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。
Abstract The tetragonal single crystal, H 3 PMo 12 O 40 ⋅29H 2 O, is considered here as a model system to describe multielectron redox reactions of Keggin type phosphododecamolybdate. Electrochemical experiments have been performed in solid‐state, i.e. in the absence of contact with liquid electrolyte phase, and they…
Disclinations in nematic liquid crystals usually adopt a straight shape in order to minimize their elastic energy. Once created in the course of a nonequilibrium process such as a temperature quench from the isotropic to the nematic phase, the topologically stable disclinations of half-integer strength either annihila…
Abstract SOFC systems, working at high temperatures of about 800 °C, have recently attracted significant interest for application as automotive and stationary power supply systems, based on gasoline or diesel heating. For periodically changing operation, the thermal management of the system, including start‐up and loa…
Strontium barium niobate is a tungsten-bronze ferroelectric crystal having a tetragonal unit cell. Low-temperature x-ray diffraction studies were performed on a single crystal of Sr0.75Ba0.25Nb2O6 to determine the thermal expansivity along the a- and c-axes. Negative thermal expansion was observed along the c directio…
We apply a variety of characterization tools, including dynamic light scattering (DLS), transmission electron microscopy (TEM), high-resolution size-exclusion chromatography (HRSEC), and X-ray fluorescence (XRF), to study CdSe and CdSe/ZnS semiconductor nanocrystals of various sizes. We compare the size monodispersity…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTOne-Pot Process of Preparing Long Chain Branched Polypropylene Using C2-Symmetric Metallocene Complex and a "T" ReagentJ. Langston, J. Y. Dong, and T. C. ChungView Author Information Department of Materials Science and Engineering,…
In this paper we investigate the powder size dependences of the high-power piezoelectric properties in Pb[(Zr 0.52 Ti 0.48 ) 0.95 (Mn 1/3 Nb 2/3 ) 0.05 ]O 3 (PMnN–PZT) ceramics using the constant voltage method and the pulse drive technique. It has been demonstrated that coarse powders enlarge the grain sizes of the s…
Anodized aluminium oxide (AAO) with self-organized and ordered nano-hole arrays may be a good candidate for an irradiation mask to modify the properties of a nano-scale region. In order to use AAO as a mask for ion beam patterning, the ion beam transmittance of AAO should first be tested. In an AAO with a high aspect…
This paper describes the impact and compression properties of waste silk fabric/epoxy composites with reference to the effect of varying waste silk fabric content within them. Maximum strength in the properties determined is observed for the optimum fabric loading. Properties like density, void content, and weight red…
The electronic structure as a function of the chirality and deformations for various carbon nanotori is theoretically investigated by the tight-binding method. It has been found that for the various metallic tori the deformation-dependent energy gap displays almost the same changing features versus the deformations, w…
In this paper the mechanism through which TiO 2 affects the magnetic power losses of iron excess polycrystalline MnZn-ferrites is investigated. It has been found that TiO 2 , on being diluted in the bulk of the grains, promotes the homogeneous accumulation of calcium and silicon along the grain boundaries, by providin…
Epitaxially grown V 2 O 3 (0001) thin films have been prepared with different surface terminations, as evidenced by atomically resolved scanning tunnelling microscopy and high-resolution electron energy loss spectroscopy (HREELS) phonon spectra. The spectral changes observed in valence band photoemission spectra and H…
The properties of Nd1?xBaxCoO3 (0?x?0.24) solid solutions were studied at non-ambient temperatures by x-ray and neutron powder diffraction methods as well as magnetization and resistivity measurements. All the samples have an orthorhombically distorted perovskite structure (Pbnm space group). It was found that composi…
Nematic liquid crystals have been shown to exhibit zenithal electro-optic bistability in devices containing sinusoidal and deformed sinusoidal gratings. Recently it has been shown that zenithal bistable states can also be supported at isolated edges of square gratings. In this paper, we present microscopic observation…
Poly- p -phenylenebenzobisoxazole (PBO) and carbon nanotubes have a fully conjugated rod-like backbone entailing excellent mechanical properties, thermo-oxidative stability and solvent resistance. Rigid-rod PBO is commonly processed by dissolving in methanesulfonic acid or Lewis acid. A multi-wall carbon nanotube (MWN…
Abstract Epoxy‐siloxane hybrids (bi‐continuous nanocomposites) were produced from mixtures of a silane‐functionalized resin and tetra‐ethoxysilane by the sol‐gel method. Absorption of tetrahydrofuran (THF) in thin samples was found to take place by a two‐stage process, consisting of an induction period and a subsequen…
The self-synthesis of tungsten oxide (W18O49) nanowires on sputter-deposited WCx films using a simple annealing/oxidization process was reported. It was found that thermal annealing of WCx films at 680°C for 30min in nitrogen followed by oxidation at 450°C for 30min in pure oxygen would yield dense and well-crystalliz…
We demonstrate here that single-crystal β-Ni(OH) 2 nanosheets can be selectively synthesized in large quantities through a facile hydrothermal synthetic method using aqueous nickel nitrate as the nickel source and sodium hydroxide as alkaline reagent. This attempt is based on the treatment of aqueous nickel nitrate wi…
YAlO 3 and NdGaO3 thermal expansion coefficients were measured using in situ powder x-ray diffraction in the temperature range of 28–650 °C. They exhibit a clear anisotropy: The expansion, quite similar along the [100] and [001] directions, is much lower along the [010] direction. The formation of cracks observed in Y…
Single crystalline ZnO thin films were heteroepitaxially grown on sapphire substrates by rf-magnetron sputtering. The ZnO films on sapphire A and C face were oriented along the (0001) direction, whereas the ZnO film on sapphire R face was oriented along the (11-20) direction. The rate of photoinduced hydrophilic conve…