Materials Literature
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A series of nondegenerate pump-probe measurements were carried out on a DNA-wrapped single-walled carbon nanotube (SWNT) sample that is enriched with the (6,5) species. The pump pulse excites SWNTs at $\ensuremath{\sim}1.567\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, which corresponds to an energy of two $D$-band phonons…
In a poled ferroelectric ceramic, the probability of crystallographic poles oriented in any given specimen direction is the multiple of both the initial crystallographic texture and the domain switching fraction. In this paper, the non-180° domain switching fraction is shown to be dependent on the initial crystallogra…
Pressureless sintering of ultrafine zirconium diboride ZrB2 produced by self-propagating high temperature synthesis (SHS) was carried out over a temperature range of 1573 to 1873 K using a nickel additive. The additive improved densification behaviour and a maximum densification of 88% was achieved at 1873 K. The XRD…
Aiming at producing a synthetic collagen-mimetic material that is stiffer than collagen but that like collagen allows both cell encapsulation and cell growth on the surface, a positively charged poloxamine hydrogel was prepared by methylating the tertiary amine groups of a four-arm poly(ethylene oxide)-poly(propylene…
Abstract The recycling of butyl rubber‐based tire‐curing bladder was carried out by means of a grooved barrel ultrasonic extruder. Die pressure and ultrasonic power consumption were measured as a function of flow rate and ultrasonic amplitude. Gel fraction and crosslink density of the ultrasonically devulcanized rubbe…
A kinetic Monte Carlo simulation of the electromigration-induced void migration behavior of three-dimensional nanovoids at the interface between a metal conductor and its dielectric overlayer is presented. Major stages of the recently observed failure mode of surface void migration and accumulation at the cathode via…
Electron-beam-deposited Ti∕Au ohmic contacts on undoped (n∼1017cm−3) bulk ZnO substrates exhibited as-deposited specific contact resistivity of 3×10−4Ωcm2, regardless of the polarity (Zn face or O face) of the ZnO substrate. The annealing environment (air or N2) also had no significant effect on contact properties. Th…
The purpose of this study is to analyze the localization of palladium nanoparticles within their silica support, in two heterogeneous catalysts synthesized by the sol-gel process, with different metal loadings. Electron tomography demonstrates that the palladium particles are localized deep inside the silica skeleton.…
A sample of MoOx/SiO2, in which all of the Mo cations are present as isolated mono-oxo molybdate moieties, was prepared and investigated to understand the redox chemistry of such molybdate species and their ability to exchange oxygen with O2 and H2O. Raman spectroscopy was used to monitor the exchange of 18O for 16O i…
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…