Materials Literature
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Graft copolymerization of 2-(dimethylamino)ethyl methacrylate onto potato starch was carried out in an aqueous medium using a potassium permanganate/sulfuric acid initiation system. The grafting percentage and grafting efficiency were determined as functions of the concentrations of potassium permanganate, sulfuric ac…
The well-known transcistrans photoisomerization of azobenzenes produces at least three different kinds of motion in the polymer materials to which the azobenzenes are bound. The first is a photoinduced motion of the azobenzene groups only, and they can align in a selected position with respect to the light polarizat…
Time-dependent dielectric breakdown (TDDB) between Cu interconnects is investigated. TDDB lifetime strongly depends on the surface condition of the Cu interconnect and surrounding pTEOS. A NH/sub 3/-plasma treatment prior to cap-pSiN deposition on Cu interconnect improved the dielectric breakdown lifetime (T/sub BD/)…
Abstract Si(Li) lineshapes are generated using a model that incorporates Monte Carlo simulation of the interactions of the incident photon, a very simple approach to energy deposition by the primary (Auger and photo‐) electrons, and an analytical approximation for diffusion of thermalized secondary electrons. The aim…
New derivatives of triphenylene, perylene, and pyrene are described, some of which form columnar mesophases. The absorption spectra are investigated both experimentally and theoretically. The spectra calculated using the density functional tight binding (DFTB) theory are in good agreement with experimental results. Th…
This report describes a bifunctional protein able to associate dissimilar materials. One domain of the protein adheres to metallic gold. The other domain contains a substrate for enzymatic biotin transfer. The protein is able to assemble micron-diameter gold and streptavidin-coated polystyrene spheres in a programmed…
Abstract New flame‐retardant epoxy resin compounds containing novolac derivatives with specific aromatic compounds have been developed. After crosslinking reactions between epoxy resin and hardener, the epoxy resin compounds formed highly flame‐retardant network structures that were obtained by including biphenylene a…
Diodes formed by electrodeposition of the low-band gap polymer poly(4-dicyano methylene-4H-cyclopenta[2,1-b:3,4-b′]dithiophene), onto glass slides coated with indium tin oxide (ITO) and furnished with evaporated aluminum counterelectrodes exhibit a reversible bistability in their current–voltage (I–V) characteristics.…
We argue that elastic interactions between ions in different valence states can play an essential role in the stabilization of stripes (or 2D "sheets" ) in doped oxides. These interactions are in general long range and an iso tro pic (attractive in certain directions and repulsive in others). This can naturally give r…
Zinc oxide (ZnO) of high quality was homoepitaxially grown by metal-organic vapor phase epitaxy (MOVPE) on molecular beam epitaxy (MBE)-grown ZnO layers after the pretreatment of the underlying MBE-ZnO at 1000°C in N 2 which resulted in an atomically flat surface. In photoluminescence at 15 K, the 3 meV line width of…
We propose materials design to fabricate the transparent and half-metallic ferromagnets in V or Cr-doped ZnS, ZnSe and ZnTe based upon ab initio electronic structure calculation with the local-spin-density-functional approximation. The electronic structure and the magnetic properties of 3d-transition-metal-atom-doped…
The preparation of hexagonal GaN:Mn and GaN:Fe epilayers has been studied by RF-plasma-assisted molecular beam epitaxy. GaN:Fe epilayers exhibit superparamagnetic behavior, presumably due to ferromagnetic inclusions. GaN:Mn epilayers can be expressed in the form of Ga 1- x Mn x N with x up to 0.02, indicating the succ…
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Initial recrystallization texture is influenced by the bulk content of sulfur and by the final reduction. At a given bulk content of sulfur, a lower final reduction is favorable for obtaining the initial {011}Goss texture. Under a fixed final reduction, a lower bulk content of sulfur is good for this purpose. As the i…
An innovative image processing methodology is proposed to draw the magnetization curves of electrical steels. Our methodology enables to draw the continuous magnetization curve from a series of the distinct scanning electron microscope (SEM) images of magnetic domains. Our image processing methodology has two distingu…
An accelerated hydrothermic ageing (according to N.F.T. 54043 method) was performed on samples of rigid poly(vinyl chloride). The test consisted of sample immersion in boiling water at 100°C for different exposure periods up to 480 h. The samples were removed from the boiling water every two hours for mechanical and d…
A 2-furanyl oxy derivative of a novolac epoxy resin (FNE) was prepared using furfuryl alcohol (from agricultural waste) and characterised. The Diels-Alder polymerisation of FNE with various bismaleimides was carried out in solution as well as in bulk. The resultant novolac epoxy resin based polyimides were characteris…
Abstract The activities of a MnO/γ‐Al 2 O 3 catalyst for the selective reduction of methyl benzoate to benzaldehyde have been studied in a continuous flow reactor. Characterization of the catalyst has been conducted by XRD, XPS, NH 3 ‐TPD and TPD‐IR. XRD and XPS results revealed that the steady state catalyst is mainl…
SrO‐doped CeO 2 electrolyte has been evaluated in single‐cell configuration under solid‐oxide fuel cell operating conditions. Because of oxygen loss from the crystal lattice, the material experiences a macroscopic expansion of several percent at 1000°C. On extended cell operation, strontium precipitates‐out at/near th…
This work reports survey and core level x-ray photoemission spectra obtained from the surface of a barium nitrate powder. The high purity (99.999%) barium nitrate specimen was commercially obtained from Alfa/AESARS. The XPS spectra were measured with a Kratos Axis 165 instrument using monochromatic Al Kα radiation. Th…