Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Fine magnetite powders dispersed in polymer solution were encapsulated from an oil-in-water emulsion prepared by an emulsification process employing a porous glass membrane and subsequent evaporation of the solvent. Styrene-based copolymers were dissolved in a magnetic fluid, and then continuously pushed through the p…
The dipyrromethanecarbinol motif is a key component in rational routes to a wide variety of porphyrinic macrocycles. We have investigated the dipyrromethane-monocarbinol self-condensation and the dipyrromethane-dicarbinol + dipyrromethane condensation under four different acid-catalysis conditions and have characteriz…
The performance of electrochemical capacitors made of Sb (6 mol %)-doped xerogel electrodes and nonacidic aqueous electrolyte solutions, including 0.1-2 M KOH and has been studied as a function of the thermal history of the xerogel. With increasing calcination temperature, the capacitance per unit weight was found fir…
Single crystals of Ba9Rh8O24, grown from a molten potassium carbonate flux, crystallize in the spacegroup R3c with lattice parameters of a = 10.0899(4) and c = 41.462(2) A. Magnetic measurements on oriented single crystals reveal the existence of magnetic anisotropy.
An empirical extension, based on the Kirkwood–Fröhlich equation, of a molecular based second-order perturbation theory is proposed to calculate the relative permittivity of dipolar liquids and mixtures in terms of the molecular dipole moment, the refractive index, density and temperature. Using the resulting equation,…
The atomic positions of the silicon carbide (SiC) polytypes 6H and 4H differ slightly from an ideal tetrahedron. These small deviations can be investigated by X-ray diffraction of so-called 'quasiforbidden' reflections, which are very sensitive with respect to the extremely small variations in the structure. Neverthel…
The reaction of Al2Cl6 with an excess of Ph2Si(OH)2 in THF in the presence of pyridine yielded new anionic and cyclic aluminosiloxanes: the structure of the anionic complex is composed of separated pyridinium cations and aluminosiloxane anions with a tetrahedral arrangement around the Al atom, which is similar to that…
We report high pressure Raman studies on single wall carbon nanotube bundles under hydrostatic conditions using two different pressure transmitting media, alcohol mixture and pure water. The radial and tangential modes show a blue shift when SWNT bundle is immersed in the liquids at ambient pressures. The pressure dep…
Release properties from a wax matrix tablet was examined. To obtain basic release properties, the wax matrix tablet was prepared from a physical mixture of drug and wax powder (hydrogenated caster oil) at a fixed mixing ratio. Properties of release from the single flat-faced surface or curved side surface of the wax m…
A new Ni(III) compound, TlNiO3 has been prepared under high oxygen pressure. The pressure and temperature domain required to prepare pure TlNiO3 was found to be very narrow (P ≥ 7.5 GPa, 650 ≤ T ≤ 700 °C). TlNiO3 crystallizes in the GdFeO3-type perovskite structure with the following lattice parameters: a = 5.2549(1),…
A significant improvement (220%) is reported in the low voltage (2000 V) aging characteristics under cathodoluminescence (CL) excitation for ZnS phosphors coated with 1.0 wt % by the sol-gel technique. The formation of nanoscale uniform coating was confirmed by structural analysis. An improvement in chemical and therm…
Atomic force microscopy (AFM) was used to investigate the topographic characteristics of pitting sites during anodic galvanostatic etching of high-purity aluminum foils in hot baths containing HCl and Pit sites near pre-existing ridges formed by rolling are preferred, and the distribution of sites depends on the foil…
Yeast mitochondrial NAD(+)-specific isocitrate dehydrogenase is an octamer composed of four each of two nonidentical but related subunits designated IDH1 and IDH2. IDH2 was previously shown to contain the catalytic site, whereas IDH1 contributes regulatory properties including cooperativity with respect to isocitrate…
First-principles total energy calculations of the 2-nm clusters seen in high-perfection Al72Ni20Co8 decagonal quasicrystals demonstrate that chemical ordering between Al and transition metals in the central ring is energetically highly favorable. The chemical ordering introduces extensive structure relaxation and resu…
Introduction to the Rare Earths The Basics of Surface Structure Surface Structure Techniques Crystal Growth and Surface Preparation Rare-Earth Surface Science Quantitative Low-Energy Electron Diffraction Quantitative LEED Results Summary - Past, Present and Future.
The distributions for the activation energy E T and the capture cross section σ of deep levels were studied by spectral analysis of deep level transient spectroscopy (SADLTS) in order to characterize precisely the bulk traps and the interface states in the Pr- and Bi-type ZnO varistors. Three bulk traps (B1 ′ , B1 and…
Classical dynamics simulations, coupled directly with semiempirical molecular orbital theory, reveal some of the important oxidation chemistry occurring in single wall carbon nanotubes. Two chemisorption reactions, 1,2 and 1,4-cycloaddition with 1O2, are observed from the simulations, the latter determined as the kine…
The relationship between the pressure, volume, and temperature (PVT) of poly(vinylidene fluoride) homopolymers (PVDF) and poly(vinylidene fluoride)–hexafluoropropylene (PVDF–HFP) copolymers was determined in the pressure range of 200–1200 bar and in the temperature range of 40°C–230°C. The specific volume was measured…
The McMurry coupling of tris(5-formyl-2-thienyl)methanes affords novel cage molecules which are bicapped with tris(2-thienyl)methanes and where all the sulfur atoms of thienyl groups direct inward.
The henequen fiber/poly(hydroxybutyrate-co-hydroxyvalerate) resin (PHBV) interfacial shear strength was characterized by single-fiber fragmentation (SFF) (also called the single-fiber composite test) and microbond techniques. The surface microstructure and tensile properties of henequen fibers were characterized using…