Materials Literature
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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…
A schematic model is proposed for understanding the boson peak as a consequence of the coupling between slowly decaying density fluctuations and the transverse sound modes that develop in the amorphous solid. The present analysis demonstrates that the nature of the dynamics of defect densities in the disordered system…
Results from the crystalline and microstructure study of the φ′- and δ-AlON spinel phases by X-ray diffraction, neutron diffraction and standard-resolution transmission electron microscopy techniques are reported. Several samples having different compositions in mol % AlN were considered. A structural model is propose…
This paper reports the application of image analysis methods we developed previ ously to characterize fiber diameter distribution in nonwovens using a "distance trans form." The method is verified by a series of simulated nonwoven images as well as some real web images used previously, including a carded web, a relati…
The crystal structure of the yellow pigment 2,5-dihydroxybenzo[ de ]benzo[4,5]imidazo[2,1- a ]isoquinolin-7-one (C 18 H 10 N 2 O 3 ) was determined from powder data. The crystal structure was solved by minimizing the intermolecular energy starting from random packings. Subsequently, the structure was refined by rigid-…
The glass transition temperatures of binary mixtures of polyamines and polyalcohols are investigated by differential scanning calorimetry (DSC). For all systems, the composition dependence of the glass transition temperature T g shows clear maxima, in stark contrast to those of polyalcohol−polyalcohol mixtures reporte…
Studies on fabrication and thermal conductivity of B4C/Cu cermet were made to obtain high performance neutron absorber materials for Liquid Metal-cooled Fast Breeder Reactor (LMFBR). A mixed powder of B4C and Cu was mechanically blended at high speed thereby a coating layer of Cu was formed on the surface of B4C powde…