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。
The electronic structures of the doped perovskite oxides, ${\mathrm{LaMn}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{O}}_{3} (x=0.0,$ 0.25, 0.5, 0.75, 1.0), are studied using density-functional methods. In the 0.25- and 0.75-doped system, metallic property is found, while for the 0.5-doped compound with both orthorh…
Abstract Thin film coating of CaCO3 crystals on a chitin fiber from CaCO3 solution in the presence of an acid-rich macromolecule leads to the fabrication of a novel type of organic/inorganic composites. Molecular interactions between functional groups of these organic matrices play a key role for this control of inorg…
The galvanostatic reduction of the nickel hydroxide electrode is known to proceed at two successive potentials without this phenomenon being well understood. In this paper we prove that this second discharge plateau is unrelated to oxygen reduction and that it can be observed in the absence of the γ‐NiOOH hydrated pha…
We report a synchrotron x-ray-scattering study of the magnetoresistive manganite ${\mathrm{La}}_{0.875}{\mathrm{Sr}}_{0.125}{\mathrm{MnO}}_{3}.$ At low temperatures, this material undergoes an x-ray-induced structural transition at which charge ordering of ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Mn}}^{4+}$ ions characteris…
Rh-exchanged Al−MCM-41 is studied for selective catalytic reduction (SCR) of NO by C 3 H 6 in the presence of excess oxygen. It shows a high activity in converting NO to N 2 and N 2 O at low temperatures. In situ FT-IR studies indicate that Rh−NO + species (1910−1898 cm -1 ) is formed on the Rh−Al−MCM-41 catalyst in f…
There is a need to better understand electrical ageing of solid insulating materials in dry environment and discharge-free conditions. Photons emitted by a stressed material give evidence of the generation of highly reactive molecular states that could control degradation reaction.
The interaction between the dendrimers poly(1,4-diaminobutane) DAB n ( n = 8, 16, 32, 64) and poly(pyrrolidone-1,4-diaminobutane) DAB n Py ( n = 8, 16, 32) with the surfactants sodium dodecyl sulfate (SDS), tetradecyltrimethylammonium bromide (TTAB), and hexaethyleneglycol monododecyl ether (C 12 EO 6 ) have been stud…
A computer simulation was performed to examine the role of extrinsic grain-boundary (GB) defects in the sliding of the {11, (101){131} symmetric tilt boundary in aluminium by means of an embedded-atom method potential. The sliding resistance of the equilibrium GB was determined from a computation of the dependence of…
Nonisothermal crystallization and melting behavior of poly(β-hydroxybutyrate) (PHB)–poly(vinyl acetate) (PVAc) blends from the melt were investigated by differential scanning calorimetry using various cooling rates. The results show that crystallization of PHB from the melt in the PHB–PVAc blends depends greatly upon…
Radiation-induced damage to homo-oligonucleotides is investigated by electron-stimulated desorption of neutral fragments from chemisorbed organic films. Six and 12 mers of cytidine phosphate (poly dCs) and thymidine phosphate (poly dTs) are chemisorbed from various solutions onto a crystalline gold substrate by a thio…
Thin films of nitrogenated amorphous carbon (a-CNx) were deposited on Si(100) substrates by reactive radio frequency sputtering using a gas mixture of Ar and N2 at a total working pressure of 3 mTorr. X-ray photoelectron spectroscopy (XPS) showed that the films consisted of amorphous carbon (a-C) containing a β-C3N4-l…
Formation of secondary phases and diffusion of cations in diffusion couples of yttria‐stabilized zirconia and lanthanum manganite substituted with 0 to 60 mol% strontium have been studied by scanning electron microscopy and energy dispersive X‐ray spectroscopy. Only the primary phases were observed after 120 h at 1200…
Drawable water-swollen cellulose films were prepared by coagulating in water two different cellulose organic solution systems. The drawability of the water-swollen films was dependent on the rate of coagulation. Transparent films prepared by the slow coagulation showed good drawability and had a maximum draw ratio of…
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry was used to deduce the three-dimensional structure of a complex silsesquioxane polymer. Four distinct levels of structure were observed in the mass spectrum. The overall shape of the peak distribution was typical of polymers formed by condens…
<div class="htmlview paragraph">Diesel particulate filter regeneration (through oxidation of the collected soot particles) is not currently possible under all engine operating conditions without additional external thermal energy. The exploitation of the autothermal properties of the reverse flow reactor has bee…
(1999). Invited article Liquid crystal templating of porous materials. Liquid Crystals: Vol. 26, No. 3, pp. 305-339.
High-quality, single-Frain samples of decagonal Al-Ni-Co quasicrystals with volumes of up to 0.8 cm3 and an approximate composition of Al72Ni11 Co17 have been grown from the ternary melt. The precise growth methods and conditions are discussed in detail. X-ray diffraction patterns of crushed single grains and of singl…
Samaria‐doped ceria solid oxide fuel cells (SOFC) single cells have demonstrated power densities > 250 mW / cm 2 at 700°C and stable performance for 15,000 h. Though encouraging, issues of stack performance and efficiency due to mixed conduction remain. Stacks operated on H 2 / 3 % H 2 O show approximately half the po…
We report the effect of light-induced sliding of the nematic director over an isotropic boundary surface in an azo-dye doped liquid-crystal cell. We show that illumination of the cell with polarized laser light induces transient dynamic sliding followed by permanent reorientation of the director. The two effects are i…
The photophysical properties of a tripartite supermolecule comprising zinc porphyrin and ruthenium(II) tris(2,2‘-bipyridyl) terminals separated by a trans Pt II bis-σ-acetylide fragment bearing tri- n -butylphosphine residues have been recorded in solution. Thus, excitation into the ruthenium(II) tris(2,2‘-bipyridyl)…