Materials Literature
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Tailoring glass compositions can raise the viscosity of SiREAl oxynitride glasses. In the present study, viscosity data are obtained by determining the compressive creep response of bulk glasses in air. The findings reveal that increasing both the nitrogen‐to‐oxygen and the yttrium‐to‐aluminum ratios of the glasses sh…
Two‐ and three‐dimensional SiC r /SiC composites have been prepared starting from Tyranno SA(tm) fiber preforms. Preform densification has been performed by a modified preceramic polymer impregnation and pyrolysis (PIP) process consisting of filling the preform large interbundle voids with SiC powder before the PIP pr…
Two compositions of the Y 2 O 3 –MgO (YM) and Yb 2 O 3 –MgO (YbM) systems were chosen to study the effect of the sintering additive composition on the processing and thermal conductivity of sintered reaction‐bonded silicon nitride (SRBSN). The nitridation, postdensification, microstructural evolution, and thermal cond…
Raman spectroscopy has been applied to the study of basic Cu sulfates including antlerite, brochiantite, posnjakite, langite, and wroewolfeite and selected complex Cu sulfate minerals. Published X-ray diffraction data were used to estimate possible hydrogen bond distances for the basic Cu sulfate minerals. A Libowitzk…
Beside quasi-stationary plasma operation, short transient thermal pulses with deposited energy densities on the order of several tens of MJ/m2 are a serious concern for next-step devices, in particular, for tokamak devices such as ITER. The most serious of these transient events are plasma disruptions. Here, a conside…
Abstract A new production method for polypropylene‐clay nanocomposites has been successfully developed. This method did not require the pretreatment of the clay mineral with an organo‐cation. In this method we focused our attention on the nature of the clay mineral, which was exfoliated in water. Water was injected in…
Abstract A brief overview is given of the literature of the use of solvothermal techniques − chemistry in superheated solvents − towards paramagnetic cluster synthesis. Although these techniques have been used extensively to prepare infinite lattice magnetic materials, there is much less work on preparing discrete mol…
Many therapeutic agents have intracellular compartments as their site of action. Targeted delivery of these agents to their specific intracellular targets could result in enhanced therapeutic efficacy and reduced toxicity. Various carriers have been shown useful in targeted delivery of different classes of therapeutic…
Space charge formation and its increase with field under DC conditions is not a mystical phenomenon. The increase in space charge with applied field is an obvious and inevitable result of the interaction of field-dependent current density with spatially inhomogeneous resistivity. For common polymeric dielectrics, the…
Binding energies and preferred adsorption sites of O, OH, and H 2 O to bimetallic clusters PtX, Pt 2 X, and PtX 2 (X = Pt, Co, Cr, Ni) are determined using density functional theory. The second metal element in the alloy has stronger affinity for OH than the Pt sites, and it is able to adsorb up to two OH radicals per…
Glasses made from the magnesium silicate minerals enstatite (MgSiO 3 ) and forsterite (Mg 2 SiO 4 ) and three intermediate compositions can be considered as analogues of quenched melts from the Earth and Lunar mantle. Combined neutron and X-ray diffraction data show an abrupt change in glass structure in the narrow co…
Hydrogels of poly(2-hydroxyethyl methacrylate) (PHEMA) with well-defined polyelectrolyte brushes of poly(sodium 4-styrenesulfonate) (PNaSS) of various molecular weights were synthesized, keeping the distance between the polymer brushes constant at ca. 20 nm. The effect of polyelectrolyte brush length on the sliding fr…
In this experiment, we use a 44.4 dtex/4f spandex filament as the core and cotton fibers as the sheath to spin 19.7 tex elastic core-spun yarn. In order to improve yarn performance, we examine the yams cross-sectional structure and investigate the effect of draw ratio and feed-in angle of the spandex on the yarns' str…
Metallophthalocyanine complexes and related compounds play an important role in many advanced applications and modern technologies mostly by virtue of their characteristic optical absorption and high chemical stability. As a class of materials made well-known by their vivid and fast colors, it is expected that metallo…
I will discuss unique electronic and structural mechanisms of Ovonic optical phase-change devices making possible orders of magnitude increase of density of memory and introducing multiple information functions in a single nanostructure spot.
Fracture toughness and fracture strength data are presented for the first time for monoclinic zirconia. An undoped nanocrystalline zirconia powder was sintered at 1100°C and yielded a theoretical density of more than 90% with a grain size of about 150 nm. The surface crack in flexure (SCF) technique was deemed most su…
The radiation force-per-length on an infinitely long circular cylinder in an acoustic plane standing wave is expressed in terms of partial-wave scattering coefficients for the corresponding traveling wave scattering problem. This information allows a dimensionless radiation force function to be expressed using coeffic…
Molecular replacement (MR) is the method of choice for X-ray crystallography structure determination when structural homologues are available in the Protein Data Bank (PDB). Although the success rate of MR decreases sharply when the sequence similarity between template and target proteins drops below 35% identical res…
A water-insoluble anti-cancer agent, camptothecin (CPT) was incorporated to a polymeric micelle carrier system forming from poly(ethylene glycol)-poly(aspartate) block copolymers. Incorporation efficiency and stability were analyzed in correlation with chemical structures of the inner core-forming hydrophobic blocks a…
Phase diagram studies of the system SrO‐Fe 3 O 4 ‐MoO 3 were undertaken in Ar/1% H 2 at 1200°C with particular emphasis on the region near Sr 2 FeMoO 6 (SFMO). We find that Sr 2 FeMoO 6 is not a point compound but is part of the Sr 2+ z Fe 2− x Mo x O y solid solution region. The oxygen stoichiometry, y , in Sr 2 Fe 2…