检索结果-南通市图书馆

Plasma Science and Technology 2011年第2期13卷 230-234页

作者：赵国巍高俊萍高强陈亚芍 key laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University) Ministry of Education School of Chemistry and Materials Science key laboratory of Modern Preparation of TCM Ministry of Education Jiang Xi University of Traditional Chinese Medicine School of Pharmacy Fourth Military Medical University

Enhancement of the surface hydrophilicity of biodegradable poly （D,L-lactic acid）（PLA） films is studied. The PLA films were treated by nitrogen plasma （PLA-N2） and nitro- gen/hydrogen plasma （PLA-N2/H2）, respectively. The surface properties and microstructure of PLA-N2 and PLA-N2/H2 were studied by static contact angle measurement, surface free energy calculation, X-ray photoelectron spectroscopy （XPS） and atomic force microscopy （AFM）. It is confirmed that the surface hydrophilicity of PLA-N2 and PLA-N2/H2 was higher than that of pristine PLA, and the surface hydrophilicity of PLA-N2 films was better than that of PLA-N2/H2.

关键词： plasma surface modification PLA films hydrophilicity

Determination of tetraethyl ammonium by ion-pair chromatography with indirect ultraviolet detection using 4-aminophenol hydrochloride as background ultraviolet absorbing reagent

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第2期25卷 201-204页

作者： Chun-Miao Zou Hong Yu Miao-Yu Wang College of Chemistry and Chemical Engineering Harbin Normal University and Key Laboratory of Photonic and Electronic Bandgap MaterialsMinistry of Education

A method was developed for the determination of tetraethyl ammonium （TEA） by reversed-phase ion- pair chromatography with indirect ultraviolet detection, Chromatographic separation was achieved on a reversed-phase C18 column using background ultraviolet absorbing reagent - ion-pair reagent - organic solvent as mobile phase. The effects of the background ultraviolet absorbing reagents, detection wavelength, ion-pair reagents, organic solvents and column temperature on the determination method were investigated and the retention rules discussed. Results found that TEA could be successfully analyzed by using 0.7 mmol/L 4-aminophenol hydrochloride and 0.15 mmol/L 1-heptanesulfonic acid sodium mixed with 20% （v/v） methanol as mobile phase at a UV detection wavelength of 230 nm. Under these conditions, the retention time of tetraethyl ammonium was 2.85 min. The detection limit （S/N = 3） for TEA was 0.06 mg/L. The relative standard deviations （n = 5） for peak area and retention time were 0.35% and 0.02%, respectively. The method has been successfully applied to the determination of synthesized tetraethyl ammonium bromide. Recovery of tetraethyl ammonium after spiking was 99.1%.

关键词： Ion-pair chromatography Indirect ultraviolet detection Tetraethyl ammonium 4-Aminophenol hydrochloride

Synthesis of amidines via iron-catalyzed dearomative amination of β-naphthols with oxadiazolones

在线全文

学校读者我要写书评

暂无评论

Organic Chemistry Frontiers 2022年第2期9卷 380-385页

作者： Yan-Hui Fan Xiao-Yu Guan Wen-Pei Li Cheng-Zhou Lin De-Xian Bing Mei-Zhi Sun Guo Cheng Jing Cao Jun-Jie Chen Qing-Hai Deng The education ministry key Lab of Resource Chemistry Joint International Research Laboratory of Resource ChemistryMinistry of EducationShanghai Key Laboratory of Rare Earth Functional Materialsand Shanghai Frontiers Science Center of Biomimetic CatalysisCollege of Chemistry and Materials ScienceShanghai Normal UniversityShanghai 200234China

An iron-catalyzed dearomative amination of β-naphthols via a nitrene-transfer process has been ***,which have rarely been applied for the synthesis of amidines,are used as the nitrene source.A variety of amidines bearing β-naphthalenone moieties were generated smoothly in good to high yields(up to 98%)in the presence of 1.5 equivalents of tetrabutylammonium bromide,which was added as an essential additive.

关键词： catalyzed smoothly additive

Affinity adsorption mechanism studies of adsorbents C1-Zn(Ⅱ) for uremic middle molecular peptides containing Asp-Phe-Leu-Ala-Glu sequence

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

Science China Chemistry 2011年第2期54卷 375-379页

作者： LI PingLin FU LiXue QIAO YiTao ZHAO JianXin WANG Wei&YUAN Zhi key laboratory of Functional Polymer materials Ministry of EducationInstitute of Polymer ChemistryNankai UniversityTianjin 300071China

To exploit efficient adsorbents for removing middle molecular peptides containing DFLAE (DE5, a typical peptide sequence accumulated in uremic serum) sequence by hemoperfusion, we designed and synthesized three affinity adsorbents (C1-Zn^2+, C2-Zn^2+ and C3-Zn^2+) that could have high affinity to DE5. Subsequently, we evaluated the corresponding adsorption ability of each adsorbent by static adsorption experiments and isothermal titration calorimetry (ITC). The results showed that C1-Zn^2+ bad the best adsorption ability to DE5-containing peptides and the adsorption capacity for DE5 was 8.52 mg/g. By changing the adsorption conditions, the adsorption mechanism was elucidated. The main driving force of the adsorption is metal-carboxyl coordination and the hydrophobic force affords the cooperative effect. It is expected that our present work can provide basic understanding for the design of adsorbents with high affinity and selectivity towards oligopeptides.

关键词： affinity adsorbent adsorption mechanism middle molecular peptides

Design of high-temperature superconductors at moderate pressures by alloying AlH3 or GaH3

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第1期9卷 94-103页

作者： Xiaowei Liang Xudong Wei Eva Zurek Aitor Bergara Peifang Li Guoying Gao Yongjun Tian Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China School of materials Science and Engineering Henan University of TechnologyZhengzhou 450001China Department of Chemistry State University of New York at BuffaloBuffaloNew York 14260-3000USA Physics Department and EHU Quantum Center University of the Basque CountryUPV/EHU48080 BilbaoSpain Donostia International Physics Center(DIPC) 20018 DonostiaSpain Centro de Física de Materiales CFM Centro Mixto CSIC-UPV/EHU20018 DonostiaSpain Extreme Conditions Physics Research Team College of Physics and Electronic InformationInner Mongolia Minzu UniversityTongliao 028043China

Since the discovery of hydride superconductors,a significant challenge has been to reduce the pressure required for their *** this context,we propose that alloying could be an effective strategy to achieve *** focus on a series of alloyed hydrides with the AMH_(6)composition,which can be made via alloying A15 AH_(3)(A=Al or Ga)with M(M=a group IIIB or IVB metal),and study their behavior under *** of them are predicted to maintain the A15-type structure,similar to AH_(3)under pressure,providing a platform for studying the effects of alloying on the stability and superconductivity of AH_(3).Among these,the A15-type phases of AlZrH_(6)and AlHfH_(6)are found to be thermodynamically stable in the pressure ranges of 40–150 and 30–181 GPa,***,they remain dynamically stable at even lower pressures,as low as 13 GPa for AlZrH_(6)and 6 GPa for AlHfH_(6).These pressures are significantly lower than that required for stabilizing A15 ***,the introduction of Zr or Hf increases the electronic density of states at the Fermi level compared with *** enhancement leads to higher critical temperatures(Tc)of 75 and 76 K for AlZrH_(6)and AlHfH_(6)at 20 and 10 GPa,*** the case of GaMH_(6)alloys,where M represents Sc,Ti,Zr,or Hf,these metals reinforce the stability of the A15-type structure and reduce the lowest thermodynamically stable pressure for GaH_(3) from 160 GPa to 116,95,80,and 85 GPa,*** noteworthy are the A15-type GaMH_(6)alloys,which remain dynamically stable at low pressures of 97,28,5,and 6 GPa,simultaneously exhibiting high Tc of 88,39,70,and 49 K at 100,35,10,and 10 GPa,***,these findings enrich the family of A15-type superconductors and provide insights for the future exploration of high-temperature hydride superconductors that can be stabilized at lower pressures.

关键词： alloying alloys superconductors

Effect of a Magnetic Field on the Preparation of Silver Nanowires Using Solid Electrolyte Thin Films

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 materials Science & Technology 2007年第1期23卷 39-42页

作者： Haifei YAO Jialin SUN Wei LIU Hongsan SUN laboratory of advanced materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China key laboratory of Atomic and Molecular Nanosciences of education ministry and Department of Physics Tsinghua University Beijing 100084 China Computer Aided Architecture Design laboratory Tsinghua University Beijing 100084 China

The effect of an external magnetic field on the preparation of silver nanowires was studied. The silver nanowires were synthesized using solid electrolyte RbAg4I5 thin films by applying both a direct current （DC） electric field and a magnetic field. The RbAg4I5 thin films, which were prepared by deposition at room temperature and atmospheric pressure on a NaCI substrate, were used for the transfer of Ag^＋ ions between two Ag electrodes during the preparation process. When only the DC electric field is applied, the silver ions migrate toward the cathode. On the edge of the silver film at the cathode the Ag^＋ ions congregate to form aligned nanowires. If the magnetic field is also applied perpendicular to the DC electric field, the morphology of the nanowires can be controlled by rotating the sample in the magnetic field. Experimental results show that the growth of the silver nanowires is determined by the Ag^＋ ionic flux.

关键词： Silver nanowires Solid electrolyte Magnetic field

An Improved Process for Bifacial n-PERT Solar Cells Fabricated with Phosphorus Activation and Boron Diffusion in One-step High Temperature

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(materials Science) 2022年第6期37卷 1056-1060页

作者： LIU Renjie YIN Lu ZHOU Yichun key laboratory of Low Dimensional materials and Application Technology of ministry of education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China

The bifacial n-PERT(Passivated Emitter Rear Totally diffused)solar cells were fabricated using a simplified process in which the activation of ion-implanted phosphorus and boron diffusion were performed simultaneously in a high-temperature *** further efficiency improvement,the rear side doping level was regulated by applying two different implantation doses and the chemical etching step of boron rich layer(BRL)was added,and their effects on cell performance were *** solar cells average efficiency reaches 20.35%with a bifaciality factor of 90%by optimizing rear side doping level,which can be explained by the decrease of Auger *** it is further enhanced to 20.74%by removing the front side BRL due to the improvement of surface passivation and bulk *** improved fabrication process possesses the advantages of low complexity and cost and high cell efficiency and bifaciality factor which could provide a promising way to the commercial production of bifacial n-PERT solar cells.

关键词： n-PERT solar cells ion implantation diffusion bifacial structure

Atomic modulation of Fe‐Co pentlandite coupled with nitrogen‐doped carbon sphere for boosting oxygen catalysis

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2022年第6期43卷 1502-1510页

作者： Si‐Jie Li Yong Xie Bi‐Lin Lai Yingmin Liang Kang Xiao Ting Ouyang Nan Li Zhao‐Qing Liu Institute of Clean Energy and materials Guangzhou Key Laboratory for Clean Energy and MaterialsMinistry of EducationSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou Higher Education Mega CenterGuangzhou 510006GuangdongChina

Reversible oxygen reaction plays a crucial role in rechargeable battery systems,but it is limited by the slow reaction ***,the ionic modulation of cobalt pentlandite coupled with nitrogen‐doped bowl‐like hollow carbon sphere is well designed on octahedral and tetrahedral *** robust FexCo9−xS8‐NHCS‐V with iron replacing at the octahedron possesses prolonged metal sulfur bond and exhibits excellent bifunctional electrocatalytic performance towards oxygen reduction reaction(ORR,E_(1/2)=0.80 V ***)and excellent oxygen evolution reaction(OER,E_(j=10)=1.53 V ***)in 0.1 mol/L ***,a rechargeable Zn‐air battery of Fe_(x)Co_(9−x)S_(8)‐NHCS‐V cathode endows high energy efficiency(102 mW cm^(−2)),and a microbial fuel cell achieves a high‐power density(791±42 mW m^(−2)),outperforming the benchmark Pt/C catalyst.

关键词： Oxygen electrocatalysis Transition metal sulfide Nitrogen‐doped carbon Pentlandite structure Zinc‐air battery

Synthesis and Characterization of a New Ligand 2-(4, 5-Dihydro-2-thiazolyl)-6-methoxylbenzothiazole and Its Dinuclear Co(II) Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2010年第11期29卷 1712-1716页

作者：校大伟张斌李剑利史真 key laboratory of Synthetic and Natural Functional Molecule Chemistry of the ministry of education College of Chemistry & Materials ScienceNorthwest University

A new ligand 2-（4,5-dihydro-2-thiazolyl）-6-methoxyl benzothiazole and its new dinuclear Co（II） coordination complex [Co（C11H10N2OS2）Cl2]2·2CHCl3 （1） have been synthesized and characterized. Complex 1 was synthesized by the reaction of Co（II） salt with 2-（4,5-dihydro- 2-thiazolyl）-6-methoxyl benzothiazole under room-temperature evaporation condition and struc- turally characterized by single-crystal X-ray diffraction analysis and IR spectroscopy. The supramolecular network of complex 1 is stabilized by the presence of intermolecular interaction, such as C-H···Cl hydrogen bonding and π-π stacking. The complex crystallizes in triclinic, space group P1 with a = 8.3288（12）, b = 10.5273（15）, c = 10.822（2）, α = 93.416（3）, β = 90.864（3）, γ = 94.890（3）o, V = 943.60（2）3, Z = 2, Dc = 1.758 g/cm3, F（000） = 498 and μ = 1.840 mm-1. The final complex [Co（C11H10N2OS2）Cl2]2·2CHCl3 is a diplex bridged dinuclear complex consisting of two Co（II） ions, two ligands, two bridging Cl- anions and two terminal Cl- anions.

关键词： benzothiazole dinuclear complex X-ray crystal structure

Polyacrylamide hydrogels with phenylboronic acid moieties for the imprinting of proteins

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第12期21卷 1487-1489页

作者： Yan Wang Zhi Hua Chai Hong Yan He Yi Zhe Jiang Guo Qi Fu key laboratory of Functional Polymer materials of ministry of education Institute of Polymer Chemistry Nankai University Tianjin 300071 China

In this letter,N-acryloyl-3-aminophenylboronic acid（AAPBA） was synthesized and then examined as a new functional monomer for protein *** was allowed to be copolymerized with acrylamide to produce hemoglobin- or lysozyme-imprinted *** template rebinding tests,the imprinted gels showed significant increase in the specific binding with the increase of the AAPBA amounts in the prepolymerization *** results indicate that AAPBA may be a useful functional monomer for its moderate interactions with protein molecules.

关键词： Protein imprinting Hydrogels Hemoglobin Lysozyme 3-Aminophenylboronic acid