Materials Literature
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Much effort has been expended in the past few decades in the attempt to link the degradation of materials exposed to the atmosphere to the causative agents responsible for the degradation. The utility in doing so is primarily to understand the cause and effect relationships involved in the atmospheric corrosion proces…
The risk of decompression sickness (DCS) was modulated by varying the biochemical activity used to eliminate some of the hydrogen (H(2)) stored in the tissues of pigs (19.4 +/- 0.2 kg) during hyperbaric exposures to H(2). Treated pigs (n = 16) received intestinal injections of Methanobrevibacter smithii, a microbe tha…
The crystal structure of xilingolite, ideally Pb3Bi2S6, space group C 2/ m , Z = 4, a 13.511(3), b 4.0850(11), c 20.649(2) A, β 92.15(2)°, was solved and refined from single-crystal X-ray data collected on (001) twinned crystals ( R 1 = 8.65% for 1520 reflections with I > 2σI). Xilingolite is a 4,4 L homologue of the…
The thermal and kinetic aspects of solid state decomposition reactions can be complex and posses a large number of parameters to investigate. The determination of the activation energies for the several intermediates in the thermal decomposition is particularly sensitive to the overlap in thermal decomposition traces.…
The Green’s function technique was used to determine the isothermal transient ionic current (ITIC) caused by the application of a constant potential across an ion conductor which initially contained the ions under consideration. The analysis included migration, diffusion, and space-charge effects as contributions to t…
The infrared emission spectra of hydrothermally synthesized saponites have been compared to those of naturally occurring saponites. The spectra are very similar and only very minor differences are observed in the band positions and intensities. The OH-stretching region reveals for only the synthetic saponite a small b…
The solute–vacancy interaction energy in α-Ti is investigated systematically by making a supercell total energy calculation using the linear muffin-tin orbital within the atomic sphere approximation. The solutes studied cover most of the elements from the third to the fifth row in the periodic table. The results show…
Using the glancing angle deposition (GLAD) technique, we have fabricated porous, chiral thin films with optically anisotropic helical microstructures that exhibit optical phenomena such as wavelength specific rotation of linearly polarized light. Initial research has shown that the porosity of the films allows for the…
Abstract SWy-2 (Wyoming), Sap-Ca saponite (California) and SAz-1 (Cheto, Arizona) were exchanged with different cations (Al, Ni, Mg, Ca and Na). The catalytic activity of these ionexchanged clays was measured directly using the isomerization of α-pinene at 80 ° C for 2 h to yield camphene, limonene and other minor pro…
Abstract Two distinct assemblages of authigenic phyllosilicates were distinguished in the Kremikovtsi sedimentary exhalative (SEDEX) siderite iron formation (SIF) and noted as important tracers of two styles of mineralization characteristic of this type of ore deposit. Hydrothermal-sedimentary layer silicates are repr…
The surface tension of atactic polystyrene (PS), isotactic poly(propylene) (PP) and PS/PP-blends, and additionally the interfacial tension between PP/PS have been measured in the temperature range between 200 and 280°C using the pendant drop method. Within the temperature range studied, the surface tension decreased l…
Abstract The crystal structures of twelve different DL-malates have been determined and refined from single-crystal X-ray diffraction data. In addition, powder diffrac-tion data were used for the refinement of the lattice pa-rameters. The title compounds are the neutral DL-malates Li 2 (C 4 H 4 O 5 )·2H 2 O (space gro…
We report on the synthesis of monodispersed individual silica−titanyl sulfate (SiO 2 −TS) spheres with the dimensions varying from 350 to 900 nm. An important factor leading to complete and uniform coating of SiO 2 spheres with a ca. 40 nm thick layer of TS is the ratio, φ, between the amount of TS added to the silica…
A new synthetic method for 2,7,12,17-tetraphenylporphycene (2e, TPPo) which avoids tetradecarboxylation by sublimation of the intermediate tetracarboxylic acid 8 is reported. Thus, the use of a pyrrol 13a bearing two orthogonal ester groups allows the synthesis of bipyrrol 12a, from which the benzyl ester groups are s…
Expansion and contraction in regioregular and regiorandom poly(3-alkylthiophene), PAT films (alkyl=hexyl and dodecyl) upon electrochemical oxidation and reduction in organic electrolyte solvents are studied. It is found that the deformed films consist of two components, which respond to electrochemical cycle and creep…
A series of polyhydrazides and poly(amide hydrazide)s bearing ether and cardo groups were prepared from three bis(ether carboxylic acid)s, 1,1-bis[4-(4-carboxyphenoxy)phenyl]cyclohexane, 5,5-bis[4-(4-carboxyphenoxy)phenyl]-4,7-methanohexahydroindan and 9,9-bis[4-(4-carboxyphenoxy)phenyl]fluorene, or their diacyl chlor…
In solution, the growth rate and the crystal habit are influenced by a number of factors such as supersaturation, temperature, pH of the solution, cooling rate, agitation, viscosity, initial state of the seed crystal and the presence of impurities. The crystallization of orthorhombic β-MgSO4 · 7H2O, from low temperatu…
A trefoil-shaped liquid crystal containing an aromatic hetero-nucleus has been synthesized by the reaction of cyanuric chloride with 3,6-didecanoyl carbazole (DDC). The molecular structure was characterized by 1H NMR and 13C NMR spectroscopy, mass spectroscopy and elemental analysis. The core consists of 1,3,5-triazin…
Thermoset polyimides were prepared by thermally curing B-staged endcapped polyimide resins that were obtained by thermally baking PMR polyimide matrix resins. The polyimide matrix resins were prepared by incorporating flexible ether-bridged aromatic segments [–Ar–O–Ar–] into PMR polyimide backbone to improve their pro…
This study is performed to determine the characteristics of fabric sounds and the mechanical properties to predict their auditory comfort. In order to obtain quantitative information about emotional changes evoked by fabric sounds, physiological signals are acquired and analyzed when each fabric sound is presented to…