Gautam Agnihotri、Yung-nan Liu、Beth M. Paschal 等 4 位作者2004-10-12Biochemistry
CDP-6-deoxy-L-threo-D-glycero-4-hexulose-3-dehydrase (E(1)) catalyzes the C-3 deoxygenation in the biosynthesis of 3,6-dideoxyhexoses in Yersinia pseudotuberculosis. E(1) is a pyridoxamine 5'-phosphate (PMP)-dependent enzyme that also contains a [2Fe-2S] center. This iron-sulfur cluster is catalytically essential, sin…
Enzyme Structure and FunctionPorphyrin Metabolism and DisordersAmino Acid Enzymes and Metabolism
Hong‐Wen Wang、Kung‐Chin Chang、Hsuan‐Chih Chu2004-10-12Polymer International
Abstract Clay‐dispersed poly(styrene‐ co ‐acrylonitrile) nanocomposites (PSAN) were synthesized by a free radical polymerization process. The montmorillonite (MMT) was modified by a cationic surfactant hexadecyltrimethylammonium chloride. The structures of PSAN were determined by wide‐angle X‐ray diffraction and FTIR…
Polymer Nanocomposites and PropertiesDielectric materials and actuatorsPolymer Nanocomposite Synthesis and Irradiation
Chen Zhang、Shengyu Feng2004-10-12Polymer International
Abstract A series of liquid polyester polyols (PEs) from adipic acid (AA), phthalic anhydride (PA) and trihydroxymethylpropane (TMP), and such glycols as ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG), butanediol (BD) and hexanediol (HD), were prepared. Polyurethanes (PUs) were obtained from t…
Polymer Nanocomposites and PropertiesPolymer composites and self-healingSynthesis and properties of polymers
Xiaorong Wang、Victor J. Foltz2004-10-12The Journal of Chemical Physics
In an effort to provide evidence concerning the conformation of many chains in strict two-dimensional (2D) dense state, we synthesized polymer chains of diameter of nanometers through an anionic polymerization process. The conformational characteristics of the long chain molecules in films of thickness h corresponding…
Material Dynamics and PropertiesSurfactants and Colloidal SystemsElectrostatics and Colloid Interactions
Hiroki Takeshita、Naoto Ishii、Chie Araki 等 6 位作者2004-10-12Journal of Polymer Science Part B Polymer Physics
Abstract Formation of higher‐order structure in crystallization from microphase‐separated melts was studied for polystyrene–polyethylene (PS–PE) diblock copolymers and PS–PE–PS triblock copolymers with time‐resolved synchrotron small‐angle X‐ray scattering (SR–SAXS) techniques. The PE block was crystallized at tempera…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesBlock Copolymer Self-Assembly
Qian‐Shu Li、Caihong Feng、Qingze Jiao 等 6 位作者2004-10-12physica status solidi (a)
Shape-controllable yttria nanocrystals were synthesized through a simple hydrothermal pattern. The shape of nanoparticles, nanoflakes, and nanorods can be controlled by the pH value. X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were used to characterize the pr…
Quantum Dots Synthesis And PropertiesPhotonic Crystals and ApplicationsElectrophoretic Deposition in Materials Science
Zheng‐liang Zhi、Donald T. Haynie2004-10-12Macromolecules
Aspects of poly( l -lysine) (PLL) and poly( l -glutamic acid) (PLGA) multilayer thin film assembly, physical properties of the films, and changes in film structure on pH shift have been studied by far-UV circular dichroism spectroscopy (CD), ultraviolet spectroscopy (UVS), ellipsometry, quartz crystal microbalance (QC…
Surface Modification and SuperhydrophobicityPolymer Surface Interaction StudiesNanofabrication and Lithography Techniques
Ellen H. G. Backus、A. Eichler、Mihail L. Grecea 等 5 位作者2004-10-12The Journal of Chemical Physics
We present an experimental and theoretical investigation of the adsorption, desorption, and dissociation of NO on the stepped Pt (533) surface. By combining temperature programmed desorption and reflection absorption infrared spectroscopy, information about the adsorption sites at different temperatures is obtained. S…
Advanced Chemical Physics StudiesCatalytic Processes in Materials Sciencenanoparticles nucleation surface interactions
Xiaowen Cui、Weihua Li、Deyue Yan2004-10-12Polymer International
Abstract The crystalline transition behavior of polyamides X 18, where X = 2, 4, 6, 8, 10 and 12, has been studied by variable‐temperature wide‐angle X‐ray diffraction (WAXD) and real‐time Fourier‐transform infrared (FTIR) spectroscopy. It was found that polyamides 2 18 and 4 18 undergo the Brill transition on heating…
Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesPolymer composites and self-healing
Yongfeng Jia、K. Mark Thomas2004-10-12The Journal of Physical Chemistry B
The adsorption of dicyanoaurate(I) complexes on nanoporous carbon is widely used for the recovery of gold in the extractive metallurgy industry. However, there is no agreement on the adsorption mechanism concerning the nature of the adsorbed species on carbon surface. A novel experiment was designed in this study by t…
Analytical chemistry methods developmentElectron and X-Ray Spectroscopy TechniquesIon-surface interactions and analysis
Jaroslav Stejskal2004-10-12Polymer International
Abstract Chemical heterogeneity can influence the properties of statistical copolymers. It is shown that any integral property of a copolymer will depend on the chemical heterogeneity if such a property is a non‐linear function of copolymer composition. This is illustrated by means of the conductivity of copolymers of…
Advanced Battery Materials and TechnologiesConducting polymers and applicationsElectrochemical Analysis and Applications
M. Mihalik、Jana Vejpravová、Ján Rusz 等 7 位作者2004-10-12Physical Review B
We report on the results of low-temperature magnetization, specific-heat, and resistivity measurements on a $\mathrm{Tb}{\mathrm{Fe}}_{2}{\mathrm{Si}}_{2}$ single crystal in magnetic fields up to $5\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ applied parallel to the principal crystallographic axes. We conclude that $\mathrm…
Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsIron-based superconductors research
Lijun Zhao、Hua Yang、Lianxiang Yu 等 7 位作者2004-10-12physica status solidi (a)
Ni0.7Mn0.3LaxFe2–xO4 (x = 0, 0.04, 0.06, 0.08, 0.1) ferrite powders with nanosize well-developed spinel phases were prepared by the emulsion method. The growth of particles, the structure and the magnetic properties were investigated by X-ray diffraction (XRD), Mössbauer spectroscopy and a vibrating sample magnetomete…
Magnetic Properties and Synthesis of FerritesMagnetic Properties of AlloysElectrical and Thermal Properties of Materials
S.S. Ata‐Allah、M. E. Kaiser2004-10-12physica status solidi (a)
The electrical properties of Cu-substituted Ni–Mn ferrite Ni1–xCuxMnyFe2–yO4 (with 0.0 ≤ x ≤ 1.0 and y = 0.6) are investigated by ac conductivity measurements in the frequency range 102–105 Hz and over the temperature range 300–730 K. The results obtained for these materials reveal a semiconductor-to-metallic transiti…
Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesElectromagnetic wave absorption materials
Jane F. Brown、Ian Rhoney、Richard A. Pethrick2004-10-12Polymer International
Abstract The preparation and properties of a series of nanocomposite materials obtained using different organically modified montmorillonite clays with a simple epoxy resin are reported. Dynamic mechanical thermal analysis is used to assess the effect of the incorporation of the clay platelets into the matrix of the p…
Polymer Nanocomposites and PropertiesEpoxy Resin Curing ProcessesSynthesis and properties of polymers
S. Shotwell、Paul M. Windscheif、Mark D. Smith 等 4 位作者2004-10-12Organic Letters
The synthesis, optical properties, and solid-state structures of a series of o-(aryleneethynylene) oligomers containing three to seven aryl units is described. The main chain in all examples is composed of between one and five 4,5-dimethoxybenzene rings which are capped on each end by 2-pyridyl rings. These oligomers…
Luminescence and Fluorescent MaterialsSynthesis and Properties of Aromatic CompoundsOrganoboron and organosilicon chemistry
P. Ballone、R. Jones2004-10-12The Journal of Chemical Physics
A force field model of phosphorus has been developed based on density functional (DF) computations and experimental results, covering low energy forms of local tetrahedral symmetry and more compact (simple cubic) structures that arise with increasing pressure. Rules tailored to DF data for the addition, deletion, and…
Material Dynamics and PropertiesThermal and Kinetic AnalysisChemical Thermodynamics and Molecular Structure
S. B. Vakhrushev、Yu. A. Kumzerov、A. V. Fokin 等 7 位作者2004-10-12Physical Review B
Whereas the $^{23}\mathrm{Na}$ spin-lattice relaxation rate ${T}_{1}^{\ensuremath{-}1}$ of microconfined ${\mathrm{NaNO}}_{2}$ in the ferroelectric phase is similar to the one of bulk ${\mathrm{NaNO}}_{2}$, there is a striking difference in the paraelectric phase. Instead of decreasing, the relaxation rate here increa…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsAcoustic Wave Resonator Technologies
Matthieu Paillet、Vincent Jourdain、P. Poncharal 等 10 位作者2004-10-12The Journal of Physical Chemistry B
Discrete nickel catalyst nanoparticles (NP) have been used to grow isolated single-walled carbon nanotubes by chemical vapor deposition (CVD). Atomic force microscopy (AFM), transmission electron microscopy (TEM) and micro-Raman spectroscopy are used to characterize these as-grown, isolated nanotubes. Using a conventi…
Carbon Nanotubes in CompositesGraphene research and applicationsNanotechnology research and applications
Yuji Koyama、Hideki Tanaka、Guangtu Gao 等 4 位作者2004-10-12The Journal of Chemical Physics
A method of free energy calculation is proposed, which enables to cover a wide range of pressure and temperature. The free energies of proton-disordered hexagonal ice (ice Ih) and liquid water are calculated for the TIP4P [J. Chem. Phys. 79, 926 (1983)] model and the TIP5P [J. Chem. Phys. 112, 8910 (2000)] model. From…
Phase Equilibria and ThermodynamicsHigh-pressure geophysics and materialsMaterial Dynamics and Properties