Materials Literature
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Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A review of the rigorous coupled-wave analysis (RCWA) as applied to the diffraction of electromagnetic waves by gratings is presented. The analysis is valid for any polarization, angle of incidence, and for conical diffraction. Cascaded and/or multiplexed gratings as well as material anisotropy and loss can be incorpo…
The influence of hardness and topology of substrate surface on the pretilt angle were investigated for a slightly tilted homeotropic alignment achieved by the rubbing technique. On a soft surface, the grooves are produced which align in the same direction as the rubbing direction while the liquid crystal molecules til…
This letter reports the lowest coefficient of friction measured for diamond sliding on diamond. When a natural diamond stylus with a spherical tip about 50 μm in diameter slides on a polished polycrystalline chemically vapor deposited diamond film in water at a speed of 0.05 mm/s under a load of 50 g, the coefficient…
Individual two-state and multistate fluctuators were found in the broadband noise in the sliding charge-density--wave (CDW) state of small samples of ${\mathrm{NbSe}}_{3}$. In the presence of dc currents, some multistate fluctuators violate detailed balance. Fluctuator properties show strong dependences on bias. As th…
Through measurements of the near-edge Ce L3 x-ray absorption structure we have investigated the influence of site volume on the cerium valence in Ce2Fe14B, Ce2Fe14BHx, and Ce2Fe17. The crystal structures of these compounds are isomorphic with those of technologically important permanent magnet materials. Confirming ot…
The interaction of C with Ni(100) has been studied by scanning tunneling microscopy (STM). The C atoms, imaged as \ensuremath{\approxeq}0.3 \AA{} deep depressions consistent with theoretical predictions, are at low C coverages located in the fourfold hollow sites, causing a small radial displacement of the surrounding…
Ferroelectric Pb0.9La0.1Zr0.2Ti0.8O3 thin film capacitors with a symmetrical La-Sr-Co-O top and bottom electrodes have been grown on [001] Si with yttria stabilized zirconia (YSZ) buffer layer. A layered perovskite ‘‘template’’ layer (200–300 Å thick), grown between the YSZ buffer layer and the bottom La-Sr-Co-O elect…
Lateral superstructures with honeycomb symmetry are shown to be classified, with a simple criterion, into semimetals with gapless k-linear dispersions, semiconductors, and metals. In some of the classes, the symmetry enforces flat bands to exist, which implies the occurrence of ferromagnetism when the electron correla…
A nonmechanical approach to the construction of complex three-dimensional interconnect arrays has been developed with the use of conducting polymer dendrites. Electrically independent connections between pairs of wires in an array were successfully grown through alternating-current electrochemical polymerization of po…
Light emission from molecular layers has been induced by inelastically tunneling electrons in a tunneling junction. The fast quenching of molecular emission on metal surfaces was suppressed by use of the "transparent conductor" indium-tin-oxide for the junction electrodes. The emission measurements have been made in s…
A model of the desorption and adsorption of a polymer layer at a planar surface indicates a transition from exponential kinetics at high temperatures to nonexponential kinetics (stretched exponential with index one-half) at lower temperatures where these processes are diffusion-limited. Measurements of polystyrene des…
Rare earth-doped glasses exhibit high initial photosensitivity but their response saturates at relatively modest values of (Delta) n (approximately 5 X 10<SUP>-7</SUP>), which greatly limits their usefulness for device applications. In the context of our model, saturation results from either exhaustion of photosensiti…
Abstract Polyesters were obtained from castor oil and dibasic acids for example, malonic, succinic, glutaric, adipic, suberic, and sebacic acids. These prepolyesters were characterized by infrared spectrometry, viscosimetric measurements, and molecular weight determinations (GPC). These prepolyesters were mixed with m…
Abstract The yield stress of polyacetal (POM) decreases monotonically with the incorporation of thermoplastic polyurethane (TPU) elastomer in POM/TPU blends as would be anticipated. However, the impact strength of the resultant POM/TPU blends increases initially up to 30% TPU and thereafter decreases with the addition…
Abstract Photodegradation of incombustible materials [polystyrene (PSt) and polypropyrene (PP) containing 2 wt% of decabromodiphenyl oxide (DBDE) or tetrabromobisphenol‐A (TBA) as a flame‐cut agent] were studied using Okazaki Large Spectrograph (OLS). Samples were irradiated in air at 23°C with monochromatic light of…
The electron emission spectrum resulting from thermal collisions of ${\mathrm{He}}^{\mathrm{*}}$(${2}^{3}$S) atoms with ${\mathrm{LaCoO}}_{3}$ was measured as well as the h\ensuremath{\nu}-dependent photoemission spectra. The ${\mathrm{He}}^{\mathrm{*}}$ spectrum shows that the lower-lying Co 3d derived (main) bands a…
Abstract The esterification of cellulose by a poly(carboxylic acid) proceeds in two steps: the formation of a 5‐membered cyclic anhydride intermediate by the dehydration of two carboxyls, and the reaction between cellulose and the anhydride intermediate to form an ester. Sodium hypophosphite is the most effective cata…
Abstract The present investigation was aimed at understanding the role of chemical compatibilizers like carboxy‐terminated nitrile rubber, amine‐terminated nitrile rubber, liquid carboxylated nitrile rubber, etc. in the reactive processing of a dynamically vulcanized 50 : 50 nylon/ HNBR blend. The interfacial paramete…
An exact formula for the field produced by the eddy currents induced by transverse movements of a longitudinal planar domain wall in a magnetic cylinder is obtained. The result has been extended to satisfy the situation of bistable iron-rich amorphous wires and compared with the dMav/dt pulse of such wires during magn…