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。
High‐pressure sintering of nanocrystalline γ‐A1 2 O 3 has been studied over a temperature range of 923‐1323 K and at a pressure of 1 GPa. The γ‐Al 2 O 3 to α‐Al 2 O 3 transformation temperature changed from 1473 K without pressure to ∼1023 K at 1 GPa. Full density was obtained at 1273 and 1323 K in 10 min. The microha…
Barium titanate (BaTiO 3 ) powders were prepared by a polymerized complex method based on the Pechini‐type reaction route, wherein a mixed solution of citric acid (CA), ethylene glycol (EG), and barium and titanium ions, with a molar ratio of CA:EG:Ba:Ti = 10:40:1:1, was polymerized to form a transparent resin, which…
Abstract Aqueous organic contaminants, such as gasoline‐derived aromatics, are effectively sorbed by organo‐clays. Organo‐clays were prepared from montmorillonite (SWy‐1, SAz‐1) and vermiculite (VSC) clay minerals by exchanging quaternary, alkylammonium cations for the inorganic exchange cations; thus, a variety of cl…
The biodiversity and occurrence in nature of bioplastic-degrading microorganisms are exemplified by the identification of 695 strains, isolated from different environments, such as soils, composts, natural waters, and sludge, that are able to degrade the bacterial polyester poly(3-hydroxybutyrate)in vitro. These micro…
We present results of an ab initio molecular-dynamics study of glassy ${\mathrm{GeSe}}_{2}$ using a 216 atom model. The network topology of our model is analyzed through partial pair correlations, angle distributions, partial static structure factors, and ring structures. The total static structure factor and first sh…
The procedure for three-dimensional additive lithography with electron-beam induced deposition is applied in a scanning electron microscope equipped with an image processor beam control system for lithography. Employing organometallic materials, which contain gold or platinum, quantum dots, resistors, and field emitte…
Pentaerythritol tetranitrate reductase, which reductively liberates nitrite from nitrate esters, is related to old yellow enzyme. Pentaerythritol tetranitrate reductase follows a ping-pong mechanism with competitive substrate inhibition by NADPH, is strongly inhibited by steroids, and is capable of reducing the unsatu…
This book covers the most important issues of plasma - wall interactions in nuclear fusion devices. Several authors, all actively working in that particular field, have written articles on surface phenomena (erosion mechanisms, particle recyling, wall coatings and ablation) and bulk material properties (thermal stabil…
A semi-empirical model has been developed for additive diffusion in polymers. The model estimates apparent diffusion coefficients of an additive migrating through polyolefin polymers into a fatty food simulant for a range of temperatures between the glass transition and melting temperatures of the polymer. This diffus…
Highly textured chemically vapor‐deposited silicon carbide (CVD‐SiC) thick films were oxidized and compared to single‐crystal SiC and single‐crystal silicon. The oxidation rates of the (111) face of the cubic CVD‐SiC were the same as those of the (0001) face of the single‐crystal SiC. Similarly, the opposite faces of…
The hydration of omega-gliadins and party deamidated and esterified omega-gliadins has been studied by Fourier transform IR spectroscopy. The secondary structure of the fully hydrated proteins was a mixture of beta-turns and extended chains, with a small amount of intermolecular beta-sheets. The absorption of the glut…
Energy dispersive spectrometry line scan and ac impedance spectroscopy were used in this study to investigate the chemical reactions between two cathode materials, La 0.84 Sr 0.16 MnO 3 (LSM), La 0.5 Sr 0.5 CoO 3 − δ (LSC), and the electrolyte La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 (LSGM). Significant interdiffusions of C…
Resistivity measurements on a La0.67Ca0.33MnO3 film are reported for a series of argon anneals at successively higher temperatures. Tc, the ferromagnetic ordering temperature, increases uniformly with increasing annealing temperature and annealing time. Hence, Tc can be tuned by appropriate annealing. In order to full…
Achromatic interferometric lithography is the preferred approach for producing large-area, spatially coherent 100 nm period gratings and grids. We report on improvements to processes which have enabled exposure areas of ≊10 cm2. In addition, we report on the fabrication of 100 nm period free-standing gold gratings.
Abstract The extended dithienylethene compounds 1–3 have been synthesized. They undergo photochromic and electrochemical changes by photoinduced interconversion between open and closed forms of type A and B . In addition, both forms of the N ‐methylated derivatives 1b and 2b have absorption bands in which excitation r…
We analyze the director field around a spherical colloid particle with radial (homeotropic) anchoring on its surface. Depending on the relative strength of anchoring W, controlled by the parameter WR/K with K the Frank constant and R the particle radius, the director distribution may possess a singular ring of a -1/2…
BACKGROUND: We have previously reported the successful creation of tissue-engineered valve leaflets and the implantation of these autologous tissue leaflets in the pulmonary valve position. This study was designed to trace cultured cells that were seeded onto a biodegradable polymer with the use of a 1,1'-dioctadecyl-…
A series of perovskite‐type manganites, (Ln = lanthanoids or Y), were examined for their electrode‐catalytic activities to reduce oxygen in alkaline solution. Polarization experiments using gas diffusion‐type electrodes revealed that the catalytic activity differed significantly with a change in Ln, being in the order…
The effects of humidity and sub-parts-per-million by volume contaminant levels on the photooxidation of formaldehyde and toluene are presented. UV radiation from a black-light lamp and a titania-coated glass-plate reactor were used to develop kinetic oxidation rates. The data indicated that competitive adsorption betw…
X-ray diffraction is sensitive to thin films of atomic dimensions to thicknesses of many tens of microns, by virtue of the x-ray wavelengths employed and the very high diffraction-space resolutions attainable. X-ray methods are generally non-destructive, in that sample preparation is not required, and they can provide…