Materials Literature
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The cyclic fatigue and fracture toughness behavior of reactive hot‐pressed Ti 3 SiC 2 ceramics was examined at temperatures from ambient to 1200°C with the objective of characterizing the high‐temperature mechanisms controlling crack growth. Comparisons were made of two monolithic Ti 3 SiC 2 materials with fine‐ (3–10…
Several fragilarioid diatoms were found in surface sediment samples from Connecticut (U.S.A.) as part of a paleolimnological study on a set of 60 freshwater lakes. Observation of acid-digested material under scanning electron microscopy (SEM) revealed morphological variants of Staurosira and Stauroforma absent or seld…
AISI Type 304 L stainless steel (SS) is a widely used material in industry due to its strength and resistance to corrosion. However, corrosion on SS is reported largely at welds or adjacent areas. Bacteria were observed to colonize preferentially near welds as a result of surface roughness. In the present study, the i…
The photoluminescence properties of MgxZn1−xO alloy thin films fabricated by the sol-gel deposition method were studied. The Mg2+ content in the films was up to 0.36 and they had the ZnO wurtzite structure. The band gap of the films can be controlled between 3.40 and 3.93 eV by adjusting the Mg2+ proportions. Transmit…
Abstract Application of poly(vinyl chloride) (PVC) was first described in a patent in 1913, but only after 1930 did a sustained interest in PVC arise in a number of industrial laboratories. Nowadays PVC is the second thermoplastic resin behind polyolefins with a worldwide capacity of ca. 31 million tons. In its nearly…
The nature of “water” incorporated in natural zircon has been studied by polarized infrared absorption spectroscopy combined with heating and deuteration experiments and Raman, thermogravimetric, chemical, and X-ray analyses, and previously published results have been re-evaluated. Hydroxyl groups are probably the onl…
Abstract The use of solid-laden emulsions (Pickering emulsions) provides an interesting alternative to normal emulsions because the need for organic surfactants is removed or reduced. Combination of a bentonite with a layered double hydroxide represents an effective emulsifying system and provides high stability again…
We study thermoplastic elastomers of triblock copolymers, of the form polystyrene−polyisoprene−polystyrene (SIS), where the microphase-separated PS blocks act as physical cross-links for the PI elastic network. Two compositions are examined: one with micellar cubic and the other with hexagonal cylindrical morphology o…
Transparent p–i–n heterojunction diodes are fabricated using heavily doped, p-type CuYO2 and semi-insulating i-ZnO thin films deposited onto a glass substrate coated with n-type indium tin oxide. Rectification is observed, with a ratio of forward-to-reverse current as high as 60 in the range −4–4 V. The forward-bias c…
BaTiO 3 and Ba(Ti,Zr)O 3 dielectric powders have been prepared from submicrometer BaCO 3 , TiO 2 , and ZrO 2 . By use of submicrometer BaCO 3 the intermediate formation of Ba 2 TiO 4 second phase can be widely suppressed. Monophase perovskites of BaTiO 3 were already formed at 900°C and Ba(Ti,Zr)O 3 at 1050°C. Aggrega…
By measuring the complex dielectric function over 15 decades of frequency, the temperature dependence of the mean relaxation time and of the dielectric strength is evaluated for six low-molecular-weight glass-forming liquids and one polymeric melt. For the first time it could be shown that a universal correlation exis…
We measured in situ the radiation-induced absorption of pure silica core fibers exposed to a fission nuclear reactor. We observed the growth of the 1.39-/spl mu/m. OH vibration band in polymer coated fiber. Three mechanisms are responsible for this effect: recoil protons, hydrogen diffusion, and a probable compaction…
Abstract UV absorption maxima of trimethylsilyl-, trimethylgermyl-, and trimethylstannyl-substituted pyrenes shifted to longer wavelength than that of unsubstituted pyrene. Absorption maxima of mono-, bis-, tris-, and tetrakis(trimethylsilyl)pyrenes shifted to longer wavelength consecutively at intervals of 10 nm. Flu…
The common property of organic and inorganic solids of forming pseudopolymorphs are of very high importance in chemical and pharmaceutical industry. Depending on the solvent some compounds form hydrates (with water) or solvates (with other solvents) in different stoichiometric proportions. Pseudopolymorphs exhibit dif…
A number of studies have appeared recently on the underlying mechanisms of liposome-cell interactions under in vitro conditions, in which isolated cell populations or cell lines were used. However, our knowledge of how liposomes interact with cells and the parameters that influence this in vivo is limited. We will sum…
UreE is proposed to be a metallochaperone that delivers nickel ions to urease during activation of this bacterial virulence factor. Wild-type Klebsiella aerogenes UreE binds approximately six nickel ions per homodimer, whereas H144*UreE (a functional C-terminal truncated variant) was previously reported to bind two. W…
Slurries with different solids loading (34–50 vol%) of alumina were made with egg white (ovalbumin)–water premix. The ovalbumin content in the premix was decreased with increase in solids loading to lower slurry viscosity. The slurries were cast into bulk shapes and heated to 80°C, resulting in denaturation of ovalbum…
Two novel thioantimonate(III) compounds [Co(C6H18N4)]Sb2S4 (1) and [Ni(C6H18N4)]Sb2S4 (2) were synthesised under solvothermal conditions by reacting the transition metal, Sb and S in a 50% solution of tris(2-aminoethyl)amine (tren). The use of a tetradentate amine yields incompletely shielded transition metal cations…
The gradient corrected Perdew-Burke-Ernzerhof density functional in conjunction with a 3-21G basis set and periodic boundary conditions was employed to investigate the geometries and energies of C(2)F fluorinated armchair single wall carbon nanotubes (F-SWNT's) with diameters ranging from 16.4 to 4.2 A [(12,12) to (3,…
Over the past few years, the detection of single N-V centers in diamond has attracted much interest, since it is expected to lead to innovative applications in various domains of quantum information. The N-V center in diamond is a defectconsisting of a substitutional nitrogen atom adjacent to a carbon-atom vacancy. Th…