Materials Literature
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Recently, Schweizer, Honnell, and Curro reported a self-consistent formulation of the polymer reference interaction site model (PRISM) theory for polymer melts. The purpose of this paper is to compare the predictions of this theory to Monte Carlo simulations of hard chains thereby allowing an independent test of the v…
We have characterized cDNA clones that encode a newly discovered collagenous polypeptide. A 4-kilobase (kb) cDNA clone was initially isolated by screening a human fibroblast cDNA library with a probe encoding the collagenous domain of the human alpha 3(VI) collagen. Subsequent screening of another fibroblast cDNA libr…
X-ray and neutron diffraction measurements were performed on glassy water prepared by rapid cooling of water droplets on a cryoplate. Structure factors and radial distribution functions were found to be nearly identical to those obtained from amorphous ice formed either by vapor deposition onto substrates cooled at 77…
The vibrational properties of Si-Ge systems are studied theoretically with ab initio techniques. Full dispersion relations for pure silicon and germanium crystals under several (homogeneous and epitaxial) strain conditions are obtained from interatomic force constants (IFC's). High-symmetry vibrations for a few short-…
We report visible light emission from diodes made from poly(3-octylthiophene). Use of a soluble derivative of polythiophene allows fabrication of the light emitting diodes by casting the polymer film from solution with no subsequent processing or heat treatment required. The devices emit dim red-orange light with rela…
Electronic structures and band offsets of Zinc-compound (001) strained superlattices are calculated by the first-principles pseudopotential method. It is shown that strained superlattices become quantum well systems of good quality for the states around the fundamental gap. With varying the strain surroundings, band o…
Shock- and release-wave measurements are reported for 6061-T6 aluminum [J. R. Asay and L. C. Chhabildas, in Shock Waves and High-Strain-Rate Phenomena in Metals, edited by M. A. Meyers and L. E. Murr (Plenum, New York, 1981), pp. 417–431], oxygen-free-electronic copper, and a Si-bronze alloy. Significant departure fro…
Plasmons in Si clusters were investigated by electron energy loss spectroscopy attached to high-resolution transmission electron microscopy, by which an individual cluster can be investigated with the electron probe of 2 nm size. It has been found that the plasmon energy increases in proportion to the inverse square o…
The effects of Ti substitution for Fe on octahedral sites in magnetite has been investigated through electrical resistivity measurements. In a manner analogous to zinc ferrites, the Verwey transition temperature is depressed with increasing Ti content. The Verwey transition is of first order in ${\mathrm{Fe}}_{3\mathr…
A diffusion equation describing phase separation during co-deposition of a binary alloy is derived, and solved in the limit of dominant surface diffusion. Linear stability analysis yields results similar to bulk spinodal decomposition, except that long, and possibly all, wavelength are stabilized. Decomposition into t…
We have carried out optical and transport measurements of the free carriers and optical measurements of states above the semiconducting energy gap in the layered crystal ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$. We find that cooling causes a substantial amount of spectral weight to condense from the above-gap states int…
Electric-field-gradient (EFG) calculations for ${\mathrm{TiO}}_{2}$ in the rutile structure using the standard full-potential linearized-augmented-plane-wave (LAPW) method have shown that the contribution of the Ti 3p semicore states is comparable to that of the valence electrons in contrast to other systems studied s…
Using chemical vapor deposition (CVD), we have prepared ${\mathrm{B}}_{\mathit{x}}$${\mathrm{C}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ solid solutions for 0x0.17, which have the graphite structure. By varying the relative proportions of benzene and boron trichloride in the CVD reactor, we are able to control the boron…
2H-nuclear magnetic resonance(NMR)-spin–lattice relaxation experiments have been performed for studying the crossover from viscous (α process) to secondary (β processes) dynamics in the van der Waals liquid orthoterphenyl and the H-bridged network glycerol. The essential and general features, observed in both systems,…
We report the synthesis and evaluation of (EDTA-2-aminoethyl) 2-pyridyl disulfide. By using this easily prepared cysteine-specific hydrophilic reagent, an ethylenediaminetriacetic acid-Fe3+ complex (EDTA-Fe) was covalently attached to a single genetically engineered cysteine residue in staphylococcal nuclease. Upon ad…
We report studies of the electrochemical intercalation of lithium in ${\mathrm{WO}}_{3}$ powder and in polycrystalline evaporated ${\mathrm{WO}}_{3}$ films. Electrochemical cells with beryllium x-ray windows were used to study the structure changes in the ${\mathrm{WO}}_{3}$ host in situ. Rietveld profile refinement w…
We describe an efficient implementation of the quadratic response function for a multiconfiguration self-consistent field reference wave function. The quadratic response function determines the hyperpolarizability and its residues determine the two-photon transition matrix elements and the transition matrix elements b…
Two models to reproduce experimental inelastic-electron-scattering cross sections determined from reflection-electron-energy-loss spectroscopy (REELS) are considered. The models take into account the momentum transfer in the inelastic processes. Inputs for the models are the dielectric function and the inelastic elect…
Ion beam assisted evaporation was used to deposit cubic and hexagonal boron nitride thin films. Boron was evaporated and bombardment was by argon and nitrogen ions. The effect of preparation conditions on the resulting phase was studied, and the relationship between the phase and the energy and momentum transferred in…
Two possible joints between different types of carbon tubules are discussed. Both joints introduce a single pentagon-heptagon pair into the perfect hexagon bonding pattern of the two tubules. These two types of joints can be used to form composite tubules in which every carbon atom is threefold coordinated. The first…