Materials Literature
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A pulse-height spectroscopic technique is used to measure the linear attenuation coefficients of commercially available composite phantom materials designed to simulate the attenuation characteristics of breast fat and breast glandular tissue. The manufacturers have specified the composition of these materials with th…
The spin-state transition in perovskite ${\mathrm{LaCoO}}_{3}$ has been a controversial topic ever since its discovery. To obtain a better physical understanding of its origin we have studied various magnetically ordered states of an enlarged double cell, including the low-spin state, intermediate-spin state, high-spi…
Ge and GeO2 nanocrystals are prepared in a-SiOx matrix by DC-magnetron sputtering and thermal annealing. An increased infrared absorption at 860 cm−1 is found in films containing GeO2 clusters. Under ultra violet excitation, both types of films luminesce near 3.1 eV, with a characteristic blue PL decay time around 1 n…
Aluminium phthalocyanines sulfonated to a different degree ( AlPcS n ) and consisting of various isomeric species were studied by spectroscopic techniques to determine their tendencies to form dimers and aggregates. These characteristics were compared with the cell-penetrating properties of the species, using the Ehrl…
The work reported in the preceding article in this series is extended by consideration of polysiloxane–ceramic composites based on atactic poly(methylphenylsiloxane) (PMPS) elastomers instead of poly(dimethylsiloxane). The former is noncrystallizable because of its stereochemically irregular structure, while the latte…
The (Sr1−1.5xBix)TiO3 (0.0133⩽x⩽0.133) ceramic system reveals several sets of dielectric permittivity peaks in different temperature ranges. Dielectric permittivity and dielectric loss peaks were detected in the temperature range 500–800 K and in the present article the dielectric polarization behavior is presented an…
Concentration dependences of a complete set of ionic transport properties are reported for the binary solid polymeric ion conductor poly(ethylene‐oxide) [P(EO)], complexed with NaTFSI, [TFSI = (bis)trifluoromethanesulfonate imide, ]. Measured transport properties include the ionic conductivity (σ), the differential sa…
We report magnetic and magnetoresistance (MR) measurements in the current-in-plane (CIP) and current-perpendicular-to-the-plane (CPP) geometries of multilayers and spin-valve structures based on the predicted half-metallic (100% spin-polarized) ferromagnetic Heusler alloy NiMnSb. Multilayers of the form [NiMnSb/Cu]×10…
Optical gaps and electrochromic efficiencies of sputtered tungsten oxide films are studied by focusing attention on the cluster size of the film. The cluster consists of O‐W‐O network with terminal W=O bonds on its boundary. The quantity of W=O bonds increased with the surface area of the clusters. Raman scattering ba…
Polycrystalline copper (I) oxide films were deposited on stainless steel substrate by galvanostatic electrodeposition method and were characterized by X-ray diffraction and scanning electron microscopy. The effect of bath temperature, bath pH and current density on the compositon, grain size, surface texture and surfa…
meso -Tetrakis(5-trimethylammoniopentyl)porphyrin (TMAP) was incorporated in MCM-41 directly during a hydrothermal synthesis or by a surfactant ↔ porphyrin ion-exchange reaction with as-synthesized MCM-41. Both methods permitted encapsulation of the porphyrin within the mesoporous channel system. UV−vis absorption spe…
Novel polymer electrolytes based on network polymers with free chain ends have been prepared, and the effects of the free chain ends on the thermal and mechanical properties, the ionic conductivity, and the charge‐transfer resistance at the lithium electrode interface have been explored in detail. Terminal hydroxyl gr…
This paper presents a detailed theoretical treatment of the partial oxidation of methane to syngas (OMS) on transition and coinage metal (M) catalysts (M = Ni, Pd, Pt, Cu). The adsorption energies for a number of intermediates in the dissociation of methane on the metals were calculated using medium sized cluster mode…
Investigations of perovskite‐type BaCeO 3 and SrCeO 3 with various dopants (Y, Gd, Nd, and Ni) indicate that their microstructures and electrical properties are strongly influenced by the type and amount of dopants. Grain growth and densification of sintered samples are influenced by dopant level and A:B site nonstoic…
We report on a detailed study of the phase transformation previously proposed as the origin of the second low voltage plateau, occasionally observed during the discharge of Ni‐based alkaline batteries. This was done by means of intermittent galvanostatic as well as low rate potentiodynamic techniques coupled with X‐ra…
The influence of pH and the concentration of hydrogen sulfide (H2S) on corrosion of iron in acid solutions was studied using a potentiostatic polarization method. The alternating current (AC) impedance technique also was used to characterize the active dissolution process of iron. Results showed the dissolution proces…
Surface-enhanced Raman spectroscopy (SERS) is a very sensitive technique which has been extensively employed in the study of a wide range of molecules, but an accurate interpretation of SER spectra is sometimes missing. Bands which do not correspond to the molecule under study and that can be attributed to other molec…
The fabrication of polymer/Cu2S nanoparticle hybrid films is described, in which metal–ligand interactions are used to self-organize Cu2+-neutralized polyelectrolytes and pyridine-containing polymers into alternately deposited multilayers, as illustrated in the Figure, where the circles represent the copper salt and t…
Combinations of various carbon and nitrogen substrates were used to study poly-β-hydroxybutyrate accumulation and H2 evolution by Rhodobacter sphaeroides strain RV. The cells evolved hydrogen on lactate, pyruvate, or succinate under nitrogen-deprived conditions and on lactate-glutamate and pyruvate-glutamate media. Po…
Vibrational spectrum analysis was used to study the cation arrangement in the complex perovskites. The transition from the ideal perovskite structure ABO3 to complex compositions with a pair of the A or B cations, such as A1/2′A1/2″BO3 or AB1/2′B1/2″O3, leads to drastic changes in the Raman spectra. Correlation betwee…