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Photochemistry of chrysene adsorbedon several types of particle

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Journal of Environmental Sciences 1995年第2期7卷 233-239页

作者： Zhong Jinxian Mauldin R. F. Dunstan , T. D. T ,Sanders, J. K. , Hipps, A. D. , Wehry, E. L. , Mamantov, G(Departrnent of chemistry , University of Tennessee , Knoxville , TN37996 , USA) dept.of chemistry Univ of Tennessee Knoxville TN USA United States

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关键词： photochemistry chrysene half-lives particles.

Infrared, Diffuse Reflectance and Dielectric Studies ofAntimony Trisulphide

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Journal of Materials Science & Technology 1998年第4期14卷 344-348页

作者： Hanafi, Z.M. Ismail, F.M. Khalil, M.Sh. Inorganic chemistry dept. National Research Centre Dokki Cairo Egypt

Infrared absorption spectra of orange, black and transferred Sb//2S//3 samples have been studied in the spectral range 200-4000 cm** minus **1. The pronounced difference between the different samples is the appearance of excess sulphur present in the orange and transferred samples except those of transferred at 543 K and the black Sb//2S//3. The change of sharpness of some IR peaks reveals the amorphous/crystalline change. The effect of the degree of crystallinity and stoichiometry on the energy gap values was investigated by using optical method. The obtained dielectric parameters epsilon prime and epsilon double prime of the different samples are thoroughly affected by the degree of crystallinity and smoothly affected by either the frequency or the temperature or both, except at lower frequencies. (Edited author abstract) 26 Refs.

关键词： Antimony compounds

Pitting Corrosion Behaviour of Monel-400 Alloy in Chloride Solutions

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Journal of Materials Science & Technology 1999年第3期15卷 208-212页

作者： V.K.Gouda I.Z.Selim A.A.Khedr and A.M.Fathi(Physical chemistry dept., National Research Centre, Dokki, Cairo, Egypt) Physical chemistry dept. National Research Centre Dokki Cairo Egypt

Pitting corrosion behaviour of Monel-400 alloy in 3.5 wt pct NaCl sodium chloride solution has been investigated using the cyclic potentiodynamic anodic polarization technique. The effect of chloride ion concentration, pH values and difFerent temperatures on the pitting parameters were determined. The morphology of the pits produced after anodic polarization treatments was inspected by scanning electron microscope (SEM). The results indicated that, the increase in chloride ion concentration shifts Epit and Eprot of the alloy toward negative values and the pitting potential is much more dependent on pH value in the basic region. The breakdown of passivity with increasing temperature may be due to kinetic changes of passivating films and dissolution rate of the alloy in its passive state

关键词： Figure Pitting Corrosion Behaviour of Monel-400 Alloy in Chloride Solutions

Corrosion Behaviour and Chloride Attack of Reinforcing Steel in Presence of Concrete Admixtures

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Journal of Materials Science & Technology 1998年第4期14卷 339-343页

作者： I.Z.Selim (Physical chemistry dept., National Research Center, Dokki, Cairo, Egypt Physical chemistry dept. National Research Center Dokki Cairo Egypt

Corrosion and electrochemical behaviour of reinforcing steel embedded in cement pastes with and without concrete admixtures used in Egypt to modify concrete properties have been studied. The influence of the admixtures on the corrosion resistance of the steel against chloride attack has been studied by using impressed current and impressed voltage techniques. The results indicate that the type and concentration of the used admixture have an important effect on the extent of chloride induced corrosion of the steel. The mechanism of corrosion of steel due to chloride attack was discussed. (Edited author abstract) 16 Refs.

关键词： SCE Corrosion Behaviour and Chloride Attack of Reinforcing Steel in Presence of Concrete Admixtures Res

Binderless Carbon/Graphite Materials

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Journal of Materials Science & Technology 1997年第3期13卷 184-188页

作者： Zhou, SM Xia, JT Yan, LC dept. of chemistry and Chemical Engineering Hunan University Changsha 410082 China

High performance binderless carbon bodies can be manufactured from the mesophase raw material derived from petroleum pitch, which is ground into fine powders less than 10 mu m, and directly moulded, then sintered at 1000 degrees C without any kind of binder. The sintered bodies have a bulk density of 1.69 g/cm(3), bending strength of 91.2 MPa. Shore hardness of 100, porosity of only 7.2%, and electrical resistivity of 60x10(-6) Omega m. The bodies graphitized at 2800 degrees C have a bulk density of 1.88 g/cm(3), bending strength of 82 MPa. Shore hardness of 85, porosity of 5.4%, and electrical resistivity of 12x10(-6) Omega m. The scanning electron micrographs of the section show that the bodies possess an extremely dense and homogeneous structure. Infra-red spectrum analysis shows that carbonyls introduced when ground or activated are one of the key factors determining the selfbinding and selfsintering properties of the mesophase fine powders, and the structure and strength of the sintered bodies.

关键词： Carbon

Effect of inorganic additives on physical and chemical properties of PEO-LiClO_4 polymer electrolyte for lithium-ion batteries

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Journal of Harbin Institute of Technology(New Series) 2009年第6期16卷 869-872页

作者：顾大明李已才杨柳王淑堂 dept. of chemistry Harbin Institute of Technology

Inorganic additives-added PEO-based solid composite polymer electrolyte (SCPE) was prepared using solution casting method. The effects of LiNi0.8Co0.2O2 on the physical and chemical properties of the electrolyte were investigated. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR) and differential scanning calorimetry (DSC). The electrochemical performances of SCPE were measured. Results show that properties of the SCPE are improved significantly by adding LiNi0.8Co0.2O2 into PEO polymer electrolyte. Its conductivity reaches 5×10-4 S/cm(25 ℃) while retaining good mechanical and processing properties.

关键词：聚合物电解质无机添加剂化学性质 PEO 锂离子电池物理傅立叶变换红外光谱仪氯酸锂

Modulation of the magnetic properties of gold-spinel ferrite heterostructured nanocrystals

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Nano Research 2020年第3期13卷 785-794页

作者： Elvira Fantechi Claudia Innocenti Giovanni Bertoni Claudio Sangregorio Francesco Pineider INSTM and dept of Chemistry and Industrial ChemistryUniversity of PisaPisa 56124Italy ICCOM-CNR Institute for the Chemistry of OrganoMetallic CompoundsSesto Fiorentino 50019Italy INSTM and dept of Chemistry aU.Schiffnt University of FlorenceSesto Fiorentino 50019Italy IMEM-CNR Institute of Materials for Electronics and MagnetismParma 43124Italy CNR-Istituto Nanoscienze Modena 41125Italy

The rational design of complex nanostructures is of paramount importance to gain control over their chemical and physical ***,magnetic-plasmonic heterostructured nanocrystals have been recognized as key players in nanomedicine as multifunctional therapeutic-diagnostic tools and in *** we show how the properties of gold-iron oxide heterostructured nanocrystals can be tuned by chemical doping of the magnetic *** divalent cations in the iron oxide were substituted with cobalt and manganese to obtain a general formula Au-MFe2O4(M=Fe,Co,Mn).Magnetic properties of the heterostructures could be tuned,while maintaining well-defined plasmon resonance signatures,confirming the dual magnetic-plasmonic functional capability of these nanostructures.

关键词： heterostructured nanocrystals seeded-growth spinel ferrites magnetic-plasmonic nanoparticles

AN ARRAY CAPILLARY IN-TUBE SOLID PHASE MICROEXTRATION TECHNIQUE

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AN ARRAY CAPILLARY IN-TUBE SOLID PHASE MICROEXTRATION TECHNI...

FDTD analysis to simulate interaction between microwave and chemical reaction

第十三届北京分析测试学术报告会暨展览会(BCEIA2...

作者： Yafeng GUAN Lijuan NI Hua WANG Jie CHEN dept.of Instrumentation & Analytical chemistry Key Lab of Separation Science for Analytical ChemistryCASDalian Institute of Chemical PhysicsChinese Academy of Sciences

An array capillary in-tube solid phase microextration(ACIT-SPME)technique was developed and *** ACIT-SPME device was consisted of a bundle of capillary tubing set in a glass *** inside/outside surface of capillary tubing and the inner surface of glass liner were all coated with thin layer of extraction *** extraction surface area of the ACIT-SPME was increased about 3 orders of magnitude than fiber SPME while the thickness of the phase is only a few micrometers,which reduce the extraction time down to 105 *** aromatic hydrocarbons in water were determined by using this new techique coupled to a gas *** limits of detection were0.008.046μg/L,with RSDs of 2.31%.The linear range were up to 0.500μg/L with correlation coefficients of 0.996.999 except for *** were in the range of 71.903.0%at added 20μg/L *** in tap water was analyzed by using the new method.

关键词： array capillary in-tube solid phase microextration Polycyclic Aromatic Hydrocarbons gas chromatography

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FDTD analysis to simulate interaction between microwave and ...