Materials Literature
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Solid deuterium-tritium (D-T) fuel layers inside copper-doped beryllium shells are robust inertial confinement fusion fuel pellets. This paper describes the first characterization of such layers using phase-contrast x-ray imaging. Good agreement is found between calculation and experimental contrast at the layer inter…
The difficulty of obtaining significant long-term patency and good wall mechanical strength in vivo has been a significant obstacle in achieving small-diameter vascular prostheses. The aim of the present study was to develop a prosthetic graft that could perform as a small-diameter vascular conduit. Tubular structures…
Abstract The new convenient method for the synthesis of high molecular weight aromatic poly(1,3,4‐oxadiazole)s (PODs) has been proposed. These polymers were prepared by “one‐pot” procedure from dicarboxylic acid and hydrazine's salt (sulfate, phosphate) or dicarboxylic acid dihydrazides. The mixture of ionic liquid an…
Double-filled skutterudite compounds CemLanFeCo3Sb12 with (m+n)=0.2–0.4 were synthesized by spark plasma sintering using powders of Co, Sb, Fe, and rare-earth Ce and La as starting materials, and the thermoelectric properties were studied in detail. The dominant phases of all the samples are the skutterudite with smal…
The electrical properties of polycrystalline Pb2Sb3DyTi5O18 were investigated by complex impedance spectroscopy. The dielectric relaxation was found to be of polydispersive non-Debye type, and relaxation frequency shifts to higher frequencies with increasing temperature. Evidence of temperature dependent electrical re…
The aim of this work is to report on the luminescence properties of SrY2O4 activated by Eu3+ ion. Powder samples were prepared by solid-state reaction. X-ray diffraction powder data, photoluminescence, and high-resolution spectroscopy were carried out. Results revealed that the Eu3+ ions occupied three nonequivalent s…
A water-soluble hexa-peri-hexabenzocoronene was prepared and shown to undergo ordered columnar self-assembly either in water solution or bulk and therefore served as template for the fabrication of porous silica with aligned nanochannels.
We have investigated the influence of polymer structure on the erosion profiles of multilayered polyelectrolyte assemblies fabricated from sodium poly(styrene sulfonate) (SPS) and three different hydrolytically degradable polyamines. We synthesized three structurally related poly(beta-amino ester)s (polymers 1-3) havi…
A layer-by-layer (LBL) assembled electrochromic (EC) film was investigated by using poly(aniline- N -butylsulfonate)s (PANBS) as an electrochromic anionic polymer, and acid-doped polyaniline (PAN) and vinylbenzyldimethyl- n -octadecylammonium salts (VBOD) as a polycation. The layer sequence of the EC films was varied…
We have recently reported on the preparation of biodegradable elastomers through photo-cross-linking acrylated star-poly(epsilon-caprolactone-co-D,L-lactide). In this paper we assess the change in their physical properties during in vivo degradation in rats after subcutaneous implantation over a 12 week period. These…
The growth and structure of small ${\mathrm{Au}}_{n}$ particles $(n=1\text{--}4)$ on a rutile $\mathrm{Ti}{\mathrm{O}}_{2}(110)$ surface have been examined using gradient corrected density functional theory slab calculations. We present potential energy maps for single Au atoms on the stoichiometric and reduced surfac…
The reversible protonation of carbon single-walled nanotubes (SWNTs) in sulfuric acid and Nafion was investigated using solid-state nuclear magnetic resonance (NMR) and Raman spectroscopies. Magic-angle spinning (MAS) was used to obtain high-resolution 13C and 1H-13C cross polarization (CP) NMR spectra. The 13C NMR ch…
Pressureless sintering of ultrafine zirconium diboride ZrB2 powder produced by a self-propagating high temperature synthesis (SHS) route was investigated at 1973–2223 K with continuous flow of pure argon gas (20 mL min−1). Ultrafine ZrB2 powder produced by the addition of an inert SHS diluent showed excellent sinterab…
This study focuses on the experimental investigation of the time-dependent effects of a commercial soft lead zirconate titanate material at room temperature. Samples in initially unpoled states were subjected to a cyclic stepwise electric field which was kept constant at different levels for 300 s. Due to ferroelectri…
The synthesis and near-infrared electrochromic properties of pentacenediquinone-containing monomers and polymers are reported. The electroactive pentacenediquinone units were incorporated into poly(aryl ether)s in varying degrees by copolymerization. The polymers possessed good thermal stabilities and high glass trans…
The thermal stability and the atomic ordering of single-crystal Heusler alloy Co2FeSi layers grown by molecular beam epitaxy on GaAs(001) have been studied. We found that the Co2FeSi layers have a long-range atomic order and crystallize in a partly disordered L21 structure in the low growth temperature (TG) regime. Th…
The conductivity spectra of polycrystalline ${\mathrm{Na}}_{2}\mathrm{S}{\mathrm{O}}_{4}$ have been investigated in the frequency range $42\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}--1\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$ at different temperatures below and above the $V\text{\ensuremath{-}}I$ phase transition temperatu…
We report several strategies for varying the diameter, the center-to-center spacing, and the areal density of block copolymer micelles, or inorganic nanoclusters synthesized in the cores of the micelles, on planar substrates. The amphiphilic block copolymer, poly(styrene- b -acrylic acid) (PS/PAA), forms micelles in t…
We investigated the third-order nonlinear optical properties of several donor-substituted cyanoethynylethene molecules in the zero-frequency limit. We observed nonlinearities that are extraordinarily large relative to the small molecular mass of these molecules and that are within a factor of 50 from the fundamental l…
Aluminum substituted barium hexaferrites were prepared by the self-propagating combustion method and subsequent calcination at 850 °C. The crystalline structure, complex permittivity, complex permeability, and hyperfine parameters of BaFe12−xAlxO19 (x varies from 1.5 to 2.3 in steps of 0.2) were measured with x-ray di…