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Amino acid assisted aqueous synthesis of hig.l. 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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A Cheeger-Müller Theorem for Delocalized l^(2)-analytic Torsion Form

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Acta Mathematica Sinica,English Series 2024年第11期40卷 2615-2670页

作者： guo lin AN Chern Institute of Mathematics and lPMC Nankai UniversityTianjin300071P.R.China

In this paper we define the delocalized l^(2)-analytic torsion form and the delocalized l^(2)-combinatorial torsion *** using the method of Bismut-goette,under the conditions of positive Novikov-Shubin invariants,nontrivial finite conjugacy class and the existence of a family of fiberwise Morse functions whose gradient fields satisfy the Thom-Smale transversality condition in every fiber,we prove the Cheeger-Müller type relation between the delocalized l^(2)-analytic torsion form and the delocalized l^(2)-combinatorial torsion form.

关键词： Delocalized trace Novikov-Shubin invariant delocalized l^(2)-analytic torsion form delocalized l^(2)-combinatorial torsion form

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Theoretical Studies on the Intermonomer Interaction of F^(-)·(H_(2)O)_(n)(n=1,2)

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Chinese Journal of Structural Chemistry 2005年第5期24卷 561-567,491页

作者： WANg Yong-Cheng.l.ling.l.ng gENg Zhi-Yuan DAI guo-liang WANg Dong-Mei Department of Chemistry Northwest Normal UniversityLanzhou 730070China Department of Chemistry Tianshui Normal UniversityGansu 741009China

Five optimized geometries of F-?(H2O)n (n = 1, 2) were obtained with ab initio calculation at the B3lYP/6-311++g** level. The accurate intermonomer interaction energy was calculated using the MP2 electron correlation correction as well as the basis set superposition error correction by the Boys-Bernardi “counterpoise” protocol. Natural bond orbital (NBO) theory was applied to quantify the relative strength of these interactions and account for their effects on the stability, structural and vibrational parameters of Fˉ?(H2O)n (n = 1, 2). It is shown that the charge transferring from the lone pair of F-1 to the σ?OH(…F) antibonding orbital is important. The results indicate the occupancy of σ?OH(…F) is increased (denoted ?σ?OH(…F)) and the σOH(…F) bond is leng- thened (denoted ?ROH(…F)), leading to the red-shift and the red-shift values have linear correlation with both ?σ?OH(…F) and ?ROH(…F).

关键词： F^(-)·(H_(2)O)_(n)(n=1,2) interaction energy red-shift linear correlation

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SElECTIVE　OXYgENATION　OF　CYClOHEXENE　WITH　DIOXYgEN　USINg　POlYOXOMETAlATE　INTERCAlATED　lAYERED　DOUBlE　HYDROXIDES

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Chinese Chemical letters 1996年第6期7卷 531-534页

作者： guo, J Jiao, QZ Xiong, g.l., HJ Jiang, DZ Min, EZ JIlIN UNIV DEPT CHEM CHANGCHUN 130023 PEOPLES R CHINA RES INST PETR PROC BEIJING 100083 PEOPLES R CHINA

Cyclobexene was seleetively oxidized with dioxygeh by polyoxometalateintercalated layered double hydroxides to Produce 2-eyelobexene-one and2-ctclobexene-0 1undet mi id reaction *** talate p i I fared I ale red doub ie hydrox ideB (POa-lDHB) ate a newc lass of catalyt ic mater ial s deve loged in fecent yearB 11- 3]. *** it UBe as catalyBts bas not been we I I developed. Recent ly, M. A. Drezdzon teFor ted that the V,.0.:- and Mo.0::- an ions F if fared *** arefound to be effect ive catalyBts for convers ion of 2-Propanol and delydtogenat ion of butylethylbenzene [4]. Pinnavaia has noted that the BVW,,0.;SiV.W.0.;--, and 11.W,.0.g- an ionB intetcalated *** are b igh ly act ivecatalyBts for pbotocatal yi ic oxidat ion of isopropanol to acetone 15]. *** and co-workers have demonstrated that some POa intercalated bydroxi6es slow good catalyt ic act ivi t ies for the sbage Be feet ive eFoxidation of alienes with H:0. aB oxidant [6]. Recently, Xu laB found that somelDHs and tleit POa intercalates are hig.l. active catalysts fot tie alkylation of butene with isobutane 171. The studieB of these mater ials ihcatalyt ic oxidat ion, however, have rece tved I lit ie attent *** oxi6at ion of organic substrates wi th molecu far oxygen is very attract ive from the v iewgoint of induBtr ial technology and synthet ic organ icchemistry & nice molecular oxygen is cheap, env ironmental ly c lean and eaBy to handle IS]. I t bas been known that many trans it ion me tal compounds,l the metal loporpbyr ins 191, organome ta I I ic compounds 110] 1 and po lyoxome talates 111] t etc. j have been use6 fot sc feet ive oxidat ion of alkenes andalkanes with moleculat oxygen. However, tlete is no regott on the': TIts lroject,.s sugported by the *** ion of lydrocarbons kith diolygen us lug.l.HS and tie it POa intercalateB. In our pie, ionB,otk,,e la,e demonBttated tlat some lDH exb fo itgood catalyt ic act l, it tea for oxldat ion of eye lolexene wi t

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Effect of HSP70 antisense RNA on normal sorghum pollen formation

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Chinese Science Bulletin 1997年第23期42卷 1990-1994页

作者： Chen, JN Fu, HY lu, ZX Qin, HY Zhang, l guo, ZB Chinese Acad Sci Genet Inst Beijing 100101 Peoples R China

IT has been found that heat shock proteins (hsp) exist universally in animals, plants, microbesand human beings. Some of hsps possess functions of molecular chaperons, such as hsp60,hsp70 and hsp90, which participate in folding and assembling polypeptides to functional struc-tures and transferring them into suitable sites. They also undertake repairing damaged cellularDNA and nucleolus. Therefore, they are house-keeping proteins and play an importantrole in maintaining normal cellular life and functions and in cellular response to environmentalstresses. There exists high homology in DNA sequence among the hsp of the same molecularweight across species. We have first reported the close relationship between hsps

关键词： heat shock protein antisense RNA male sterility sorghum pollen.

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Influences of different degassing processes on refining effect and properties of 4004 Al alloy

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China Foundry 2013年第2期10卷 104-107页

作者： Wang.l.ping Cao guojian guo Erjun Wang guojun lü Xinyu School of Materials Science and Engineering Harbin University of Science and Technology China Northeast light Alloy Co. Ltd.

In order to improve the plasticity of 4004 AI alloy and subsequently the productivity of 4004 AI foil, the research studied in detail the influence of the rotary impeller degassing process on the refining effect of 4004 AI alloy, in which the impacts of four major parameters： gas flow, rotational speed, refining time, and stewing time, on degassing rate of 4004 AI alloy was systematically studied by using an orthogonal experiment methodology. Results show that the rotational speed has the greatest impact on the degassing of 4004 AI alloy, followed by gas flow and refining time; stewing time has the least impact. The optimum purification parameters obtained by current orthogonal analysis were： rotor speed of 500 ***1, inert gas flow of 0.4 ml.h-1, refining time of 15 min, and stewing time of 6 min. Degassing rate using the optimum parameters reaches 68%. In addition~ the comparison experiments among C2CI6 refining, rotary impeller degassing, and combined treatment of C2CI6 refining and rotary impeller degassing for 4004 AI alloy were performed. The experimental data indicated that the combined treatment of C2CI6 refining and rotary impeller degassing has the best degassing effect. Degassing rate of C2CI6 refining, rotary impeller degassing and combined refining treatment is 39%, 69.1% and 76.9%, respectively. The mechanical properties of the specimen refined by rotary impeller degassing were higher than those by C2CI6 refining, but lower than those by combined refining treatment.

关键词： aluminum alloys refinement technology rotary impeller degassing

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Analysis of carbon isotope in phytoliths from C3 and C4 plants and modern soils

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Chinese Science Bulletin 2000年第19期45卷 1804-1808页

作者： lÜ Houyuan WANg Yongji WANg guo'an YANg Hui lI Zhen First Institute of Oceanography State Oceanic AdministrationQingdao 266003China Institute of geology and geophysics Chinese Academy of SciencesBeijing 100029China lanzhou Institute of geology Chinese Academy of SciencesLanzhou 730000China

The analysis of carbon isotope in phytoliths from modern plants and surface soils in China shows that the values of carbon isotope are consistent with those from C3 and C4 plants, and the processes of photosynthesis of the original plants can be clearly identified by carbon isotope in phytoliths. The value of carbon isotope varied from -23.8‰ to -28‰, with the maximum distributed in the latitude zone from 34°N to 40°N in North China and East China areas, and the minimum in the Northeast China and South China regions. The values of carbon of phytoliths tend to increase from low to high and then reduce to low value again as the latitude increases. In the same latitude zone, the carbon isotope in phytoliths from grassland soil under the trees is obviously lower than that from grassland soil without any trees with the difference of 1‰ - 2‰.

关键词： C3 and C4 plants phytoliths carbon isotope.

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Electrode particulate materials for advanced rechargeable batteries:A review

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Particuology 2024年第3期86卷 160-181页

作者： Mingyang Ma Miao Du Yan liu Hongyan lü Jialin Yang Zelin Hao Jinzhi guo Xinglong Wu MOE Key laboratory for UV light-Emitting Materials and Technology Northeast Normal UniversityChangchunJilin130024China Department of Chemistry Northeast Normal UniversityChangchunJilin130024China

The demand for large-scale energy storage is increasing due to the decreasing non-renewable resources and deteriorating environmental *** rechargeable batteries with high energy density and long cycle performance is an ideal choice to meet the demand of energy storage *** development of excellent electrode particles is of great significance in the commercialization of nextgeneration *** ideal electrode particles should balance raw material reserves,electrochemical performance,price and environmental *** them,the development of electrode particulate materials with excellent electrochemical properties is the top priority at *** this review,the typical researches of electrode materials are summarized in terms of crystal structure,morphology,pore structure,surface and interface ***,the structural characteristics and improvement methods of transition metal oxides,polyanionic compounds,Prussian blue and their analogues are ***,the different effects of particulate morphology,pore,surface and interface structure on the performance of electrode materials are *** designing high-performance electrode materials,preparation route should be set according to the particle properties of the materials and the synergistic effect of various optimization methods should be *** the same time,in addition to the electrode materials,other components of the rechargeable batteries,such as current collector,separator and electrolytes,should be optimized to improve the overall performance of the *** review would provide important guiding principle for designing high-performance electrode particulate materials.

关键词： Particulate properties Electrode materials Rechargeable batteries

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The variety of thermal conduction resulting from segmented degree of heat source body and its bearing on temperature change

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Chinese Science Bulletin 1999年第15期44卷 1411-1415页

作者： guxian lü Hongcai Wang Tao guo Yinsheng Ma Daogong Hu Chinese Acad geol Sci Inst Geomech Beijing 100081 Peoples R China

The differences of thermal conduction and its temperature-varying track of the heat source body at various structural environments have been studied. Hypothetically, geologic heat source body is cut successively into several segregative bodies with a fixed cubage. With the segmented number increasing, the conductive surface area of heat source body begins to get larger, which separately is similar to the heat geologic body in different tectonic zones that has a various enclosed coefficient η（η=S0/sum from i=（1,n）（Si））. Finite-element simulation result shows that the thermal conduction speed of spreading from the heat source body to its wall rock is slow→higher→highest, when heat source bodies are situated respectively at compressive, shear and tensile deformation zones, corresponding rates of their temperature drop are low→higher→highest. Research indicates that the temperature’s dropping rate of heat source body has an inverse relationship with enclosed coefficient η for different structural

关键词： thermal conduction segmented degree finite-element tectono-physicochemistry.

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Progress in preparation of AlN-reinforced magnesium matrix composites:A review

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China Foundry 2024年第1期21卷 1-10页

作者： lu Chen Shu-lin lü Di-jia Zhao Wei guo Jian-yu li Shu-sen Wu State Key lab of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

As a ceramic material,AlN has very good thermophysical and mechanical *** addition,AlN is an effective refining agent for Mg alloys because it has a lattice constant similar to that of ***,AlN is an ideal reinforcement for magnesium matrix composites(MMCs),and is attracting increasing *** review addresses the development of preparation technologies for AlN-reinforced Mg matrix *** mainstream preparation techniques include stir casting,melt infiltration,powder metallurgy,and in-situ *** addition,the advantages and disadvantages of these techniques are analyzed in depth,and it is pointed out that the next direction for the preparation of high-performance AlN-reinforced MMCs is less aluminization and multiple technologies integration.

关键词： AlN MMCs preparation thermophysical property mechanical property

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