Materials Literature
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In this article, we report the fabrication of highly ordered TiO 2 nanowire arrays by anodic oxidative hydrolysis of TiCl 3 within a hexagonal close-packed nanochannel alumina (NCA). The single-crystalline anatase TiO 2 nanowires with diameters about 15 nm and lengths about 6 μm are obtained after annealing at 500 °C.…
Synchrotron-based high-resolution photoemission, conventional X-ray (Mg Kα) photoemission (XPS), X-ray absorption near-edge spectroscopy (XANES), and first-principles density-functional calculations have been used to study the electronic properties of a Ce 0.8 Zr 0.2 O 2 mixed-metal oxide. The results of density-funct…
X-ray diffraction study of multiwalled carbon nanotube (MWNT) grown by arc discharge in hydrogen atmosphere is presented. It is found that the thermal-expansion coefficient along the radial direction of MWNT is widely distributed in a range from $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5} {\mathrm{K}}…
In our own work, we have recognized the benefits of Scheme 15 for the detection of mono-and bicyclic aromatic hydrocarbons. We have modified the rim of P-CD with an azamacrocycle, which ligates Eu3+ ion as the reporter site [405]. Tethered at only one nitrogen, the azacrown of 82 is able to swing away from the bottom…
The structures of the hexagonal Frank--Kasper phases F and K, which have been described in terms of the aggregation of clusters, are interpreted as modulated crystal structures. They are basically composed of two close-packed layers with ordered atomic vacancies rotated by 90 degrees to each other about their normal.
Following the explosion of Delta 241 (IIR-1) on January 17th, 1997, the failure investigation board concluded that the Graphite Epoxy Motorcases (GEM's) should be inspected for damage just prior to launch. Subsequent investigations and feedback from industry led to an Aerospace Corporation proposal to instrument the e…
Abstract Cadmium sulfide thin layers in polycrystalline solar cells are produced by chemical bath deposition (CBD). This process produces wastes containing ammonia and cadmium. These two chemicals must be recovered, and if possible recycled, from an environmental and economic point of view. A process has been implemen…
The crystal structure of a layered compound Sc(2)B(1.1)C(3.2), scandium boride carbide (M(r) = 140.43), has been re-refined as a commensurate composite crystal using 1795 single-crystal X-ray diffraction intensities with I > 2 sigma(I) collected by Shi, Leithe-Jasper, Bourgeois, Bando & Tanaka [(1999), J. Solid State…
We study the submonolayer diffusion of hard disks and rodlike molecules on smooth surfaces through numerical simulations and theoretical arguments. We concentrate on the behavior of the various diffusion coefficients as a function of the two-dimensional (2D) number density rho in the case where there are no explicit s…
Abstract A series of binary oxide‐supported ruthenium catalysts with zinc oxide as a component of the support was prepared. Zinc oxide was a major component of the support, the other component was lanthanum oxide, zirconium oxide, chromium oxide, barium oxide, gallium oxide, strontium oxide, calcium oxide or magnesium…
We present an optical study of the influence of both the flexoelectric effect and surface polarization on a hybrid-aligned nematic cell using the half-leaky guided mode technique. Tilt angle profiles, obtained from fits of experimental data (reflectivity curves) taken under applied voltages, are compared with the ones…
We have analyzed the experimental evidence of charge and orbital ordering in La0.5Sr1.5MnO4 using first principles band structure calculations. Our results suggest the presence of two types of Mn sites in the system. One of the Mn sites behaves as an Mn3+ ion, favoring a Jahn-Teller distortion of the surrounding oxyge…
Using an efficient numerical scheme that exploits spatial symmetries and spin parity, we have obtained the exact low-lying eigenstates of exchange Hamiltonians for the high-nuclearity spin clusters, ${\mathrm{Mn}}_{12},$ ${\mathrm{Fe}}_{8},$ and ${\mathrm{V}}_{15}.$ The largest calculation involves the ${\mathrm{Mn}}_…
The US Army Corps of Engineers CBR method (Method S77-1) for the design of flexible aircraft pavements was calibrated against full-scale trafficking tests on unbound pavements conducted 30 years ago. The method used single layer analysis so had no direct mechanism for crediting bound layers for their superior load spr…
Twelve samples of plastic materials employed in the industrial extraction of citrus essential oils were analyzed for the presence of phosphorated plasticizers, chloroparaffins, and phthalate esters. The samples tested were found to release these contaminants into the essential oils during the production process. Conta…
The effect of the large negative magnetoresistance in layered ferromagnetic metal ${\mathrm{GdI}}_{2}$ has been explained on the basis of the $s\ensuremath{-}f$ exchange model. Assuming the Ornstein-Zernike form of the spin-spin correlation function for the two-dimensional case, we calculate the resistivity in the vic…
Abstract A novel technique (pan‐milling mixing) was developed to control the morphology and thus enhance the mechanical properties of polypropylene/polyamide 6 (PP/PA6) systems. Through pan‐milling at ambient temperature, PP/PA6 pellets of particle size 2–4 mm can be effectively pulverized to well‐mixed micrometre fin…
Light-scattering spectra of two glasses, ${\mathrm{Ca}}_{0.4}{\mathrm{K}}_{0.6}({\mathrm{NO}}_{3}{)}_{1.4}$ and silica are measured in the frequency range $1--10000 \mathrm{GHz},$ covering temperatures from 19 K to 310 K. The low-frequency wing of the fast-relaxation spectrum is found to show a power-law behavior with…
gamma-Ray irradiation of chitosan flakes and introduction of hydrophobic chains onto hydroxyl groups are discussed. At 25 kGy, chain degradation without cross-linking reduces the molecular weight to one-fourth; however, structural characterization by FT-IR, 1H NMR, and 13C CP/MAS NMR indicates that the saccharide unit…
The selective catalytic reduction (SCR) of NO to N 2 by NH 3 over TiO 2, ZrO 2, and Al 2 O 3 was studied at 90 °C using a feed stream that was simulated to represent the effluent from a coal combustion boiler. The effects of SO 2 on the reduction of NO were studied. It is interesting that the SCR reaction was interrup…