Materials Literature
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Silicon nitrides are synthesized by ion-assisted deposition with only one coating material and a nitrogen-ion-beam source. All the SiN(x) films are amorphous and mechanically strong. A wide range of refractive indices from 3.43 to 1.72 at a wavelength of 1550 nm is obtained. Near-IR antireflection coating and a bandpa…
The electrostatic mirror method developed by Le Gressus can be used to characterize the charge trapping properties of insulators. It is based on the measurements of the dark spot observed on a scanning electron microscope (SEM) screen working in the secondary electron mode when a beam of low energy electrons is used t…
The phase behaviour of 4-n-pentadecyloxy-3-nitrobiphenyl-4-carboxylic acid (ANBC-15) was investigated by differential scanning calorimetry, polarizing optical microscopy, and dynamic viscoelastic measurements. The phase sequence for the virgin sample of ANBC-15 is crystalsmectic C (SmC)-cubic (D)-smectic A (SmA)-'stru…
Si 3 N 4 /20‐vol%‐SiC nanocomposites with Al 2 O 3 and Y 2 O 3 as sintering additives have demonstrated very high strength at room temperature; however, the high‐temperature strength was drastically decreased, because of the low softening temperature of the grain‐boundary phase. To improve the high‐temperature strengt…
Single-wall carbon nanotubes (SWNTs) have been produced for the first time using the high-temperature pulsed arc-discharge technique, which has been developed recently in this laboratory, as reported in the conventional steady arc discharge method. Scanning electron microscopic (SEM) and transmission electron microsco…
Fine particles of chromites (MO . Cr2O3 where M = Mg, Zn, Ni, Co, and Cu) have been prepared by calcination of precursor powders prepared by evaporation of an aqueous solution of polyvinyl alcohol and stoichiometric amounts of the desired metal nitrates in appropriate mole ratios. The calcination temperatures, for the…
PURPOSE: In intravascular brachytherapy, use of high atomic number materials, such as contrast agents and metallic stents, can introduce significant dose perturbations, especially for low energy photons. The purpose of this study is to investigate dose perturbation at the interfaces of high atomic number materials and…
(1999). Thermomechanical Properties of Amorphous Saccharides: Their Role in Enhancing Pharmaceutical Product Stability. Biotechnology and Genetic Engineering Reviews: Vol. 16, No. 1, pp. 281-292.
Abstract Modeling and optimization of C 2 hydrocarbon production via the oxidative coupling of methane (OCM) were studied. The model includes both homogeneous and heterogeneous reactions. Focusing on the use of detailed reaction networks, previously validated experimentally, and the critical role of oxygen in both met…
Abstract Hydrothermal synthesis experiments were conducted to study the transition from smectite to corrensite. A mixture of oxides with the bulk composition of corrensite—Na 0.4 (Si 6.4 Al 1.6 )(Mg 7.8 Al 1.2 )-O 20 (OH) 10 —was sealed in platinum capsules with 29–37 wt. % water. One set of samples was treated in col…
Charged areas of spherulitic polypropylene (PP) samples were visualized by a simple technique of attaching oppositely charged fine dye particles. A combination of this visualization technique and thermally stimulated current (TSC) spectroscopy was applied to identify the regions where shallow and deep charge traps exi…
The spectroscopic and electrochemical properties of a series of dinuclear mixed-valence complexes containing two (triphos)Co units are reported: [(triphos)Co(L)Co(triphos)]+ (L = C6O4X2; × = H, Cl, Br, I, Me: 2a–e+; L = C14H4O4Me2: 4+). Complexes 2a–e+ are bridged by tetraoxybenzene ligands and exhibit very strong met…
Abstract Electron spin polarizations were studied for a system of excited triplet (T1) phthalocyanine (MTNPc; M = H2, Zn) and a nitroxide radical (TEMPO) in toluene solution by means of time-resolved EPR (TREPR) spectroscopy. TREPR spectra of the T1 state and the radical (R) were observed simultaneously. Spin polariza…
Calcium carbonate monohydrate spherulites (∼102 μm diameter) with different magnesium contents were synthesized from artificial seawater. Stable spherulites are only obtained if [Mg]/[Ca] ≥1-1.3 in the mother solution. Spherulites are surrounded by a skin of ∼15 μm thickness, about 5 times richer in Mg2+ than the bulk…
Zinc oxide (ZnO) films were deposited on sapphire (0001) substrates by vapor phase epitaxy using ZnCl 2 as a chloride source. The X-ray diffractogram showed a typical pattern of epitaxially grown ZnO with a hexagonal structure, and a full width at half-maximum (FWHM) of 23.3 min was obtained in the X-ray diffraction p…
The structure and mechanical properties of the injection-molded products for the binary blends composed of an isotactic polypropylene (PP) and a rubbery ethylene-1-hexene copolymer (EHR) were studied. The following two types of blends were employed: one is the incompatible blend of PP and ethylene-rich EHR; the other…
Predictive calculations of the physical properties of fibrous preforms and composite parts require an appropriate description of the preform geometry. Most internal dimensions of a preform are set during its manufacturing through mechanical interactions occurring between the tows and threads. However, the global shape…
Optical characteristics of quartz glass KU-1 were investigated after irradiation in a water-pull nuclear reactor IR-8 up lo the fluence of 6 × 1019n/cm2. Quartz samples - cylinders with diameters 16 mm and heights 8 mm - were placed in two aluminum containers active zone in one of the central channel of the reactor IR…
Abstract Siltstones from the Precambrian Freda Formation in Wisconsin have been studied by scanning, scanning-transmission and analytical electron microscopy (SEM, STEM and AEM), and X-ray diffraction (XRD). XRD data for drill core samples show a change from smectite-rich Illite-Smectite (I-S) in shallow samples to il…
Slow electron transfer to manganese(iii) porphyrins results when the macrocycle deviates from planarity. This was demonstrated by measuring the kinetics of homogeneous electron transfer from a series of semiquinone radical anions to synthetic manganese porphyrins (shown schematically; R1=H, Cl, F; R2=H, F). Three of t…