Materials Literature
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Structural models needed in calculations of properties of substitutionally random ${\mathit{A}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathit{B}}_{\mathit{x}}$ alloys are usually constructed by randomly occupying each of the N sites of a periodic cell by A or B. We show that it is possible to design ``special quasira…
An empirical many-body potential-energy expression is developed for hydrocarbons that can model intramolecular chemical bonding in a variety of small hydrocarbon molecules as well as graphite and diamond lattices. The potential function is based on Tersoff's covalent-bonding formalism with additional terms that correc…
Absolute differential and angle-integrated cross sections for elastic electron scattering from mercury were measured at 100, 150 and 300 eV to check the internal consistency of two data sets obtained with a static gas target and an atomic beam. In addition, absolute differential and angle-integrated cross sections for…
A novel approach to producing p-type ZnSe epitaxial layers is reported which involves nitrogen atom beam doping during molecular beam epitaxial growth. Net acceptor concentrations as large as 3.4×1017 cm−3 have been measured in nitrogen atom beam doped ZnSe/GaAs heteroepitaxial layers which represents the highest acce…
Due to the incorporation of mechanical stresses during polymer/metal multilayer device fabrication, strong inter facial adhesion must be maintained in order to sustain mechanical integrity. Here we consider the adhesion of metal deposited onto polymer. In order to assure chemical bonding of the sort leading to strong…
High amplitude radial pulsations of a single bubble in several glycerine and water mixtures were observed in an acoustic stationary wave system at acoustic pressure amplitudes on the order of 150 kPa at 21-25 kHz. Sonoluminescence, a phenomenon generally attributed to the high temperatures generated during the collaps…
The phase boundary of the collapsed phase for a directed polymer on a square lattice in the presence of an attractive wall and monomer-monomer interactions is calculated exactly using transfer-matrix techniques. The position of the multicritical point is also identified.
Abstract The effect of prevulcanisation on the processing properties and network structure of a series of latex compounds containing conventional and efficient vulcanisation (E.V. systems) systems for the manufacture of latex thread was evaluated. Prevulcanisation was effected at 70°C and the extent of crosslinks form…
Abstract A series of poly( p ‐oxybenzoate‐co‐ p ‐phenylene isophthalate)s were prepared by melt polycondensation of p ‐acotoxybenzoic acid, p ‐phenylene diacetate, and isophthalic acid followed by solid‐state polymerization. The solid‐state polymerization not only increased the molecular weight, but also annealed the…
Transparent and conducting SnOx thin films were made by reactive rf magnetron sputtering of Sn in Ar+O2 onto unheated glass. Optical and electrical properties were reconciled with a quantitative model for wide band-gap semiconductors. The theory is based on heavy n doping by doubly ionized oxygen vacancies and ionized…
Photoelectron spectra of calaverite, AuTe 2 , show a Au 5d band extending from -3 to -8 eV below the Fermi energy. Photoemission peaks from Au 4f core levels are sharp, indicating that all Au atoms have the same valency. The binding energies of Au 4f electrons in AuTe 2 and metallic Au are approximately the same. Acco…
We have grown crystalline thin films of LaAlO3 using off-axis rf sputtering from a single stoichiometric target. The films grow epitaxially on SrTiO3 and LaAlO3 (100) substrates as well as on YBa2Cu3O7 thin films. We report on the growth conditions used to make these films, the properties of the films, and the propert…
Abstract Since 4‐vinylbenzyl N,N ‐diethyldithiocarbamate (VBDC) polymer easily cleaves at the C—S bond and generates benzyl radical, graft copolymerization of methyl methacrylate (MMA) or 4‐vinylpyridine (VPy) onto VBDC polymer is easily performed by UV irradiation. The structural analyses of the graft copolymers are…
Abstract Cellulose‐hydroxamic acid derivatives, which were reported as a novel cellulose derivative were prepared from dialdehyde celluloses obtained by periodate oxidation of cellulose, and certain properties of unusual cellulose derivative containing hydroxamic acid groups and of various metal complexes formed with…
Abstract Four kinds of annealed polyethylene (PE) films with varying densities were photo‐irradiated with a medium pressure mercury lamp. Photodegradation processes were followed by ultraviolet (UV) and Fourier transform infrared (FTIR) spectroscopic techniques and by gel and mechanical property measurements. Oxygenat…
Abstract A process has been developed for continuous photoinitiated graft copolymerization of acrylamide (AM) and acrylic acid (AA) onto the surface of high‐density polyethylene (HDPE) tape film, presoaked in a solution containing monomer and initiator under nitrogen atmosphere. As photoinitiator we have used benzophe…
Several experiments were performed in order to understand the creation and readout mechanisms of photostimulable (PS) centers in BaFBr:${\mathrm{Eu}}^{2+}$ single crystals. PS centers can be efficiently created starting from 6.7 eV, i.e., the minimal energy required to excite the first valence exciton. This exciton re…
Abstract Poly(aryl‐ether‐ether‐ketone) (PEEK) has been heated at 400°C in both nitrogen and air. The extent of thermal degradation has been monitored by a variety of techniques including: solution viscometry, UV‐visible spectroscopy, 13 C high‐resolution cross‐polarization/magic angle spinning nuclear magnetic resonan…
Abstract Structure of Bombyx mori silk fibroin membrane insolubilized with methanol, especially in the swollen state, is studied by means of spin‐label ESR, 13 C‐NMR, and FT‐IR (ATR method) spectroscopies. FT‐IR data indicate that the conformational transition from random coil to antiparallel β‐sheet occurs at the sur…
Sea urchin skeletal elements are composed of single crystals of calcite. Unlike their synthetic counterparts, these crystals do not have well-developed cleavage and are consequently much more resistant to fracture. This phenomenon is due in part to the presence of acidic glycoproteins occluded within the crystals. By…