Materials Literature
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The hydrothermal reaction of a mixture of V2O5, 1,2,4-triazole (trz), Cu(NO3)2·2.5H2O and H2O yields [{Cu3(trz)2}V4O12], a material constructed from one-dimensional {V4O12}n4n– chains linked to undulating {Cu3(trz)2}n4n+ networks.
Controlled procedures for the covalent anchoring of iron tetrasulfophthalocyanine onto amino-modified silicas have been developed to fix the complex either in a monomer or dimer form. Usually considered as a catalytically inert form, dimeric µ-oxo iron tetrasulfophthalocyanine grafted onto amino-modified silica or MCM…
Double hydroxides of the formula, having the same structure as that of α‐nickel hydroxide have been synthesized by partial substitution of zinc for nickel. The hydroxide having the composition x = 0.25 exhibits prolonged stability in 6 M KOH. Pasted electrodes comprising this material are rechargeable with a stabilize…
Domains in the low-temperature, ferrimagnetic, and ferroelectric, phase of magnetite ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ were investigated in the bulk, via their ferroelastic distortion, by means of synchrotron radiation x-ray topography, complemented by Nomarski optical microscopy on the surface. After cooling throug…
Sample controlled thermal analysis (SCTA) has been used to carefully and reproducibly eliminate the organic surfactant template from pure silica mesoporous MCM-41. The reproducibility allowed a number of intermediate species to be isolated permitting complementary measurements. To understand the mechanisms by which th…
The aristotype and the two ettotypes of the complex perovskite PbFe 0.5 Nb 0.5 O 3 have been refined by the Rietveld method from neutron and x-ray powder diffraction data. To avoid errors due to sample off-stoichiometry or inhomogeneity, only powders obtained by grinding single crystals were analysed. At 523 K the cub…
One of the primary differences among various test methods used to evaluate fabrics for thermal protective clothing is the presence or absence of a horizontal air gap between the fabric to be tested and the test sensor. Numerical modeling and flow visualization experiments were used to study the effect of the size of t…
The dc space-charge model, previously developed by the authors, here is modified to account for the contribution to electrical degradation provided by ac fields. First, the dc model is applied to both dc and ac multistress life test results relevant to a given material. The variations of model parameters from dc to ac…
The perovskite-type compounds Sr 2 LnRuO 6 (Ln = Eu-Lu) have been synthesized, and their crystal structures and magnetic properties have been investigated. Powder x-ray diffraction measurements and the Rietveld analysis show that they are monoclinic with space group P 2 1 / n and that Ln 3+ and Ru 5+ ions are structur…
The absolute fluorescent quantum efficiencies of NBS phosphor standard samples which were excited by a 254nm radiation were measured by a polychromator. The polychromator was calibrated by a conical cavity thermal radiation detector, which used polyvinylidene fluoride (PVDF) films, coated inside with gold black absorb…
The Mechanics-Materials Linkage (M. Meyers, et al.) Essentials to Solid Mechanics (J. Willis) Foundations of Solids Mechanics (J. Rice) Elastic Anisotropy (D. Barnett) Structure Property Relations: Impact of Electron Microscopy (G. Thomas) Nature of Elastic Stiffness and Plastic Strength (J. Gilman) Rate Processes in…
Surface topography appears to be an important but often neglected factor in implant performance. In this study, fibroblasts were cultured on a range of porous polycarbonate (PC) membranes with well defined surface topography (track-etched micropores, 0.2-8.0 microm in diameter) and wettability gradients. The wettabili…
The origin of the second, faster relaxation process in Mn12 molecules has been identified as a different relative orientation of the Jahn–Teller elongation axes of the MnIII ions, which we have termed ‘Jahn–Teller isomerism’.
The Methanococcus jannaschii gene MJ1392 was cloned, and its protein product was hyperexpressed in Escherichia coli. The resulting protein was purified and shown to catalyze the condensation of pyruvate and acetyl coenzyme A, with the formation of (R)-citramalate. Thus, this gene (cimA) encodes an (R)-citramalate synt…
The magnetic phase diagram of ${\mathrm{La}}_{1\ensuremath{-}\ensuremath{\delta}}{\mathrm{MnO}}_{3}$ powdered samples has been studied as a function of $\ensuremath{\delta}$ in the low doping range $(\ensuremath{\delta}<0.1).{\mathrm{La}}_{0.97}{\mathrm{MnO}}_{3}$ has a canted magnetic structure at low temperature…
The polarization behaviors of porous platinum and , (LSM) cathodes with zirconia electrolytes with various ionic conductivities were investigated. The exchange current density, , on Pt cathode was not infuenced by the at 900 and 1000°C, whereas increased proportionally to at a lower temperature of 800°C. However, the…
A bis-terpyridine complex of iridium(III) incorporating a pendent pyridyl group displays long-lived emission at pH 7 in air-equilibrated aqueous solution, but both the lifetime and intensity are reduced by a factor of >8 upon protonation of the pyridyl nitrogen; structurally similar complexes with pendent phenolic gro…
The mechanism of interaction between subcellular pigment microparticles and short pulse laser radiation was investigated with nanosecond time-resolved microscopy and fluorescence microscopy. Stroboscopic illumination was used to capture images of transient events induced in cells by laser pulses. Fluorescence microsco…
Several attempts have been made to compatibilize immiscible blends by introducing suitably-chosen polymer additives. This work studies the EPDM elastomer, chemically modified with maleic anhydride (MA), through reaction in solution of EPDM and MA, using dibenzoyl peroxide as an initiator. The best conditions for obtai…
Transmission electron microscopy is used to determine the microstructures of a Ti-50.8 at% Ni alloy given different aging treatments. Two different peak-aging treatments are shown to result in disk shaped semi-coherent Ti3Ni4 precipitates with a diameter ranging from 50 nm to 200 nm depending on the aging temperature.…