Materials Literature
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The superconductivity that occurs below the charge ordering temperature in a quasi-two-dimensional (quasi-2D) organic conductor, the α-(ET) 2 I 3 salt, has been examined by applying the mean field theory and the random phase approximation to the extended Hubbard model with four sites in the unit cell and anisotropic n…
This paper describes the mechanism of leader discharge inception in SF6 gas with and without spacers exposed to fast oscillating impulse. A photomultiplier and a current probe are employed for the investigation of discharge development. The results show that the back discharge plays an important role in the initiation…
Environmental transmission electron microscopy (ETEM) is opening an important window for in situ studies of interaction of water with oxides. Studies of MgO smoke nanocrystals under partial pressures of water ranging from 10 mTorr to 10 Torr found their {100} neutral surfaces to be extremely resistant to dissociative…
Visible quantum cutting through downconversion is observed for the Gd3+–Eu3+ couple in KLiGdF5:Eu3+ (KLGF:Eu3+). In this Gd3+-based fluoride, visible quantum cutting, the emission of two photons of visible light per absorbed photon, occurs upon vacuum ultraviolet excitation of Gd3+ at the GJ6 level via two-step energy…
We describe the synthesis and characterization of a series of model nematic liquid crystals with transverse dipole moments used to study the flexoelectric effect in guest−host mixtures with commercial liquid crystal host. The flexoelectric coefficicent of the mixtures, containing only 10% by weight of the dopant, are…
Automatic qualitative analysis for peak identification is a standard feature of virtually all modern computer-aided analysis software for energy dispersive X-ray spectrometry with electron excitation. Testing of recently installed systems from four different manufacturers has revealed the occasional occurrence of misi…
Systematic studies of resistivity, thermoelectric power, and thermal conductivity have been performed on polycrystalline bilayered manganites ${\mathrm{LaSr}}_{2}{\mathrm{Mn}}_{2\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{O}}_{7}\phantom{\rule{0.2em}{0ex}}(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.2)$. As $x\ensur…
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…