检索结果-南通市图书馆

High-performance solid-state lithium metal batteries achieved by interface modification

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第4期79卷 357-364页

作者： lei zhai Kai Yang Fuyi Jiang Wenbao Liu Zhenhua Yan Jianchao Sun School of Environment and Material Engineering Yantai UniversityYantai 264005ShandongChina College of Chemistry and Material Science Shandong Agriculture UniversityTaian 271018ShandongChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

Garnet-structured ceramic electrolyte Li_(6.75)La_(3)Zr_(1.75)Ta_(0.25)O_(12)(LLZTO)attracts significant consideration in solid-state Li metal batteries due to its wide electrochemical window and favorable compatibility with Li ***,the deployment of LLZTO is severely hampered by poor contact between LLZTO and Li metal *** this paper,an ultra-thin Al-Si interface buffer layer(10 nm)is constructed on LLZTO by a magnetron sputtering method,which allows superior wetting of Li onto the LLZTO surface due to the alloying reaction between the Al-Si layer and Li *** resulting Li/Al-Si coated LLZTO(ASL)/Li symmetrical cell delivers an interfacial resistance of 15.0Ωcm^(-2),which is much lower than that of 1140.3Ωcm^(-2)for the bare LLZTO symmetrical ***,the Li/ASL/Li symmetrical cells exhibit stable plating/striping performance(800 h)with small voltage hysteresis at 1.0 mA cm^(-2).Besides,the full cell with LiFePO_(4)cathode reveals a high capacity of 124.1 mA h g^(-1)after 600 cycles at 0.5C with a lowcapacity decay of 0.032%per *** believe this work will facilitate the development of solid-state rechargeable batteries.

关键词： Garnet electrolyte Solid-state batteries Lithium metal anode Interfacial resistance Aluminum-silicon layer

Preparation of an amphoteric flocculant having both high polymer content and low viscosity and its polymerization kinetics

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第1期27卷 130-135页

作者： Shenwen Fang Manlin Wang Zipei Xu lei zhai Xiujun Wang Yan Xiong School of Chemistry and Chemical Engineering Southwest Petroleum University Oil&Gas Applied Chemistry Key Laboratory of Sichuan Province Beijing Research Center of China National Offshore Oil Corporation

It is not easy for liquid cationic flocculant diallyldimethyl-ammonium chloride(DM) homopolymer to simultaneously exhibit both low viscosity and high polymer content, which limited its application in offshore *** this paper, sodium allylsulfonate(XS) and sodium formate were used in the aqueous solution polymerization of *** amphoteric flocculant(PDMXS) with the properties of high polymer content(about 55 wt%) and low viscosity(efflux time measured by an Apply 4 viscometer was less than 100 s) was *** optimum reaction conditions were identified as follows: the mass ratio of XS/DM was 10 wt%, the concentration of sodium formate was 2000 mg·L^(-1), reaction temperature was 55 ℃, the concentration of KPS was 0.5 wt% and the reaction time was 4 *** polymerization kinetics was *** results showed that R_p∝ [M]^(1.97)[I]^(0.68)[CTA]^(0.71) and the apparent activation energy was 72.55 kJ·mol^(-1).

关键词： diallyldimethyl-ammonium chloride(DM) PDMXS

Thermal Expansion Behavior of Poly(amide-imide)Films with Ultrahigh Tensile Strength and Ultralow CTE

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第7期38卷 748-758,I0007页

作者： Lan Bai lei zhai Min-Hui He Chang-Ou Wang Song Mo Lin Fan Laboratory of Advanced Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

A series of novel poly(amide-imide)(PAl)films with different amide contents were prepared from pyromellitic dianhydride and four amide-containing *** PAl films exhibited excellent mechanical and thermal properties with tensile strength of 203.7-297.4 MPa and Tg above 407℃.The rigid backbone structures combined with strong intermolecular interactions provided PAl films with ultralow in-plane CTE values from-4.17 ppm/℃to-0.39 ppm/℃in the temperature range of 30-300℃.The correlation between thermal expansion behavior and aggregation structures of PAl film was *** results suggested that hydrogen bonding interactions could be maintained even at high temperature,thus resulting in good dimension reversibility of films in multiple heating-cooling *** is demonstrated that dimensional stabilities of PAl films are determined by the rigidity,orientation,and packing of molecular ***-resistant PAl films with ultralow CTE can be developed as flexible substrates by regulating backbones and aggregation structures for optoelectronic application.

关键词： Poly(amide-imide)s Thermal expansion behavior Aggregation structures

Mesoscopic Simulation Assistant Design of Immiscible Polyimide/BN Blend Films with Enhanced Thermal Conductivity

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2018年第12期36卷 1394-1402页

作者： Guo-Dong Zhang Lin Fan Lan Bai Min-Hui He lei zhai Song Mo Laboratory of Advanced Polymer Materials Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 China

The mesoscopic simulation technique was applied to describe the phase separation behavior ofpolyimide blends and used for design of immiscible polyimide/BN blend films with enhanced thermal conductivity. The simulation equilibrium morphologies of different poly（amic acid）（PAA） blend systems were investigated and compared with optical images of corresponding polyimide blend films obtained by experiment. The immiscible polyimide blend fihns containing nano-/micro-sized BN with vertical double percolation structure were prepared. The result indicated that the thermal conductivity of polyimide blend film with 25 wt% nano-sized BN reached 1,16 W/（m·K）, which was 236% increment compared with that of the homogenous film containing the same BN ratio. The significant enhancement in thermal conductivity was attributed to the good phase separation of polyimide matrix, which made the inorganic fillers selectively localized in one continuous phase with high packing density, consequently, forming the effective thermal conductive pathway.

关键词： Polyimide films Boron nitride Mesoscopic simulation Thermal conductivity

Thermally Conductive Polyimide/Boron Nitride Composite Films with Improved Interfacial Compatibility Based on Modified Fillers by Polyimide Brushes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第12期41卷 1921-1936,I0009页

作者： Meng-Yan Gao lei zhai Song Mo Yan Jia Yi Liu Min-Hui He Lin Fan Key Laboratory of Science and Technology on High-tech Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Polyimide-based composite films with high thermal conductivity,good mechanical property and electrical insulating performance are urgently needed in the electronics and microelectronics *** one of the key technical challenges to be solved,interfacial compatibility between filler and matrix plays an important role for composite ***,boron nitride was modified by grafting polyimide brushes via a twostep method,and a series of thermally conductive polyimide/boron nitride composite films were *** characterization and performance results proved that the interfacial interaction and compatibility was greatly enhanced,resulting in a significant reduction in defects and interfacial thermal *** interphase width of transition zone between two phases was also efficiently enlarged due to polyimide brushes grafted on filler *** a result,composite films based on polyimide-grafted boron nitride exhibited significantly improved properties compared with those based on pristine *** strength can reach up to 80 MPa even if the filler content is as high as 50 wt%.The out-of-plane and in-plane thermal conductivity of composite film increased to 0.841 and 0.850 W·m^(-1)·K^(-1),*** addition,thermal and dielectric properties of composite films were also enhanced to some *** above results indicate that surface modification by chemically grafting polymer brushes is an effective method to improve two-phase interfacial compatibility so as to prepare composite film with enhanced properties.

关键词： Polyimide Composite film Boron nitride Thermal conductivity Interfacial compatibility

Correlation study between the polymorphism of repetitive sequence in gene CAG of androgen receptor and the occurrence and progression of prostate cancer

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2014年第4期7卷 301-304页

作者： Xiao-lei zhai Xiao-Wei Qu Liang Guo Qian-He Ha Department of Urology People's Hospital of Zhengzhou

Objective:To explore the relation between the polymorphism of repetitive sequence in gene CAG of androgen receptor(AR)and the susceptibility and clinical stages as well as pathological grading of prostate cancer among Han ***:Sixty-eight cases with prostate cancer hospitalized in Urinary Surgery Department from Feb.2010 to Feb.2012 and 60 healthy cases were chosen as research *** of PCR and direct sequencing were adopted to detect DNA sequence of AR gene and the length of repetitive sequence in ***:The lengths of repetitive sequence in CAG of patients with prostate cancer and healthy people were(22.3±4.6)and(23.0±4.9),respectively showing no statistical *** length(repetitive sequence of CAG)>22,those with that0.05);the proportion of patients with length<22 at clinical stage C-D was much larger than that of patients at clinical stage B(P<0.05),and as the aggravation of pathological grading,the proportion of patients with the length<22 was also remarkably increased and there was significant difference between patients with highly differentiated prostate cancer and those with poorly differentiated prostate cancer(P<0.05).Conclusions:There is correlation between the occurrence and development of prostate cancer in Han population and the polymorphism of repetitive sequence in gene CAG of androgen *** less the number of repetitive sequence in CAG is,the higher the risk of prostate cancer will be and the more severe the clinical stage and pathological grading will be.

关键词： Prostate cancer Androgen receptor Polymorphism of CAG Gene

Diffusion behavior of hydrogen isotopes in tungsten revisited by molecular dynamics simulations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第7期27卷 268-275页

作者： Mingjie Qiu lei zhai Jiechao Cui Baoqin Fu Min Li Qing Hou Key Laboratory for Radiation Physics and Technology（Ministry of Education） Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China

Molecular dynamics simulations were performed to study the diffusion behavior of hydrogen isotopes in single-crystal tungsten in the temperature range of 300-2000 K. The simulations show that the diffusion coefficient of H isotopes exhibits non-Arrhenius behavior, though this deviation from Arrhenius behavior is slight. Many-body and anharmonic effects of the potential surface may induce slight isotope-dependence by the activation energy; however, the dependence of the pre-factor of the diffusion coefficient on the isotope mass is diminished. The simulation results for H-atom migration near W surfaces suggest that no trap mutations occur for H atoms diffusing near either W{ 100} or W{ 111 } surfaces, in contrast to the findings for He diffusion near W surfaces. Based on the H behavior obtained by our MD simulations, the time evolution of the concentration distribution of interstitial H atoms in a semi-infinite W single crystal irradiated by energetic H projectiles was calculated. The effect of H concentration on H diffusion is discussed, and the applicability of the diffusion coefficients obtained for dilute H in W is assessed.

关键词： hydrogen isotopes tungsten diffusion molecular dynamics

Structures and aromaticity of the planar Al_2P_2^(n-) (n=1―4) clusters

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2009年第12期52卷 2237-2242页

作者： XU WenGuo,ZHANG YuanChun & zhai lei Institute of Chemical Physics,Beijing Institute of Technology,Beijing 100081,China Institute of Chemical Physics Beijing Institute of Technology Beijing China

Clusters Al2P2n-(n = 1―4) were theoretically investigated using density functional theory (DFT) methods at the B3LYP/6-311+G* and B3PW91/6-311+G* levels of theory. The calculated results showed that the planar structure (D2h symmetry) of Al2P2n-(n = 1―4) species was the global minimum. And the negative nucleus-independent chemical shift (NICS) value of Al2P2n-(n = 1―4) species indicated the existence of a ring current in the planar structure (D2h symmetry). A detailed molecular orbital (MO) analysis revealed that the planar structures (D2h symmetry) had π aromaticity,which further exhibited the strongly aromatic character for Al2P2n-(n = 1―4) species.

关键词： DFT calculation geometric structure nucleus-independent chemical shift molecular orbital

Effect of Aggregation Structure on Thermal Expansion Behavior of Polyimide Films with Different Thickness

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第12期40卷 1651-1661,I0010页

作者： Chang-Ou Wang lei zhai Song Mo Yi Liu Meng-Yan Gao Yan Jia Min-Hui He Lin Fan Key Laboratory of Science and Technology on High-tech Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Polyimide films derived from representative PMDA/ODA were prepared with thickness ranging from 5 μm to 25 μm,and the effect of aggregation structure on thermal expansion behavior along different directions was *** in-plane and out-of-plane linear thermal expansion(CTEand CTE) were respectively characterized by thermal mechanical analysis and FT-near-IR interference *** and anisotropic behavior of thermal expan sion were also *** increasing film thickness,CTEgradually increased from 32.2 ppm/℃ to46.1 ppm/℃ while CTEdecreased from 149.7 ppm/℃ to 128.2 ppm/℃.Volumetric thermal expansion of polyimide films was less sensitive to the va ried thickness,but anisotropy of thermal expansion was *** film of 5 μm thickness showed large birefringence,indicating more considerable in-plane chain orientation ***,molecular chains were more densely packed along in-plane direction when film thickness increased,while became loosely stacked in the out-of-plane *** contrast to the enhanced lateral chain packing for thicker film s,higher vertical chain packing order was found in thinner *** variation of aggregation structure during thermal expansion procedure was analyzed by temperature-dependent *** is proved that thermal expansion behavior of thinner films could be largely attributed to molecular chain packing,whereas that may be influenced by many factors for thicker films in addition to the effect of chain *** results revealed that thermal expansion of films with thickness variation is closely related to molecular chain orientation and packing,which is associated with both chemistry and morphological structure of polyimide.

关键词： Polyimide film Thermal expansion behavior Aggregation structure Molecular chain packing Thickness variation