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Amino acid assisted aqueous synthesis of highly stable CsPbBr_(3)nanocrystals for cell imaging

nano Research 2025年第1期18卷 675-683页

作者： Xue Li Yanan Guo Guoying Tan Qingyi Liu nan song Yu Tang State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

Lead halide perovskite nanocrystals(NCs)exhibit excellent optoelectronic performance and have drawn great interests in the fields of biological imaging and ***,the poor stability of CsPbX_(3)(X=Cl,Br,I)in water is still a challenge to hinder their practical *** this work,a facile strategy has been developed for aqueous synthesis of CsPbX_(3) nanocrystals,in which L-glutamic acid(LGlu)has been used to replace oleic acid in the synthetic *** from the synergic effects of L-Glu and oleylamine(OAm),CsPbBr_(3)nanocrystals(L-Glu/OAm-CsPbBr_(3)NCs)with high water stability have been directly prepared under a mild condition at room temperature in water,facilitated by the process of crystal phase transformation from Cs_(4)PbBr_(6) to CsPbBr_(3).L-Glu/OAm-CsPbBr_(3)NCs exhibit a high quantum yield of 85%and a narrow full width at half maximum of 16 nm,demonstrating their efficient luminescence in ***,L-Glu on the surface have contributed greatly to an acidic environment and passivation of surface defects,improving the water stability and dispersibility of CsPbBr_(3)***,L-Glu/OAm-CsPbBr_(3)NCs exhibit great biocompatibility due to the presence of L-Glu,resulting in their good performance for HeLa cell ***,we propose a facile and effective method to prepare CsPbBr_(3)nanocrystals with excellent water stability by using L-Glu and OAm as cooperated ligands and expand their application in cell imaging.

关键词： aqueous synthesis cell imaging lead halide perovskite nanocrystals L-glutamic acid phase transformation

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从众还是认同:关于大学生旅游打卡行为与心理的调查研究

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长江师范学院学报 2025年第1期41卷 73-81页

作者：宋书楠敖思男辽宁师范大学历史文化旅游学院辽宁大连116000

随着旅游短视频的兴盛,旅游打卡逐渐成为一种时尚。作为当代青年的优秀群体,研究大学生的旅游打卡行为与心理具有现实意义。采用问卷调查的方式,对大学生的旅游打卡行为进行研究,并分析大学生在社交媒体发布旅游打卡信息的心理动因。研... 详细信息

随着旅游短视频的兴盛,旅游打卡逐渐成为一种时尚。作为当代青年的优秀群体,研究大学生的旅游打卡行为与心理具有现实意义。采用问卷调查的方式,对大学生的旅游打卡行为进行研究,并分析大学生在社交媒体发布旅游打卡信息的心理动因。研究得出结论:旅游短视频在一定程度上影响大学生的旅游决策,但该群体对短视频内容质量要求较高;大学生旅游打卡行为的心理动因更偏向于旅游地认同而不是盲目从众,呈现出理性态势。

关键词：短视频大学生旅游打卡心理动因

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Applications of pillarenes, an emerging class of synthetic macrocycles

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Science China Chemistry 2014年第9期57卷 1185-1198页

作者： song nan YANG Ying-Wei State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin University

Synthetic macrocycles, a typical type of building block for molecular recognition and self-assembly, are crucial to supramolecular chemistry and materials science. Since 2008, a new generation of synthetic macrocyclic hosts, pillarenes and their abundant derivatives, which consist of hydroquinone units linked by methylene bridges at 2,5-positions, have been the focus of much research. Numerous studies on their host-guest properties and the fabrication of supramolecular assemblies have demon- strated that pillarenes and their derivatives possess many advantages that facilitate their applications in many research fields. Herein we summarize and classitfy the applications of pillarenes in terms of artificial transmembrane channels, controlled delivery systems, dispersion of carbon hybrid materials, extraction and absorption, liquid crystals, metal-organic frameworks, sensing and detection, stabilization of nanoparticles （Au/Ag/CdTe）, and other typical biological applications. We also provide an overview of future developments in pillarene chemistry.

关键词： drug delivery host-guest interactions macrocycles pillarenes supramolecular materials

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Influence of the convective mixing-length parameterαon the chemical abundances in the case of metal-poor giant HD 122563

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Research in Astronomy and Astrophysics 2020年第8期20卷 181-192页

作者： nan song Sofya Alexeeval Gang Zhao Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBejjing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeiing 100049China

One-dimensional(1 D)model atmospheres are still the most commonly used tool for the determination of stellar chemical *** in the model is usually treated by mixing-length theory(MLT).The mixing-length parameterαis generally calibrated from the Sun and applied to all other *** metal-poor giant,HD 122563,is an important benchmark star to test stellar atmosphere and interior *** investigate the influence of the convection mixing-length parameterαon the determination of chemical abundances of Na,Mg,Al,Si,Ca,Sc,Ti,Cr,Mn,Co,Ni,Sr,Y,Zr and Ba in the case of HD 122563,taking advantage of a high resolution and high signal-to-noise ratio HARPS *** abundance discrepanciesΔ[X/H]that occur due toαvariation rarely exceed 0.05 dex and most are less than 0.03 *** calculate the discrepancyΔ[X/H]using a line-by-line differential *** abundance discrepancies do not have direct relation with either line strength or the excitation *** 1 D stellar atmospheric analysis of HD 122563,the accuracy of abundance determination does not strongly depend on the choice of mixing-length parameterα(causing average discrepancies of<0.03 dex),while the uncertainties in the effective temperature and surface gravity play a more important role.

关键词： stars:abundances convection stars:atmospheres line:profiles

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A stimuli-responsive pillar[5]arene-based hybrid material with enhanced tunable multicolor luminescence and ion-sensing ability

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National Science Review 2021年第6期8卷 60-69页

作者： Xin-Yue Lou nan song Ying-Wei Yang State Key Laboratory of Inorganic Synthesis and Preparative Chemistry International Joint Research Laboratory of Nano-Micro Architecture Chemistry (NMAC)College of ChemistryJilin University

Tunable luminescent materials are becoming more and more important owing to their broad application potential in various fields. Here we construct a pillar[5]arene-based hybrid material with stimuli-responsive luminescent properties and ion-sensing abilities from a pyridine-modified conjugated pillar[5]arene and a planar chromophore oligo(phenylenevinylene) upon coordination of Cd(II) metal cores. This new material not only shows an optimized luminescence due to the minimized π–π stacking and efficient charge transfer properties benefitting from the existence of pillar[5]arene rings, but also exhibits tunable multicolor emission induced by different external stimuli including solvent, ions and acid, indicating great application potential as a fluorescent sensory material, especially for Fe3+. With this pillar[5]arene-based dual-ligand hybrid material, valid optimization and regulation on the fluorescence of the original chromophore have been achieved, which demonstrates a plausible strategy for the design of tunable solid-state luminescent materials and also a prototypical model for the effective regulation of fluorescent properties of planarπ systems using synthetic macrocycle-based building blocks.

关键词： aggregation-induced emission supramolecular chemistry luminescent materials pillararenes macrocycles

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An Empirical Investigation on the Risk-Return Relationship of Carbon Future Market

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Journal of Systems Science & Complexity 2016年第4期29卷 1057-1070页

作者： LI Ziran QIAO Han song nan ZU Lei Collaborative Innovation Center for the Innovation and Regulation of Internet-Based Finance Southwestern University of Finance and EconomicsChengdu 611130China CFFEX Institute for Financial Derivatives Beijing 100033China School of Management University of Chinese Academy of SciencesBeijing 100190China Directors'Office Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Management Sciences and Engineering Central University of Finance and EconomicsBeijing 100081China

This paper examines the risk-return relationship for the carbon future market during Phases I, II and III of the European Union Emission Trading Scheme(EU ETS). The risk factors derived from the newly developed LSW model, are embedded into a GARCH framework. This new specification is compared with several GARCH-M type models analyzing the risk-return relationship in the carbon market. The results show that the new specification consistently achieves a good fit and possesses superior explanatory power for the European Union Allowance(EUA) data. Some policy suggestions regarding market efficiency are also provided.

关键词： Carbon price GARCH information diffusion risk-return.

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Multi-objective optimization of gas metal arc welding parameters and sequences for low-carbon steel (Q345D) T-joints

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Journal of Iron and Steel Research International 2017年第5期24卷 544-555页

作者： Qing Shao Tao Xu Tatsuo Yoshino nan song School of Mechanical Science and Engineering Jilin UniversityChangchun 130022JilinChina

Q345D high-quality low-carbon steel has been extensively employed in structures with stringent weld- ing quality requirements. A multi-objective optimization of welding stress and deformation was presented to design reasonable values of gas metal arc welding parameters and sequences of Q345D T-joints. The optimized factors included continuous variables （welding current （I）, welding voltage （U） ahd welding speed （V）） and discrete variables （welding sequence （S） and welding direc- tion （D））. The concepts of the pointer and stack in Visual Basic （VB） and the interpolation method were introduced to optimize the variables. The optimization objectives included the different combina- tions of the angular distortion and transverse welding stress along the transverse and longitudinal dis- tributions. Based on the design of experiments （DOE） and the polynomial regression （PR） model, the finite element （FE） results of the T-joint were used to establish the mathematical models. The Pareto front and the compromise solutions were obtained by using a multi-objective particle swarm optimization （MOPSO） algorithm. The optimal results were validated by the corresponding results of the FE method, and the error between the FE results and the two-objective results as well as that be-tween the FE results and the three-objective optimization results were less than 17.2% and 21.5%, respectively. The influence and setting regularity of different factors were discussed according to the compromise solutions.

关键词： T-joint Welding parameter Welding sequence Multi-objective optimization Pareto front Gas metal arc welding Q345D

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Prediction of forming limit curve(FLC) for Al–Li alloy 2198-T3 sheet using diferent yield functions

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Chinese Journal of Aeronautics 2013年第5期26卷 1317-1323页

作者： Li Xiaoqiang song nan Guo Guiqiang Sun Zhonggang School of Mechanical Engineering and Automation Beijing University of Aeronautics and Astronautics Aeronautical Manufacturing Technology Institute Shanghai Aircraft Manufacturing Co.Ltd.

The Forming Limit Curve （FLC） of the third generation aluminum-lithium （Al-Li） alloy 2198-T3 is measured by conducting a hemispherical dome test with specimens of different widths. The theoretical prediction of the FLC of 2198-T3 is based on the M-K theory utilizing respectively the von Mises, Hill＇48, Hosford and Barlat 89 yield functions, and the different predicted curves due to different yield functions are compared with the experimentally measured FLC of 2198-T3. The results show that though there are differences among the four predicted curves, yet they all agree well with the experimentally measured curve. In the area near the planar strain state, the predicted curves and experimentally measured curve are very close. The predicted curve based on the Hosford yield function is more accurate under the tension-compression strain states described in the left part of the FLC, while the accuracy is better for the predicted curve based on Hill＇48 yield function under the tension-tension strain states shown in the right part.

关键词： Aluminum-lithium alloy Fracture Forming limit curve M-K theory Theoretical prediction

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Rational design and synthesis of cerium dioxide-based nanocomposites

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nano Research 2023年第3期16卷 3622-3640页

作者： Haiyan An Liangliang Liu nan song Hongmei Zhu Yu Tang State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China School of Pharmacy Lanzhou UniversityLanzhou 730000China

Cerium dioxide(CeO_(2))-based nanocomposites,as a branch of nanocomposites,are always constructed from CeO_(2)combining with other constituents,which exhibit enhanced performance and excellent stability due to their inherent synergistic *** modulation of morphology,size,and types of doping of active metals can be achieved by designing the structures,which providing the opportunity to construct diverse CeO_(2)-based *** optimization of the structure enables the design of new multifunctional CeO_(2)-based nanocomposites for various applications such as the field of *** this minireview,we describe the recent development of the nanocomposites based on noble metal-,transition metal-,and metal-organic framework(MOF)-CeO_(2),which are synthesized through various scientific and rational ***,the design,synthesis,and basic working principles for CeO_(2)-based nanocomposites are also *** addition,some examples of their catalytic applications such as electrocatalysis,photocatalysis,and thermocatalysis are also ***,the structure-activity relationship in guiding the design and synthesis of CeO_(2)-based nanocomposites is summarized and prospected.

关键词： CeO_(2) nanocomposites synthetic strategy catalysis

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BODIPY@Ir(Ⅲ)Complexes Assembling Organic nanoparticles for Enhanced Photodynamic Therapy

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Chinese Journal of Polymer Science 2018年第3期36卷 417-424页

作者： Yang Liu nan song Li Chen Zhi-Gang Xie Department of Chemistry Northeast Normal UniversityChangchun 130024China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

We present a new cyclometalated Ir(III)complexes IrBDP,which could self-assemble into organic nanoparticles(IrBDP NPs).IrBDP NPs show enhanced photodynamic effect and can be engulfed by HeLa cells for cell imaging as ... 详细信息

关键词： BODIPY Photodynamic therapy Iridium complex

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