

作者： xian-wu Jing Zhi-Yu Huang Hong-Sheng Lu Bao-gang Wang College of Chemistry and Chemical Engineering Southwest Petroleum University Engineering Research Center of Oilfield Chemistry Ministry of Education

A series of triblock copolymers, containing a CO_2-switchable block poly（2-（dimethylamino）ethyl methacrylate）（PDM） block and two symmetrical hydrophilic blocks polyacrylamide（PAM）, were synthesized using atom transfer radical polymerization（ATRP） method. The p H and conductivity tests showed that the triblock copolymer exhibited switchable responsiveness to CO_2, i.e. a relatively low conductivity of solution could be switched on and off by bubbling and removing of CO_2, and the triblock copolymer aqueous solution displayed a CO_2-switchable viscosity variation. The changes were all attributed to protonation of tertiary amine groups in PDM blocks and proven by 1 H-NMR. Cryogenic transmission electron microscopy and dynamic light scattering characterization demonstrated that the viscosity variation was the result of a unilamellar vesicle-network aggregate structure transition. The release of rhodamine B from the vesicles with and without CO_2 stimuli showed the potential application in drug delivery domains; after CO_2 bubbling, the drug release rate could be accelerated. Finally, reasonable mechanism of CO_2-switchable morphology changes and CO_2-induced drug release was proposed.

关键词： ATRP CO_2-sensitive Polymeric vesicles Drug release

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High-rate performance and super long-cycle stability of Na_(3)V_(2)(PO_(4))_(3)cathode material coated by diatomic doped carbon

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Rare Metals 2023年第5期42卷 1570-1582页

作者： Jia Kang Ling Zhu Fei-Yang Teng Si-Qi Wang Yong-gang Huang Yan-Hong xiang Zhe Chen xian-Wen wu School of Physics and Electromechanical Engineering Jishou UniversityJishou416000China School of Chemistry and Chemical Engineering Jishou UniversityJishou416000China

Na_(3)V_(2)(PO_(4))_(3)is considered as one of the most promising cathodes for sodium ion batteries due to its excellent thermal stability,long cycle life and high energy density.However,the inferior intrinsic electronic conductivity which brings about the poor rate capability and cycling performance hinders its commercial application.Herein,the S-N co-doped carbon-coated Na_(3)V_(2)(PO_(4))_(3)(NVP@SNC)has been synthesized to resolve the problem.The prepared NVP@SNC forms a hierarchical structure assembled with nanosheets,which is in favor of the electrolyte infiltration and shortening the Na^(+)transmission distance.Numerous lattice defects can be induced in carbon layer by the co-doped elements(S-N),which reduce the Na^(+)diffusion energy barriers and provide adequate Na^(+)migration channels,thus jointly boosting the Na^(+)diffusion coefficient.Consequently,the NVP@SNC cathode shows a high reversible capacity with outstanding rate performance and super long-cycle stability.When discharged at 2.0C,it delivers the capacity near to the theoretical value with a capacity retention of 88.7%after 400cycles.Even if the current is as high as 50.0C,a high capacity of 58.6 mAh·g^(-1)has been released,and41.4 mAh·g^(-1)has been remained after the super long cycling of 4000 circles.This study is expected to supply a new thought of developing high-performance cathodes by diatomic doping for sodium ion battery.

关键词： Sodium ion battery(SIB) Cathode material Na_(3)V_(2)(PO_(4))_(3) Diatomic doping Carbon coating

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Reduction of NO_(x)emission based on optimized proportions of mill scale and coke breeze in sintering process

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1453-1461页

作者： Zhi-gang Que xian-bin Ai Sheng-li wu Institute of Energy Research Jiangxi Academy of ScienceNanchang 330096China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Reducing NO_(x) emission of iron ore sintering process in a cost effective manner is a challenge for the iron and steel industry at present.Effects of the proportion of mill scale and coke breeze on the NO_(x) emission,strength of sinter,and sinter indexes were studied by com-bustion and sinter pot tests.Results showed that the peak value of NO concentration,total of NO emission,and fuel-N conversion rate gradu-ally decreased as the proportions of the mill scale increased because NO was reduced to N_(2) by Fe_(3)O_(4),FeO,and Fe in the mill scale.The strength of sinter reached the highest value at 8.0wt%mill scale due to the formation of minerals with low melting point.The fuel-N conver-sion rate slightly fluctuated and total NO_(x) emission significantly decreased with the decreased proportions of coke breeze because CO forma-tion and content of N element in the sintered mixture decreased.However,the sinter strength also decreased due to the decrease in the amount of the melting minerals.Furthermore,results of the sinter pot tests indicated that NO_(x) emission decreased.The sinter indexes performed well when the proportions of mill scale and coke breeze were 8.0wt%and 3.70wt%respectively in the sintered mixture.

关键词： iron ore sinter NO_(x)emission mill scale coke breeze proportion optimization

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Stability and Determination of Metamizole Sodium by Capillary Electrophoresis Analysis Combined with Infra-red Spectroscopy

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Chemical Research in Chinese Universities 2007年第6期23卷 654-658页

作者： xianG Qian NIU gang wu xian-hua CHEN gang Department of Applied Chemistry Changchun Institute of Technology Changchun 130022 P. R. China Key Laboratory of Automobile Materials of Ministry of Education College of Materials Science and Engineering Jilin University Changchun 130012 P. R. China

Metamizole sodium was chosen as a representative of unstable analytes for investigation by discussing the effects of oxygen and solvent on its degradation reaction using the capillary electmphoresis technique. A possible degradation mechanism was deduced from the observed behavior and was confirmed by infra-red spectroscopic study. The degradation reaction could be inhibited obviously by methanol instead of water as the solvent of analyte. Under the optimized conditions： separation voltage of 20 kV, and 5 mmol/L disodium hydrogen phosphate and 5 mmol/L borax with 10% methanol（pH 9. 12） as the running buffer, the standard curve of metamizole sodium was linear in a range of 3.77- 74. 07 mg/L. A satisfactory result was achieved when the technique was used to detect metamizole sodium in tablet.

关键词： Capillary electmphoresis Metamizole sodium Stability

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Rapid prediction models for 3D geometry of landslide dam considering the damming process

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Journal of Mountain Science 2023年第4期20卷 928-942页

作者： wu Hao NIAN Ting-kai SHAN Zhi-gang LI Dong-yang GUO Xing-sen JIANG xian-gang Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu610041China Power China Huadong Engineering Corporation Limited Hangzhou310014China School of Civil Engineering Dalian University of TechnologyDalian116024China Department of Civil EnvironmentalGeomatic EngineeringUniversity College LondonLondonWC1E 6BTUK College of Civil Engineering Sichuan Agricultural UniversityChengdu610041China

The geometry of a landslide dam plays a critical role in its stability and failure mode,and is influenced by the damming process.However,there is a lack of understanding of the factors that affect the 3D geometry of a landslide dam.To address this gap,we conducted a study using the smoothed particle hydrodynamics numerical method to investigate the evolution of landslide dams.Our study included 17 numerical simulations to examine the effects of several factors on the geometry of landslide dams,including valley inclination,sliding angle,landslide velocity,and landslide mass repose angle.Based on this,three rapid prediction models were established for calculating the maximum height,the minimum height,and the maximum width of a landslide dam.The results show that the downstream width of a landslide dam remarkably increases with the valley inclination.The position of the maximum dam height along the valley direction is independent of external factors and is always located in the middle of the landslide width area.In contrast,that position of the maximum dam height across the valley direction is significantly influenced by the sliding angle and landslide velocity.To validate our models,we applied them to three typical landslide dams and found that the calculated values of the landslide dam geometry were in good agreement with the actual values.The findings of the current study provide a better understanding of the evolution and geometry of landslide dams,giving crucial guidance for the prediction and early warning of landslide dam disasters.

关键词： Landslide dam Runout distance SPH numerical simulations Rapid prediction models

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Phase I trial of human umbilical cord-derived mesenchymal stem cells for treatment of severe bronchopulmonary dysplasia

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Genes & Diseases 2023年第2期10卷 521-530页

作者： Yunqiu Xia Tingyuan Lang Yuqin Niu xian wu Ou Zhou Jihong Dai Lei Bao Ke Yang Lin Zou Zhou Fu gang Geng Department of Dermatology Ministry of Education Key Laboratory of Child Development and DisordersNational Clinical Research Center for Child Health and DisordersChina International Science and Technology Cooperation Base of Child Development and Critical DisordersChildren's Hospital of Chongqing Medical UniversityChongqing 400014China Department of Gynecologic Oncology School of MedicineChongqing University Cancer HospitalChongqing UniversityChongqing 400030China The First Affiliated Hospital School of MedicineShihezi UniversityShiheziXinjiang 832008China Department of Respiratory Medicine West China Second University HospitalSichuan UniversityChengduSichuan 610041China Department of Respiratory Medicine Children's Hospital of Chongqing Medical UniversityChongqing 400014China Department of Neonatology Children's Hospital of Chongqing Medical UniversityChongqing 400014China Chongqing Engineering Technology Research Center of Stem Cell Therapy Children's Hospital of Chongqing Medical UniversityChongqing 400014China Center for Clinical Molecular Medicine Children's Hospital of Chongqing Medical UniversityChongqing 400014China

Severe bronchopulmonary dysplasia(BPD)is a chronic lung disorder that primarily affects premature babies with extremely low birth weight and involves in multiple organ system;no effective pharmacotherapy for this disease exists,and mortality remains high.Based on the evidence from previous preclinical studies and phase I clinical trials,this study aims to test the safety of intravenous application of a single dose of human umbilical cord-derived mesenchymal stem cells(hUC-MSCs)in patients with severe BPD.The Mesenchymal Stem cells for Bronchopulmonary Dysplasia Treatment(MSBDT)trial is a single center,open-label,dose-escalation phase I clinical trial.Severe BPD patients were enrolled in Children Hospital of Chongqing Medical University,Chongqing,China.The first six patients were treated with low-dose hUC-MSCs(1×10^(6) cells/kg)and the next seven patients were treated with high-dose hUC-MSCs(5×10^(6) cells/kg).This study is registered with ClinicalTrials.gov,number NCT03558334.No prespecified infusion-associated adverse events,immediate complication,respiratory or cardiovascular compromise were observed during infusion and 24 h after infusion.No significant changes in safety laboratory values were observed.One death event occurred in the low-dose group on study day 10,and one death event occurred in the high-dose group on study day 24,while,after review in detail,the two cases are not believed to be infusion-associated events.In conclusion,intravenous application of a single dose of hUC-MSCs was tolerated in thirteen patients with severe BPD.

关键词： Bronchopulmonary dysplasia Dose escalation Human umbilical cord-derived mesenchymal stem cells Intravenous treatment Phase I trial

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Differences and identification on multi-time hydrocarbon generation of carboniferous-permian coaly source rocks in the Huanghua Depression, Bohai Bay Basin

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PETROLEUM SCIENCE 2024年第2期21卷 765-776页

作者： Xu, Jin-Jun Cheng, xian-gang Peng, Shu-Nan Jiang, Jun-Cai wu, Qi-Long Lou, Da Cheng, Fu-Qi Lin, La-Mei China Univ Petr East China Natl Key Lab Deep Oil & Gas Qingdao 266580 Shandong Peoples R China PetroChina Dagang Oilfield Co Tianjin 300280 Peoples R China

Coal is a solid combustible mineral, and coal-bearing strata have important hydrocarbon generation potential and contribute to more than 12% of the global hydrocarbon resources. However, the deposition and hydrocarbon evolution process of ancient coal-bearing strata is characterized by multiple geological times, leading to obvious distinctions in their hydrocarbon generation potential, geological processes, and production, which affect the evaluation and exploration of hydrocarbon resources derived from coaly source rocks worldwide. This study aimed to identify the differences on oil-generated parent macerals and the production of oil generated from different coaly source rocks and through different oil generation processes. Integrating with the analysis of previous tectonic burial history and hydrocarbon generation history, high-temperature and high-pressure thermal simulation experiments, organic geochemistry, and organic petrology were performed on the Carboniferous-Permian (C-P) coaly source rocks in the Huanghua Depression, Bohai Bay Basin. The oil-generated parent macerals of coal's secondary oil generation process (SOGP) were mainly hydrogen-rich collotelinite, collodetrinite, sporinite, and cutinite, while the oil-generated parent macerals of tertiary oil generation process (TOGP) were the remaining small amount of hydrogen-rich collotelinite, sporinite, and cutinite, as well as dispersed soluble organic matter and unexhausted residual hydrocarbons. Compared with coal, the oil-generated parent macerals of coaly shale SOGP were mostly sporinite and cutinite. And part of hydrogen-poor vitrinite, lacking hydrocarbon-rich macerals, and macerals of the TOGP, in addition to some remaining cutinite and a small amount of crude oil and bitumen from SOGP contributed to the oil yield. The results indicated that the changes in oil yield had a good junction between SOGP and TOGP, both coal and coaly shale had higher SOGP aborted oil yield than TOGP starting yield, and coaly shale TOGP peak oil yield was lower than SOG

关键词： Thermal simulation Multi -time oil generation processes Coaly source rock Carboniferous-permian Huanghua Depression AROMATIC-HYDROCARBONS THERMAL EVOLUTION BEARING STRATA SOLID BITUMEN OIL-FIELD MATURITY MARINE ORIGIN CHINA GAS

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