Materials Literature
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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…
The photoluminescence (PL) response of porous silicon is usually in the form of a single broad peak. Recently, however, PL response with two peaks has been reported. Here we report the observation of multiple peaks in the PL spectrum of porous silicon. A simple modeling of the line shape indicates that four peaks exis…
Abstract A new method to investigate the mechanical degradation of polymers in solution is described that uses size exclusion chromatograms of the initial polymer and of the degraded sample. The incipient parts of these chromatograms are analyzed to obtain kinetic data about degradation at the level of infinitesimal f…
Abstract The skin–core morphology of injection‐molded polypropylene bars has been investigated employing X‐ray small‐and wide‐angle scattering. The small‐angle scattering has been evaluated by means of interface distribution functions. It is found that skin and core exhibit different morphologies. In the skin, the cry…
Abstract Poly(ethylene terephthalate) (PET), taken from postconsumer soft‐drink bottles, was subjected to solid‐state polycondensation, as received or after dissolution in various solvents and precipitation in methanol. The solvents used were: benzyl alcohol, phenol/tetrachloroethane 60/40, or o ‐chlorophenol. The eff…
We combine low energy and low dose ion implantation with an electrochemical etch to fabricate thin diamond layers suitable for seeding homoepitaxial or polycrystalline chemical vapor deposited (CVD) diamond growth. Implantation of a carbon ion dose of 1×1016 cm−2 at 175 keV creates subsurface damage in a bulk crystal…
We demonstrate a successful growth of GaP1−xNx alloys on GaP by metalorganic vapor phase epitaxy (MOVPE). This alloy system is predicted to have an extremely large miscibility gap, ranging from x=0.0000003 to 0.9999997 at 700 °C. However, metastable alloys (x≤0.04) have been obtained at the growth temperature of 630–7…
Transport properties and optical conductivity are calculated for the crystalline approximant AlMn alloy. The number of electrons at the Fermi energy is very small and, based on the band structure, the anomalously small dc conductivity and temperature dependent thermoelectric power are explained. A model calculation fo…
The surface chemical modification of poly(tetrafluoroethylene) and poly(tetrafluoroethylene- co-hexafluoropropylene) films was carried out in hydrazine gas photolyzed with ArF excimer laser irradiation. The contact angle of the modified surfaces with water changed from 130° to 30° due to the reaction with hydrazine. N…